1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2015 Free Electrons 4 * Copyright (C) 2015 NextThing Co 5 * 6 * Maxime Ripard <maxime.ripard@free-electrons.com> 7 */ 8 9 #include <linux/component.h> 10 #include <linux/ioport.h> 11 #include <linux/media-bus-format.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/of_platform.h> 15 #include <linux/platform_device.h> 16 #include <linux/regmap.h> 17 #include <linux/reset.h> 18 19 #include <drm/drm_atomic_helper.h> 20 #include <drm/drm_bridge.h> 21 #include <drm/drm_connector.h> 22 #include <drm/drm_crtc.h> 23 #include <drm/drm_encoder.h> 24 #include <drm/drm_modes.h> 25 #include <drm/drm_of.h> 26 #include <drm/drm_panel.h> 27 #include <drm/drm_print.h> 28 #include <drm/drm_probe_helper.h> 29 #include <drm/drm_vblank.h> 30 31 #include <uapi/drm/drm_mode.h> 32 33 #include "sun4i_crtc.h" 34 #include "sun4i_drv.h" 35 #include "sun4i_lvds.h" 36 #include "sun4i_rgb.h" 37 #include "sun4i_tcon.h" 38 #include "sun6i_mipi_dsi.h" 39 #include "sun4i_tcon_dclk.h" 40 #include "sun8i_tcon_top.h" 41 #include "sunxi_engine.h" 42 43 static struct drm_connector *sun4i_tcon_get_connector(const struct drm_encoder *encoder) 44 { 45 struct drm_connector *connector; 46 struct drm_connector_list_iter iter; 47 48 drm_connector_list_iter_begin(encoder->dev, &iter); 49 drm_for_each_connector_iter(connector, &iter) 50 if (connector->encoder == encoder) { 51 drm_connector_list_iter_end(&iter); 52 return connector; 53 } 54 drm_connector_list_iter_end(&iter); 55 56 return NULL; 57 } 58 59 static int sun4i_tcon_get_pixel_depth(const struct drm_encoder *encoder) 60 { 61 struct drm_connector *connector; 62 struct drm_display_info *info; 63 64 connector = sun4i_tcon_get_connector(encoder); 65 if (!connector) 66 return -EINVAL; 67 68 info = &connector->display_info; 69 if (info->num_bus_formats != 1) 70 return -EINVAL; 71 72 switch (info->bus_formats[0]) { 73 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: 74 return 18; 75 76 case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: 77 case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: 78 return 24; 79 } 80 81 return -EINVAL; 82 } 83 84 static void sun4i_tcon_channel_set_status(struct sun4i_tcon *tcon, int channel, 85 bool enabled) 86 { 87 struct clk *clk; 88 89 switch (channel) { 90 case 0: 91 WARN_ON(!tcon->quirks->has_channel_0); 92 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG, 93 SUN4I_TCON0_CTL_TCON_ENABLE, 94 enabled ? SUN4I_TCON0_CTL_TCON_ENABLE : 0); 95 clk = tcon->dclk; 96 break; 97 case 1: 98 WARN_ON(!tcon->quirks->has_channel_1); 99 regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, 100 SUN4I_TCON1_CTL_TCON_ENABLE, 101 enabled ? SUN4I_TCON1_CTL_TCON_ENABLE : 0); 102 clk = tcon->sclk1; 103 break; 104 default: 105 DRM_WARN("Unknown channel... doing nothing\n"); 106 return; 107 } 108 109 if (enabled) { 110 clk_prepare_enable(clk); 111 clk_rate_exclusive_get(clk); 112 } else { 113 clk_rate_exclusive_put(clk); 114 clk_disable_unprepare(clk); 115 } 116 } 117 118 static void sun4i_tcon_setup_lvds_phy(struct sun4i_tcon *tcon, 119 const struct drm_encoder *encoder) 120 { 121 regmap_write(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG, 122 SUN4I_TCON0_LVDS_ANA0_CK_EN | 123 SUN4I_TCON0_LVDS_ANA0_REG_V | 124 SUN4I_TCON0_LVDS_ANA0_REG_C | 125 SUN4I_TCON0_LVDS_ANA0_EN_MB | 126 SUN4I_TCON0_LVDS_ANA0_PD | 127 SUN4I_TCON0_LVDS_ANA0_DCHS); 128 129 udelay(2); /* delay at least 1200 ns */ 130 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA1_REG, 131 SUN4I_TCON0_LVDS_ANA1_INIT, 132 SUN4I_TCON0_LVDS_ANA1_INIT); 133 udelay(1); /* delay at least 120 ns */ 134 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA1_REG, 135 SUN4I_TCON0_LVDS_ANA1_UPDATE, 136 SUN4I_TCON0_LVDS_ANA1_UPDATE); 137 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG, 138 SUN4I_TCON0_LVDS_ANA0_EN_MB, 139 SUN4I_TCON0_LVDS_ANA0_EN_MB); 140 } 141 142 static void sun6i_tcon_setup_lvds_phy(struct sun4i_tcon *tcon, 143 const struct drm_encoder *encoder) 144 { 145 u8 val; 146 147 regmap_write(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG, 148 SUN6I_TCON0_LVDS_ANA0_C(2) | 149 SUN6I_TCON0_LVDS_ANA0_V(3) | 150 SUN6I_TCON0_LVDS_ANA0_PD(2) | 151 SUN6I_TCON0_LVDS_ANA0_EN_LDO); 152 udelay(2); 153 154 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG, 155 SUN6I_TCON0_LVDS_ANA0_EN_MB, 156 SUN6I_TCON0_LVDS_ANA0_EN_MB); 157 udelay(2); 158 159 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG, 160 SUN6I_TCON0_LVDS_ANA0_EN_DRVC, 161 SUN6I_TCON0_LVDS_ANA0_EN_DRVC); 162 163 if (sun4i_tcon_get_pixel_depth(encoder) == 18) 164 val = 7; 165 else 166 val = 0xf; 167 168 regmap_write_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG, 169 SUN6I_TCON0_LVDS_ANA0_EN_DRVD(0xf), 170 