1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright © 2006-2009 Intel Corporation 4 * 5 * Authors: 6 * Eric Anholt <eric@anholt.net> 7 * Dave Airlie <airlied@linux.ie> 8 * Jesse Barnes <jesse.barnes@intel.com> 9 */ 10 11 #include <linux/i2c.h> 12 #include <drm/drmP.h> 13 #include <asm/intel-mid.h> 14 15 #include "intel_bios.h" 16 #include "psb_drv.h" 17 #include "psb_intel_drv.h" 18 #include "psb_intel_reg.h" 19 #include "power.h" 20 #include <linux/pm_runtime.h> 21 22 /* The max/min PWM frequency in BPCR[31:17] - */ 23 /* The smallest number is 1 (not 0) that can fit in the 24 * 15-bit field of the and then*/ 25 /* shifts to the left by one bit to get the actual 16-bit 26 * value that the 15-bits correspond to.*/ 27 #define MRST_BLC_MAX_PWM_REG_FREQ 0xFFFF 28 #define BRIGHTNESS_MAX_LEVEL 100 29 30 /** 31 * Sets the power state for the panel. 32 */ 33 static void oaktrail_lvds_set_power(struct drm_device *dev, 34 struct gma_encoder *gma_encoder, 35 bool on) 36 { 37 u32 pp_status; 38 struct drm_psb_private *dev_priv = dev->dev_private; 39 40 if (!gma_power_begin(dev, true)) 41 return; 42 43 if (on) { 44 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | 45 POWER_TARGET_ON); 46 do { 47 pp_status = REG_READ(PP_STATUS); 48 } while ((pp_status & (PP_ON | PP_READY)) == PP_READY); 49 dev_priv->is_lvds_on = true; 50 if (dev_priv->ops->lvds_bl_power) 51 dev_priv->ops->lvds_bl_power(dev, true); 52 } else { 53 if (dev_priv->ops->lvds_bl_power) 54 dev_priv->ops->lvds_bl_power(dev, false); 55 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) & 56 ~POWER_TARGET_ON); 57 do { 58 pp_status = REG_READ(PP_STATUS); 59 } while (pp_status & PP_ON); 60 dev_priv->is_lvds_on = false; 61 pm_request_idle(&dev->pdev->dev); 62 } 63 gma_power_end(dev); 64 } 65 66 static void oaktrail_lvds_dpms(struct drm_encoder *encoder, int mode) 67 { 68 struct drm_device *dev = encoder->dev; 69 struct gma_encoder *gma_encoder = to_gma_encoder(encoder); 70 71 if (mode == DRM_MODE_DPMS_ON) 72 oaktrail_lvds_set_power(dev, gma_encoder, true); 73 else 74 oaktrail_lvds_set_power(dev, gma_encoder, false); 75 76 /* XXX: We never power down the LVDS pairs. */ 77 } 78 79 static void oaktrail_lvds_mode_set(struct drm_encoder *encoder, 80 struct drm_display_mode *mode, 81 struct drm_display_mode *adjusted_mode) 82 { 83 struct drm_device *dev = encoder->dev; 84 struct drm_psb_private *dev_priv = dev->dev_private; 85 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 86 struct drm_mode_config *mode_config = &dev->mode_config; 87 struct drm_connector *connector = NULL; 88 struct drm_crtc *crtc = encoder->crtc; 89 u32 lvds_port; 90 uint64_t v = DRM_MODE_SCALE_FULLSCREEN; 91 92 if (!gma_power_begin(dev, true)) 93 return; 94 95 /* 96 * The LVDS pin pair will already have been turned on in the 97 * psb_intel_crtc_mode_set since it has a large impact on the DPLL 98 * settings. 