xref: /linux/drivers/gpu/drm/i915/display/intel_cdclk.c (revision 546b928da0427b0d6c663cbb992bd7bfa9ac7971)

/*
 * Copyright © 2006-2017 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include <linux/debugfs.h>
#include <linux/iopoll.h>
#include <linux/time.h>

#include <drm/drm_fixed.h>
#include <drm/drm_print.h>
#include <drm/intel/intel_pcode_regs.h>
#include <drm/intel/pci_config.h>
#include <drm/intel/step.h>

#include "hsw_ips.h"
#include "intel_atomic.h"
#include "intel_audio.h"
#include "intel_cdclk.h"
#include "intel_crtc.h"
#include "intel_dbuf_bw.h"
#include "intel_de.h"
#include "intel_display_regs.h"
#include "intel_display_types.h"
#include "intel_display_utils.h"
#include "intel_display_wa.h"
#include "intel_dram.h"
#include "intel_mchbar.h"
#include "intel_parent.h"
#include "intel_plane.h"
#include "intel_psr.h"
#include "intel_vdsc.h"
#include "skl_watermark.h"
#include "skl_watermark_regs.h"
#include "vlv_clock.h"
#include "vlv_dsi.h"
#include "vlv_sideband.h"

/**
 * DOC: CDCLK / RAWCLK
 *
 * The display engine uses several different clocks to do its work. There
 * are two main clocks involved that aren't directly related to the actual
 * pixel clock or any symbol/bit clock of the actual output port. These
 * are the core display clock (CDCLK) and RAWCLK.
 *
 * CDCLK clocks most of the display pipe logic, and thus its frequency
 * must be high enough to support the rate at which pixels are flowing
 * through the pipes. Downscaling must also be accounted as that increases
 * the effective pixel rate.
 *
 * On several platforms the CDCLK frequency can be changed dynamically
 * to minimize power consumption for a given display configuration.
 * Typically changes to the CDCLK frequency require all the display pipes
 * to be shut down while the frequency is being changed.
 *
 * On SKL+ the DMC will toggle the CDCLK off/on during DC5/6 entry/exit.
 * DMC will not change the active CDCLK frequency however, so that part
 * will still be performed by the driver directly.
 *
 * There are multiple components involved in the generation of the CDCLK
 * frequency:
 *
 * - We have the CDCLK PLL, which generates an output clock based on a
 *   reference clock and a ratio parameter.
 * - The CD2X Divider, which divides the output of the PLL based on a
 *   divisor selected from a set of pre-defined choices.
 * - The CD2X Squasher, which further divides the output based on a
 *   waveform represented as a sequence of bits where each zero
 *   "squashes out" a clock cycle.
 * - And, finally, a fixed divider that divides the output frequency by 2.
 *
 * As such, the resulting CDCLK frequency can be calculated with the
 * following formula:
 *
 *     cdclk = vco / cd2x_div / (sq_len / sq_div) / 2
 *
 * , where vco is the frequency generated by the PLL; cd2x_div
 * represents the CD2X Divider; sq_len and sq_div are the bit length
 * and the number of high bits for the CD2X Squasher waveform, respectively;
 * and 2 represents the fixed divider.
 *
 * Note that some older platforms do not contain the CD2X Divider
 * and/or CD2X Squasher, in which case we can ignore their respective
 * factors in the formula above.
 *
 * Several methods exist to change the CDCLK frequency, which ones are
 * supported depends on the platform:
 *
 * - Full PLL disable + re-enable with new VCO frequency. Pipes must be inactive.
 * - CD2X divider update. Single pipe can be active as the divider update
 *   can be synchronized with the pipe's start of vblank.
 * - Crawl the PLL smoothly to the new VCO frequency. Pipes can be active.
 * - Squash waveform update. Pipes can be active.
 * - Crawl and squash can also be done back to back. Pipes can be active.
 *
 * RAWCLK is a fixed frequency clock, often used by various auxiliary
 * blocks such as AUX CH or backlight PWM. Hence the only thing we
 * really need to know about RAWCLK is its frequency so that various
 * dividers can be programmed correctly.
 */

struct intel_cdclk_state {
	struct intel_global_state base;

	/*
	 * Logical configuration of cdclk (used for all scaling,
	 * watermark, etc. calculations and checks). This is
	 * computed as if all enabled crtcs were active.
	 */
	struct intel_cdclk_config logical;

	/*
	 * Actual configuration of cdclk, can be different from the
	 * logical configuration only when all crtc's are DPMS off.
	 */
	struct intel_cdclk_config actual;

	/* minimum acceptable cdclk to satisfy DBUF bandwidth requirements */
	int dbuf_bw_min_cdclk;
	/* minimum acceptable cdclk for each pipe */
	int min_cdclk[I915_MAX_PIPES];
	/* minimum acceptable voltage level for each pipe */
	u8 min_voltage_level[I915_MAX_PIPES];

	/* pipe to which cd2x update is synchronized */
	enum pipe pipe;

	/* forced minimum cdclk for glk+ audio w/a */
	int force_min_cdclk;

	/* bitmask of enabled pipes */
	u8 enabled_pipes;

	/* bitmask of active pipes */
	u8 active_pipes;

	/* update cdclk with pipes disabled */
	bool disable_pipes;
};

struct intel_cdclk_funcs {
	void (*get_cdclk)(struct intel_display *display,
			  struct intel_cdclk_config *cdclk_config);
	void (*set_cdclk)(struct intel_display *display,
			  const struct intel_cdclk_config *cdclk_config,
			  enum pipe pipe);
	int (*modeset_calc_cdclk)(struct intel_atomic_state *state);
	u8 (*calc_voltage_level)(int cdclk);
};

void intel_cdclk_get_cdclk(struct intel_display *display,
			   struct intel_cdclk_config *cdclk_config)
{
	display->cdclk.funcs->get_cdclk(display, cdclk_config);
}

static void intel_cdclk_set_cdclk(struct intel_display *display,
				  const struct intel_cdclk_config *cdclk_config,
				  enum pipe pipe)
{
	display->cdclk.funcs->set_cdclk(display, cdclk_config, pipe);
}

static int intel_cdclk_modeset_calc_cdclk(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);

	return display->cdclk.funcs->modeset_calc_cdclk(state);
}

static u8 intel_cdclk_calc_voltage_level(struct intel_display *display,
					 int cdclk)
{
	return display->cdclk.funcs->calc_voltage_level(cdclk);
}

static void fixed_133mhz_get_cdclk(struct intel_display *display,
				   struct intel_cdclk_config *cdclk_config)
{
	cdclk_config->cdclk = 133333;
}

static void fixed_200mhz_get_cdclk(struct intel_display *display,
				   struct intel_cdclk_config *cdclk_config)
{
	cdclk_config->cdclk = 200000;
}

static void fixed_266mhz_get_cdclk(struct intel_display *display,
				   struct intel_cdclk_config *cdclk_config)
{
	cdclk_config->cdclk = 266667;
}

static void fixed_333mhz_get_cdclk(struct intel_display *display,
				   struct intel_cdclk_config *cdclk_config)
{
	cdclk_config->cdclk = 333333;
}

static void fixed_400mhz_get_cdclk(struct intel_display *display,
				   struct intel_cdclk_config *cdclk_config)
{
	cdclk_config->cdclk = 400000;
}

static void fixed_450mhz_get_cdclk(struct intel_display *display,
				   struct intel_cdclk_config *cdclk_config)
{
	cdclk_config->cdclk = 450000;
}

static void i85x_get_cdclk(struct intel_display *display,
			   struct intel_cdclk_config *cdclk_config)
{
	struct pci_dev *pdev = to_pci_dev(display->drm->dev);
	u16 hpllcc = 0;

	/*
	 * 852GM/852GMV only supports 133 MHz and the HPLLCC
	 * encoding is different :(
	 * FIXME is this the right way to detect 852GM/852GMV?
	 */
	if (pdev->revision == 0x1) {
		cdclk_config->cdclk = 133333;
		return;
	}

	pci_bus_read_config_word(pdev->bus,
				 PCI_DEVFN(0, 3), HPLLCC, &hpllcc);

	/* Assume that the hardware is in the high speed state.  This
	 * should be the default.
	 */
	switch (hpllcc & GC_CLOCK_CONTROL_MASK) {
	case GC_CLOCK_133_200:
	case GC_CLOCK_133_200_2:
	case GC_CLOCK_100_200:
		cdclk_config->cdclk = 200000;
		break;
	case GC_CLOCK_166_250:
		cdclk_config->cdclk = 250000;
		break;
	case GC_CLOCK_100_133:
		cdclk_config->cdclk = 133333;
		break;
	case GC_CLOCK_133_266:
	case GC_CLOCK_133_266_2:
	case GC_CLOCK_166_266:
		cdclk_config->cdclk = 266667;
		break;
	}
}

static void i915gm_get_cdclk(struct intel_display *display,
			     struct intel_cdclk_config *cdclk_config)
{
	struct pci_dev *pdev = to_pci_dev(display->drm->dev);
	u16 gcfgc = 0;

	pci_read_config_word(pdev, GCFGC, &gcfgc);

	if (gcfgc & GC_LOW_FREQUENCY_ENABLE) {
		cdclk_config->cdclk = 133333;
		return;
	}

	switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
	case GC_DISPLAY_CLOCK_333_320_MHZ:
		cdclk_config->cdclk = 333333;
		break;
	default:
	case GC_DISPLAY_CLOCK_190_200_MHZ:
		cdclk_config->cdclk = 190000;
		break;
	}
}

static void i945gm_get_cdclk(struct intel_display *display,
			     struct intel_cdclk_config *cdclk_config)
{
	struct pci_dev *pdev = to_pci_dev(display->drm->dev);
	u16 gcfgc = 0;

	pci_read_config_word(pdev, GCFGC, &gcfgc);

	if (gcfgc & GC_LOW_FREQUENCY_ENABLE) {
		cdclk_config->cdclk = 133333;
		return;
	}

	switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
	case GC_DISPLAY_CLOCK_333_320_MHZ:
		cdclk_config->cdclk = 320000;
		break;
	default:
	case GC_DISPLAY_CLOCK_190_200_MHZ:
		cdclk_config->cdclk = 200000;
		break;
	}
}

static unsigned int intel_hpll_vco(struct intel_display *display)
{
	static const unsigned int blb_vco[8] = {
		[0] = 3200000,
		[1] = 4000000,
		[2] = 5333333,
		[3] = 4800000,
		[4] = 6400000,
	};
	static const unsigned int pnv_vco[8] = {
		[0] = 3200000,
		[1] = 4000000,
		[2] = 5333333,
		[3] = 4800000,
		[4] = 2666667,
	};
	static const unsigned int cl_vco[8] = {
		[0] = 3200000,
		[1] = 4000000,
		[2] = 5333333,
		[3] = 6400000,
		[4] = 3333333,
		[5] = 3566667,
		[6] = 4266667,
	};
	static const unsigned int elk_vco[8] = {
		[0] = 3200000,
		[1] = 4000000,
		[2] = 5333333,
		[3] = 4800000,
	};
	static const unsigned int ctg_vco[8] = {
		[0] = 3200000,
		[1] = 4000000,
		[2] = 5333333,
		[3] = 6400000,
		[4] = 2666667,
		[5] = 4266667,
	};
	const unsigned int *vco_table;
	unsigned int vco;
	u8 tmp = 0;

	/* FIXME other chipsets? */
	if (display->platform.gm45)
		vco_table = ctg_vco;
	else if (display->platform.g45)
		vco_table = elk_vco;
	else if (display->platform.i965gm)
		vco_table = cl_vco;
	else if (display->platform.pineview)
		vco_table = pnv_vco;
	else if (display->platform.g33)
		vco_table = blb_vco;
	else
		return 0;

	tmp = intel_mchbar_read(display, display->platform.pineview ||
				display->platform.mobile ? HPLLVCO_MOBILE : HPLLVCO);

	vco = vco_table[tmp & 0x7];
	if (vco == 0)
		drm_err(display->drm, "Bad HPLL VCO (HPLLVCO=0x%02x)\n",
			tmp);
	else
		drm_dbg_kms(display->drm, "HPLL VCO %u kHz\n", vco);

	return vco;
}

static void g33_get_cdclk(struct intel_display *display,
			  struct intel_cdclk_config *cdclk_config)
{
	struct pci_dev *pdev = to_pci_dev(display->drm->dev);
	static const u8 div_3200[] = { 12, 10,  8,  7, 5, 16 };
	static const u8 div_4000[] = { 14, 12, 10,  8, 6, 20 };
	static const u8 div_4800[] = { 20, 14, 12, 10, 8, 24 };
	static const u8 div_5333[] = { 20, 16, 12, 12, 8, 28 };
	const u8 *div_table;
	unsigned int cdclk_sel;
	u16 tmp = 0;

	cdclk_config->vco = intel_hpll_vco(display);

	pci_read_config_word(pdev, GCFGC, &tmp);

	cdclk_sel = (tmp >> 4) & 0x7;

	if (cdclk_sel >= ARRAY_SIZE(div_3200))
		goto fail;

	switch (cdclk_config->vco) {
	case 3200000:
		div_table = div_3200;
		break;
	case 4000000:
		div_table = div_4000;
		break;
	case 4800000:
		div_table = div_4800;
		break;
	case 5333333:
		div_table = div_5333;
		break;
	default:
		goto fail;
	}

	cdclk_config->cdclk = DIV_ROUND_CLOSEST(cdclk_config->vco,
						div_table[cdclk_sel]);
	return;

fail:
	drm_err(display->drm,
		"Unable to determine CDCLK. HPLL VCO=%u kHz, CFGC=0x%08x\n",
		cdclk_config->vco, tmp);
	cdclk_config->cdclk = 190476;
}

static void pnv_get_cdclk(struct intel_display *display,
			  struct intel_cdclk_config *cdclk_config)
{
	struct pci_dev *pdev = to_pci_dev(display->drm->dev);
	u16 gcfgc = 0;

	pci_read_config_word(pdev, GCFGC, &gcfgc);

	switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
	case GC_DISPLAY_CLOCK_267_MHZ_PNV:
		cdclk_config->cdclk = 266667;
		break;
	case GC_DISPLAY_CLOCK_333_MHZ_PNV:
		cdclk_config->cdclk = 333333;
		break;
	case GC_DISPLAY_CLOCK_444_MHZ_PNV:
		cdclk_config->cdclk = 444444;
		break;
	case GC_DISPLAY_CLOCK_200_MHZ_PNV:
		cdclk_config->cdclk = 200000;
		break;
	default:
		drm_err(display->drm,
			"Unknown pnv display core clock 0x%04x\n", gcfgc);
		fallthrough;
	case GC_DISPLAY_CLOCK_133_MHZ_PNV:
		cdclk_config->cdclk = 133333;
		break;
	case GC_DISPLAY_CLOCK_167_MHZ_PNV:
		cdclk_config->cdclk = 166667;
		break;
	}
}

static void i965gm_get_cdclk(struct intel_display *display,
			     struct intel_cdclk_config *cdclk_config)
{
	struct pci_dev *pdev = to_pci_dev(display->drm->dev);
	static const u8 div_3200[] = { 16, 10,  8 };
	static const u8 div_4000[] = { 20, 12, 10 };
	static const u8 div_5333[] = { 24, 16, 14 };
	const u8 *div_table;
	unsigned int cdclk_sel;
	u16 tmp = 0;

	cdclk_config->vco = intel_hpll_vco(display);

	pci_read_config_word(pdev, GCFGC, &tmp);

	cdclk_sel = ((tmp >> 8) & 0x1f) - 1;

	if (cdclk_sel >= ARRAY_SIZE(div_3200))
		goto fail;

	switch (cdclk_config->vco) {
	case 3200000:
		div_table = div_3200;
		break;
	case 4000000:
		div_table = div_4000;
		break;
	case 5333333:
		div_table = div_5333;
		break;
	default:
		goto fail;
	}

	cdclk_config->cdclk = DIV_ROUND_CLOSEST(cdclk_config->vco,
						div_table[cdclk_sel]);
	return;

fail:
	drm_err(display->drm,
		"Unable to determine CDCLK. HPLL VCO=%u kHz, CFGC=0x%04x\n",
		cdclk_config->vco, tmp);
	cdclk_config->cdclk = 200000;
}

static void gm45_get_cdclk(struct intel_display *display,
			   struct intel_cdclk_config *cdclk_config)
{
	struct pci_dev *pdev = to_pci_dev(display->drm->dev);
	unsigned int cdclk_sel;
	u16 tmp = 0;

	cdclk_config->vco = intel_hpll_vco(display);

	pci_read_config_word(pdev, GCFGC, &tmp);

	cdclk_sel = (tmp >> 12) & 0x1;

	switch (cdclk_config->vco) {
	case 2666667:
	case 4000000:
	case 5333333:
		cdclk_config->cdclk = cdclk_sel ? 333333 : 222222;
		break;
	case 3200000:
		cdclk_config->cdclk = cdclk_sel ? 320000 : 228571;
		break;
	default:
		drm_err(display->drm,
			"Unable to determine CDCLK. HPLL VCO=%u, CFGC=0x%04x\n",
			cdclk_config->vco, tmp);
		cdclk_config->cdclk = 222222;
		break;
	}
}

static void hsw_get_cdclk(struct intel_display *display,
			  struct intel_cdclk_config *cdclk_config)
{
	u32 lcpll = intel_de_read(display, LCPLL_CTL);
	u32 freq = lcpll & LCPLL_CLK_FREQ_MASK;

	if (lcpll & LCPLL_CD_SOURCE_FCLK)
		cdclk_config->cdclk = 800000;
	else if (intel_de_read(display, FUSE_STRAP) & HSW_CDCLK_LIMIT)
		cdclk_config->cdclk = 450000;
	else if (freq == LCPLL_CLK_FREQ_450)
		cdclk_config->cdclk = 450000;
	else if (display->platform.haswell_ult)
		cdclk_config->cdclk = 337500;
	else
		cdclk_config->cdclk = 540000;
}

static int vlv_calc_cdclk(struct intel_display *display, int min_cdclk)
{
	int freq_320 = (vlv_clock_get_hpll_vco(display->drm) <<  1) % 320000 != 0 ?
		333333 : 320000;

	/*
	 * We seem to get an unstable or solid color picture at 200MHz.
	 * Not sure what's wrong. For now use 200MHz only when all pipes
	 * are off.
	 */
	if (display->platform.valleyview && min_cdclk > freq_320)
		return 400000;
	else if (min_cdclk > 266667)
		return freq_320;
	else if (min_cdclk > 0)
		return 266667;
	else
		return 200000;
}

static u8 vlv_calc_voltage_level(struct intel_display *display, int cdclk)
{
	if (display->platform.valleyview) {
		if (cdclk >= 320000) /* jump to highest voltage for 400MHz too */
			return 2;
		else if (cdclk >= 266667)
			return 1;
		else
			return 0;
	} else {
		/*
		 * Specs are full of misinformation, but testing on actual
		 * hardware has shown that we just need to write the desired
		 * CCK divider into the Punit register.
		 */
		return DIV_ROUND_CLOSEST(vlv_clock_get_hpll_vco(display->drm) << 1, cdclk) - 1;
	}
}

static void vlv_get_cdclk(struct intel_display *display,
			  struct intel_cdclk_config *cdclk_config)
{
	u32 val;

	cdclk_config->vco = vlv_clock_get_hpll_vco(display->drm);
	cdclk_config->cdclk = vlv_clock_get_cdclk(display->drm);

	vlv_punit_get(display);
	val = vlv_punit_read(display, PUNIT_REG_DSPSSPM);
	vlv_punit_put(display);

	if (display->platform.valleyview)
		cdclk_config->voltage_level = (val & DSPFREQGUAR_MASK) >>
			DSPFREQGUAR_SHIFT;
	else
		cdclk_config->voltage_level = (val & DSPFREQGUAR_MASK_CHV) >>
			DSPFREQGUAR_SHIFT_CHV;
}

static void vlv_program_pfi_credits(struct intel_display *display)
{
	unsigned int credits, default_credits;

	if (display->platform.cherryview)
		default_credits = PFI_CREDIT(12);
	else
		default_credits = PFI_CREDIT(8);

	if (display->cdclk.hw.cdclk >= vlv_clock_get_czclk(display->drm)) {
		/* CHV suggested value is 31 or 63 */
		if (display->platform.cherryview)
			credits = PFI_CREDIT_63;
		else
			credits = PFI_CREDIT(15);
	} else {
		credits = default_credits;
	}