SUN6I_TCON0_LVDS_ANA0_EN_DRVD(val)); 171 } 172 173 static void sun4i_tcon_lvds_set_status(struct sun4i_tcon *tcon, 174 const struct drm_encoder *encoder, 175 bool enabled) 176 { 177 if (enabled) { 178 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_IF_REG, 179 SUN4I_TCON0_LVDS_IF_EN, 180 SUN4I_TCON0_LVDS_IF_EN); 181 if (tcon->quirks->setup_lvds_phy) 182 tcon->quirks->setup_lvds_phy(tcon, encoder); 183 } else { 184 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_IF_REG, 185 SUN4I_TCON0_LVDS_IF_EN, 0); 186 } 187 } 188 189 void sun4i_tcon_set_status(struct sun4i_tcon *tcon, 190 const struct drm_encoder *encoder, 191 bool enabled) 192 { 193 bool is_lvds = false; 194 int channel; 195 196 switch (encoder->encoder_type) { 197 case DRM_MODE_ENCODER_LVDS: 198 is_lvds = true; 199 fallthrough; 200 case DRM_MODE_ENCODER_DSI: 201 case DRM_MODE_ENCODER_NONE: 202 channel = 0; 203 break; 204 case DRM_MODE_ENCODER_TMDS: 205 case DRM_MODE_ENCODER_TVDAC: 206 channel = 1; 207 break; 208 default: 209 DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n"); 210 return; 211 } 212 213 if (is_lvds && !enabled) 214 sun4i_tcon_lvds_set_status(tcon, encoder, false); 215 216 regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG, 217 SUN4I_TCON_GCTL_TCON_ENABLE, 218 enabled ? SUN4I_TCON_GCTL_TCON_ENABLE : 0); 219 220 if (is_lvds && enabled) 221 sun4i_tcon_lvds_set_status(tcon, encoder, true); 222 223 sun4i_tcon_channel_set_status(tcon, channel, enabled); 224 } 225 226 void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable) 227 { 228 u32 mask, val = 0; 229 230 DRM_DEBUG_DRIVER("%sabling VBLANK interrupt\n", enable ? "En" : "Dis"); 231 232 mask = SUN4I_TCON_GINT0_VBLANK_ENABLE(0) | 233 SUN4I_TCON_GINT0_VBLANK_ENABLE(1) | 234 SUN4I_TCON_GINT0_TCON0_TRI_FINISH_ENABLE; 235 236 if (enable) 237 val = mask; 238 239 regmap_update_bits(tcon->regs, SUN4I_TCON_GINT0_REG, mask, val); 240 } 241 EXPORT_SYMBOL(sun4i_tcon_enable_vblank); 242 243 /* 244 * This function is a helper for TCON output muxing. The TCON output 245 * muxing control register in earlier SoCs (without the TCON TOP block) 246 * are located in TCON0. This helper returns a pointer to TCON0's 247 * sun4i_tcon structure, or NULL if not found. 248 */ 249 static struct sun4i_tcon *sun4i_get_tcon0(struct drm_device *drm) 250 { 251 struct sun4i_drv *drv = drm->dev_private; 252 struct sun4i_tcon *tcon; 253 254 list_for_each_entry(tcon, &drv->tcon_list, list) 255 if (tcon->id == 0) 256 return tcon; 257 258 dev_warn(drm->dev, 259 "TCON0 not found, display output muxing may not work\n"); 260 261 return NULL; 262 } 263 264 static void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel, 265 const struct drm_encoder *encoder) 266 { 267 int ret = -ENOTSUPP; 268 269 if (tcon->quirks->set_mux) 270 ret = tcon->quirks->set_mux(tcon, encoder); 271 272 DRM_DEBUG_DRIVER("Muxing encoder %s to CRTC %s: %d\n", 273 encoder->name, encoder->crtc->name, ret); 274 } 275 276 static int sun4i_tcon_get_clk_delay(const struct drm_display_mode *mode, 277 int channel) 278 { 279 int delay = mode->vtotal - mode->vdisplay; 280 281 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 282 delay /= 2; 283 284 if (channel == 1) 285 delay -= 2; 286 287 delay = min(delay, 30); 288 289 DRM_DEBUG_DRIVER("TCON %d clock delay %u\n", channel, delay); 290 291 return delay; 292 } 293 294 static void sun4i_tcon0_mode_set_dithering(struct sun4i_tcon *tcon, 295 const struct drm_connector *connector) 296 { 297 u32 bus_format = 0; 298 u32 val = 0; 299 300 /* XXX Would this ever happen? */ 301 if (!connector) 302 return; 303 304 /* 305 * FIXME: Undocumented bits 306 * 307 * The whole dithering process and these parameters are not 308 * explained in the vendor documents or BSP kernel code. 309 */ 310 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_PR_REG, 0x11111111); 311 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_PG_REG, 0x11111111); 312 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_PB_REG, 0x11111111); 313 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_LR_REG, 0x11111111); 314 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_LG_REG, 0x11111111); 315 regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_LB_REG, 0x11111111); 316 regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL0_REG, 0x01010000); 317 regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL1_REG, 0x15151111); 318 regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL2_REG, 0x57575555); 319 regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL3_REG, 0x7f7f7777); 320 321 /* Do dithering if panel only supports 6 bits per color */ 322 if (connector->display_info.bpc == 6) 323 val |= SUN4I_TCON0_FRM_CTL_EN; 324 325 if (connector->display_info.num_bus_formats == 1) 