99 */ 100 lvds_port = (REG_READ(LVDS) & 101 (~LVDS_PIPEB_SELECT)) | 102 LVDS_PORT_EN | 103 LVDS_BORDER_EN; 104 105 /* If the firmware says dither on Moorestown, or the BIOS does 106 on Oaktrail then enable dithering */ 107 if (mode_dev->panel_wants_dither || dev_priv->lvds_dither) 108 lvds_port |= MRST_PANEL_8TO6_DITHER_ENABLE; 109 110 REG_WRITE(LVDS, lvds_port); 111 112 /* Find the connector we're trying to set up */ 113 list_for_each_entry(connector, &mode_config->connector_list, head) { 114 if (!connector->encoder || connector->encoder->crtc != crtc) 115 continue; 116 } 117 118 if (!connector) { 119 DRM_ERROR("Couldn't find connector when setting mode"); 120 return; 121 } 122 123 drm_object_property_get_value( 124 &connector->base, 125 dev->mode_config.scaling_mode_property, 126 &v); 127 128 if (v == DRM_MODE_SCALE_NO_SCALE) 129 REG_WRITE(PFIT_CONTROL, 0); 130 else if (v == DRM_MODE_SCALE_ASPECT) { 131 if ((mode->vdisplay != adjusted_mode->crtc_vdisplay) || 132 (mode->hdisplay != adjusted_mode->crtc_hdisplay)) { 133 if ((adjusted_mode->crtc_hdisplay * mode->vdisplay) == 134 (mode->hdisplay * adjusted_mode->crtc_vdisplay)) 135 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE); 136 else if ((adjusted_mode->crtc_hdisplay * 137 mode->vdisplay) > (mode->hdisplay * 138 adjusted_mode->crtc_vdisplay)) 139 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE | 140 PFIT_SCALING_MODE_PILLARBOX); 141 else 142 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE | 143 PFIT_SCALING_MODE_LETTERBOX); 144 } else 145 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE); 146 } else /*(v == DRM_MODE_SCALE_FULLSCREEN)*/ 147 REG_WRITE(PFIT_CONTROL, PFIT_ENABLE); 148 149 gma_power_end(dev); 150 } 151 152 static void oaktrail_lvds_prepare(struct drm_encoder *encoder) 153 { 154 struct drm_device *dev = encoder->dev; 155 struct drm_psb_private *dev_priv = dev->dev_private; 156 struct gma_encoder *gma_encoder = to_gma_encoder(encoder); 157 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 158 159 if (!gma_power_begin(dev, true)) 160 return; 161 162 mode_dev->saveBLC_PWM_CTL = REG_READ(BLC_PWM_CTL); 163 mode_dev->backlight_duty_cycle = (mode_dev->saveBLC_PWM_CTL & 164 BACKLIGHT_DUTY_CYCLE_MASK); 165 oaktrail_lvds_set_power(dev, gma_encoder, false); 166 gma_power_end(dev); 167 } 168 169 static u32 oaktrail_lvds_get_max_backlight(struct drm_device *dev) 170 { 171 struct drm_psb_private *dev_priv = dev->dev_private; 172 u32 ret; 173 174 if (gma_power_begin(dev, false)) { 175 ret = ((REG_READ(BLC_PWM_CTL) & 176 BACKLIGHT_MODULATION_FREQ_MASK) >> 177 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2; 178 179 gma_power_end(dev); 180 } else 181 ret = ((dev_priv->regs.saveBLC_PWM_CTL & 182 BACKLIGHT_MODULATION_FREQ_MASK) >> 183 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2; 184 185 return ret; 186 } 187 188 static void oaktrail_lvds_commit(struct drm_encoder *encoder) 189 { 190 struct drm_device *dev = encoder->dev; 191 struct drm_psb_private *dev_priv = dev->dev_private; 192 struct gma_encoder *gma_encoder = to_gma_encoder(encoder); 193 struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev; 194 195 if (mode_dev->backlight_duty_cycle == 0) 196 mode_dev->backlight_duty_cycle = 197 oaktrail_lvds_get_max_backlight(dev); 198 oaktrail_lvds_set_power(dev, gma_encoder, true); 199 } 200 201 static const struct drm_encoder_helper_funcs oaktrail_lvds_helper_funcs = { 202 .dpms = oaktrail_lvds_dpms, 203 .mode_fixup = psb_intel_lvds_mode_fixup, 204 .prepare = oaktrail_lvds_prepare, 205 .mode_set = oaktrail_lvds_mode_set, 206 .commit = oaktrail_lvds_commit, 207 }; 208 209 /* Returns the panel fixed mode from configuration. */ 210 211 static void oaktrail_lvds_get_configuration_mode(struct drm_device *dev, 212 struct psb_intel_mode_device *mode_dev) 213 { 214 struct drm_display_mode *mode = NULL; 215 struct drm_psb_private *dev_priv = dev->dev_private; 216 struct oaktrail_timing_info *ti = &dev_priv->gct_data.DTD; 217 218 mode_dev->panel_fixed_mode = NULL; 219 220 /* Use the firmware provided data on Moorestown */ 221 if (dev_priv->has_gct) { 222 mode = kzalloc(sizeof(*mode), GFP_KERNEL); 223 if (!mode) 224 return; 225 226 mode->hdisplay = (ti->hactive_hi << 8) | ti->hactive_lo; 227 mode->vdisplay = (ti->vactive_hi << 8) | ti->vactive_lo; 228 mode->hsync_start = mode->hdisplay + \ 229 ((ti->hsync_offset_hi << 8) | \ 230 ti->hsync_offset_lo); 231 mode->hsync_end = mode->hsync_start + \ 232 ((ti->hsync_pulse_width_hi << 8) | \ 233 ti->hsync_pulse_width_lo); 234 mode->htotal = mode->hdisplay + ((ti->hblank_hi << 8) | \ 235 ti->hblank_lo); 236 mode->vsync_start = \ 237 mode->vdisplay + ((ti->vsync_offset_hi << 4) | \ 238 ti->vsync_offset_lo); 239 mode->vsync_end = \ 240 mode->vsync_start + ((ti->vsync_pulse_width_hi << 4) | \ 241 ti->vsync_pulse_width_lo); 242 mode->vtotal = mode->vdisplay + \ 243 ((ti->vblank_hi << 8) | ti->vblank_lo); 244 mode->clock = ti->pixel_clock * 10; 245 #if 0 246 pr_info("hdisplay is %d\n", mode->hdisplay); 247 pr_info("vdisplay is %d\n", mode->vdisplay); 248 pr_info("HSS is %d\n", mode->hsync_start); 249 pr_info("HSE is %d\n", mode->hsync_end); 250 pr_info("htotal is %d\n", mode->htotal); 251 pr_info("VSS is %d\n", mode->vsync_start); 252 pr_info("VSE is %d\n", mode->vsync_end); 253 pr_info("vtotal is %d\n", mode->vtotal); 254 pr_info("clock is %d\n", mode->clock); 255 #endif 256 mode_dev->panel_fixed_mode = mode; 257 } 258 259 /* Use the BIOS VBT mode if available */ 260 if (mode_dev->panel_fixed_mode == NULL && mode_dev->vbt_mode) 261 mode_dev->panel_fixed_mode = drm_mode_duplicate(dev, 262 mode_dev->vbt_mode); 263 264 /* Then try the LVDS VBT mode */ 265 if (mode_dev->panel_fixed_mode == NULL) 266 if (dev_priv->lfp_lvds_vbt_mode) 267 mode_dev->panel_fixed_mode = 268 drm_mode_duplicate(dev, 269 dev_priv->lfp_lvds_vbt_mode); 270 271 /* If we still got no mode then bail */ 272 if (mode_dev->panel_fixed_mode == NULL) 273 return; 274 275 drm_mode_set_name(mode_dev->panel_fixed_mode); 276 drm_mode_set_crtcinfo(mode_dev->panel_fixed_mode, 0); 277 } 278 279 /** 280 * oaktrail_lvds_init - setup LVDS connectors on this device 281 * @dev: drm device 282 * 283 * Create the connector, register the LVDS DDC bus, and try to figure out what 284 * modes we can display on the LVDS panel (if present). 285 */ 286 void oaktrail_lvds_init(struct drm_device *dev, 287 struct psb_intel_mode_device *mode_dev) 288 { 289 struct gma_encoder *gma_encoder; 290 struct gma_connector *gma_connector; 291 struct drm_connector *connector; 292 struct drm_encoder *encoder; 293 struct drm_psb_private *dev_priv = dev->dev_private; 294 struct edid *edid; 295 struct i2c_adapter *i2c_adap; 296 struct drm_display_mode *scan; /* *modes, *bios_mode; */ 297 298 gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL); 299 if (!gma_encoder) 300 return; 301 302 gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL); 303 if (!gma_connector) 304 goto failed_connector; 305 306 connector = &gma_connector->base; 307 encoder = &gma_encoder->base; 308 dev_priv->is_lvds_on = true; 309 drm_connector_init(dev, connector, 310 &psb_intel_lvds_connector_funcs, 