	/*
	 * WA - write default credits before re-programming
	 * FIXME: should we also set the resend bit here?
	 */
	intel_de_write(display, GCI_CONTROL,
		       VGA_FAST_MODE_DISABLE | default_credits);

	intel_de_write(display, GCI_CONTROL,
		       VGA_FAST_MODE_DISABLE | credits | PFI_CREDIT_RESEND);

	/*
	 * FIXME is this guaranteed to clear
	 * immediately or should we poll for it?
	 */
	drm_WARN_ON(display->drm,
		    intel_de_read(display, GCI_CONTROL) & PFI_CREDIT_RESEND);
}

static void vlv_set_cdclk(struct intel_display *display,
			  const struct intel_cdclk_config *cdclk_config,
			  enum pipe pipe)
{
	int cdclk = cdclk_config->cdclk;
	u32 val, cmd = cdclk_config->voltage_level;
	struct ref_tracker *wakeref;
	int ret;

	switch (cdclk) {
	case 400000:
	case 333333:
	case 320000:
	case 266667:
	case 200000:
		break;
	default:
		MISSING_CASE(cdclk);
		return;
	}

	/* There are cases where we can end up here with power domains
	 * off and a CDCLK frequency other than the minimum, like when
	 * issuing a modeset without actually changing any display after
	 * a system suspend.  So grab the display core domain, which covers
	 * the HW blocks needed for the following programming.
	 */
	wakeref = intel_display_power_get(display, POWER_DOMAIN_DISPLAY_CORE);

	intel_parent_vlv_iosf_get(display,
				  BIT(VLV_IOSF_SB_CCK) |
				  BIT(VLV_IOSF_SB_BUNIT) |
				  BIT(VLV_IOSF_SB_PUNIT));

	val = vlv_punit_read(display, PUNIT_REG_DSPSSPM);
	val &= ~DSPFREQGUAR_MASK;
	val |= (cmd << DSPFREQGUAR_SHIFT);
	vlv_punit_write(display, PUNIT_REG_DSPSSPM, val);

	ret = poll_timeout_us(val = vlv_punit_read(display, PUNIT_REG_DSPSSPM),
			      (val & DSPFREQSTAT_MASK) == (cmd << DSPFREQSTAT_SHIFT),
			      500, 50 * 1000, false);
	if (ret)
		drm_err(display->drm, "timed out waiting for CDCLK change\n");

	if (cdclk == 400000) {
		u32 divider;

		divider = DIV_ROUND_CLOSEST(vlv_clock_get_hpll_vco(display->drm) << 1,
					    cdclk) - 1;

		/* adjust cdclk divider */
		val = vlv_cck_read(display, CCK_DISPLAY_CLOCK_CONTROL);
		val &= ~CCK_FREQUENCY_VALUES;
		val |= divider;
		vlv_cck_write(display, CCK_DISPLAY_CLOCK_CONTROL, val);

		ret = poll_timeout_us(val = vlv_cck_read(display, CCK_DISPLAY_CLOCK_CONTROL),
				      (val & CCK_FREQUENCY_STATUS) == (divider << CCK_FREQUENCY_STATUS_SHIFT),
				      500, 50 * 1000, false);
		if (ret)
			drm_err(display->drm, "timed out waiting for CDCLK change\n");
	}

	/* adjust self-refresh exit latency value */
	val = vlv_bunit_read(display, BUNIT_REG_BISOC);
	val &= ~0x7f;

	/*
	 * For high bandwidth configs, we set a higher latency in the bunit
	 * so that the core display fetch happens in time to avoid underruns.
	 */
	if (cdclk == 400000)
		val |= 4500 / 250; /* 4.5 usec */
	else
		val |= 3000 / 250; /* 3.0 usec */
	vlv_bunit_write(display, BUNIT_REG_BISOC, val);

	intel_parent_vlv_iosf_put(display,
				  BIT(VLV_IOSF_SB_CCK) |
				  BIT(VLV_IOSF_SB_BUNIT) |
				  BIT(VLV_IOSF_SB_PUNIT));

	intel_update_cdclk(display);

	vlv_program_pfi_credits(display);

	intel_display_power_put(display, POWER_DOMAIN_DISPLAY_CORE, wakeref);
}

static void chv_set_cdclk(struct intel_display *display,
			  const struct intel_cdclk_config *cdclk_config,
			  enum pipe pipe)
{
	int cdclk = cdclk_config->cdclk;
	u32 val, cmd = cdclk_config->voltage_level;
	struct ref_tracker *wakeref;
	int ret;

	switch (cdclk) {
	case 333333:
	case 320000:
	case 266667:
	case 200000:
		break;
	default:
		MISSING_CASE(cdclk);
		return;
	}

	/* There are cases where we can end up here with power domains
	 * off and a CDCLK frequency other than the minimum, like when
	 * issuing a modeset without actually changing any display after
	 * a system suspend.  So grab the display core domain, which covers
	 * the HW blocks needed for the following programming.
	 */
	wakeref = intel_display_power_get(display, POWER_DOMAIN_DISPLAY_CORE);

	vlv_punit_get(display);
	val = vlv_punit_read(display, PUNIT_REG_DSPSSPM);
	val &= ~DSPFREQGUAR_MASK_CHV;
	val |= (cmd << DSPFREQGUAR_SHIFT_CHV);
	vlv_punit_write(display, PUNIT_REG_DSPSSPM, val);

	ret = poll_timeout_us(val = vlv_punit_read(display, PUNIT_REG_DSPSSPM),
			      (val & DSPFREQSTAT_MASK_CHV) == (cmd << DSPFREQSTAT_SHIFT_CHV),
			      500, 50 * 1000, false);
	if (ret)
		drm_err(display->drm, "timed out waiting for CDCLK change\n");

	vlv_punit_put(display);

	intel_update_cdclk(display);

	vlv_program_pfi_credits(display);

	intel_display_power_put(display, POWER_DOMAIN_DISPLAY_CORE, wakeref);
}

static int bdw_calc_cdclk(int min_cdclk)
{
	if (min_cdclk > 540000)
		return 675000;
	else if (min_cdclk > 450000)
		return 540000;
	else if (min_cdclk > 337500)
		return 450000;
	else
		return 337500;
}

static u8 bdw_calc_voltage_level(int cdclk)
{
	switch (cdclk) {
	default:
	case 337500:
		return 2;
	case 450000:
		return 0;
	case 540000:
		return 1;
	case 675000:
		return 3;
	}
}

static void bdw_get_cdclk(struct intel_display *display,
			  struct intel_cdclk_config *cdclk_config)
{
	u32 lcpll = intel_de_read(display, LCPLL_CTL);
	u32 freq = lcpll & LCPLL_CLK_FREQ_MASK;

	if (lcpll & LCPLL_CD_SOURCE_FCLK)
		cdclk_config->cdclk = 800000;
	else if (intel_de_read(display, FUSE_STRAP) & HSW_CDCLK_LIMIT)
		cdclk_config->cdclk = 450000;
	else if (freq == LCPLL_CLK_FREQ_450)
		cdclk_config->cdclk = 450000;
	else if (freq == LCPLL_CLK_FREQ_54O_BDW)
		cdclk_config->cdclk = 540000;
	else if (freq == LCPLL_CLK_FREQ_337_5_BDW)
		cdclk_config->cdclk = 337500;
	else
		cdclk_config->cdclk = 675000;

	/*
	 * Can't read this out :( Let's assume it's
	 * at least what the CDCLK frequency requires.
	 */
	cdclk_config->voltage_level =
		bdw_calc_voltage_level(cdclk_config->cdclk);
}

static u32 bdw_cdclk_freq_sel(int cdclk)
{
	switch (cdclk) {
	default:
		MISSING_CASE(cdclk);
		fallthrough;
	case 337500:
		return LCPLL_CLK_FREQ_337_5_BDW;
	case 450000:
		return LCPLL_CLK_FREQ_450;
	case 540000:
		return LCPLL_CLK_FREQ_54O_BDW;
	case 675000:
		return LCPLL_CLK_FREQ_675_BDW;
	}
}

static void bdw_set_cdclk(struct intel_display *display,
			  const struct intel_cdclk_config *cdclk_config,
			  enum pipe pipe)
{
	int cdclk = cdclk_config->cdclk;
	int ret;

	if (drm_WARN(display->drm,
		     (intel_de_read(display, LCPLL_CTL) &
		      (LCPLL_PLL_DISABLE | LCPLL_PLL_LOCK |
		       LCPLL_CD_CLOCK_DISABLE | LCPLL_ROOT_CD_CLOCK_DISABLE |
		       LCPLL_CD2X_CLOCK_DISABLE | LCPLL_POWER_DOWN_ALLOW |
		       LCPLL_CD_SOURCE_FCLK)) != LCPLL_PLL_LOCK,
		     "trying to change cdclk frequency with cdclk not enabled\n"))
		return;

	ret = intel_parent_pcode_write(display, BDW_PCODE_DISPLAY_FREQ_CHANGE_REQ, 0x0);
	if (ret) {
		drm_err(display->drm,
			"failed to inform pcode about cdclk change\n");
		return;
	}

	intel_de_rmw(display, LCPLL_CTL,
		     0, LCPLL_CD_SOURCE_FCLK);

	/*
	 * According to the spec, it should be enough to poll for this 1 us.
	 * However, extensive testing shows that this can take longer.
	 */
	ret = intel_de_wait_for_set_us(display, LCPLL_CTL,
				       LCPLL_CD_SOURCE_FCLK_DONE, 100);
	if (ret)
		drm_err(display->drm, "Switching to FCLK failed\n");

	intel_de_rmw(display, LCPLL_CTL,
		     LCPLL_CLK_FREQ_MASK, bdw_cdclk_freq_sel(cdclk));

	intel_de_rmw(display, LCPLL_CTL,
		     LCPLL_CD_SOURCE_FCLK, 0);

	ret = intel_de_wait_for_clear_us(display, LCPLL_CTL,
					 LCPLL_CD_SOURCE_FCLK_DONE, 1);
	if (ret)
		drm_err(display->drm, "Switching back to LCPLL failed\n");

	intel_parent_pcode_write(display, HSW_PCODE_DE_WRITE_FREQ_REQ,
				 cdclk_config->voltage_level);

	intel_de_write(display, CDCLK_FREQ,
		       DIV_ROUND_CLOSEST(cdclk, 1000) - 1);

	intel_update_cdclk(display);
}

static int skl_calc_cdclk(int min_cdclk, int vco)
{
	if (vco == 8640000) {
		if (min_cdclk > 540000)
			return 617143;
		else if (min_cdclk > 432000)
			return 540000;
		else if (min_cdclk > 308571)
			return 432000;
		else
			return 308571;
	} else {
		if (min_cdclk > 540000)
			return 675000;
		else if (min_cdclk > 450000)
			return 540000;
		else if (min_cdclk > 337500)
			return 450000;
		else
			return 337500;
	}
}

static u8 skl_calc_voltage_level(int cdclk)
{
	if (cdclk > 540000)
		return 3;
	else if (cdclk > 450000)
		return 2;
	else if (cdclk > 337500)
		return 1;
	else
		return 0;
}

static void skl_dpll0_update(struct intel_display *display,
			     struct intel_cdclk_config *cdclk_config)
{
	u32 val;

	cdclk_config->ref = 24000;
	cdclk_config->vco = 0;

	val = intel_de_read(display, LCPLL1_CTL);
	if ((val & LCPLL_PLL_ENABLE) == 0)
		return;

	if (drm_WARN_ON(display->drm, (val & LCPLL_PLL_LOCK) == 0))
		return;

	val = intel_de_read(display, DPLL_CTRL1);

	if (drm_WARN_ON(display->drm,
			(val & (DPLL_CTRL1_HDMI_MODE(SKL_DPLL0) |
				DPLL_CTRL1_SSC(SKL_DPLL0) |
				DPLL_CTRL1_OVERRIDE(SKL_DPLL0))) !=
			DPLL_CTRL1_OVERRIDE(SKL_DPLL0)))
		return;

	switch (val & DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0)) {
	case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810, SKL_DPLL0):
	case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1350, SKL_DPLL0):
	case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1620, SKL_DPLL0):
	case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_2700, SKL_DPLL0):
		cdclk_config->vco = 8100000;
		break;
	case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1080, SKL_DPLL0):
	case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_2160, SKL_DPLL0):
		cdclk_config->vco = 8640000;
		break;
	default:
		MISSING_CASE(val & DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0));
		break;
	}
}

static void skl_get_cdclk(struct intel_display *display,
			  struct intel_cdclk_config *cdclk_config)
{
	u32 cdctl;

	skl_dpll0_update(display, cdclk_config);

	cdclk_config->cdclk = cdclk_config->bypass = cdclk_config->ref;

	if (cdclk_config->vco == 0)
		goto out;

	cdctl = intel_de_read(display, CDCLK_CTL);

	if (cdclk_config->vco == 8640000) {
		switch (cdctl & CDCLK_FREQ_SEL_MASK) {
		case CDCLK_FREQ_450_432:
			cdclk_config->cdclk = 432000;
			break;
		case CDCLK_FREQ_337_308:
			cdclk_config->cdclk = 308571;
			break;
		case CDCLK_FREQ_540:
			cdclk_config->cdclk = 540000;
			break;
		case CDCLK_FREQ_675_617:
			cdclk_config->cdclk = 617143;
			break;
		default:
			MISSING_CASE(cdctl & CDCLK_FREQ_SEL_MASK);
			break;
		}
	} else {
		switch (cdctl & CDCLK_FREQ_SEL_MASK) {
		case CDCLK_FREQ_450_432:
			cdclk_config->cdclk = 450000;
			break;
		case CDCLK_FREQ_337_308:
			cdclk_config->cdclk = 337500;
			break;
		case CDCLK_FREQ_540:
			cdclk_config->cdclk = 540000;
			break;
		case CDCLK_FREQ_675_617:
			cdclk_config->cdclk = 675000;
			break;
		default:
			MISSING_CASE(cdctl & CDCLK_FREQ_SEL_MASK);
			break;
		}
	}

 out:
	/*
	 * Can't read this out :( Let's assume it's
	 * at least what the CDCLK frequency requires.
	 */
	cdclk_config->voltage_level =
		skl_calc_voltage_level(cdclk_config->cdclk);
}

/* convert from kHz to .1 fixpoint MHz with -1MHz offset */
static int skl_cdclk_decimal(int cdclk)
{
	return DIV_ROUND_CLOSEST(cdclk - 1000, 500);
}

static void skl_set_preferred_cdclk_vco(struct intel_display *display, int vco)
{
	bool changed = display->cdclk.skl_preferred_vco_freq != vco;

	display->cdclk.skl_preferred_vco_freq = vco;

	if (changed)
		intel_update_max_cdclk(display);
}

static u32 skl_dpll0_link_rate(struct intel_display *display, int vco)
{
	drm_WARN_ON(display->drm, vco != 8100000 && vco != 8640000);

	/*
	 * We always enable DPLL0 with the lowest link rate possible, but still
	 * taking into account the VCO required to operate the eDP panel at the
	 * desired frequency. The usual DP link rates operate with a VCO of
	 * 8100 while the eDP 1.4 alternate link rates need a VCO of 8640.
	 * The modeset code is responsible for the selection of the exact link
	 * rate later on, with the constraint of choosing a frequency that
	 * works with vco.
	 */
	if (vco == 8640000)
		return DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1080, SKL_DPLL0);
	else
		return DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810, SKL_DPLL0);
}

static void skl_dpll0_enable(struct intel_display *display, int vco)
{
	intel_de_rmw(display, DPLL_CTRL1,
		     DPLL_CTRL1_HDMI_MODE(SKL_DPLL0) |
		     DPLL_CTRL1_SSC(SKL_DPLL0) |
		     DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0),
		     DPLL_CTRL1_OVERRIDE(SKL_DPLL0) |
		     skl_dpll0_link_rate(display, vco));
	intel_de_posting_read(display, DPLL_CTRL1);

	intel_de_rmw(display, LCPLL1_CTL,
		     0, LCPLL_PLL_ENABLE);

	if (intel_de_wait_for_set_ms(display, LCPLL1_CTL, LCPLL_PLL_LOCK, 5))
		drm_err(display->drm, "DPLL0 not locked\n");

	display->cdclk.hw.vco = vco;

	/* We'll want to keep using the current vco from now on. */
	skl_set_preferred_cdclk_vco(display, vco);
}

static void skl_dpll0_disable(struct intel_display *display)
{
	intel_de_rmw(display, LCPLL1_CTL,
		     LCPLL_PLL_ENABLE, 0);

	if (intel_de_wait_for_clear_ms(display, LCPLL1_CTL, LCPLL_PLL_LOCK, 1))
		drm_err(display->drm, "Couldn't disable DPLL0\n");

	display->cdclk.hw.vco = 0;
}

static u32 skl_cdclk_freq_sel(struct intel_display *display,
			      int cdclk, int vco)
{
	switch (cdclk) {
	default:
		drm_WARN_ON(display->drm,
			    cdclk != display->cdclk.hw.bypass);
		drm_WARN_ON(display->drm, vco != 0);
		fallthrough;
	case 308571:
	case 337500:
		return CDCLK_FREQ_337_308;
	case 450000:
	case 432000:
		return CDCLK_FREQ_450_432;
	case 540000:
		return CDCLK_FREQ_540;
	case 617143:
	case 675000:
		return CDCLK_FREQ_675_617;
	}
}

static void skl_set_cdclk(struct intel_display *display,
			  const struct intel_cdclk_config *cdclk_config,
			  enum pipe pipe)
{
	int cdclk = cdclk_config->cdclk;
	int vco = cdclk_config->vco;
	u32 freq_select, cdclk_ctl;
	int ret;

	/*
	 * Based on WA#1183 CDCLK rates 308 and 617MHz CDCLK rates are
	 * unsupported on SKL. In theory this should never happen since only
	 * the eDP1.4 2.16 and 4.32Gbps rates require it, but eDP1.4 is not
	 * supported on SKL either, see the above WA. WARN whenever trying to
	 * use the corresponding VCO freq as that always leads to using the
	 * minimum 308MHz CDCLK.
	 */
	drm_WARN_ON_ONCE(display->drm,
			 display->platform.skylake && vco == 8640000);

	ret = intel_parent_pcode_request(display, SKL_PCODE_CDCLK_CONTROL,
					 SKL_CDCLK_PREPARE_FOR_CHANGE,
					 SKL_CDCLK_READY_FOR_CHANGE,
					 SKL_CDCLK_READY_FOR_CHANGE, 3);
	if (ret) {
		drm_err(display->drm,
			"Failed to inform PCU about cdclk change (%d)\n", ret);
		return;
	}

	freq_select = skl_cdclk_freq_sel(display, cdclk, vco);

	if (display->cdclk.hw.vco != 0 &&
	    display->cdclk.hw.vco != vco)
		skl_dpll0_disable(display);

	cdclk_ctl = intel_de_read(display, CDCLK_CTL);

	if (display->cdclk.hw.vco != vco) {
		/* Wa Display #1183: skl,kbl,cfl */
		cdclk_ctl &= ~(CDCLK_FREQ_SEL_MASK | CDCLK_FREQ_DECIMAL_MASK);
		cdclk_ctl |= freq_select | skl_cdclk_decimal(cdclk);
		intel_de_write(display, CDCLK_CTL, cdclk_ctl);
	}