326 bus_format = connector->display_info.bus_formats[0]; 327 328 /* Check the connection format */ 329 switch (bus_format) { 330 case MEDIA_BUS_FMT_RGB565_1X16: 331 /* R and B components are only 5 bits deep */ 332 val |= SUN4I_TCON0_FRM_CTL_MODE_R; 333 val |= SUN4I_TCON0_FRM_CTL_MODE_B; 334 fallthrough; 335 case MEDIA_BUS_FMT_RGB666_1X18: 336 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: 337 /* Fall through: enable dithering */ 338 val |= SUN4I_TCON0_FRM_CTL_EN; 339 break; 340 } 341 342 /* Write dithering settings */ 343 regmap_write(tcon->regs, SUN4I_TCON_FRM_CTL_REG, val); 344 } 345 346 static void sun4i_tcon0_mode_set_cpu(struct sun4i_tcon *tcon, 347 const struct drm_encoder *encoder, 348 const struct drm_display_mode *mode) 349 { 350 /* TODO support normal CPU interface modes */ 351 struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder); 352 struct mipi_dsi_device *device = dsi->device; 353 u8 bpp = mipi_dsi_pixel_format_to_bpp(device->format); 354 u8 lanes = device->lanes; 355 u32 block_space, start_delay; 356 u32 tcon_div; 357 358 /* 359 * dclk is required to run at 1/4 the DSI per-lane bit rate. 360 */ 361 tcon->dclk_min_div = SUN6I_DSI_TCON_DIV; 362 tcon->dclk_max_div = SUN6I_DSI_TCON_DIV; 363 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000 * (bpp / lanes) 364 / SUN6I_DSI_TCON_DIV); 365 366 /* Set the resolution */ 367 regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG, 368 SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) | 369 SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay)); 370 371 /* Set dithering if needed */ 372 sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder)); 373 374 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG, 375 SUN4I_TCON0_CTL_IF_MASK, 376 SUN4I_TCON0_CTL_IF_8080); 377 378 regmap_write(tcon->regs, SUN4I_TCON_ECC_FIFO_REG, 379 SUN4I_TCON_ECC_FIFO_EN); 380 381 regmap_write(tcon->regs, SUN4I_TCON0_CPU_IF_REG, 382 SUN4I_TCON0_CPU_IF_MODE_DSI | 383 SUN4I_TCON0_CPU_IF_TRI_FIFO_FLUSH | 384 SUN4I_TCON0_CPU_IF_TRI_FIFO_EN | 385 SUN4I_TCON0_CPU_IF_TRI_EN); 386 387 /* 388 * This looks suspicious, but it works... 389 * 390 * The datasheet says that this should be set higher than 20 * 391 * pixel cycle, but it's not clear what a pixel cycle is. 392 */ 393 regmap_read(tcon->regs, SUN4I_TCON0_DCLK_REG, &tcon_div); 394 tcon_div &= GENMASK(6, 0); 395 block_space = mode->htotal * bpp / (tcon_div * lanes); 396 block_space -= mode->hdisplay + 40; 397 398 regmap_write(tcon->regs, SUN4I_TCON0_CPU_TRI0_REG, 399 SUN4I_TCON0_CPU_TRI0_BLOCK_SPACE(block_space) | 400 SUN4I_TCON0_CPU_TRI0_BLOCK_SIZE(mode->hdisplay)); 401 402 regmap_write(tcon->regs, SUN4I_TCON0_CPU_TRI1_REG, 403 SUN4I_TCON0_CPU_TRI1_BLOCK_NUM(mode->vdisplay)); 404 405 start_delay = (mode->crtc_vtotal - mode->crtc_vdisplay - 10 - 1); 406 start_delay = start_delay * mode->crtc_htotal * 149; 407 start_delay = start_delay / (mode->crtc_clock / 1000) / 8; 408 regmap_write(tcon->regs, SUN4I_TCON0_CPU_TRI2_REG, 409 SUN4I_TCON0_CPU_TRI2_TRANS_START_SET(10) | 410 SUN4I_TCON0_CPU_TRI2_START_DELAY(start_delay)); 411 412 /* 413 * The Allwinner BSP has a comment that the period should be 414 * the display clock * 15, but uses an hardcoded 3000... 415 */ 416 regmap_write(tcon->regs, SUN4I_TCON_SAFE_PERIOD_REG, 417 SUN4I_TCON_SAFE_PERIOD_NUM(3000) | 418 SUN4I_TCON_SAFE_PERIOD_MODE(3)); 419 420 /* Enable the output on the pins */ 421 regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, 422 0xe0000000); 423 } 424 425 static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon, 426 const struct drm_encoder *encoder, 427 const struct drm_display_mode *mode) 428 { 429 unsigned int bp; 430 u8 clk_delay; 431 u32 reg, val = 0; 432 433 WARN_ON(!tcon->quirks->has_channel_0); 434 435 tcon->dclk_min_div = 7; 436 tcon->dclk_max_div = 7; 437 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); 438 439 /* Set the resolution */ 440 regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG, 441 SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) | 442 SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay)); 443 444 /* Set dithering if needed */ 445 sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder)); 446 447 /* Adjust clock delay */ 448 clk_delay = sun4i_tcon_get_clk_delay(mode, 0); 449 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG, 450 SUN4I_TCON0_CTL_CLK_DELAY_MASK, 451 SUN4I_TCON0_CTL_CLK_DELAY(clk_delay)); 452 453 /* 454 * This is called a backporch in the register documentation, 455 * but it really is the back porch + hsync 456 */ 457 bp = mode->crtc_htotal - mode->crtc_hsync_start; 458 DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n", 459 mode->crtc_htotal, bp); 460 461 /* Set horizontal display timings */ 462 