311 DRM_MODE_CONNECTOR_LVDS); 312 313 drm_encoder_init(dev, encoder, &psb_intel_lvds_enc_funcs, 314 DRM_MODE_ENCODER_LVDS, NULL); 315 316 gma_connector_attach_encoder(gma_connector, gma_encoder); 317 gma_encoder->type = INTEL_OUTPUT_LVDS; 318 319 drm_encoder_helper_add(encoder, &oaktrail_lvds_helper_funcs); 320 drm_connector_helper_add(connector, 321 &psb_intel_lvds_connector_helper_funcs); 322 connector->display_info.subpixel_order = SubPixelHorizontalRGB; 323 connector->interlace_allowed = false; 324 connector->doublescan_allowed = false; 325 326 drm_object_attach_property(&connector->base, 327 dev->mode_config.scaling_mode_property, 328 DRM_MODE_SCALE_FULLSCREEN); 329 drm_object_attach_property(&connector->base, 330 dev_priv->backlight_property, 331 BRIGHTNESS_MAX_LEVEL); 332 333 mode_dev->panel_wants_dither = false; 334 if (dev_priv->has_gct) 335 mode_dev->panel_wants_dither = (dev_priv->gct_data. 336 Panel_Port_Control & MRST_PANEL_8TO6_DITHER_ENABLE); 337 if (dev_priv->lvds_dither) 338 mode_dev->panel_wants_dither = 1; 339 340 /* 341 * LVDS discovery: 342 * 1) check for EDID on DDC 343 * 2) check for VBT data 344 * 3) check to see if LVDS is already on 345 * if none of the above, no panel 346 * 4) make sure lid is open 347 * if closed, act like it's not there for now 348 */ 349 350 edid = NULL; 351 mutex_lock(&dev->mode_config.mutex); 352 i2c_adap = i2c_get_adapter(dev_priv->ops->i2c_bus); 353 if (i2c_adap) 354 edid = drm_get_edid(connector, i2c_adap); 355 if (edid == NULL && dev_priv->lpc_gpio_base) { 356 oaktrail_lvds_i2c_init(encoder); 357 if (gma_encoder->ddc_bus != NULL) { 358 i2c_adap = &gma_encoder->ddc_bus->adapter; 359 edid = drm_get_edid(connector, i2c_adap); 360 } 361 } 362 /* 363 * Attempt to get the fixed panel mode from DDC. Assume that the 364 * preferred mode is the right one. 365 */ 366 if (edid) { 367 drm_connector_update_edid_property(connector, edid); 368 drm_add_edid_modes(connector, edid); 369 kfree(edid); 370 371 list_for_each_entry(scan, &connector->probed_modes, head) { 372 if (scan->type & DRM_MODE_TYPE_PREFERRED) { 373 mode_dev->panel_fixed_mode = 374 drm_mode_duplicate(dev, scan); 375 goto out; /* FIXME: check for quirks */ 376 } 377 } 378 } else 379 dev_err(dev->dev, "No ddc adapter available!\n"); 380 /* 381 * If we didn't get EDID, try geting panel timing 382 * from configuration data 383 */ 384 oaktrail_lvds_get_configuration_mode(dev, mode_dev); 385 386 if (mode_dev->panel_fixed_mode) { 387 mode_dev->panel_fixed_mode->type |= DRM_MODE_TYPE_PREFERRED; 388 goto out; /* FIXME: check for quirks */ 389 } 390 391 /* If we still don't have a mode after all that, give up. */ 392 if (!mode_dev->panel_fixed_mode) { 393 dev_err(dev->dev, "Found no modes on the lvds, ignoring the LVDS\n"); 394 goto failed_find; 395 } 396 397 out: 398 mutex_unlock(&dev->mode_config.mutex); 399 400 drm_connector_register(connector); 401 return; 402 403 failed_find: 404 mutex_unlock(&dev->mode_config.mutex); 405 406 dev_dbg(dev->dev, "No LVDS modes found, disabling.\n"); 407 if (gma_encoder->ddc_bus) { 408 psb_intel_i2c_destroy(gma_encoder->ddc_bus); 409 gma_encoder->ddc_bus = NULL; 410 } 411 412 /* failed_ddc: */ 413 414 drm_encoder_cleanup(encoder); 415 drm_connector_cleanup(connector); 416 kfree(gma_connector); 417 failed_connector: 418 kfree(gma_encoder); 419 } 420 421