	/* Wa Display #1183: skl,kbl,cfl */
	cdclk_ctl |= CDCLK_DIVMUX_CD_OVERRIDE;
	intel_de_write(display, CDCLK_CTL, cdclk_ctl);
	intel_de_posting_read(display, CDCLK_CTL);

	if (display->cdclk.hw.vco != vco)
		skl_dpll0_enable(display, vco);

	/* Wa Display #1183: skl,kbl,cfl */
	cdclk_ctl &= ~(CDCLK_FREQ_SEL_MASK | CDCLK_FREQ_DECIMAL_MASK);
	intel_de_write(display, CDCLK_CTL, cdclk_ctl);

	cdclk_ctl |= freq_select | skl_cdclk_decimal(cdclk);
	intel_de_write(display, CDCLK_CTL, cdclk_ctl);

	/* Wa Display #1183: skl,kbl,cfl */
	cdclk_ctl &= ~CDCLK_DIVMUX_CD_OVERRIDE;
	intel_de_write(display, CDCLK_CTL, cdclk_ctl);
	intel_de_posting_read(display, CDCLK_CTL);

	/* inform PCU of the change */
	intel_parent_pcode_write(display, SKL_PCODE_CDCLK_CONTROL,
				 cdclk_config->voltage_level);

	intel_update_cdclk(display);
}

static void skl_sanitize_cdclk(struct intel_display *display)
{
	u32 cdctl, expected, swf18;

	/*
	 * check if the pre-os initialized the display
	 * There is SWF18 scratchpad register defined which is set by the
	 * pre-os which can be used by the OS drivers to check the status
	 */
	swf18 = intel_de_read(display, SWF_ILK(0x18));
	if ((swf18 & 0x00FFFFFF) == 0) {
		drm_dbg_kms(display->drm, "Sanitizing CDCLK due to SWF18 0x%x\n", swf18);
		goto sanitize;
	}

	intel_update_cdclk(display);
	intel_cdclk_dump_config(display, &display->cdclk.hw, "Current CDCLK");

	/* Is PLL enabled and locked ? */
	if (display->cdclk.hw.vco == 0 ||
	    display->cdclk.hw.cdclk == display->cdclk.hw.bypass) {
		drm_dbg_kms(display->drm, "Sanitizing CDCLK due to PLL not enabled/locked\n");
		goto sanitize;
	}

	/* DPLL okay; verify the cdclock
	 *
	 * Noticed in some instances that the freq selection is correct but
	 * decimal part is programmed wrong from BIOS where pre-os does not
	 * enable display. Verify the same as well.
	 */
	cdctl = intel_de_read(display, CDCLK_CTL);
	expected = (cdctl & CDCLK_FREQ_SEL_MASK) |
		skl_cdclk_decimal(display->cdclk.hw.cdclk);

	if (cdctl != expected) {
		cdctl &= ~CDCLK_FREQ_DECIMAL_MASK;
		cdctl |= expected & CDCLK_FREQ_DECIMAL_MASK;

		if (cdctl != expected) {
			drm_dbg_kms(display->drm, "Sanitizing CDCLK due to CDCLK_CTL 0x%x, expected 0x%x)\n",
				    intel_de_read(display, CDCLK_CTL), expected);
			goto sanitize;
		}

		drm_dbg_kms(display->drm, "Sanitizing CDCLK decimal divider (CDCLK_CTL 0x%x, expected 0x%x)\n",
			    intel_de_read(display, CDCLK_CTL), expected);

		intel_de_write(display, CDCLK_CTL, expected);
	}

	/* All well; nothing to sanitize */
	return;

sanitize:
	/* force cdclk programming */
	display->cdclk.hw.cdclk = 0;
	/* force full PLL disable + enable */
	display->cdclk.hw.vco = ~0;
}

static void skl_cdclk_init_hw(struct intel_display *display)
{
	struct intel_cdclk_config cdclk_config;

	skl_sanitize_cdclk(display);

	if (display->cdclk.hw.cdclk != 0 &&
	    display->cdclk.hw.vco != 0) {
		/*
		 * Use the current vco as our initial
		 * guess as to what the preferred vco is.
		 */
		if (display->cdclk.skl_preferred_vco_freq == 0)
			skl_set_preferred_cdclk_vco(display,
						    display->cdclk.hw.vco);
		return;
	}

	cdclk_config = display->cdclk.hw;

	cdclk_config.vco = display->cdclk.skl_preferred_vco_freq;
	if (cdclk_config.vco == 0)
		cdclk_config.vco = 8100000;
	cdclk_config.cdclk = skl_calc_cdclk(0, cdclk_config.vco);
	cdclk_config.voltage_level = skl_calc_voltage_level(cdclk_config.cdclk);

	skl_set_cdclk(display, &cdclk_config, INVALID_PIPE);
}

static void skl_cdclk_uninit_hw(struct intel_display *display)
{
	struct intel_cdclk_config cdclk_config = display->cdclk.hw;

	cdclk_config.cdclk = cdclk_config.bypass;
	cdclk_config.vco = 0;
	cdclk_config.voltage_level = skl_calc_voltage_level(cdclk_config.cdclk);

	skl_set_cdclk(display, &cdclk_config, INVALID_PIPE);
}

struct intel_cdclk_vals {
	u32 cdclk;
	u16 refclk;
	u16 waveform;
	u8 ratio;
};

static const struct intel_cdclk_vals bxt_cdclk_table[] = {
	{ .refclk = 19200, .cdclk = 144000, .ratio = 60 },
	{ .refclk = 19200, .cdclk = 288000, .ratio = 60 },
	{ .refclk = 19200, .cdclk = 384000, .ratio = 60 },
	{ .refclk = 19200, .cdclk = 576000, .ratio = 60 },
	{ .refclk = 19200, .cdclk = 624000, .ratio = 65 },
	{}
};

static const struct intel_cdclk_vals glk_cdclk_table[] = {
	{ .refclk = 19200, .cdclk =  79200, .ratio = 33 },
	{ .refclk = 19200, .cdclk = 158400, .ratio = 33 },
	{ .refclk = 19200, .cdclk = 316800, .ratio = 33 },
	{}
};

static const struct intel_cdclk_vals icl_cdclk_table[] = {
	{ .refclk = 19200, .cdclk = 172800, .ratio = 18 },
	{ .refclk = 19200, .cdclk = 192000, .ratio = 20 },
	{ .refclk = 19200, .cdclk = 307200, .ratio = 32 },
	{ .refclk = 19200, .cdclk = 326400, .ratio = 68 },
	{ .refclk = 19200, .cdclk = 556800, .ratio = 58 },
	{ .refclk = 19200, .cdclk = 652800, .ratio = 68 },

	{ .refclk = 24000, .cdclk = 180000, .ratio = 15 },
	{ .refclk = 24000, .cdclk = 192000, .ratio = 16 },
	{ .refclk = 24000, .cdclk = 312000, .ratio = 26 },
	{ .refclk = 24000, .cdclk = 324000, .ratio = 54 },
	{ .refclk = 24000, .cdclk = 552000, .ratio = 46 },
	{ .refclk = 24000, .cdclk = 648000, .ratio = 54 },

	{ .refclk = 38400, .cdclk = 172800, .ratio =  9 },
	{ .refclk = 38400, .cdclk = 192000, .ratio = 10 },
	{ .refclk = 38400, .cdclk = 307200, .ratio = 16 },
	{ .refclk = 38400, .cdclk = 326400, .ratio = 34 },
	{ .refclk = 38400, .cdclk = 556800, .ratio = 29 },
	{ .refclk = 38400, .cdclk = 652800, .ratio = 34 },
	{}
};

static const struct intel_cdclk_vals rkl_cdclk_table[] = {
	{ .refclk = 19200, .cdclk = 172800, .ratio =  36 },
	{ .refclk = 19200, .cdclk = 192000, .ratio =  40 },
	{ .refclk = 19200, .cdclk = 307200, .ratio =  64 },
	{ .refclk = 19200, .cdclk = 326400, .ratio = 136 },
	{ .refclk = 19200, .cdclk = 556800, .ratio = 116 },
	{ .refclk = 19200, .cdclk = 652800, .ratio = 136 },

	{ .refclk = 24000, .cdclk = 180000, .ratio =  30 },
	{ .refclk = 24000, .cdclk = 192000, .ratio =  32 },
	{ .refclk = 24000, .cdclk = 312000, .ratio =  52 },
	{ .refclk = 24000, .cdclk = 324000, .ratio = 108 },
	{ .refclk = 24000, .cdclk = 552000, .ratio =  92 },
	{ .refclk = 24000, .cdclk = 648000, .ratio = 108 },

	{ .refclk = 38400, .cdclk = 172800, .ratio = 18 },
	{ .refclk = 38400, .cdclk = 192000, .ratio = 20 },
	{ .refclk = 38400, .cdclk = 307200, .ratio = 32 },
	{ .refclk = 38400, .cdclk = 326400, .ratio = 68 },
	{ .refclk = 38400, .cdclk = 556800, .ratio = 58 },
	{ .refclk = 38400, .cdclk = 652800, .ratio = 68 },
	{}
};

static const struct intel_cdclk_vals adlp_a_step_cdclk_table[] = {
	{ .refclk = 19200, .cdclk = 307200, .ratio = 32 },
	{ .refclk = 19200, .cdclk = 556800, .ratio = 58 },
	{ .refclk = 19200, .cdclk = 652800, .ratio = 68 },

	{ .refclk = 24000, .cdclk = 312000, .ratio = 26 },
	{ .refclk = 24000, .cdclk = 552000, .ratio = 46 },
	{ .refclk = 24400, .cdclk = 648000, .ratio = 54 },

	{ .refclk = 38400, .cdclk = 307200, .ratio = 16 },
	{ .refclk = 38400, .cdclk = 556800, .ratio = 29 },
	{ .refclk = 38400, .cdclk = 652800, .ratio = 34 },
	{}
};

static const struct intel_cdclk_vals adlp_cdclk_table[] = {
	{ .refclk = 19200, .cdclk = 172800, .ratio = 27 },
	{ .refclk = 19200, .cdclk = 192000, .ratio = 20 },
	{ .refclk = 19200, .cdclk = 307200, .ratio = 32 },
	{ .refclk = 19200, .cdclk = 556800, .ratio = 58 },
	{ .refclk = 19200, .cdclk = 652800, .ratio = 68 },

	{ .refclk = 24000, .cdclk = 176000, .ratio = 22 },
	{ .refclk = 24000, .cdclk = 192000, .ratio = 16 },
	{ .refclk = 24000, .cdclk = 312000, .ratio = 26 },
	{ .refclk = 24000, .cdclk = 552000, .ratio = 46 },
	{ .refclk = 24000, .cdclk = 648000, .ratio = 54 },

	{ .refclk = 38400, .cdclk = 179200, .ratio = 14 },
	{ .refclk = 38400, .cdclk = 192000, .ratio = 10 },
	{ .refclk = 38400, .cdclk = 307200, .ratio = 16 },
	{ .refclk = 38400, .cdclk = 556800, .ratio = 29 },
	{ .refclk = 38400, .cdclk = 652800, .ratio = 34 },
	{}
};

static const struct intel_cdclk_vals rplu_cdclk_table[] = {
	{ .refclk = 19200, .cdclk = 172800, .ratio = 27 },
	{ .refclk = 19200, .cdclk = 192000, .ratio = 20 },
	{ .refclk = 19200, .cdclk = 307200, .ratio = 32 },
	{ .refclk = 19200, .cdclk = 480000, .ratio = 50 },
	{ .refclk = 19200, .cdclk = 556800, .ratio = 58 },
	{ .refclk = 19200, .cdclk = 652800, .ratio = 68 },

	{ .refclk = 24000, .cdclk = 176000, .ratio = 22 },
	{ .refclk = 24000, .cdclk = 192000, .ratio = 16 },
	{ .refclk = 24000, .cdclk = 312000, .ratio = 26 },
	{ .refclk = 24000, .cdclk = 480000, .ratio = 40 },
	{ .refclk = 24000, .cdclk = 552000, .ratio = 46 },
	{ .refclk = 24000, .cdclk = 648000, .ratio = 54 },

	{ .refclk = 38400, .cdclk = 179200, .ratio = 14 },
	{ .refclk = 38400, .cdclk = 192000, .ratio = 10 },
	{ .refclk = 38400, .cdclk = 307200, .ratio = 16 },
	{ .refclk = 38400, .cdclk = 480000, .ratio = 25 },
	{ .refclk = 38400, .cdclk = 556800, .ratio = 29 },
	{ .refclk = 38400, .cdclk = 652800, .ratio = 34 },
	{}
};

static const struct intel_cdclk_vals dg2_cdclk_table[] = {
	{ .refclk = 38400, .cdclk = 163200, .ratio = 34, .waveform = 0x8888 },
	{ .refclk = 38400, .cdclk = 204000, .ratio = 34, .waveform = 0x9248 },
	{ .refclk = 38400, .cdclk = 244800, .ratio = 34, .waveform = 0xa4a4 },
	{ .refclk = 38400, .cdclk = 285600, .ratio = 34, .waveform = 0xa54a },
	{ .refclk = 38400, .cdclk = 326400, .ratio = 34, .waveform = 0xaaaa },
	{ .refclk = 38400, .cdclk = 367200, .ratio = 34, .waveform = 0xad5a },
	{ .refclk = 38400, .cdclk = 408000, .ratio = 34, .waveform = 0xb6b6 },
	{ .refclk = 38400, .cdclk = 448800, .ratio = 34, .waveform = 0xdbb6 },
	{ .refclk = 38400, .cdclk = 489600, .ratio = 34, .waveform = 0xeeee },
	{ .refclk = 38400, .cdclk = 530400, .ratio = 34, .waveform = 0xf7de },
	{ .refclk = 38400, .cdclk = 571200, .ratio = 34, .waveform = 0xfefe },
	{ .refclk = 38400, .cdclk = 612000, .ratio = 34, .waveform = 0xfffe },
	{ .refclk = 38400, .cdclk = 652800, .ratio = 34, .waveform = 0xffff },
	{}
};

static const struct intel_cdclk_vals mtl_cdclk_table[] = {
	{ .refclk = 38400, .cdclk = 172800, .ratio = 16, .waveform = 0xad5a },
	{ .refclk = 38400, .cdclk = 192000, .ratio = 16, .waveform = 0xb6b6 },
	{ .refclk = 38400, .cdclk = 307200, .ratio = 16, .waveform = 0x0000 },
	{ .refclk = 38400, .cdclk = 480000, .ratio = 25, .waveform = 0x0000 },
	{ .refclk = 38400, .cdclk = 556800, .ratio = 29, .waveform = 0x0000 },
	{ .refclk = 38400, .cdclk = 652800, .ratio = 34, .waveform = 0x0000 },
	{}
};

static const struct intel_cdclk_vals xe2lpd_cdclk_table[] = {
	{ .refclk = 38400, .cdclk = 153600, .ratio = 16, .waveform = 0xaaaa },
	{ .refclk = 38400, .cdclk = 172800, .ratio = 16, .waveform = 0xad5a },
	{ .refclk = 38400, .cdclk = 192000, .ratio = 16, .waveform = 0xb6b6 },
	{ .refclk = 38400, .cdclk = 211200, .ratio = 16, .waveform = 0xdbb6 },
	{ .refclk = 38400, .cdclk = 230400, .ratio = 16, .waveform = 0xeeee },
	{ .refclk = 38400, .cdclk = 249600, .ratio = 16, .waveform = 0xf7de },
	{ .refclk = 38400, .cdclk = 268800, .ratio = 16, .waveform = 0xfefe },
	{ .refclk = 38400, .cdclk = 288000, .ratio = 16, .waveform = 0xfffe },
	{ .refclk = 38400, .cdclk = 307200, .ratio = 16, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 330000, .ratio = 25, .waveform = 0xdbb6 },
	{ .refclk = 38400, .cdclk = 360000, .ratio = 25, .waveform = 0xeeee },
	{ .refclk = 38400, .cdclk = 390000, .ratio = 25, .waveform = 0xf7de },
	{ .refclk = 38400, .cdclk = 420000, .ratio = 25, .waveform = 0xfefe },
	{ .refclk = 38400, .cdclk = 450000, .ratio = 25, .waveform = 0xfffe },
	{ .refclk = 38400, .cdclk = 480000, .ratio = 25, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 487200, .ratio = 29, .waveform = 0xfefe },
	{ .refclk = 38400, .cdclk = 522000, .ratio = 29, .waveform = 0xfffe },
	{ .refclk = 38400, .cdclk = 556800, .ratio = 29, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 571200, .ratio = 34, .waveform = 0xfefe },
	{ .refclk = 38400, .cdclk = 612000, .ratio = 34, .waveform = 0xfffe },
	{ .refclk = 38400, .cdclk = 652800, .ratio = 34, .waveform = 0xffff },
	{}
};