regmap_write(tcon->regs, SUN4I_TCON0_BASIC1_REG, 463 SUN4I_TCON0_BASIC1_H_TOTAL(mode->htotal) | 464 SUN4I_TCON0_BASIC1_H_BACKPORCH(bp)); 465 466 /* 467 * This is called a backporch in the register documentation, 468 * but it really is the back porch + hsync 469 */ 470 bp = mode->crtc_vtotal - mode->crtc_vsync_start; 471 DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n", 472 mode->crtc_vtotal, bp); 473 474 /* Set vertical display timings */ 475 regmap_write(tcon->regs, SUN4I_TCON0_BASIC2_REG, 476 SUN4I_TCON0_BASIC2_V_TOTAL(mode->crtc_vtotal * 2) | 477 SUN4I_TCON0_BASIC2_V_BACKPORCH(bp)); 478 479 reg = SUN4I_TCON0_LVDS_IF_CLK_SEL_TCON0; 480 if (sun4i_tcon_get_pixel_depth(encoder) == 24) 481 reg |= SUN4I_TCON0_LVDS_IF_BITWIDTH_24BITS; 482 else 483 reg |= SUN4I_TCON0_LVDS_IF_BITWIDTH_18BITS; 484 485 regmap_write(tcon->regs, SUN4I_TCON0_LVDS_IF_REG, reg); 486 487 /* Setup the polarity of the various signals */ 488 if (!(mode->flags & DRM_MODE_FLAG_PHSYNC)) 489 val |= SUN4I_TCON0_IO_POL_HSYNC_POSITIVE; 490 491 if (!(mode->flags & DRM_MODE_FLAG_PVSYNC)) 492 val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE; 493 494 regmap_write(tcon->regs, SUN4I_TCON0_IO_POL_REG, val); 495 496 /* Map output pins to channel 0 */ 497 regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG, 498 SUN4I_TCON_GCTL_IOMAP_MASK, 499 SUN4I_TCON_GCTL_IOMAP_TCON0); 500 501 /* Enable the output on the pins */ 502 regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, 0xe0000000); 503 } 504 505 static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon, 506 const struct drm_encoder *encoder, 507 const struct drm_display_mode *mode) 508 { 509 struct drm_connector *connector = sun4i_tcon_get_connector(encoder); 510 const struct drm_display_info *info = &connector->display_info; 511 unsigned int bp, hsync, vsync; 512 u8 clk_delay; 513 u32 val = 0; 514 515 WARN_ON(!tcon->quirks->has_channel_0); 516 517 tcon->dclk_min_div = tcon->quirks->dclk_min_div; 518 tcon->dclk_max_div = 127; 519 clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); 520 521 /* Set the resolution */ 522 regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG, 523 SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) | 524 SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay)); 525 526 /* Set dithering if needed */ 527 sun4i_tcon0_mode_set_dithering(tcon, connector); 528 529 /* Adjust clock delay */ 530 clk_delay = sun4i_tcon_get_clk_delay(mode, 0); 531 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG, 532 SUN4I_TCON0_CTL_CLK_DELAY_MASK, 533 SUN4I_TCON0_CTL_CLK_DELAY(clk_delay)); 534 535 /* 536 * This is called a backporch in the register documentation, 537 * but it really is the back porch + hsync 538 */ 539 bp = mode->crtc_htotal - mode->crtc_hsync_start; 540 DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n", 541 mode->crtc_htotal, bp); 542 543 /* Set horizontal display timings */ 544 regmap_write(tcon->regs, SUN4I_TCON0_BASIC1_REG, 545 SUN4I_TCON0_BASIC1_H_TOTAL(mode->crtc_htotal) | 546 SUN4I_TCON0_BASIC1_H_BACKPORCH(bp)); 547 548 /* 549 * This is called a backporch in the register documentation, 550 * but it really is the back porch + hsync 551 */ 552 bp = mode->crtc_vtotal - mode->crtc_vsync_start; 553 DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n", 554 mode->crtc_vtotal, bp); 555 556 /* Set vertical display timings */ 557 regmap_write(tcon->regs, SUN4I_TCON0_BASIC2_REG, 558 SUN4I_TCON0_BASIC2_V_TOTAL(mode->crtc_vtotal * 2) | 559 SUN4I_TCON0_BASIC2_V_BACKPORCH(bp)); 560 561 /* Set Hsync and Vsync length */ 562 hsync = mode->crtc_hsync_end - mode->crtc_hsync_start; 563 vsync = mode->crtc_vsync_end - mode->crtc_vsync_start; 564 DRM_DEBUG_DRIVER("Setting HSYNC %d, VSYNC %d\n", hsync, vsync); 565 regmap_write(tcon->regs, SUN4I_TCON0_BASIC3_REG, 566 SUN4I_TCON0_BASIC3_V_SYNC(vsync) | 567 SUN4I_TCON0_BASIC3_H_SYNC(hsync)); 568 569 /* Setup the polarity of the various signals */ 570 if (mode->flags & DRM_MODE_FLAG_PHSYNC) 571 val |= SUN4I_TCON0_IO_POL_HSYNC_POSITIVE; 572 573 if (mode->flags & DRM_MODE_FLAG_PVSYNC) 574 val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE; 575 576 if (info->bus_flags & DRM_BUS_FLAG_DE_LOW) 577 val |= SUN4I_TCON0_IO_POL_DE_NEGATIVE; 578 579 if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE) 580 val |= SUN4I_TCON0_IO_POL_DCLK_DRIVE_NEGEDGE; 581 582 regmap_update_bits(tcon->regs, SUN4I_TCON0_IO_POL_REG, 583 SUN4I_TCON0_IO_POL_HSYNC_POSITIVE | 584 SUN4I_TCON0_IO_POL_VSYNC_POSITIVE | 585 SUN4I_TCON0_IO_POL_DCLK_DRIVE_NEGEDGE | 586 SUN4I_TCON0_IO_POL_DE_NEGATIVE, 587 val); 588 589 /* Map output pins to channel 0 */ 590 regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG, 591 SUN4I_TCON_GCTL_IOMAP_MASK, 592 SUN4I_TCON_GCTL_IOMAP_TCON0); 593 594 /* Enable the output on the pins */ 595 regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, 0); 596 } 597 598 static void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon, 599 const struct drm_display_mode *mode) 600 { 601 unsigned int bp, hsync, vsync, vtotal; 602 u8 clk_delay; 603 u32 val; 604 605 WARN_ON(!tcon->quirks->has_channel_1); 606 607 /* Configure the dot clock */ 608 clk_set_rate(tcon->sclk1, mode->crtc_clock * 1000); 609 610 /* Adjust clock delay */ 611 clk_delay = sun4i_tcon_get_clk_delay(mode, 1); 612 regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, 613 SUN4I_TCON1_CTL_CLK_DELAY_MASK, 614 SUN4I_TCON1_CTL_CLK_DELAY(clk_delay)); 615 616 /* Set interlaced mode */ 617 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 618 val = SUN4I_TCON1_CTL_INTERLACE_ENABLE; 619 else 620 val = 0; 621 regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, 622 SUN4I_TCON1_CTL_INTERLACE_ENABLE, 623 val); 624 625 /* Set the input resolution */ 626 regmap_write(tcon->regs, SUN4I_TCON1_BASIC0_REG, 627 SUN4I_TCON1_BASIC0_X(mode->crtc_hdisplay) | 628 SUN4I_TCON1_BASIC0_Y(mode->crtc_vdisplay)); 629 630 /* Set the upscaling resolution */ 631 regmap_write(tcon->regs, SUN4I_TCON1_BASIC1_REG, 632 SUN4I_TCON1_BASIC1_X(mode->crtc_hdisplay) | 633 SUN4I_TCON1_BASIC1_Y(mode->crtc_vdisplay)); 634 635 /* Set the output resolution */ 636 regmap_write(tcon->regs, SUN4I_TCON1_BASIC2_REG, 637 SUN4I_TCON1_BASIC2_X(mode->crtc_hdisplay) | 638 SUN4I_TCON1_BASIC2_Y(mode->crtc_vdisplay)); 639 640 /* Set horizontal display timings */ 641 bp = mode->crtc_htotal - mode->crtc_hsync_start; 642 DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n", 643 mode->htotal, bp); 644 regmap_write(tcon->regs, SUN4I_TCON1_BASIC3_REG, 645 SUN4I_TCON1_BASIC3_H_TOTAL(mode->crtc_htotal) | 646 SUN4I_TCON1_BASIC3_H_BACKPORCH(bp)); 647 648 bp = mode->crtc_vtotal - mode->crtc_vsync_start; 649 DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n", 650 mode->crtc_vtotal, bp); 651 652 /* 653 * The vertical resolution needs to be doubled in all 654 * cases. We could use crtc_vtotal and always multiply by two, 655 * but that leads to a rounding error in interlace when vtotal 656 * is odd. 657 * 658 * This happens with TV's PAL for example, where vtotal will 659 * be 625, crtc_vtotal 312, and thus crtc_vtotal * 2 will be 660 * 624, which apparently confuses the hardware. 661 * 662 * To work around this, we will always use vtotal, and 663 * multiply by two only if we're not in interlace. 664 */ 665 vtotal = mode->vtotal; 666 if (!(mode->flags & DRM_MODE_FLAG_INTERLACE)) 667 vtotal = vtotal * 2; 668 669 /* Set vertical display timings */ 670 regmap_write(tcon->regs, SUN4I_TCON1_BASIC4_REG, 671 SUN4I_TCON1_BASIC4_V_TOTAL(vtotal) | 672 SUN4I_TCON1_BASIC4_V_BACKPORCH(bp)); 673 674 /* Set Hsync and Vsync length */ 675 hsync = mode->crtc_hsync_end - mode->crtc_hsync_start; 676 vsync = mode->crtc_vsync_end - mode->crtc_vsync_start; 677 DRM_DEBUG_DRIVER("Setting HSYNC %d, VSYNC %d\n", hsync, vsync); 678 regmap_write(tcon->regs, SUN4I_TCON1_BASIC5_REG, 679 SUN4I_TCON1_BASIC5_V_SYNC(vsync) | 680 SUN4I_TCON1_BASIC5_H_SYNC(hsync)); 681 682 /* Setup the polarity of multiple signals */ 683 if (tcon->quirks->polarity_in_ch0) { 684 val = 0; 685 686 if (mode->flags & DRM_MODE_FLAG_PHSYNC) 687 val |= SUN4I_TCON0_IO_POL_HSYNC_POSITIVE; 688 689 if (mode->flags & DRM_MODE_FLAG_PVSYNC) 690 val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE; 691 692 regmap_write(tcon->regs, SUN4I_TCON0_IO_POL_REG, val); 693 } else { 694 /* according to vendor driver, this bit must be always set */ 695 val = SUN4I_TCON1_IO_POL_UNKNOWN; 696 697 if (mode->flags & DRM_MODE_FLAG_PHSYNC) 698 val |= SUN4I_TCON1_IO_POL_HSYNC_POSITIVE; 699 700 if (mode->flags & DRM_MODE_FLAG_PVSYNC) 701 val |= SUN4I_TCON1_IO_POL_VSYNC_POSITIVE; 702 703 regmap_write(tcon->regs, SUN4I_TCON1_IO_POL_REG, val); 704 } 705 706 /* Map output pins to channel 1 */ 707 regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG, 708 SUN4I_TCON_GCTL_IOMAP_MASK, 709 SUN4I_TCON_GCTL_IOMAP_TCON1); 710 } 711 712 void sun4i_tcon_mode_set(struct sun4i_tcon *tcon, 713 const struct drm_encoder *encoder, 714 const struct drm_display_mode *mode) 715 { 716 switch (encoder->encoder_type) { 717 case DRM_MODE_ENCODER_DSI: 718 /* DSI is tied to special case of CPU interface */ 719 sun4i_tcon0_mode_set_cpu(tcon, encoder, mode); 720 break; 721 case DRM_MODE_ENCODER_LVDS: 722 sun4i_tcon0_mode_set_lvds(tcon, encoder, mode); 723 break; 724 case DRM_MODE_ENCODER_NONE: 725 sun4i_tcon0_mode_set_rgb(tcon, encoder, mode); 726 sun4i_tcon_set_mux(tcon, 0, encoder); 727 break; 728 case DRM_MODE_ENCODER_TVDAC: 729 case DRM_MODE_ENCODER_TMDS: 730 sun4i_tcon1_mode_set(tcon, mode); 731 sun4i_tcon_set_mux(tcon, 