/*
 * Xe2_HPD always uses the minimal cdclk table from Wa_15015413771
 */
static const struct intel_cdclk_vals xe2hpd_cdclk_table[] = {
	{ .refclk = 38400, .cdclk = 652800, .ratio = 34, .waveform = 0xffff },
	{}
};

static const struct intel_cdclk_vals xe3lpd_cdclk_table[] = {
	{ .refclk = 38400, .cdclk = 153600, .ratio = 16, .waveform = 0xaaaa },
	{ .refclk = 38400, .cdclk = 172800, .ratio = 16, .waveform = 0xad5a },
	{ .refclk = 38400, .cdclk = 192000, .ratio = 16, .waveform = 0xb6b6 },
	{ .refclk = 38400, .cdclk = 211200, .ratio = 16, .waveform = 0xdbb6 },
	{ .refclk = 38400, .cdclk = 230400, .ratio = 16, .waveform = 0xeeee },
	{ .refclk = 38400, .cdclk = 249600, .ratio = 16, .waveform = 0xf7de },
	{ .refclk = 38400, .cdclk = 268800, .ratio = 16, .waveform = 0xfefe },
	{ .refclk = 38400, .cdclk = 288000, .ratio = 16, .waveform = 0xfffe },
	{ .refclk = 38400, .cdclk = 307200, .ratio = 16, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 326400, .ratio = 17, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 345600, .ratio = 18, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 364800, .ratio = 19, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 384000, .ratio = 20, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 403200, .ratio = 21, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 422400, .ratio = 22, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 441600, .ratio = 23, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 460800, .ratio = 24, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 480000, .ratio = 25, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 499200, .ratio = 26, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 518400, .ratio = 27, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 537600, .ratio = 28, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 556800, .ratio = 29, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 576000, .ratio = 30, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 595200, .ratio = 31, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 614400, .ratio = 32, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 633600, .ratio = 33, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 652800, .ratio = 34, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 672000, .ratio = 35, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 691200, .ratio = 36, .waveform = 0xffff },
	{}
};

static const struct intel_cdclk_vals xe3p_lpd_cdclk_table[] = {
	{ .refclk = 38400, .cdclk = 151200, .ratio = 21, .waveform = 0xa4a4 },
	{ .refclk = 38400, .cdclk = 176400, .ratio = 21, .waveform = 0xaa54 },
	{ .refclk = 38400, .cdclk = 201600, .ratio = 21, .waveform = 0xaaaa },
	{ .refclk = 38400, .cdclk = 226800, .ratio = 21, .waveform = 0xad5a },
	{ .refclk = 38400, .cdclk = 252000, .ratio = 21, .waveform = 0xb6b6 },
	{ .refclk = 38400, .cdclk = 277200, .ratio = 21, .waveform = 0xdbb6 },
	{ .refclk = 38400, .cdclk = 302400, .ratio = 21, .waveform = 0xeeee },
	{ .refclk = 38400, .cdclk = 327600, .ratio = 21, .waveform = 0xf7de },
	{ .refclk = 38400, .cdclk = 352800, .ratio = 21, .waveform = 0xfefe },
	{ .refclk = 38400, .cdclk = 378000, .ratio = 21, .waveform = 0xfffe },
	{ .refclk = 38400, .cdclk = 403200, .ratio = 21, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 422400, .ratio = 22, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 441600, .ratio = 23, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 460800, .ratio = 24, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 480000, .ratio = 25, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 499200, .ratio = 26, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 518400, .ratio = 27, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 537600, .ratio = 28, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 556800, .ratio = 29, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 576000, .ratio = 30, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 595200, .ratio = 31, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 614400, .ratio = 32, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 633600, .ratio = 33, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 652800, .ratio = 34, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 672000, .ratio = 35, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 691200, .ratio = 36, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 710400, .ratio = 37, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 729600, .ratio = 38, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 748800, .ratio = 39, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 768000, .ratio = 40, .waveform = 0xffff },
	{ .refclk = 38400, .cdclk = 787200, .ratio = 41, .waveform = 0xffff },
	{}
};

static const int cdclk_squash_len = 16;

static int cdclk_squash_divider(u16 waveform)
{
	return hweight16(waveform ?: 0xffff);
}

static int cdclk_divider(int cdclk, int vco, u16 waveform)
{
	/* 2 * cd2x divider */
	return DIV_ROUND_CLOSEST(vco * cdclk_squash_divider(waveform),
				 cdclk * cdclk_squash_len);
}

static int bxt_calc_cdclk(struct intel_display *display, int min_cdclk)
{
	const struct intel_cdclk_vals *table = display->cdclk.table;
	int i;

	for (i = 0; table[i].refclk; i++)
		if (table[i].refclk == display->cdclk.hw.ref &&
		    table[i].cdclk >= min_cdclk)
			return table[i].cdclk;

	drm_WARN(display->drm, 1,
		 "Cannot satisfy minimum cdclk %d with refclk %u\n",
		 min_cdclk, display->cdclk.hw.ref);
	return display->cdclk.max_cdclk_freq;
}

static int bxt_calc_cdclk_pll_vco(struct intel_display *display, int cdclk)
{
	const struct intel_cdclk_vals *table = display->cdclk.table;
	int i;

	if (cdclk == display->cdclk.hw.bypass)
		return 0;

	for (i = 0; table[i].refclk; i++)
		if (table[i].refclk == display->cdclk.hw.ref &&
		    table[i].cdclk == cdclk)
			return display->cdclk.hw.ref * table[i].ratio;

	drm_WARN(display->drm, 1, "cdclk %d not valid for refclk %u\n",
		 cdclk, display->cdclk.hw.ref);
	return 0;
}

static u8 bxt_calc_voltage_level(int cdclk)
{
	return DIV_ROUND_UP(cdclk, 25000);
}

static u8 calc_voltage_level(int cdclk, int num_voltage_levels,
			     const int voltage_level_max_cdclk[])
{
	int voltage_level;

	for (voltage_level = 0; voltage_level < num_voltage_levels; voltage_level++) {
		if (cdclk <= voltage_level_max_cdclk[voltage_level])
			return voltage_level;
	}

	MISSING_CASE(cdclk);
	return num_voltage_levels - 1;
}

static u8 icl_calc_voltage_level(int cdclk)
{
	static const int icl_voltage_level_max_cdclk[] = {
		[0] = 312000,
		[1] = 556800,
		[2] = 652800,
	};

	return calc_voltage_level(cdclk,
				  ARRAY_SIZE(icl_voltage_level_max_cdclk),
				  icl_voltage_level_max_cdclk);
}

static u8 ehl_calc_voltage_level(int cdclk)
{
	static const int ehl_voltage_level_max_cdclk[] = {
		[0] = 180000,
		[1] = 312000,
		[2] = 326400,
		/*
		 * Bspec lists the limit as 556.8 MHz, but some JSL
		 * development boards (at least) boot with 652.8 MHz
		 */
		[3] = 652800,
	};

	return calc_voltage_level(cdclk,
				  ARRAY_SIZE(ehl_voltage_level_max_cdclk),
				  ehl_voltage_level_max_cdclk);
}

static u8 tgl_calc_voltage_level(int cdclk)
{
	static const int tgl_voltage_level_max_cdclk[] = {
		[0] = 312000,
		[1] = 326400,
		[2] = 556800,
		[3] = 652800,
	};

	return calc_voltage_level(cdclk,
				  ARRAY_SIZE(tgl_voltage_level_max_cdclk),
				  tgl_voltage_level_max_cdclk);
}

static u8 rplu_calc_voltage_level(int cdclk)
{
	static const int rplu_voltage_level_max_cdclk[] = {
		[0] = 312000,
		[1] = 480000,
		[2] = 556800,
		[3] = 652800,
	};

	return calc_voltage_level(cdclk,
				  ARRAY_SIZE(rplu_voltage_level_max_cdclk),
				  rplu_voltage_level_max_cdclk);
}

static u8 xe3lpd_calc_voltage_level(int cdclk)
{
	/*
	 * Starting with xe3lpd power controller does not need the voltage
	 * index when doing the modeset update. This function is best left
	 * defined but returning 0 to the mask.
	 */
	return 0;
}

static void icl_readout_refclk(struct intel_display *display,
			       struct intel_cdclk_config *cdclk_config)
{
	u32 dssm = intel_de_read(display, SKL_DSSM) & ICL_DSSM_CDCLK_PLL_REFCLK_MASK;

	switch (dssm) {
	default:
		MISSING_CASE(dssm);
		fallthrough;
	case ICL_DSSM_CDCLK_PLL_REFCLK_24MHz:
		cdclk_config->ref = 24000;
		break;
	case ICL_DSSM_CDCLK_PLL_REFCLK_19_2MHz:
		cdclk_config->ref = 19200;
		break;
	case ICL_DSSM_CDCLK_PLL_REFCLK_38_4MHz:
		cdclk_config->ref = 38400;
		break;
	}
}

static void bxt_de_pll_readout(struct intel_display *display,
			       struct intel_cdclk_config *cdclk_config)
{
	u32 val, ratio;

	if (display->platform.dg2)
		cdclk_config->ref = 38400;
	else if (DISPLAY_VER(display) >= 11)
		icl_readout_refclk(display, cdclk_config);
	else
		cdclk_config->ref = 19200;

	val = intel_de_read(display, BXT_DE_PLL_ENABLE);
	if ((val & BXT_DE_PLL_PLL_ENABLE) == 0 ||
	    (val & BXT_DE_PLL_LOCK) == 0) {
		/*
		 * CDCLK PLL is disabled, the VCO/ratio doesn't matter, but
		 * setting it to zero is a way to signal that.
		 */
		cdclk_config->vco = 0;
		return;
	}

	/*
	 * DISPLAY_VER >= 11 have the ratio directly in the PLL enable register,
	 * gen9lp had it in a separate PLL control register.
	 */
	if (DISPLAY_VER(display) >= 11)
		ratio = val & ICL_CDCLK_PLL_RATIO_MASK;
	else
		ratio = intel_de_read(display, BXT_DE_PLL_CTL) & BXT_DE_PLL_RATIO_MASK;

	cdclk_config->vco = ratio * cdclk_config->ref;
}

static void bxt_get_cdclk(struct intel_display *display,
			  struct intel_cdclk_config *cdclk_config)
{
	u32 squash_ctl = 0;
	u32 divider;
	int div;

	bxt_de_pll_readout(display, cdclk_config);

	if (DISPLAY_VER(display) >= 12)
		cdclk_config->bypass = cdclk_config->ref / 2;
	else if (DISPLAY_VER(display) >= 11)
		cdclk_config->bypass = 50000;
	else
		cdclk_config->bypass = cdclk_config->ref;

	if (cdclk_config->vco == 0) {
		cdclk_config->cdclk = cdclk_config->bypass;
		goto out;
	}

	divider = intel_de_read(display, CDCLK_CTL) & BXT_CDCLK_CD2X_DIV_SEL_MASK;

	switch (divider) {
	case BXT_CDCLK_CD2X_DIV_SEL_1:
		div = 2;
		break;
	case BXT_CDCLK_CD2X_DIV_SEL_1_5:
		div = 3;
		break;
	case BXT_CDCLK_CD2X_DIV_SEL_2:
		div = 4;
		break;
	case BXT_CDCLK_CD2X_DIV_SEL_4:
		div = 8;
		break;
	default:
		MISSING_CASE(divider);
		return;
	}

	if (HAS_CDCLK_SQUASH(display))
		squash_ctl = intel_de_read(display, CDCLK_SQUASH_CTL);

	if (squash_ctl & CDCLK_SQUASH_ENABLE) {
		u16 waveform;
		int size;

		size = REG_FIELD_GET(CDCLK_SQUASH_WINDOW_SIZE_MASK, squash_ctl) + 1;
		waveform = REG_FIELD_GET(CDCLK_SQUASH_WAVEFORM_MASK, squash_ctl) >> (16 - size);

		cdclk_config->cdclk = DIV_ROUND_CLOSEST(hweight16(waveform) *
							cdclk_config->vco, size * div);
	} else {
		cdclk_config->cdclk = DIV_ROUND_CLOSEST(cdclk_config->vco, div);
	}

 out:
	if (DISPLAY_VER(display) >= 20)
		cdclk_config->joined_mbus = intel_de_read(display, MBUS_CTL) & MBUS_JOIN;
	/*
	 * Can't read this out :( Let's assume it's
	 * at least what the CDCLK frequency requires.
	 */
	cdclk_config->voltage_level =
		intel_cdclk_calc_voltage_level(display, cdclk_config->cdclk);
}

static void bxt_de_pll_disable(struct intel_display *display)
{
	intel_de_write(display, BXT_DE_PLL_ENABLE, 0);

	/* Timeout 200us */
	if (intel_de_wait_for_clear_ms(display,
				       BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
		drm_err(display->drm, "timeout waiting for DE PLL unlock\n");

	display->cdclk.hw.vco = 0;
}

static void bxt_de_pll_enable(struct intel_display *display, int vco)
{
	int ratio = DIV_ROUND_CLOSEST(vco, display->cdclk.hw.ref);

	intel_de_rmw(display, BXT_DE_PLL_CTL,
		     BXT_DE_PLL_RATIO_MASK, BXT_DE_PLL_RATIO(ratio));

	intel_de_write(display, BXT_DE_PLL_ENABLE, BXT_DE_PLL_PLL_ENABLE);

	/* Timeout 200us */
	if (intel_de_wait_for_set_ms(display,
				     BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
		drm_err(display->drm, "timeout waiting for DE PLL lock\n");

	display->cdclk.hw.vco = vco;
}

static void icl_cdclk_pll_disable(struct intel_display *display)
{
	/*
	 * Wa_13012396614:
	 * Fixes: A sporadic race condition between MDCLK selection and PLL
	 *        enabling.
	 * Workaround:
	 *   Change programming of MDCLK source selection in CDCLK_CTL:
	 *    - When disabling the CDCLK PLL, first set MDCLK source to be CD2XCLK.
	 *    - When enabling the CDCLK PLL, update MDCLK source selection only
	 *      after the PLL is enabled (which is already done as part of the
	 *      normal flow of _bxt_set_cdclk()).
	 */
	if (intel_display_wa(display, INTEL_DISPLAY_WA_13012396614))
		intel_de_rmw(display, CDCLK_CTL, MDCLK_SOURCE_SEL_MASK, MDCLK_SOURCE_SEL_CD2XCLK);

	intel_de_rmw(display, BXT_DE_PLL_ENABLE,
		     BXT_DE_PLL_PLL_ENABLE, 0);

	/* Timeout 200us */
	if (intel_de_wait_for_clear_ms(display, BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
		drm_err(display->drm, "timeout waiting for CDCLK PLL unlock\n");

	display->cdclk.hw.vco = 0;
}

static void icl_cdclk_pll_enable(struct intel_display *display, int vco)
{
	int ratio = DIV_ROUND_CLOSEST(vco, display->cdclk.hw.ref);
	u32 val;

	val = ICL_CDCLK_PLL_RATIO(ratio);
	intel_de_write(display, BXT_DE_PLL_ENABLE, val);

	val |= BXT_DE_PLL_PLL_ENABLE;
	intel_de_write(display, BXT_DE_PLL_ENABLE, val);

	/* Timeout 200us */
	if (intel_de_wait_for_set_ms(display, BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
		drm_err(display->drm, "timeout waiting for CDCLK PLL lock\n");

	display->cdclk.hw.vco = vco;
}

static void adlp_cdclk_pll_crawl(struct intel_display *display, int vco)
{
	int ratio = DIV_ROUND_CLOSEST(vco, display->cdclk.hw.ref);
	u32 val;

	/* Write PLL ratio without disabling */
	val = ICL_CDCLK_PLL_RATIO(ratio) | BXT_DE_PLL_PLL_ENABLE;
	intel_de_write(display, BXT_DE_PLL_ENABLE, val);

	/* Submit freq change request */
	val |= BXT_DE_PLL_FREQ_REQ;
	intel_de_write(display, BXT_DE_PLL_ENABLE, val);

	/* Timeout 200us */
	if (intel_de_wait_for_set_ms(display, BXT_DE_PLL_ENABLE,
				     BXT_DE_PLL_LOCK | BXT_DE_PLL_FREQ_REQ_ACK, 1))
		drm_err(display->drm, "timeout waiting for FREQ change request ack\n");

	val &= ~BXT_DE_PLL_FREQ_REQ;
	intel_de_write(display, BXT_DE_PLL_ENABLE, val);

	display->cdclk.hw.vco = vco;
}

static u32 bxt_cdclk_cd2x_pipe_mask(struct intel_display *display)
{
	if (DISPLAY_VER(display) >= 11)
		return ICL_CDCLK_CD2X_PIPE_MASK;
	else
		return BXT_CDCLK_CD2X_PIPE_MASK;
}

static u32 bxt_cdclk_cd2x_pipe(struct intel_display *display, enum pipe pipe)
{
	if (DISPLAY_VER(display) >= 11) {
		if (pipe == INVALID_PIPE)
			return ICL_CDCLK_CD2X_PIPE_NONE;
		else
			return ICL_CDCLK_CD2X_PIPE(pipe);
	} else {
		if (pipe == INVALID_PIPE)
			return BXT_CDCLK_CD2X_PIPE_NONE;
		else
			return BXT_CDCLK_CD2X_PIPE(pipe);
	}
}

static u32 bxt_cdclk_cd2x_div_sel(struct intel_display *display,
				  int cdclk, int vco, u16 waveform)
{
	u32 ret;

	/* cdclk = vco / 2 / div{1,1.5,2,4} */
	switch (cdclk_divider(cdclk, vco, waveform)) {
	default:
		drm_WARN_ON(display->drm,
			    cdclk != display->cdclk.hw.bypass);
		drm_WARN_ON(display->drm, vco != 0);
		fallthrough;
	case 2:
		ret = BXT_CDCLK_CD2X_DIV_SEL_1;
		break;
	case 3:
		ret = BXT_CDCLK_CD2X_DIV_SEL_1_5;
		break;
	case 4:
		ret = BXT_CDCLK_CD2X_DIV_SEL_2;
		break;
	case 8:
		ret = BXT_CDCLK_CD2X_DIV_SEL_4;
		break;
	}

	/*
	 * On Xe3_LPD onward, the expectation is to always have
	 * BXT_CDCLK_CD2X_DIV_SEL_1 as the default.
	 */
	if (DISPLAY_VER(display) >= 30)
		drm_WARN_ON(display->drm, ret != BXT_CDCLK_CD2X_DIV_SEL_1);

	return ret;
}

static u16 cdclk_squash_waveform(struct intel_display *display,
				 int cdclk)
{
	const struct intel_cdclk_vals *table = display->cdclk.table;
	int i;

	if (cdclk == display->cdclk.hw.bypass)
		return 0;

	for (i = 0; table[i].refclk; i++)
		if (table[i].refclk == display->cdclk.hw.ref &&
		    table[i].cdclk == cdclk)
			return table[i].waveform;

	drm_WARN(display->drm, 1, "cdclk %d not valid for refclk %u\n",
		 cdclk, display->cdclk.hw.ref);

	return 0xffff;
}

static void icl_cdclk_pll_update(struct intel_display *display, int vco)
{
	if (display->cdclk.hw.vco != 0 &&
	    display->cdclk.hw.vco != vco)
		icl_cdclk_pll_disable(display);

	if (display->cdclk.hw.vco != vco)
		icl_cdclk_pll_enable(display, vco);
}

static void bxt_cdclk_pll_update(struct intel_display *display, int vco)
{
	if (display->cdclk.hw.vco != 0 &&
	    display->cdclk.hw.vco != vco)
		bxt_de_pll_disable(display);

	if (display->cdclk.hw.vco != vco)
		bxt_de_pll_enable(display, vco);
}

static void dg2_cdclk_squash_program(struct intel_display *display,
				     u16 waveform)
{
	u32 squash_ctl = 0;

	if (waveform)
		squash_ctl = CDCLK_SQUASH_ENABLE |
			     CDCLK_SQUASH_WINDOW_SIZE(0xf) | waveform;

	intel_de_write(display, CDCLK_SQUASH_CTL, squash_ctl);
}

static bool cdclk_pll_is_unknown(unsigned int vco)
{
	/*
	 * Ensure driver does not take the crawl path for the
	 * case when the vco is set to ~0 in the
	 * sanitize path.
	 */
	return vco == ~0;
}

static bool mdclk_source_is_cdclk_pll(struct intel_display *display)
{
	return DISPLAY_VER(display) >= 20;
}

static u32 xe2lpd_mdclk_source_sel(struct intel_display *display)
{
	if (mdclk_source_is_cdclk_pll(display))
		return MDCLK_SOURCE_SEL_CDCLK_PLL;

	return MDCLK_SOURCE_SEL_CD2XCLK;
}

int intel_mdclk_cdclk_ratio(struct intel_display *display,
			    const struct intel_cdclk_config *cdclk_config)
{
	if (mdclk_source_is_cdclk_pll(display))
		return DIV_ROUND_UP(cdclk_config->vco, cdclk_config->cdclk);

	/* Otherwise, source for MDCLK is CD2XCLK. */
	return 2;
}

static void xe2lpd_mdclk_cdclk_ratio_program(struct intel_display *display,
					     const struct intel_cdclk_config *cdclk_config)
{
	intel_dbuf_mdclk_cdclk_ratio_update(display,
					    intel_mdclk_cdclk_ratio(display, cdclk_config),
					    cdclk_config->joined_mbus);
}

static bool cdclk_compute_crawl_and_squash_midpoint(struct intel_display *display,
						    const struct intel_cdclk_config *old_cdclk_config,
						    const struct intel_cdclk_config *new_cdclk_config,
						    struct intel_cdclk_config *mid_cdclk_config)
{
	u16 old_waveform, new_waveform, mid_waveform;
	int old_div, new_div, mid_div;