1, encoder); 732 break; 733 default: 734 DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n"); 735 } 736 } 737 EXPORT_SYMBOL(sun4i_tcon_mode_set); 738 739 static void sun4i_tcon_finish_page_flip(struct drm_device *dev, 740 struct sun4i_crtc *scrtc) 741 { 742 unsigned long flags; 743 744 spin_lock_irqsave(&dev->event_lock, flags); 745 if (scrtc->event) { 746 drm_crtc_send_vblank_event(&scrtc->crtc, scrtc->event); 747 drm_crtc_vblank_put(&scrtc->crtc); 748 scrtc->event = NULL; 749 } 750 spin_unlock_irqrestore(&dev->event_lock, flags); 751 } 752 753 static irqreturn_t sun4i_tcon_handler(int irq, void *private) 754 { 755 struct sun4i_tcon *tcon = private; 756 struct drm_device *drm = tcon->drm; 757 struct sun4i_crtc *scrtc = tcon->crtc; 758 struct sunxi_engine *engine = scrtc->engine; 759 unsigned int status; 760 761 regmap_read(tcon->regs, SUN4I_TCON_GINT0_REG, &status); 762 763 if (!(status & (SUN4I_TCON_GINT0_VBLANK_INT(0) | 764 SUN4I_TCON_GINT0_VBLANK_INT(1) | 765 SUN4I_TCON_GINT0_TCON0_TRI_FINISH_INT))) 766 return IRQ_NONE; 767 768 drm_crtc_handle_vblank(&scrtc->crtc); 769 sun4i_tcon_finish_page_flip(drm, scrtc); 770 771 /* Acknowledge the interrupt */ 772 regmap_update_bits(tcon->regs, SUN4I_TCON_GINT0_REG, 773 SUN4I_TCON_GINT0_VBLANK_INT(0) | 774 SUN4I_TCON_GINT0_VBLANK_INT(1) | 775 SUN4I_TCON_GINT0_TCON0_TRI_FINISH_INT, 776 0); 777 778 if (engine->ops->vblank_quirk) 779 engine->ops->vblank_quirk(engine); 780 781 return IRQ_HANDLED; 782 } 783 784 static int sun4i_tcon_init_clocks(struct device *dev, 785 struct sun4i_tcon *tcon) 786 { 787 tcon->clk = devm_clk_get_enabled(dev, "ahb"); 788 if (IS_ERR(tcon->clk)) { 789 dev_err(dev, "Couldn't get the TCON bus clock\n"); 790 return PTR_ERR(tcon->clk); 791 } 792 793 if (tcon->quirks->has_channel_0) { 794 tcon->sclk0 = devm_clk_get_enabled(dev, "tcon-ch0"); 795 if (IS_ERR(tcon->sclk0)) { 796 dev_err(dev, "Couldn't get the TCON channel 0 clock\n"); 797 return PTR_ERR(tcon->sclk0); 798 } 799 } 800 801 if (tcon->quirks->has_channel_1) { 802 tcon->sclk1 = devm_clk_get(dev, "tcon-ch1"); 803 if (IS_ERR(tcon->sclk1)) { 804 dev_err(dev, "Couldn't get the TCON channel 1 clock\n"); 805 return PTR_ERR(tcon->sclk1); 806 } 807 } 808 809 return 0; 810 } 811 812 static int sun4i_tcon_init_irq(struct device *dev, 813 struct sun4i_tcon *tcon) 814 { 815 struct platform_device *pdev = to_platform_device(dev); 816 int irq, ret; 817 818 irq = platform_get_irq(pdev, 0); 819 if (irq < 0) 820 return irq; 821 822 ret = devm_request_irq(dev, irq, sun4i_tcon_handler, 0, 823 dev_name(dev), tcon); 824 if (ret) { 825 dev_err(dev, "Couldn't request the IRQ\n"); 826 return ret; 827 } 828 829 return 0; 830 } 831 832 static const struct regmap_config sun4i_tcon_regmap_config = { 833 .reg_bits = 32, 834 .val_bits = 32, 835 .reg_stride = 4, 836 .max_register = 0x800, 837 }; 838 839 static int sun4i_tcon_init_regmap(struct device *dev, 840 struct sun4i_tcon *tcon) 841 { 842 struct platform_device *pdev = to_platform_device(dev); 843 void __iomem *regs; 844 845 regs = devm_platform_ioremap_resource(pdev, 0); 846 if (IS_ERR(regs)) 847 return PTR_ERR(regs); 848 849 tcon->regs = devm_regmap_init_mmio(dev, regs, 850 &sun4i_tcon_regmap_config); 851 if (IS_ERR(tcon->regs)) { 852 dev_err(dev, "Couldn't create the TCON regmap\n"); 853 return PTR_ERR(tcon->regs); 854 } 855 856 /* Make sure the TCON is disabled and all IRQs are off */ 857 regmap_write(tcon->regs, SUN4I_TCON_GCTL_REG, 0); 858 regmap_write(tcon->regs, SUN4I_TCON_GINT0_REG, 0); 859 regmap_write(tcon->regs, SUN4I_TCON_GINT1_REG, 0); 860 861 /* Disable IO lines and set them to tristate */ 862 regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, ~0); 863 regmap_write(tcon->regs, SUN4I_TCON1_IO_TRI_REG, ~0); 864 865 return 0; 866 } 867 868 /* 869 * On SoCs with the old display pipeline design (Display Engine 1.0), 870 * the TCON is always tied to just one backend. Hence we can traverse 871 * the of_graph upwards to find the backend our tcon is connected to, 872 * and take its ID as our own. 873 * 874 * We can either identify backends from their compatible strings, which 875 * means maintaining a large list of them. Or, since the backend is 876 * registered and binded before the TCON, we can just go through the 877 * list of registered backends and compare the device node. 878 * 879 * As the structures now store engines instead of backends, here this 880 * function in fact searches the corresponding engine, and the ID is 881 * requested via the get_id function of the engine. 