	/* Return if PLL is in an unknown state, force a complete disable and re-enable. */
	if (cdclk_pll_is_unknown(old_cdclk_config->vco))
		return false;

	/* Return if both Squash and Crawl are not present */
	if (!HAS_CDCLK_CRAWL(display) || !HAS_CDCLK_SQUASH(display))
		return false;

	old_waveform = cdclk_squash_waveform(display, old_cdclk_config->cdclk);
	new_waveform = cdclk_squash_waveform(display, new_cdclk_config->cdclk);

	/* Return if Squash only or Crawl only is the desired action */
	if (old_cdclk_config->vco == 0 || new_cdclk_config->vco == 0 ||
	    old_cdclk_config->vco == new_cdclk_config->vco ||
	    old_waveform == new_waveform)
		return false;

	old_div = cdclk_divider(old_cdclk_config->cdclk,
				old_cdclk_config->vco, old_waveform);
	new_div = cdclk_divider(new_cdclk_config->cdclk,
				new_cdclk_config->vco, new_waveform);

	/*
	 * Should not happen currently. We might need more midpoint
	 * transitions if we need to also change the cd2x divider.
	 */
	if (drm_WARN_ON(display->drm, old_div != new_div))
		return false;

	*mid_cdclk_config = *new_cdclk_config;

	/*
	 * Populate the mid_cdclk_config accordingly.
	 * - If moving to a higher cdclk, the desired action is squashing.
	 * The mid cdclk config should have the new (squash) waveform.
	 * - If moving to a lower cdclk, the desired action is crawling.
	 * The mid cdclk config should have the new vco.
	 */

	if (cdclk_squash_divider(new_waveform) > cdclk_squash_divider(old_waveform)) {
		mid_cdclk_config->vco = old_cdclk_config->vco;
		mid_div = old_div;
		mid_waveform = new_waveform;
	} else {
		mid_cdclk_config->vco = new_cdclk_config->vco;
		mid_div = new_div;
		mid_waveform = old_waveform;
	}

	mid_cdclk_config->cdclk = DIV_ROUND_CLOSEST(cdclk_squash_divider(mid_waveform) *
						    mid_cdclk_config->vco,
						    cdclk_squash_len * mid_div);

	/* make sure the mid clock came out sane */

	drm_WARN_ON(display->drm, mid_cdclk_config->cdclk <
		    min(old_cdclk_config->cdclk, new_cdclk_config->cdclk));
	drm_WARN_ON(display->drm, mid_cdclk_config->cdclk >
		    display->cdclk.max_cdclk_freq);
	drm_WARN_ON(display->drm, cdclk_squash_waveform(display, mid_cdclk_config->cdclk) !=
		    mid_waveform);

	return true;
}

static bool pll_enable_wa_needed(struct intel_display *display)
{
	return (DISPLAY_VERx100(display) == 2000 ||
		DISPLAY_VERx100(display) == 1400 ||
		display->platform.dg2) &&
		display->cdclk.hw.vco > 0;
}

static u32 bxt_cdclk_ctl(struct intel_display *display,
			 const struct intel_cdclk_config *cdclk_config,
			 enum pipe pipe)
{
	int cdclk = cdclk_config->cdclk;
	int vco = cdclk_config->vco;
	u16 waveform;
	u32 val;

	waveform = cdclk_squash_waveform(display, cdclk);

	val = bxt_cdclk_cd2x_div_sel(display, cdclk, vco, waveform);

	if (DISPLAY_VER(display) < 30)
		val |= bxt_cdclk_cd2x_pipe(display, pipe);

	/*
	 * Disable SSA Precharge when CD clock frequency < 500 MHz,
	 * enable otherwise.
	 */
	if ((display->platform.geminilake || display->platform.broxton) &&
	    cdclk >= 500000)
		val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;

	if (DISPLAY_VER(display) >= 20) {
		/*
		 * Wa_13012396614 requires selecting CD2XCLK as MDCLK source
		 * prior to disabling the PLL, which is already handled by
		 * icl_cdclk_pll_disable().  Here we are just making sure
		 * we keep the expected value.
		 */
		if (intel_display_wa(display, INTEL_DISPLAY_WA_13012396614) &&
		    vco == 0)
			val |= MDCLK_SOURCE_SEL_CD2XCLK;
		else
			val |= xe2lpd_mdclk_source_sel(display);
	} else {
		val |= skl_cdclk_decimal(cdclk);
	}

	return val;
}

static void _bxt_set_cdclk(struct intel_display *display,
			   const struct intel_cdclk_config *cdclk_config,
			   enum pipe pipe)
{
	int cdclk = cdclk_config->cdclk;
	int vco = cdclk_config->vco;

	if (HAS_CDCLK_CRAWL(display) && display->cdclk.hw.vco > 0 && vco > 0 &&
	    !cdclk_pll_is_unknown(display->cdclk.hw.vco)) {
		if (display->cdclk.hw.vco != vco)
			adlp_cdclk_pll_crawl(display, vco);
	} else if (DISPLAY_VER(display) >= 11) {
		/* wa_15010685871: dg2, mtl */
		if (pll_enable_wa_needed(display))
			dg2_cdclk_squash_program(display, 0);

		icl_cdclk_pll_update(display, vco);
	} else {
		bxt_cdclk_pll_update(display, vco);
	}

	if (HAS_CDCLK_SQUASH(display)) {
		u16 waveform = cdclk_squash_waveform(display, cdclk);

		dg2_cdclk_squash_program(display, waveform);
	}

	intel_de_write(display, CDCLK_CTL, bxt_cdclk_ctl(display, cdclk_config, pipe));

	if (pipe != INVALID_PIPE)
		intel_crtc_wait_for_next_vblank(intel_crtc_for_pipe(display, pipe));
}

static void bxt_set_cdclk(struct intel_display *display,
			  const struct intel_cdclk_config *cdclk_config,
			  enum pipe pipe)
{
	struct intel_cdclk_config mid_cdclk_config;
	int cdclk = cdclk_config->cdclk;
	int ret = 0;

	/*
	 * Inform power controller of upcoming frequency change.
	 * Display versions 14 and beyond do not follow the PUnit
	 * mailbox communication, skip
	 * this step.
	 */
	if (DISPLAY_VER(display) >= 14 || display->platform.dg2)
		; /* NOOP */
	else if (DISPLAY_VER(display) >= 11)
		ret = intel_parent_pcode_request(display, SKL_PCODE_CDCLK_CONTROL,
						 SKL_CDCLK_PREPARE_FOR_CHANGE,
						 SKL_CDCLK_READY_FOR_CHANGE,
						 SKL_CDCLK_READY_FOR_CHANGE, 3);
	else
		/*
		 * BSpec requires us to wait up to 150usec, but that leads to
		 * timeouts; the 2ms used here is based on experiment.
		 */
		ret = intel_parent_pcode_write_timeout(display,
						       HSW_PCODE_DE_WRITE_FREQ_REQ,
						       0x80000000, 2);

	if (ret) {
		drm_err(display->drm,
			"Failed to inform PCU about cdclk change (err %d, freq %d)\n",
			ret, cdclk);
		return;
	}

	if (DISPLAY_VER(display) >= 20 && cdclk < display->cdclk.hw.cdclk)
		xe2lpd_mdclk_cdclk_ratio_program(display, cdclk_config);

	if (cdclk_compute_crawl_and_squash_midpoint(display, &display->cdclk.hw,
						    cdclk_config, &mid_cdclk_config)) {
		_bxt_set_cdclk(display, &mid_cdclk_config, pipe);
		_bxt_set_cdclk(display, cdclk_config, pipe);
	} else {
		_bxt_set_cdclk(display, cdclk_config, pipe);
	}

	if (DISPLAY_VER(display) >= 20 && cdclk > display->cdclk.hw.cdclk)
		xe2lpd_mdclk_cdclk_ratio_program(display, cdclk_config);

	if (DISPLAY_VER(display) >= 14)
		/*
		 * NOOP - No Pcode communication needed for
		 * Display versions 14 and beyond
		 */;
	else if (DISPLAY_VER(display) >= 11 && !display->platform.dg2)
		ret = intel_parent_pcode_write(display, SKL_PCODE_CDCLK_CONTROL,
					       cdclk_config->voltage_level);
	if (DISPLAY_VER(display) < 11) {
		/*
		 * The timeout isn't specified, the 2ms used here is based on
		 * experiment.
		 * FIXME: Waiting for the request completion could be delayed
		 * until the next PCODE request based on BSpec.
		 */
		ret = intel_parent_pcode_write_timeout(display,
						       HSW_PCODE_DE_WRITE_FREQ_REQ,
						       cdclk_config->voltage_level, 2);
	}
	if (ret) {
		drm_err(display->drm,
			"PCode CDCLK freq set failed, (err %d, freq %d)\n",
			ret, cdclk);
		return;
	}

	intel_update_cdclk(display);

	if (DISPLAY_VER(display) >= 11)
		/*
		 * Can't read out the voltage level :(
		 * Let's just assume everything is as expected.
		 */
		display->cdclk.hw.voltage_level = cdclk_config->voltage_level;
}

static void bxt_sanitize_cdclk(struct intel_display *display)
{
	u32 cdctl, expected;
	int cdclk, vco;

	intel_update_cdclk(display);
	intel_cdclk_dump_config(display, &display->cdclk.hw, "Current CDCLK");

	if (display->cdclk.hw.vco == 0 ||
	    display->cdclk.hw.cdclk == display->cdclk.hw.bypass) {
		drm_dbg_kms(display->drm, "Sanitizing CDCLK due to PLL not enabled/locked\n");
		goto sanitize;
	}

	/* Make sure this is a legal cdclk value for the platform */
	cdclk = bxt_calc_cdclk(display, display->cdclk.hw.cdclk);
	if (cdclk != display->cdclk.hw.cdclk) {
		drm_dbg_kms(display->drm, "Sanitizing CDCLK due to bad CDCLK frequency\n");
		goto sanitize;
	}

	/* Make sure the VCO is correct for the cdclk */
	vco = bxt_calc_cdclk_pll_vco(display, cdclk);
	if (vco != display->cdclk.hw.vco) {
		drm_dbg_kms(display->drm, "Sanitizing CDCLK due to bad VCO frequency\n");
		goto sanitize;
	}

	/*
	 * Some BIOS versions leave an incorrect decimal frequency value and
	 * set reserved MBZ bits in CDCLK_CTL at least during exiting from S4,
	 * so sanitize this register.
	 */
	cdctl = intel_de_read(display, CDCLK_CTL);
	expected = bxt_cdclk_ctl(display, &display->cdclk.hw, INVALID_PIPE);

	/*
	 * Let's ignore the pipe field, since BIOS could have configured the
	 * dividers both syncing to an active pipe, or asynchronously
	 * (PIPE_NONE).
	 */
	if (DISPLAY_VER(display) < 30) {
		cdctl &= ~bxt_cdclk_cd2x_pipe_mask(display);
		cdctl |= bxt_cdclk_cd2x_pipe(display, INVALID_PIPE);
	}

	if (cdctl != expected) {
		if (DISPLAY_VER(display) < 20) {
			cdctl &= ~CDCLK_FREQ_DECIMAL_MASK;
			cdctl |= expected & CDCLK_FREQ_DECIMAL_MASK;
		}

		if (cdctl != expected) {
			drm_dbg_kms(display->drm, "Sanitizing CDCLK due to CDCLK_CTL 0x%x, expected 0x%x\n",
				    intel_de_read(display, CDCLK_CTL), expected);
			goto sanitize;
		}

		drm_dbg_kms(display->drm, "Sanitizing CDCLK decimal divider (CDCLK_CTL 0x%x, expected 0x%x)\n",
			    intel_de_read(display, CDCLK_CTL), expected);

		intel_de_write(display, CDCLK_CTL, expected);
	}

	/* All well; nothing to sanitize */
	return;

sanitize:
	/* force cdclk programming */
	display->cdclk.hw.cdclk = 0;

	/* force full PLL disable + enable */
	display->cdclk.hw.vco = ~0;
}

static void bxt_cdclk_init_hw(struct intel_display *display)
{
	struct intel_cdclk_config cdclk_config;

	bxt_sanitize_cdclk(display);

	if (display->cdclk.hw.cdclk != 0 &&
	    display->cdclk.hw.vco != 0)
		return;

	cdclk_config = display->cdclk.hw;

	/*
	 * FIXME:
	 * - The initial CDCLK needs to be read from VBT.
	 *   Need to make this change after VBT has changes for BXT.
	 */
	cdclk_config.cdclk = bxt_calc_cdclk(display, 0);
	cdclk_config.vco = bxt_calc_cdclk_pll_vco(display, cdclk_config.cdclk);
	cdclk_config.voltage_level =
		intel_cdclk_calc_voltage_level(display, cdclk_config.cdclk);

	bxt_set_cdclk(display, &cdclk_config, INVALID_PIPE);
}

static void bxt_cdclk_uninit_hw(struct intel_display *display)
{
	struct intel_cdclk_config cdclk_config = display->cdclk.hw;

	cdclk_config.cdclk = cdclk_config.bypass;
	cdclk_config.vco = 0;
	cdclk_config.voltage_level =
		intel_cdclk_calc_voltage_level(display, cdclk_config.cdclk);

	bxt_set_cdclk(display, &cdclk_config, INVALID_PIPE);
}

/**
 * intel_cdclk_init_hw - Initialize CDCLK hardware
 * @display: display instance
 *
 * Initialize CDCLK. This consists mainly of initializing display->cdclk.hw and
 * sanitizing the state of the hardware if needed. This is generally done only
 * during the display core initialization sequence, after which the DMC will
 * take care of turning CDCLK off/on as needed.
 */
void intel_cdclk_init_hw(struct intel_display *display)
{
	if (DISPLAY_VER(display) >= 10 || display->platform.broxton)
		bxt_cdclk_init_hw(display);
	else if (DISPLAY_VER(display) == 9)
		skl_cdclk_init_hw(display);
}

/**
 * intel_cdclk_uninit_hw - Uninitialize CDCLK hardware
 * @display: display instance
 *
 * Uninitialize CDCLK. This is done only during the display core
 * uninitialization sequence.
 */
void intel_cdclk_uninit_hw(struct intel_display *display)
{
	if (DISPLAY_VER(display) >= 10 || display->platform.broxton)
		bxt_cdclk_uninit_hw(display);
	else if (DISPLAY_VER(display) == 9)
		skl_cdclk_uninit_hw(display);
}

static bool intel_cdclk_can_crawl_and_squash(struct intel_display *display,
					     const struct intel_cdclk_config *a,
					     const struct intel_cdclk_config *b)
{
	u16 old_waveform;
	u16 new_waveform;

	drm_WARN_ON(display->drm, cdclk_pll_is_unknown(a->vco));

	if (a->vco == 0 || b->vco == 0)
		return false;

	if (!HAS_CDCLK_CRAWL(display) || !HAS_CDCLK_SQUASH(display))
		return false;

	old_waveform = cdclk_squash_waveform(display, a->cdclk);
	new_waveform = cdclk_squash_waveform(display, b->cdclk);

	return a->vco != b->vco &&
	       old_waveform != new_waveform;
}

static bool intel_cdclk_can_crawl(struct intel_display *display,
				  const struct intel_cdclk_config *a,
				  const struct intel_cdclk_config *b)
{
	int a_div, b_div;

	if (!HAS_CDCLK_CRAWL(display))
		return false;

	/*
	 * The vco and cd2x divider will change independently
	 * from each, so we disallow cd2x change when crawling.
	 */
	a_div = DIV_ROUND_CLOSEST(a->vco, a->cdclk);
	b_div = DIV_ROUND_CLOSEST(b->vco, b->cdclk);

	return a->vco != 0 && b->vco != 0 &&
		a->vco != b->vco &&
		a_div == b_div &&
		a->ref == b->ref;
}

static bool intel_cdclk_can_squash(struct intel_display *display,
				   const struct intel_cdclk_config *a,
				   const struct intel_cdclk_config *b)
{
	/*
	 * FIXME should store a bit more state in intel_cdclk_config
	 * to differentiate squasher vs. cd2x divider properly. For
	 * the moment all platforms with squasher use a fixed cd2x
	 * divider.
	 */
	if (!HAS_CDCLK_SQUASH(display))
		return false;

	return a->cdclk != b->cdclk &&
		a->vco != 0 &&
		a->vco == b->vco &&
		a->ref == b->ref;
}

/**
 * intel_cdclk_clock_changed - Check whether the clock changed
 * @a: first CDCLK configuration
 * @b: second CDCLK configuration
 *
 * Returns:
 * True if CDCLK changed in a way that requires re-programming and
 * False otherwise.
 */
bool intel_cdclk_clock_changed(const struct intel_cdclk_config *a,
			       const struct intel_cdclk_config *b)
{
	return a->cdclk != b->cdclk ||
		a->vco != b->vco ||
		a->ref != b->ref;
}

/**
 * intel_cdclk_can_cd2x_update - Determine if changing between the two CDCLK
 *                               configurations requires only a cd2x divider update
 * @display: display instance
 * @a: first CDCLK configuration
 * @b: second CDCLK configuration
 *
 * Returns:
 * True if changing between the two CDCLK configurations
 * can be done with just a cd2x divider update, false if not.
 */
static bool intel_cdclk_can_cd2x_update(struct intel_display *display,
					const struct intel_cdclk_config *a,
					const struct intel_cdclk_config *b)
{
	/* Older hw doesn't have the capability */
	if (DISPLAY_VER(display) < 10 && !display->platform.broxton)
		return false;

	/*
	 * FIXME should store a bit more state in intel_cdclk_config
	 * to differentiate squasher vs. cd2x divider properly. For
	 * the moment all platforms with squasher use a fixed cd2x
	 * divider.
	 */
	if (HAS_CDCLK_SQUASH(display))
		return false;

	return a->cdclk != b->cdclk &&
		a->vco != 0 &&
		a->vco == b->vco &&
		a->ref == b->ref;
}

/**
 * intel_cdclk_changed - Determine if two CDCLK configurations are different
 * @a: first CDCLK configuration
 * @b: second CDCLK configuration
 *
 * Returns:
 * True if the CDCLK configurations don't match, false if they do.
 */
static bool intel_cdclk_changed(const struct intel_cdclk_config *a,
				const struct intel_cdclk_config *b)
{
	return intel_cdclk_clock_changed(a, b) ||
		a->voltage_level != b->voltage_level;
}

void intel_cdclk_dump_config(struct intel_display *display,
			     const struct intel_cdclk_config *cdclk_config,
			     const char *context)
{
	drm_dbg_kms(display->drm, "%s %d kHz, VCO %d kHz, ref %d kHz, bypass %d kHz, voltage level %d\n",
		    context, cdclk_config->cdclk, cdclk_config->vco,
		    cdclk_config->ref, cdclk_config->bypass,
		    cdclk_config->voltage_level);
}

static void intel_pcode_notify(struct intel_display *display,
			       u8 voltage_level,
			       u8 active_pipe_count,
			       u16 cdclk,
			       bool cdclk_update_valid,
			       bool pipe_count_update_valid)
{
	int ret;
	u32 update_mask = 0;

	if (!display->platform.dg2)
		return;

	update_mask = DISPLAY_TO_PCODE_UPDATE_MASK(cdclk, active_pipe_count, voltage_level);

	if (cdclk_update_valid)
		update_mask |= DISPLAY_TO_PCODE_CDCLK_VALID;

	if (pipe_count_update_valid)
		update_mask |= DISPLAY_TO_PCODE_PIPE_COUNT_VALID;

	ret = intel_parent_pcode_request(display, SKL_PCODE_CDCLK_CONTROL,
					 SKL_CDCLK_PREPARE_FOR_CHANGE |
					 update_mask,
					 SKL_CDCLK_READY_FOR_CHANGE,
					 SKL_CDCLK_READY_FOR_CHANGE, 3);
	if (ret)
		drm_err(display->drm,
			"Failed to inform PCU about display config (err %d)\n",
			ret);
}

static void intel_set_cdclk(struct intel_display *display,
			    const struct intel_cdclk_config *cdclk_config,
			    enum pipe pipe, const char *context)
{
	struct intel_encoder *encoder;

	if (!intel_cdclk_changed(&display->cdclk.hw, cdclk_config))
		return;

	if (drm_WARN_ON_ONCE(display->drm, !display->cdclk.funcs->set_cdclk))
		return;

	intel_cdclk_dump_config(display, cdclk_config, context);

	for_each_intel_encoder_with_psr(display->drm, encoder) {
		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

		intel_psr_pause(intel_dp);
	}

	intel_audio_cdclk_change_pre(display);

	/*
	 * Lock aux/gmbus while we change cdclk in case those
	 * functions use cdclk. Not all platforms/ports do,
	 * but we'll lock them all for simplicity.
	 */
	mutex_lock(&display->gmbus.mutex);
	for_each_intel_dp(display->drm, encoder) {
		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

		mutex_lock_nest_lock(&intel_dp->aux.hw_mutex,
				     &display->gmbus.mutex);
	}

	intel_cdclk_set_cdclk(display, cdclk_config, pipe);

	for_each_intel_dp(display->drm, encoder) {
		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

		mutex_unlock(&intel_dp->aux.hw_mutex);
	}
	mutex_unlock(&display->gmbus.mutex);

	for_each_intel_encoder_with_psr(display->drm, encoder) {
		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

		intel_psr_resume(intel_dp);
	}

	intel_audio_cdclk_change_post(display);

	if (drm_WARN(display->drm,
		     intel_cdclk_changed(&display->cdclk.hw, cdclk_config),
		     "cdclk state doesn't match!\n")) {
		intel_cdclk_dump_config(display, &display->cdclk.hw, "[hw state]");
		intel_cdclk_dump_config(display, cdclk_config, "[sw state]");
	}
}

static int dg2_power_well_count(struct intel_display *display,
				const struct intel_cdclk_state *cdclk_state)
{
	return display->platform.dg2 ? hweight8(cdclk_state->active_pipes) : 0;
}

static void intel_cdclk_pcode_pre_notify(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);
	const struct intel_cdclk_state *old_cdclk_state =
		intel_atomic_get_old_cdclk_state(state);
	const struct intel_cdclk_state *new_cdclk_state =
		intel_atomic_get_new_cdclk_state(state);
	unsigned int cdclk = 0; u8 voltage_level, num_active_pipes = 0;
	bool change_cdclk, update_pipe_count;

	if (!intel_cdclk_changed(&old_cdclk_state->actual,
				 &new_cdclk_state->actual) &&
	    dg2_power_well_count(display, old_cdclk_state) ==
	    dg2_power_well_count(display, new_cdclk_state))
		return;

	/* According to "Sequence Before Frequency Change", voltage level set to 0x3 */
	voltage_level = DISPLAY_TO_PCODE_VOLTAGE_MAX;

	change_cdclk = new_cdclk_state->actual.cdclk != old_cdclk_state->actual.cdclk;
	update_pipe_count = dg2_power_well_count(display, new_cdclk_state) >
		dg2_power_well_count(display, old_cdclk_state);

	/*
	 * According to "Sequence Before Frequency Change",
	 * if CDCLK is increasing, set bits 25:16 to upcoming CDCLK,
	 * if CDCLK is decreasing or not changing, set bits 25:16 to current CDCLK,
	 * which basically means we choose the maximum of old and new CDCLK, if we know both
	 */
	if (change_cdclk)
		cdclk = max(new_cdclk_state->actual.cdclk, old_cdclk_state->actual.cdclk);

	/*
	 * According to "Sequence For Pipe Count Change",
	 * if pipe count is increasing, set bits 25:16 to upcoming pipe count
	 * (power well is enabled)
	 * no action if it is decreasing, before the change
	 */
	if (update_pipe_count)
		num_active_pipes = dg2_power_well_count(display, new_cdclk_state);

	intel_pcode_notify(display, voltage_level, num_active_pipes, cdclk,
			   change_cdclk, update_pipe_count);
}

static void intel_cdclk_pcode_post_notify(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);
	const struct intel_cdclk_state *new_cdclk_state =
		intel_atomic_get_new_cdclk_state(state);
	const struct intel_cdclk_state *old_cdclk_state =
		intel_atomic_get_old_cdclk_state(state);
	unsigned int cdclk = 0; u8 voltage_level, num_active_pipes = 0;
	bool update_cdclk, update_pipe_count;

	/* According to "Sequence After Frequency Change", set voltage to used level */
	voltage_level = new_cdclk_state->actual.voltage_level;

	update_cdclk = new_cdclk_state->actual.cdclk != old_cdclk_state->actual.cdclk;
	update_pipe_count = dg2_power_well_count(display, new_cdclk_state) <
		dg2_power_well_count(display, old_cdclk_state);

	/*
	 * According to "Sequence After Frequency Change",
	 * set bits 25:16 to current CDCLK
	 */
	if (update_cdclk)
		cdclk = new_cdclk_state->actual.cdclk;

	/*
	 * According to "Sequence For Pipe Count Change",
	 * if pipe count is decreasing, set bits 25:16 to current pipe count,
	 * after the change(power well is disabled)
	 * no action if it is increasing, after the change
	 */
	if (update_pipe_count)
		num_active_pipes = dg2_power_well_count(display, new_cdclk_state);

	intel_pcode_notify(display, voltage_level, num_active_pipes, cdclk,
			   update_cdclk, update_pipe_count);
}

bool intel_cdclk_is_decreasing_later(struct intel_atomic_state *state)
{
	const struct intel_cdclk_state *old_cdclk_state =
		intel_atomic_get_old_cdclk_state(state);
	const struct intel_cdclk_state *new_cdclk_state =
		intel_atomic_get_new_cdclk_state(state);

	return new_cdclk_state && !new_cdclk_state->disable_pipes &&
		new_cdclk_state->actual.cdclk < old_cdclk_state->actual.cdclk;
}

/**
 * intel_set_cdclk_pre_plane_update - Push the CDCLK state to the hardware
 * @state: intel atomic state
 *
 * Program the hardware before updating the HW plane state based on the
 * new CDCLK state, if necessary.
 */
void
intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);
	const struct intel_cdclk_state *old_cdclk_state =
		intel_atomic_get_old_cdclk_state(state);
	const struct intel_cdclk_state *new_cdclk_state =
		intel_atomic_get_new_cdclk_state(state);
	struct intel_cdclk_config cdclk_config;
	enum pipe pipe;

	if (!new_cdclk_state)
		return;

	if (!intel_cdclk_changed(&old_cdclk_state->actual,
				 &new_cdclk_state->actual))
		return;

	if (display->platform.dg2)
		intel_cdclk_pcode_pre_notify(state);

	if (new_cdclk_state->disable_pipes) {
		cdclk_config = new_cdclk_state->actual;
		pipe = INVALID_PIPE;
	} else {
		if (new_cdclk_state->actual.cdclk >= old_cdclk_state->actual.cdclk) {
			cdclk_config = new_cdclk_state->actual;
			pipe = new_cdclk_state->pipe;
		} else {
			cdclk_config = old_cdclk_state->actual;
			pipe = INVALID_PIPE;
		}

		cdclk_config.voltage_level = max(new_cdclk_state->actual.voltage_level,
						 old_cdclk_state->actual.voltage_level);
	}

	/*
	 * mbus joining will be changed later by
	 * intel_dbuf_mbus_{pre,post}_ddb_update()
	 */
	cdclk_config.joined_mbus = old_cdclk_state->actual.joined_mbus;

	drm_WARN_ON(display->drm, !new_cdclk_state->base.changed);

	intel_set_cdclk(display, &cdclk_config, pipe,
			"Pre changing CDCLK to");
}

/**
 * intel_set_cdclk_post_plane_update - Push the CDCLK state to the hardware
 * @state: intel atomic state
 *
 * Program the hardware after updating the HW plane state based on the
 * new CDCLK state, if necessary.
 */
void
intel_set_cdclk_post_plane_update(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);
	const struct intel_cdclk_state *old_cdclk_state =
		intel_atomic_get_old_cdclk_state(state);
	const struct intel_cdclk_state *new_cdclk_state =
		intel_atomic_get_new_cdclk_state(state);
	enum pipe pipe;

	if (!new_cdclk_state)
		return;

	if (!intel_cdclk_changed(&old_cdclk_state->actual,
				 &new_cdclk_state->actual))
		return;

	if (display->platform.dg2)
		intel_cdclk_pcode_post_notify(state);

	if (!new_cdclk_state->disable_pipes &&
	    new_cdclk_state->actual.cdclk < old_cdclk_state->actual.cdclk)
		pipe = new_cdclk_state->pipe;
	else
		pipe = INVALID_PIPE;

	drm_WARN_ON(display->drm, !new_cdclk_state->base.changed);

	intel_set_cdclk(display, &new_cdclk_state->actual, pipe,
			"Post changing CDCLK to");
}

/* pixels per CDCLK */
int intel_cdclk_ppc(struct intel_display *display, bool double_wide)
{
	return HAS_2PPC(display) || double_wide ? 2 : 1;
}

/* max pixel rate as % of CDCLK (not accounting for PPC) */
static int intel_cdclk_guardband(struct intel_display *display)
{
	if (DISPLAY_VER(display) >= 9 ||
	    display->platform.broadwell || display->platform.haswell)
		return 100;
	else if (display->platform.cherryview)
		return 95;
	else
		return 90;
}

static int _intel_pixel_rate_to_cdclk(const struct intel_crtc_state *crtc_state, int pixel_rate)
{
	struct intel_display *display = to_intel_display(crtc_state);
	int ppc = intel_cdclk_ppc(display, crtc_state->double_wide);
	int guardband = intel_cdclk_guardband(display);

	return DIV_ROUND_UP(pixel_rate * 100, guardband * ppc);
}

static int intel_pixel_rate_to_cdclk(const struct intel_crtc_state *crtc_state)
{
	return _intel_pixel_rate_to_cdclk(crtc_state, crtc_state->pixel_rate_cdclk);
}

static int intel_planes_min_cdclk(const struct intel_crtc_state *crtc_state)
{
	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
	struct intel_display *display = to_intel_display(crtc);
	struct intel_plane *plane;
	int min_cdclk = 0;

	for_each_intel_plane_on_crtc(display->drm, crtc, plane)
		min_cdclk = max(min_cdclk, crtc_state->plane_min_cdclk[plane->id]);

	return min_cdclk;
}

int intel_crtc_min_cdclk(const struct intel_crtc_state *crtc_state)
{
	int min_cdclk;

	if (!crtc_state->hw.enable)
		return 0;

	min_cdclk = intel_pixel_rate_to_cdclk(crtc_state);
	min_cdclk = max(min_cdclk, intel_crtc_bw_min_cdclk(crtc_state));
	min_cdclk = max(min_cdclk, intel_fbc_min_cdclk(crtc_state));
	min_cdclk = max(min_cdclk, hsw_ips_min_cdclk(crtc_state));
	min_cdclk = max(min_cdclk, intel_audio_min_cdclk(crtc_state));
	min_cdclk = max(min_cdclk, vlv_dsi_min_cdclk(crtc_state));
	min_cdclk = max(min_cdclk, intel_planes_min_cdclk(crtc_state));
	min_cdclk = max(min_cdclk, intel_vdsc_min_cdclk(crtc_state));

	return min_cdclk;
}

static int intel_cdclk_update_crtc_min_cdclk(struct intel_atomic_state *state,
					     struct intel_crtc *crtc,
					     int old_min_cdclk, int new_min_cdclk,
					     bool *need_cdclk_calc)
{
	struct intel_display *display = to_intel_display(state);
	struct intel_cdclk_state *cdclk_state;
	bool allow_cdclk_decrease = intel_any_crtc_needs_modeset(state);
	int ret;

	if (new_min_cdclk == old_min_cdclk)
		return 0;

	if (!allow_cdclk_decrease && new_min_cdclk < old_min_cdclk)
		return 0;

	cdclk_state = intel_atomic_get_cdclk_state(state);
	if (IS_ERR(cdclk_state))
		return PTR_ERR(cdclk_state);

	old_min_cdclk = cdclk_state->min_cdclk[crtc->pipe];

	if (new_min_cdclk == old_min_cdclk)
		return 0;

	if (!allow_cdclk_decrease && new_min_cdclk < old_min_cdclk)
		return 0;

	cdclk_state->min_cdclk[crtc->pipe] = new_min_cdclk;

	ret = intel_atomic_lock_global_state(&cdclk_state->base);
	if (ret)
		return ret;

	*need_cdclk_calc = true;

	drm_dbg_kms(display->drm,
		    "[CRTC:%d:%s] min cdclk: %d kHz -> %d kHz\n",
		    crtc->base.base.id, crtc->base.name,
		    old_min_cdclk, new_min_cdclk);

	return 0;
}

static int intel_cdclk_update_crtc_min_voltage_level(struct intel_atomic_state *state,
						     struct intel_crtc *crtc,
						     u8 old_min_voltage_level,
						     u8 new_min_voltage_level,
						     bool *need_cdclk_calc)
{
	struct intel_display *display = to_intel_display(state);
	struct intel_cdclk_state *cdclk_state;
	bool allow_voltage_level_decrease = intel_any_crtc_needs_modeset(state);
	int ret;

	if (new_min_voltage_level == old_min_voltage_level)
		return 0;

	if (!allow_voltage_level_decrease &&
	    new_min_voltage_level < old_min_voltage_level)
		return 0;

	cdclk_state = intel_atomic_get_cdclk_state(state);
	if (IS_ERR(cdclk_state))
		return PTR_ERR(cdclk_state);

	old_min_voltage_level = cdclk_state->min_voltage_level[crtc->pipe];

	if (new_min_voltage_level == old_min_voltage_level)
		return 0;

	if (!allow_voltage_level_decrease &&
	    new_min_voltage_level < old_min_voltage_level)
		return 0;

	cdclk_state->min_voltage_level[crtc->pipe] = new_min_voltage_level;

	ret = intel_atomic_lock_global_state(&cdclk_state->base);
	if (ret)
		return ret;

	*need_cdclk_calc = true;

	drm_dbg_kms(display->drm,
		    "[CRTC:%d:%s] min voltage level: %d -> %d\n",
		    crtc->base.base.id, crtc->base.name,
		    old_min_voltage_level, new_min_voltage_level);

	return 0;
}

int intel_cdclk_update_dbuf_bw_min_cdclk(struct intel_atomic_state *state,
					 int old_min_cdclk, int new_min_cdclk,
					 bool *need_cdclk_calc)
{
	struct intel_display *display = to_intel_display(state);
	struct intel_cdclk_state *cdclk_state;
	bool allow_cdclk_decrease = intel_any_crtc_needs_modeset(state);
	int ret;

	if (new_min_cdclk == old_min_cdclk)
		return 0;

	if (!allow_cdclk_decrease && new_min_cdclk < old_min_cdclk)
		return 0;

	cdclk_state = intel_atomic_get_cdclk_state(state);
	if (IS_ERR(cdclk_state))
		return PTR_ERR(cdclk_state);

	old_min_cdclk = cdclk_state->dbuf_bw_min_cdclk;

	if (new_min_cdclk == old_min_cdclk)
		return 0;

	if (!allow_cdclk_decrease && new_min_cdclk < old_min_cdclk)
		return 0;

	cdclk_state->dbuf_bw_min_cdclk = new_min_cdclk;

	ret = intel_atomic_lock_global_state(&cdclk_state->base);
	if (ret)
		return ret;

	*need_cdclk_calc = true;

	drm_dbg_kms(display->drm,
		    "dbuf bandwidth min cdclk: %d kHz -> %d kHz\n",
		    old_min_cdclk, new_min_cdclk);

	return 0;
}

static bool glk_cdclk_audio_wa_needed(struct intel_display *display,
				      const struct intel_cdclk_state *cdclk_state)
{
	return display->platform.geminilake &&
		cdclk_state->enabled_pipes &&
		!is_power_of_2(cdclk_state->enabled_pipes);
}

static int intel_compute_min_cdclk(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);
	struct intel_cdclk_state *cdclk_state =
		intel_atomic_get_new_cdclk_state(state);
	enum pipe pipe;
	int min_cdclk;

	min_cdclk = cdclk_state->force_min_cdclk;
	min_cdclk = max(min_cdclk, cdclk_state->dbuf_bw_min_cdclk);
	for_each_pipe(display, pipe)
		min_cdclk = max(min_cdclk, cdclk_state->min_cdclk[pipe]);

	/*
	 * Avoid glk_force_audio_cdclk() causing excessive screen
	 * blinking when multiple pipes are active by making sure
	 * CDCLK frequency is always high enough for audio. With a
	 * single active pipe we can always change CDCLK frequency
	 * by changing the cd2x divider (see glk_cdclk_table[]) and
	 * thus a full modeset won't be needed then.
	 */
	if (glk_cdclk_audio_wa_needed(display, cdclk_state))
		min_cdclk = max(min_cdclk, 2 * 96000);

	if (min_cdclk > display->cdclk.max_cdclk_freq) {
		drm_dbg_kms(display->drm,
			    "required cdclk (%d kHz) exceeds max (%d kHz)\n",
			    min_cdclk, display->cdclk.max_cdclk_freq);
		return -EINVAL;
	}

	return min_cdclk;
}

/*
 * Account for port clock min voltage level requirements.
 * This only really does something on DISPLA_VER >= 11 but can be
 * called on earlier platforms as well.
 *
 * Note that this functions assumes that 0 is
 * the lowest voltage value, and higher values
 * correspond to increasingly higher voltages.
 *
 * Should that relationship no longer hold on
 * future platforms this code will need to be
 * adjusted.
 */
static int bxt_compute_min_voltage_level(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);
	struct intel_cdclk_state *cdclk_state =
		intel_atomic_get_new_cdclk_state(state);
	struct intel_crtc *crtc;
	struct intel_crtc_state *crtc_state;
	u8 min_voltage_level;
	enum pipe pipe;

	for_each_new_intel_crtc_in_state(state, crtc, crtc_state) {
		int ret;

		if (crtc_state->hw.enable)
			min_voltage_level = crtc_state->min_voltage_level;
		else
			min_voltage_level = 0;

		if (cdclk_state->min_voltage_level[crtc->pipe] == min_voltage_level)
			continue;

		cdclk_state->min_voltage_level[crtc->pipe] = min_voltage_level;

		ret = intel_atomic_lock_global_state(&cdclk_state->base);
		if (ret)
			return ret;
	}

	min_voltage_level = 0;
	for_each_pipe(display, pipe)
		min_voltage_level = max(min_voltage_level,
					cdclk_state->min_voltage_level[pipe]);

	return min_voltage_level;
}

static int vlv_modeset_calc_cdclk(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);
	struct intel_cdclk_state *cdclk_state =
		intel_atomic_get_new_cdclk_state(state);
	int min_cdclk, cdclk;

	min_cdclk = intel_compute_min_cdclk(state);
	if (min_cdclk < 0)
		return min_cdclk;

	cdclk = vlv_calc_cdclk(display, min_cdclk);

	cdclk_state->logical.cdclk = cdclk;
	cdclk_state->logical.voltage_level =
		vlv_calc_voltage_level(display, cdclk);

	if (!cdclk_state->active_pipes) {
		cdclk = vlv_calc_cdclk(display, cdclk_state->force_min_cdclk);

		cdclk_state->actual.cdclk = cdclk;
		cdclk_state->actual.voltage_level =
			vlv_calc_voltage_level(display, cdclk);
	} else {
		cdclk_state->actual = cdclk_state->logical;
	}

	return 0;
}

static int bdw_modeset_calc_cdclk(struct intel_atomic_state *state)
{
	struct intel_cdclk_state *cdclk_state =
		intel_atomic_get_new_cdclk_state(state);
	int min_cdclk, cdclk;

	min_cdclk = intel_compute_min_cdclk(state);
	if (min_cdclk < 0)
		return min_cdclk;

	cdclk = bdw_calc_cdclk(min_cdclk);

	cdclk_state->logical.cdclk = cdclk;
	cdclk_state->logical.voltage_level =
		bdw_calc_voltage_level(cdclk);

	if (!cdclk_state->active_pipes) {
		cdclk = bdw_calc_cdclk(cdclk_state->force_min_cdclk);

		cdclk_state->actual.cdclk = cdclk;
		cdclk_state->actual.voltage_level =
			bdw_calc_voltage_level(cdclk);
	} else {
		cdclk_state->actual = cdclk_state->logical;
	}

	return 0;
}

static int skl_dpll0_vco(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);
	struct intel_cdclk_state *cdclk_state =
		intel_atomic_get_new_cdclk_state(state);
	struct intel_crtc *crtc;
	struct intel_crtc_state *crtc_state;
	int vco;

	vco = cdclk_state->logical.vco;
	if (!vco)
		vco = display->cdclk.skl_preferred_vco_freq;

	for_each_new_intel_crtc_in_state(state, crtc, crtc_state) {
		if (!crtc_state->hw.enable)
			continue;

		if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP))
			continue;