882 */ 883 static struct sunxi_engine * 884 sun4i_tcon_find_engine_traverse(struct sun4i_drv *drv, 885 struct device_node *node, 886 u32 port_id) 887 { 888 struct device_node *port, *ep, *remote; 889 struct sunxi_engine *engine = ERR_PTR(-EINVAL); 890 u32 reg = 0; 891 892 port = of_graph_get_port_by_id(node, port_id); 893 if (!port) 894 return ERR_PTR(-EINVAL); 895 896 /* 897 * This only works if there is only one path from the TCON 898 * to any display engine. Otherwise the probe order of the 899 * TCONs and display engines is not guaranteed. They may 900 * either bind to the wrong one, or worse, bind to the same 901 * one if additional checks are not done. 902 * 903 * Bail out if there are multiple input connections. 904 */ 905 if (of_get_available_child_count(port) != 1) 906 goto out_put_port; 907 908 /* Get the first connection without specifying an ID */ 909 ep = of_get_next_available_child(port, NULL); 910 if (!ep) 911 goto out_put_port; 912 913 remote = of_graph_get_remote_port_parent(ep); 914 if (!remote) 915 goto out_put_ep; 916 917 /* does this node match any registered engines? */ 918 list_for_each_entry(engine, &drv->engine_list, list) 919 if (remote == engine->node) 920 goto out_put_remote; 921 922 /* 923 * According to device tree binding input ports have even id 924 * number and output ports have odd id. Since component with 925 * more than one input and one output (TCON TOP) exits, correct 926 * remote input id has to be calculated by subtracting 1 from 927 * remote output id. If this for some reason can't be done, 0 928 * is used as input port id. 929 */ 930 of_node_put(port); 931 port = of_graph_get_remote_port(ep); 932 if (!of_property_read_u32(port, "reg", ®) && reg > 0) 933 reg -= 1; 934 935 /* keep looking through upstream ports */ 936 engine = sun4i_tcon_find_engine_traverse(drv, remote, reg); 937 938 out_put_remote: 939 of_node_put(remote); 940 out_put_ep: 941 of_node_put(ep); 942 out_put_port: 943 of_node_put(port); 944 945 return engine; 946 } 947 948 /* 949 * The device tree binding says that the remote endpoint ID of any 950 * connection between components, up to and including the TCON, of 951 * the display pipeline should be equal to the actual ID of the local 952 * component. Thus we can look at any one of the input connections of 953 * the TCONs, and use that connection's remote endpoint ID as our own. 954 * 955 * Since the user of this function already finds the input port, 956 * the port is passed in directly without further checks. 957 */ 958 static int sun4i_tcon_of_get_id_from_port(struct device_node *port) 959 { 960 struct device_node *ep; 961 int ret = -EINVAL; 962 963 /* try finding an upstream endpoint */ 964 for_each_available_child_of_node(port, ep) { 965 struct device_node *remote; 966 u32 reg; 967 968 remote = of_graph_get_remote_endpoint(ep); 969 if (!remote) 970 continue; 971 972 ret = of_property_read_u32(remote, "reg", ®); 973 if (ret) 974 continue; 975 976 ret = reg; 977 } 978 979 return ret; 980 } 981 982 /* 983 * Once we know the TCON's id, we can look through the list of 984 * engines to find a matching one. We assume all engines have 985 * been probed and added to the list. 986 */ 987 static struct sunxi_engine *sun4i_tcon_get_engine_by_id(struct sun4i_drv *drv, 988 int id) 989 { 990 struct sunxi_engine *engine; 991 992 list_for_each_entry(engine, &drv->engine_list, list) 993 if (engine->id == id) 994 return engine; 995 996 return ERR_PTR(-EINVAL); 997 } 998 999 static bool sun4i_tcon_connected_to_tcon_top(struct device_node *node) 1000 { 1001 struct device_node *remote; 1002 bool ret = false; 1003 1004 remote = of_graph_get_remote_node(node, 0, -1); 1005 if (remote) { 1006 ret = !!(IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) && 1007 of_match_node(sun8i_tcon_top_of_table, remote)); 1008 of_node_put(remote); 1009 } 1010 1011 return ret; 1012 } 1013 1014 static int sun4i_tcon_get_index(struct sun4i_drv *drv) 1015 { 1016 struct list_head *pos; 1017 int size = 0; 1018 1019 /* 1020 * Because TCON is added to the list at the end of the probe 1021 * (after this function is called), index of the current TCON 1022 * will be same as current TCON list size. 1023 */ 1024 list_for_each(pos, &drv->tcon_list) 1025 ++size; 1026 1027 return size; 1028 } 1029 1030 /* 1031 * On SoCs with the old display pipeline design (Display Engine 1.0), 1032 * we assumed the TCON was always tied to just one backend. However 1033 * this proved not to be the case. On the A31, the TCON can select 1034 * either backend as its source. On the A20 (and likely on the A10), 1035 * the backend can choose which TCON to output to. 1036 * 1037 * The device tree binding says that the remote endpoint ID of any 1038 * connection between components, up to and including the TCON, of 1039 * the display pipeline should be equal to the actual ID of the local 1040 * component. Thus we should be able to look at any one of the input 1041 * connections of the TCONs, and use that connection's remote endpoint 1042 * ID as our own. 1043 * 1044 * However the connections between the backend and TCON were assumed 1045 * to be always singular, and their endpoit IDs were all incorrectly 1046 * set to 0. This means for these old device trees, we cannot just look 1047 * up the remote endpoint ID of a TCON input endpoint. TCON1 would be 1048 * incorrectly identified as TCON0. 