		/*
		 * DPLL0 VCO may need to be adjusted to get the correct
		 * clock for eDP. This will affect cdclk as well.
		 */
		switch (crtc_state->port_clock / 2) {
		case 108000:
		case 216000:
			vco = 8640000;
			break;
		default:
			vco = 8100000;
			break;
		}
	}

	return vco;
}

static int skl_modeset_calc_cdclk(struct intel_atomic_state *state)
{
	struct intel_cdclk_state *cdclk_state =
		intel_atomic_get_new_cdclk_state(state);
	int min_cdclk, cdclk, vco;

	min_cdclk = intel_compute_min_cdclk(state);
	if (min_cdclk < 0)
		return min_cdclk;

	vco = skl_dpll0_vco(state);

	cdclk = skl_calc_cdclk(min_cdclk, vco);

	cdclk_state->logical.vco = vco;
	cdclk_state->logical.cdclk = cdclk;
	cdclk_state->logical.voltage_level =
		skl_calc_voltage_level(cdclk);

	if (!cdclk_state->active_pipes) {
		cdclk = skl_calc_cdclk(cdclk_state->force_min_cdclk, vco);

		cdclk_state->actual.vco = vco;
		cdclk_state->actual.cdclk = cdclk;
		cdclk_state->actual.voltage_level =
			skl_calc_voltage_level(cdclk);
	} else {
		cdclk_state->actual = cdclk_state->logical;
	}

	return 0;
}

static int bxt_modeset_calc_cdclk(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);
	struct intel_cdclk_state *cdclk_state =
		intel_atomic_get_new_cdclk_state(state);
	int min_cdclk, min_voltage_level, cdclk, vco;

	min_cdclk = intel_compute_min_cdclk(state);
	if (min_cdclk < 0)
		return min_cdclk;

	min_voltage_level = bxt_compute_min_voltage_level(state);
	if (min_voltage_level < 0)
		return min_voltage_level;

	cdclk = bxt_calc_cdclk(display, min_cdclk);
	vco = bxt_calc_cdclk_pll_vco(display, cdclk);

	cdclk_state->logical.vco = vco;
	cdclk_state->logical.cdclk = cdclk;
	cdclk_state->logical.voltage_level =
		max_t(int, min_voltage_level,
		      intel_cdclk_calc_voltage_level(display, cdclk));

	if (!cdclk_state->active_pipes) {
		cdclk = bxt_calc_cdclk(display, cdclk_state->force_min_cdclk);
		vco = bxt_calc_cdclk_pll_vco(display, cdclk);

		cdclk_state->actual.vco = vco;
		cdclk_state->actual.cdclk = cdclk;
		cdclk_state->actual.voltage_level =
			intel_cdclk_calc_voltage_level(display, cdclk);
	} else {
		cdclk_state->actual = cdclk_state->logical;
	}

	return 0;
}

static int fixed_modeset_calc_cdclk(struct intel_atomic_state *state)
{
	int min_cdclk;

	/*
	 * We can't change the cdclk frequency, but we still want to
	 * check that the required minimum frequency doesn't exceed
	 * the actual cdclk frequency.
	 */
	min_cdclk = intel_compute_min_cdclk(state);
	if (min_cdclk < 0)
		return min_cdclk;

	return 0;
}

static struct intel_global_state *intel_cdclk_duplicate_state(struct intel_global_obj *obj)
{
	struct intel_cdclk_state *cdclk_state;

	cdclk_state = kmemdup(obj->state, sizeof(*cdclk_state), GFP_KERNEL);
	if (!cdclk_state)
		return NULL;

	cdclk_state->pipe = INVALID_PIPE;
	cdclk_state->disable_pipes = false;

	return &cdclk_state->base;
}

static void intel_cdclk_destroy_state(struct intel_global_obj *obj,
				      struct intel_global_state *state)
{
	kfree(state);
}

static const struct intel_global_state_funcs intel_cdclk_funcs = {
	.atomic_duplicate_state = intel_cdclk_duplicate_state,
	.atomic_destroy_state = intel_cdclk_destroy_state,
};

struct intel_cdclk_state *
intel_atomic_get_cdclk_state(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);
	struct intel_global_state *cdclk_state;

	cdclk_state = intel_atomic_get_global_obj_state(state, &display->cdclk.obj);
	if (IS_ERR(cdclk_state))
		return ERR_CAST(cdclk_state);

	return to_intel_cdclk_state(cdclk_state);
}

static int intel_cdclk_modeset_checks(struct intel_atomic_state *state,
				      bool *need_cdclk_calc)
{
	struct intel_display *display = to_intel_display(state);
	const struct intel_cdclk_state *old_cdclk_state;
	struct intel_cdclk_state *new_cdclk_state;
	int ret;

	if (!intel_any_crtc_enable_changed(state) &&
	    !intel_any_crtc_active_changed(state))
		return 0;

	new_cdclk_state = intel_atomic_get_cdclk_state(state);
	if (IS_ERR(new_cdclk_state))
		return PTR_ERR(new_cdclk_state);

	old_cdclk_state = intel_atomic_get_old_cdclk_state(state);

	new_cdclk_state->enabled_pipes =
		intel_calc_enabled_pipes(state, old_cdclk_state->enabled_pipes);

	new_cdclk_state->active_pipes =
		intel_calc_active_pipes(state, old_cdclk_state->active_pipes);

	ret = intel_atomic_lock_global_state(&new_cdclk_state->base);
	if (ret)
		return ret;

	if (!old_cdclk_state->active_pipes != !new_cdclk_state->active_pipes)
		*need_cdclk_calc = true;

	if (glk_cdclk_audio_wa_needed(display, old_cdclk_state) !=
	    glk_cdclk_audio_wa_needed(display, new_cdclk_state))
		*need_cdclk_calc = true;

	if (dg2_power_well_count(display, old_cdclk_state) !=
	    dg2_power_well_count(display, new_cdclk_state))
		*need_cdclk_calc = true;

	return 0;
}

static int intel_crtcs_calc_min_cdclk(struct intel_atomic_state *state,
				      bool *need_cdclk_calc)
{
	const struct intel_crtc_state *old_crtc_state;
	const struct intel_crtc_state *new_crtc_state;
	struct intel_crtc *crtc;
	int ret;

	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state) {
		ret = intel_cdclk_update_crtc_min_cdclk(state, crtc,
							old_crtc_state->min_cdclk,
							new_crtc_state->min_cdclk,
							need_cdclk_calc);
		if (ret)
			return ret;

		ret = intel_cdclk_update_crtc_min_voltage_level(state, crtc,
								old_crtc_state->min_voltage_level,
								new_crtc_state->min_voltage_level,
								need_cdclk_calc);
		if (ret)
			return ret;
	}

	return 0;
}

int intel_cdclk_state_set_joined_mbus(struct intel_atomic_state *state, bool joined_mbus)
{
	struct intel_cdclk_state *cdclk_state;

	cdclk_state = intel_atomic_get_cdclk_state(state);
	if (IS_ERR(cdclk_state))
		return PTR_ERR(cdclk_state);

	cdclk_state->actual.joined_mbus = joined_mbus;
	cdclk_state->logical.joined_mbus = joined_mbus;

	return intel_atomic_lock_global_state(&cdclk_state->base);
}

int intel_cdclk_init(struct intel_display *display)
{
	struct intel_cdclk_state *cdclk_state;

	cdclk_state = kzalloc_obj(*cdclk_state);
	if (!cdclk_state)
		return -ENOMEM;

	intel_atomic_global_obj_init(display, &display->cdclk.obj,
				     &cdclk_state->base, &intel_cdclk_funcs);

	return 0;
}

static bool intel_cdclk_need_serialize(struct intel_display *display,
				       const struct intel_cdclk_state *old_cdclk_state,
				       const struct intel_cdclk_state *new_cdclk_state)
{
	/*
	 * We need to poke hw for DG2, because we notify PCode if
	 * pipe power well count changes.
	 */
	return intel_cdclk_changed(&old_cdclk_state->actual,
				   &new_cdclk_state->actual) ||
		dg2_power_well_count(display, old_cdclk_state) !=
		dg2_power_well_count(display, new_cdclk_state);
}

static int intel_modeset_calc_cdclk(struct intel_atomic_state *state)
{
	struct intel_display *display = to_intel_display(state);
	const struct intel_cdclk_state *old_cdclk_state;
	struct intel_cdclk_state *new_cdclk_state;
	enum pipe pipe = INVALID_PIPE;
	int ret;

	new_cdclk_state = intel_atomic_get_cdclk_state(state);
	if (IS_ERR(new_cdclk_state))
		return PTR_ERR(new_cdclk_state);

	old_cdclk_state = intel_atomic_get_old_cdclk_state(state);

	ret = intel_cdclk_modeset_calc_cdclk(state);
	if (ret)
		return ret;

	if (intel_cdclk_need_serialize(display, old_cdclk_state, new_cdclk_state)) {
		/*
		 * Also serialize commits across all crtcs
		 * if the actual hw needs to be poked.
		 */
		ret = intel_atomic_serialize_global_state(&new_cdclk_state->base);
		if (ret)
			return ret;
	} else if (intel_cdclk_changed(&old_cdclk_state->logical,
				       &new_cdclk_state->logical)) {
		ret = intel_atomic_lock_global_state(&new_cdclk_state->base);
		if (ret)
			return ret;
	} else {
		return 0;
	}

	if (is_power_of_2(new_cdclk_state->active_pipes) &&
	    intel_cdclk_can_cd2x_update(display,
					&old_cdclk_state->actual,
					&new_cdclk_state->actual)) {
		struct intel_crtc *crtc;
		struct intel_crtc_state *crtc_state;

		pipe = ilog2(new_cdclk_state->active_pipes);
		crtc = intel_crtc_for_pipe(display, pipe);

		crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
		if (IS_ERR(crtc_state))
			return PTR_ERR(crtc_state);

		if (intel_crtc_needs_modeset(crtc_state))
			pipe = INVALID_PIPE;
	}

	if (intel_cdclk_can_crawl_and_squash(display,
					     &old_cdclk_state->actual,
					     &new_cdclk_state->actual)) {
		drm_dbg_kms(display->drm,
			    "Can change cdclk via crawling and squashing\n");
	} else if (intel_cdclk_can_squash(display,
					&old_cdclk_state->actual,
					&new_cdclk_state->actual)) {
		drm_dbg_kms(display->drm,
			    "Can change cdclk via squashing\n");
	} else if (intel_cdclk_can_crawl(display,
					 &old_cdclk_state->actual,
					 &new_cdclk_state->actual)) {
		drm_dbg_kms(display->drm,
			    "Can change cdclk via crawling\n");
	} else if (pipe != INVALID_PIPE) {
		new_cdclk_state->pipe = pipe;

		drm_dbg_kms(display->drm,
			    "Can change cdclk cd2x divider with pipe %c active\n",
			    pipe_name(pipe));
	} else if (intel_cdclk_clock_changed(&old_cdclk_state->actual,
					     &new_cdclk_state->actual)) {
		/* All pipes must be switched off while we change the cdclk. */
		ret = intel_modeset_all_pipes_late(state, "CDCLK change");
		if (ret)
			return ret;

		new_cdclk_state->disable_pipes = true;

		drm_dbg_kms(display->drm,
			    "Modeset required for cdclk change\n");
	}

	if (intel_mdclk_cdclk_ratio(display, &old_cdclk_state->actual) !=
	    intel_mdclk_cdclk_ratio(display, &new_cdclk_state->actual)) {
		int ratio = intel_mdclk_cdclk_ratio(display, &new_cdclk_state->actual);

		ret = intel_dbuf_state_set_mdclk_cdclk_ratio(state, ratio);
		if (ret)
			return ret;
	}

	drm_dbg_kms(display->drm,
		    "New cdclk calculated to be logical %u kHz, actual %u kHz\n",
		    new_cdclk_state->logical.cdclk,
		    new_cdclk_state->actual.cdclk);
	drm_dbg_kms(display->drm,
		    "New voltage level calculated to be logical %u, actual %u\n",
		    new_cdclk_state->logical.voltage_level,
		    new_cdclk_state->actual.voltage_level);

	return 0;
}

int intel_cdclk_atomic_check(struct intel_atomic_state *state)
{
	const struct intel_cdclk_state *old_cdclk_state;
	struct intel_cdclk_state *new_cdclk_state;
	bool need_cdclk_calc = false;
	int ret;

	ret = intel_cdclk_modeset_checks(state, &need_cdclk_calc);
	if (ret)
		return ret;

	ret = intel_crtcs_calc_min_cdclk(state, &need_cdclk_calc);
	if (ret)
		return ret;

	ret = intel_dbuf_bw_calc_min_cdclk(state, &need_cdclk_calc);
	if (ret)
		return ret;

	old_cdclk_state = intel_atomic_get_old_cdclk_state(state);
	new_cdclk_state = intel_atomic_get_new_cdclk_state(state);

	if (new_cdclk_state &&
	    old_cdclk_state->force_min_cdclk != new_cdclk_state->force_min_cdclk) {
		ret = intel_atomic_lock_global_state(&new_cdclk_state->base);
		if (ret)
			return ret;

		need_cdclk_calc = true;
	}

	if (need_cdclk_calc) {
		ret = intel_modeset_calc_cdclk(state);
		if (ret)
			return ret;
	}

	return 0;
}

void intel_cdclk_update_hw_state(struct intel_display *display)
{
	const struct intel_dbuf_bw_state *dbuf_bw_state =
		to_intel_dbuf_bw_state(display->dbuf_bw.obj.state);
	struct intel_cdclk_state *cdclk_state =
		to_intel_cdclk_state(display->cdclk.obj.state);
	struct intel_crtc *crtc;

	cdclk_state->enabled_pipes = 0;
	cdclk_state->active_pipes = 0;

	for_each_intel_crtc(display, crtc) {
		const struct intel_crtc_state *crtc_state =
			to_intel_crtc_state(crtc->base.state);
		enum pipe pipe = crtc->pipe;

		if (crtc_state->hw.enable)
			cdclk_state->enabled_pipes |= BIT(pipe);
		if (crtc_state->hw.active)
			cdclk_state->active_pipes |= BIT(pipe);

		cdclk_state->min_cdclk[pipe] = crtc_state->min_cdclk;
		cdclk_state->min_voltage_level[pipe] = crtc_state->min_voltage_level;
	}

	cdclk_state->dbuf_bw_min_cdclk = intel_dbuf_bw_min_cdclk(display, dbuf_bw_state);
}

void intel_cdclk_crtc_disable_noatomic(struct intel_crtc *crtc)
{
	struct intel_display *display = to_intel_display(crtc);

	intel_cdclk_update_hw_state(display);
}

static int intel_compute_max_dotclk(struct intel_display *display)
{
	int ppc = intel_cdclk_ppc(display, HAS_DOUBLE_WIDE(display));
	int guardband = intel_cdclk_guardband(display);
	int max_cdclk_freq = display->cdclk.max_cdclk_freq;

	return ppc * max_cdclk_freq * guardband / 100;
}

/**
 * intel_update_max_cdclk - Determine the maximum support CDCLK frequency
 * @display: display instance
 *
 * Determine the maximum CDCLK frequency the platform supports, and also
 * derive the maximum dot clock frequency the maximum CDCLK frequency
 * allows.
 */
void intel_update_max_cdclk(struct intel_display *display)
{
	if (DISPLAY_VER(display) >= 35) {
		display->cdclk.max_cdclk_freq = 787200;
	} else if (DISPLAY_VERx100(display) >= 3002) {
		display->cdclk.max_cdclk_freq = 480000;
	} else if (DISPLAY_VER(display) >= 30) {
		display->cdclk.max_cdclk_freq = 691200;
	} else if (display->platform.jasperlake || display->platform.elkhartlake) {
		if (display->cdclk.hw.ref == 24000)
			display->cdclk.max_cdclk_freq = 552000;
		else
			display->cdclk.max_cdclk_freq = 556800;
	} else if (DISPLAY_VER(display) >= 11) {
		if (display->cdclk.hw.ref == 24000)
			display->cdclk.max_cdclk_freq = 648000;
		else
			display->cdclk.max_cdclk_freq = 652800;
	} else if (display->platform.geminilake) {
		display->cdclk.max_cdclk_freq = 316800;
	} else if (display->platform.broxton) {
		display->cdclk.max_cdclk_freq = 624000;
	} else if (DISPLAY_VER(display) == 9) {
		u32 limit = intel_de_read(display, SKL_DFSM) & SKL_DFSM_CDCLK_LIMIT_MASK;
		int max_cdclk, vco;

		vco = display->cdclk.skl_preferred_vco_freq;
		drm_WARN_ON(display->drm, vco != 8100000 && vco != 8640000);

		/*
		 * Use the lower (vco 8640) cdclk values as a
		 * first guess. skl_calc_cdclk() will correct it
		 * if the preferred vco is 8100 instead.
		 */
		if (limit == SKL_DFSM_CDCLK_LIMIT_675)
			max_cdclk = 617143;
		else if (limit == SKL_DFSM_CDCLK_LIMIT_540)
			max_cdclk = 540000;
		else if (limit == SKL_DFSM_CDCLK_LIMIT_450)
			max_cdclk = 432000;
		else
			max_cdclk = 308571;

		display->cdclk.max_cdclk_freq = skl_calc_cdclk(max_cdclk, vco);
	} else if (display->platform.broadwell)  {
		/*
		 * FIXME with extra cooling we can allow
		 * 540 MHz for ULX and 675 Mhz for ULT.
		 * How can we know if extra cooling is
		 * available? PCI ID, VTB, something else?
		 */
		if (intel_de_read(display, FUSE_STRAP) & HSW_CDCLK_LIMIT)
			display->cdclk.max_cdclk_freq = 450000;
		else if (display->platform.broadwell_ulx)
			display->cdclk.max_cdclk_freq = 450000;
		else if (display->platform.broadwell_ult)
			display->cdclk.max_cdclk_freq = 540000;
		else
			display->cdclk.max_cdclk_freq = 675000;
	} else if (display->platform.cherryview) {
		display->cdclk.max_cdclk_freq = 320000;
	} else if (display->platform.valleyview) {
		display->cdclk.max_cdclk_freq = 400000;
	} else {
		/* otherwise assume cdclk is fixed */
		display->cdclk.max_cdclk_freq = display->cdclk.hw.cdclk;
	}

	display->cdclk.max_dotclk_freq = intel_compute_max_dotclk(display);

	drm_dbg(display->drm, "Max CD clock rate: %d kHz\n",
		display->cdclk.max_cdclk_freq);

	drm_dbg(display->drm, "Max dotclock rate: %d kHz\n",
		display->cdclk.max_dotclk_freq);
}

/**
 * intel_update_cdclk - Determine the current CDCLK frequency
 * @display: display instance
 *
 * Determine the current CDCLK frequency.
 */
void intel_update_cdclk(struct intel_display *display)
{
	intel_cdclk_get_cdclk(display, &display->cdclk.hw);

	/*
	 * 9:0 CMBUS [sic] CDCLK frequency (cdfreq):
	 * Programmng [sic] note: bit[9:2] should be programmed to the number
	 * of cdclk that generates 4MHz reference clock freq which is used to
	 * generate GMBus clock. This will vary with the cdclk freq.
	 */
	if (display->platform.valleyview || display->platform.cherryview)
		intel_de_write(display, GMBUSFREQ_VLV,
			       DIV_ROUND_UP(display->cdclk.hw.cdclk, 1000));
}

static int dg1_rawclk(struct intel_display *display)
{
	/*
	 * DG1 always uses a 38.4 MHz rawclk.  The bspec tells us
	 * "Program Numerator=2, Denominator=4, Divider=37 decimal."
	 */
	intel_de_write(display, PCH_RAWCLK_FREQ,
		       CNP_RAWCLK_DEN(4) | CNP_RAWCLK_DIV(37) | ICP_RAWCLK_NUM(2));

	return 38400;
}

static int cnp_rawclk(struct intel_display *display)
{
	int divider, fraction;
	u32 rawclk;

	if (intel_de_read(display, SFUSE_STRAP) & SFUSE_STRAP_RAW_FREQUENCY) {
		/* 24 MHz */
		divider = 24000;
		fraction = 0;
	} else {
		/* 19.2 MHz */
		divider = 19000;
		fraction = 200;
	}

	rawclk = CNP_RAWCLK_DIV(divider / 1000);
	if (fraction) {
		int numerator = 1;

		rawclk |= CNP_RAWCLK_DEN(DIV_ROUND_CLOSEST(numerator * 1000,
							   fraction) - 1);
		if (INTEL_PCH_TYPE(display) >= PCH_ICP)
			rawclk |= ICP_RAWCLK_NUM(numerator);
	}

	intel_de_write(display, PCH_RAWCLK_FREQ, rawclk);
	return divider + fraction;
}

static int pch_rawclk(struct intel_display *display)
{
	return (intel_de_read(display, PCH_RAWCLK_FREQ) & RAWCLK_FREQ_MASK) * 1000;
}

static int i9xx_hrawclk(struct intel_display *display)
{
	/* hrawclock is 1/4 the FSB frequency */
	return DIV_ROUND_CLOSEST(intel_fsb_freq(display), 4);
}

/**
 * intel_read_rawclk - Determine the current RAWCLK frequency
 * @display: display instance
 *
 * Determine the current RAWCLK frequency. RAWCLK is a fixed
 * frequency clock so this needs to done only once.
 */
u32 intel_read_rawclk(struct intel_display *display)
{
	u32 freq;

	if (INTEL_PCH_TYPE(display) >= PCH_MTL)
		/*
		 * MTL always uses a 38.4 MHz rawclk.  The bspec tells us
		 * "RAWCLK_FREQ defaults to the values for 38.4 and does
		 * not need to be programmed."
		 */
		freq = 38400;
	else if (INTEL_PCH_TYPE(display) >= PCH_DG1)
		freq = dg1_rawclk(display);
	else if (INTEL_PCH_TYPE(display) >= PCH_CNP)
		freq = cnp_rawclk(display);
	else if (HAS_PCH_SPLIT(display))
		freq = pch_rawclk(display);
	else if (display->platform.valleyview || display->platform.cherryview)
		freq = vlv_clock_get_hrawclk(display->drm);
	else if (DISPLAY_VER(display) >= 3)
		freq = i9xx_hrawclk(display);
	else
		/* no rawclk on other platforms, or no need to know it */
		return 0;

	return freq;
}

static int i915_cdclk_info_show(struct seq_file *m, void *unused)
{
	struct intel_display *display = m->private;

	seq_printf(m, "Current CD clock frequency: %d kHz\n", display->cdclk.hw.cdclk);
	seq_printf(m, "Max CD clock frequency: %d kHz\n", display->cdclk.max_cdclk_freq);
	seq_printf(m, "Max pixel clock frequency: %d kHz\n", display->cdclk.max_dotclk_freq);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(i915_cdclk_info);

void intel_cdclk_debugfs_register(struct intel_display *display)
{
	debugfs_create_file("i915_cdclk_info", 0444, display->drm->debugfs_root,
			    display, &i915_cdclk_info_fops);
}

static const struct intel_cdclk_funcs xe3lpd_cdclk_funcs = {
	.get_cdclk = bxt_get_cdclk,
	.set_cdclk = bxt_set_cdclk,
	.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
	.calc_voltage_level = xe3lpd_calc_voltage_level,
};

static const struct intel_cdclk_funcs rplu_cdclk_funcs = {
	.get_cdclk = bxt_get_cdclk,
	.set_cdclk = bxt_set_cdclk,
	.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
	.calc_voltage_level = rplu_calc_voltage_level,
};

static const struct intel_cdclk_funcs tgl_cdclk_funcs = {
	.get_cdclk = bxt_get_cdclk,
	.set_cdclk = bxt_set_cdclk,
	.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
	.calc_voltage_level = tgl_calc_voltage_level,
};

static const struct intel_cdclk_funcs ehl_cdclk_funcs = {
	.get_cdclk = bxt_get_cdclk,
	.set_cdclk = bxt_set_cdclk,
	.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
	.calc_voltage_level = ehl_calc_voltage_level,
};

static const struct intel_cdclk_funcs icl_cdclk_funcs = {
	.get_cdclk = bxt_get_cdclk,
	.set_cdclk = bxt_set_cdclk,
	.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
	.calc_voltage_level = icl_calc_voltage_level,
};

static const struct intel_cdclk_funcs bxt_cdclk_funcs = {
	.get_cdclk = bxt_get_cdclk,
	.set_cdclk = bxt_set_cdclk,
	.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
	.calc_voltage_level = bxt_calc_voltage_level,
};

static const struct intel_cdclk_funcs skl_cdclk_funcs = {
	.get_cdclk = skl_get_cdclk,
	.set_cdclk = skl_set_cdclk,
	.modeset_calc_cdclk = skl_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs bdw_cdclk_funcs = {
	.get_cdclk = bdw_get_cdclk,
	.set_cdclk = bdw_set_cdclk,
	.modeset_calc_cdclk = bdw_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs chv_cdclk_funcs = {
	.get_cdclk = vlv_get_cdclk,
	.set_cdclk = chv_set_cdclk,
	.modeset_calc_cdclk = vlv_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs vlv_cdclk_funcs = {
	.get_cdclk = vlv_get_cdclk,
	.set_cdclk = vlv_set_cdclk,
	.modeset_calc_cdclk = vlv_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs hsw_cdclk_funcs = {
	.get_cdclk = hsw_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

/* SNB, IVB, 965G, 945G */
static const struct intel_cdclk_funcs fixed_400mhz_cdclk_funcs = {
	.get_cdclk = fixed_400mhz_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs ilk_cdclk_funcs = {
	.get_cdclk = fixed_450mhz_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs gm45_cdclk_funcs = {
	.get_cdclk = gm45_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

/* G45 uses G33 */

static const struct intel_cdclk_funcs i965gm_cdclk_funcs = {
	.get_cdclk = i965gm_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

/* i965G uses fixed 400 */

static const struct intel_cdclk_funcs pnv_cdclk_funcs = {
	.get_cdclk = pnv_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs g33_cdclk_funcs = {
	.get_cdclk = g33_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs i945gm_cdclk_funcs = {
	.get_cdclk = i945gm_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

/* i945G uses fixed 400 */

static const struct intel_cdclk_funcs i915gm_cdclk_funcs = {
	.get_cdclk = i915gm_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs i915g_cdclk_funcs = {
	.get_cdclk = fixed_333mhz_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs i865g_cdclk_funcs = {
	.get_cdclk = fixed_266mhz_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs i85x_cdclk_funcs = {
	.get_cdclk = i85x_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs i845g_cdclk_funcs = {
	.get_cdclk = fixed_200mhz_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

static const struct intel_cdclk_funcs i830_cdclk_funcs = {
	.get_cdclk = fixed_133mhz_get_cdclk,
	.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};

/**
 * intel_init_cdclk_hooks - Initialize CDCLK related modesetting hooks
 * @display: display instance
 */
void intel_init_cdclk_hooks(struct intel_display *display)
{
	if (DISPLAY_VER(display) >= 35) {
		display->cdclk.funcs = &xe3lpd_cdclk_funcs;
		display->cdclk.table = xe3p_lpd_cdclk_table;
	} else if (DISPLAY_VER(display) >= 30) {
		display->cdclk.funcs = &xe3lpd_cdclk_funcs;
		display->cdclk.table = xe3lpd_cdclk_table;
	} else if (DISPLAY_VER(display) >= 20) {
		display->cdclk.funcs = &rplu_cdclk_funcs;
		display->cdclk.table = xe2lpd_cdclk_table;
	} else if (DISPLAY_VERx100(display) >= 1401) {
		display->cdclk.funcs = &rplu_cdclk_funcs;
		display->cdclk.table = xe2hpd_cdclk_table;
	} else if (DISPLAY_VER(display) >= 14) {
		display->cdclk.funcs = &rplu_cdclk_funcs;
		display->cdclk.table = mtl_cdclk_table;
	} else if (display->platform.dg2) {
		display->cdclk.funcs = &tgl_cdclk_funcs;
		display->cdclk.table = dg2_cdclk_table;
	} else if (display->platform.alderlake_p) {
		/* Wa_22011320316:adl-p[a0] */
		if (intel_display_wa(display, INTEL_DISPLAY_WA_22011320316)) {
			display->cdclk.table = adlp_a_step_cdclk_table;
			display->cdclk.funcs = &tgl_cdclk_funcs;
		} else if (display->platform.alderlake_p_raptorlake_u) {
			display->cdclk.table = rplu_cdclk_table;
			display->cdclk.funcs = &rplu_cdclk_funcs;
		} else {
			display->cdclk.table = adlp_cdclk_table;
			display->cdclk.funcs = &tgl_cdclk_funcs;
		}
	} else if (display->platform.rocketlake) {
		display->cdclk.funcs = &tgl_cdclk_funcs;
		display->cdclk.table = rkl_cdclk_table;
	} else if (DISPLAY_VER(display) >= 12) {
		display->cdclk.funcs = &tgl_cdclk_funcs;
		display->cdclk.table = icl_cdclk_table;
	} else if (display->platform.jasperlake || display->platform.elkhartlake) {
		display->cdclk.funcs = &ehl_cdclk_funcs;
		display->cdclk.table = icl_cdclk_table;
	} else if (DISPLAY_VER(display) >= 11) {
		display->cdclk.funcs = &icl_cdclk_funcs;
		display->cdclk.table = icl_cdclk_table;
	} else if (display->platform.geminilake || display->platform.broxton) {
		display->cdclk.funcs = &bxt_cdclk_funcs;
		if (display->platform.geminilake)
			display->cdclk.table = glk_cdclk_table;
		else
			display->cdclk.table = bxt_cdclk_table;
	} else if (DISPLAY_VER(display) == 9) {
		display->cdclk.funcs = &skl_cdclk_funcs;
	} else if (display->platform.broadwell) {
		display->cdclk.funcs = &bdw_cdclk_funcs;
	} else if (display->platform.haswell) {
		display->cdclk.funcs = &hsw_cdclk_funcs;
	} else if (display->platform.cherryview) {
		display->cdclk.funcs = &chv_cdclk_funcs;
	} else if (display->platform.valleyview) {
		display->cdclk.funcs = &vlv_cdclk_funcs;
	} else if (display->platform.sandybridge || display->platform.ivybridge) {
		display->cdclk.funcs = &fixed_400mhz_cdclk_funcs;
	} else if (display->platform.ironlake) {
		display->cdclk.funcs = &ilk_cdclk_funcs;
	} else if (display->platform.gm45) {
		display->cdclk.funcs = &gm45_cdclk_funcs;
	} else if (display->platform.g45) {
		display->cdclk.funcs = &g33_cdclk_funcs;
	} else if (display->platform.i965gm) {
		display->cdclk.funcs = &i965gm_cdclk_funcs;
	} else if (display->platform.i965g) {
		display->cdclk.funcs = &fixed_400mhz_cdclk_funcs;
	} else if (display->platform.pineview) {
		display->cdclk.funcs = &pnv_cdclk_funcs;
	} else if (display->platform.g33) {
		display->cdclk.funcs = &g33_cdclk_funcs;
	} else if (display->platform.i945gm) {
		display->cdclk.funcs = &i945gm_cdclk_funcs;
	} else if (display->platform.i945g) {
		display->cdclk.funcs = &fixed_400mhz_cdclk_funcs;
	} else if (display->platform.i915gm) {
		display->cdclk.funcs = &i915gm_cdclk_funcs;
	} else if (display->platform.i915g) {
		display->cdclk.funcs = &i915g_cdclk_funcs;
	} else if (display->platform.i865g) {
		display->cdclk.funcs = &i865g_cdclk_funcs;
	} else if (display->platform.i85x) {
		display->cdclk.funcs = &i85x_cdclk_funcs;
	} else if (display->platform.i845g) {
		display->cdclk.funcs = &i845g_cdclk_funcs;
	} else if (display->platform.i830) {
		display->cdclk.funcs = &i830_cdclk_funcs;
	}

	if (drm_WARN(display->drm, !display->cdclk.funcs,
		     "Unknown platform. Assuming i830\n"))
		display->cdclk.funcs = &i830_cdclk_funcs;
}

int intel_cdclk_logical(const struct intel_cdclk_state *cdclk_state)
{
	return cdclk_state->logical.cdclk;
}

int intel_cdclk_actual(const struct intel_cdclk_state *cdclk_state)
{
	return cdclk_state->actual.cdclk;
}

int intel_cdclk_actual_voltage_level(const struct intel_cdclk_state *cdclk_state)
{
	return cdclk_state->actual.voltage_level;
}

int intel_cdclk_min_cdclk(const struct intel_cdclk_state *cdclk_state, enum pipe pipe)
{
	return cdclk_state->min_cdclk[pipe];
}

bool intel_cdclk_pmdemand_needs_update(struct intel_atomic_state *state)
{
	const struct intel_cdclk_state *new_cdclk_state, *old_cdclk_state;

	new_cdclk_state = intel_atomic_get_new_cdclk_state(state);
	old_cdclk_state = intel_atomic_get_old_cdclk_state(state);

	if (new_cdclk_state &&
	    (new_cdclk_state->actual.cdclk != old_cdclk_state->actual.cdclk ||
	     new_cdclk_state->actual.voltage_level != old_cdclk_state->actual.voltage_level))
		return true;

	return false;
}

void intel_cdclk_force_min_cdclk(struct intel_cdclk_state *cdclk_state, int force_min_cdclk)
{
	cdclk_state->force_min_cdclk = force_min_cdclk;
}

void intel_cdclk_read_hw(struct intel_display *display)
{
	struct intel_cdclk_state *cdclk_state;

	cdclk_state = to_intel_cdclk_state(display->cdclk.obj.state);

	intel_update_cdclk(display);
	intel_cdclk_dump_config(display, &display->cdclk.hw, "Current CDCLK");
	cdclk_state->actual = display->cdclk.hw;
	cdclk_state->logical = display->cdclk.hw;
}

static int calc_cdclk(const struct intel_crtc_state *crtc_state, int min_cdclk)
{
	struct intel_display *display = to_intel_display(crtc_state);

	if (DISPLAY_VER(display) >= 10 || display->platform.broxton) {
		return bxt_calc_cdclk(display, min_cdclk);
	} else if (DISPLAY_VER(display) == 9) {
		int vco;

		vco = display->cdclk.skl_preferred_vco_freq;
		if (vco == 0)
			vco = 8100000;

		return skl_calc_cdclk(min_cdclk, vco);
	} else if (display->platform.broadwell) {
		return bdw_calc_cdclk(min_cdclk);
	} else if (display->platform.cherryview || display->platform.valleyview) {
		return vlv_calc_cdclk(display, min_cdclk);
	} else {
		return display->cdclk.max_cdclk_freq;
	}
}

static unsigned int _intel_cdclk_prefill_adj(const struct intel_crtc_state *crtc_state,
					     int clock, int min_cdclk)
{
	struct intel_display *display = to_intel_display(crtc_state);
	int ppc = intel_cdclk_ppc(display, crtc_state->double_wide);
	int cdclk = calc_cdclk(crtc_state, min_cdclk);

	return min(0x10000, DIV_ROUND_UP_ULL((u64)clock << 16, ppc * cdclk));
}

unsigned int intel_cdclk_prefill_adjustment(const struct intel_crtc_state *crtc_state)
{
	/* FIXME use the actual min_cdclk for the pipe here */
	return intel_cdclk_prefill_adjustment_worst(crtc_state);
}

unsigned int intel_cdclk_prefill_adjustment_worst(const struct intel_crtc_state *crtc_state)
{
	int clock = crtc_state->hw.pipe_mode.crtc_clock;
	int min_cdclk;

	/*
	 * FIXME could perhaps consider a few more of the factors
	 * that go the per-crtc min_cdclk. Namely anything that
	 * only changes during full modesets.
	 *
	 * FIXME this assumes 1:1 scaling, but the other _worst() stuff
	 * assumes max downscaling, so the final result will be
	 * unrealistically bad. Figure out where the actual maximum value
	 * lies and use that to compute a more realistic worst case
	 * estimate...
	 */
	min_cdclk = _intel_pixel_rate_to_cdclk(crtc_state, clock);

	return _intel_cdclk_prefill_adj(crtc_state, clock, min_cdclk);
}

int intel_cdclk_min_cdclk_for_prefill(const struct intel_crtc_state *crtc_state,
				      unsigned int prefill_lines_unadjusted,
				      unsigned int prefill_lines_available)
{
	struct intel_display *display = to_intel_display(crtc_state);
	const struct drm_display_mode *pipe_mode = &crtc_state->hw.pipe_mode;
	int ppc = intel_cdclk_ppc(display, crtc_state->double_wide);

	return DIV_ROUND_UP_ULL(mul_u32_u32(pipe_mode->crtc_clock, prefill_lines_unadjusted),
				ppc * prefill_lines_available);
}