1049 * 1050 * This function first checks if the TCON node has 2 input endpoints. 1051 * If so, then the device tree is a corrected version, and it will use 1052 * sun4i_tcon_of_get_id() and sun4i_tcon_get_engine_by_id() from above 1053 * to fetch the ID and engine directly. If not, then it is likely an 1054 * old device trees, where the endpoint IDs were incorrect, but did not 1055 * have endpoint connections between the backend and TCON across 1056 * different display pipelines. It will fall back to the old method of 1057 * traversing the of_graph to try and find a matching engine by device 1058 * node. 1059 * 1060 * In the case of single display pipeline device trees, either method 1061 * works. 1062 */ 1063 static struct sunxi_engine *sun4i_tcon_find_engine(struct sun4i_drv *drv, 1064 struct device_node *node) 1065 { 1066 struct device_node *port; 1067 struct sunxi_engine *engine; 1068 1069 port = of_graph_get_port_by_id(node, 0); 1070 if (!port) 1071 return ERR_PTR(-EINVAL); 1072 1073 /* 1074 * Is this a corrected device tree with cross pipeline 1075 * connections between the backend and TCON? 1076 */ 1077 if (of_get_child_count(port) > 1) { 1078 int id; 1079 1080 /* 1081 * When pipeline has the same number of TCONs and engines which 1082 * are represented by frontends/backends (DE1) or mixers (DE2), 1083 * we match them by their respective IDs. However, if pipeline 1084 * contains TCON TOP, chances are that there are either more 1085 * TCONs than engines (R40) or TCONs with non-consecutive ids. 1086 * (H6). In that case it's easier just use TCON index in list 1087 * as an id. That means that on R40, any 2 TCONs can be enabled 1088 * in DT out of 4 (there are 2 mixers). Due to the design of 1089 * TCON TOP, remaining 2 TCONs can't be connected to anything 1090 * anyway. 1091 */ 1092 if (sun4i_tcon_connected_to_tcon_top(node)) 1093 id = sun4i_tcon_get_index(drv); 1094 else 1095 id = sun4i_tcon_of_get_id_from_port(port); 1096 1097 /* Get our engine by matching our ID */ 1098 engine = sun4i_tcon_get_engine_by_id(drv, id); 1099 1100 of_node_put(port); 1101 return engine; 1102 } 1103 1104 /* Fallback to old method by traversing input endpoints */ 1105 of_node_put(port); 1106 return sun4i_tcon_find_engine_traverse(drv, node, 0); 1107 } 1108 1109 static int sun4i_tcon_bind(struct device *dev, struct device *master, 1110 void *data) 1111 { 1112 struct drm_device *drm = data; 1113 struct sun4i_drv *drv = drm->dev_private; 1114 struct sunxi_engine *engine; 1115 struct device_node *remote; 1116 struct sun4i_tcon *tcon; 1117 struct reset_control *edp_rstc; 1118 bool has_lvds_rst, has_lvds_alt, can_lvds; 1119 int ret; 1120 1121 engine = sun4i_tcon_find_engine(drv, dev->of_node); 1122 if (IS_ERR(engine)) { 1123 dev_err(dev, "Couldn't find matching engine\n"); 1124 return -EPROBE_DEFER; 1125 } 1126 1127 tcon = devm_kzalloc(dev, sizeof(*tcon), GFP_KERNEL); 1128 if (!tcon) 1129 return -ENOMEM; 1130 dev_set_drvdata(dev, tcon); 1131 tcon->drm = drm; 1132 tcon->dev = dev; 1133 tcon->id = engine->id; 1134 tcon->quirks = of_device_get_match_data(dev); 1135 1136 tcon->lcd_rst = devm_reset_control_get(dev, "lcd"); 1137 if (IS_ERR(tcon->lcd_rst)) { 1138 dev_err(dev, "Couldn't get our reset line\n"); 1139 return PTR_ERR(tcon->lcd_rst); 1140 } 1141 1142 if (tcon->quirks->needs_edp_reset) { 1143 edp_rstc = devm_reset_control_get_shared(dev, "edp"); 1144 if (IS_ERR(edp_rstc)) { 1145 dev_err(dev, "Couldn't get edp reset line\n"); 1146 return PTR_ERR(edp_rstc); 1147 } 1148 1149 ret = reset_control_deassert(edp_rstc); 1150 if (ret) { 1151 dev_err(dev, "Couldn't deassert edp reset line\n"); 1152 return ret; 1153 } 1154 } 1155 1156 /* Make sure our TCON is reset */ 1157 ret = reset_control_reset(tcon->lcd_rst); 1158 if (ret) { 1159 dev_err(dev, "Couldn't deassert our reset line\n"); 1160 return ret; 1161 } 1162 1163 if (tcon->quirks->supports_lvds) { 1164 /* 1165 * This can only be made optional since we've had DT 1166 * nodes without the LVDS reset properties. 1167 * 1168 * If the property is missing, just disable LVDS, and 1169 * print a warning. 1170 */ 1171 tcon->lvds_rst = devm_reset_control_get_optional(dev, "lvds"); 1172 if (IS_ERR(tcon->lvds_rst)) { 1173 dev_err(dev, "Couldn't get our reset line\n"); 1174 return PTR_ERR(tcon->lvds_rst); 1175 } else if (tcon->lvds_rst) { 1176 has_lvds_rst = true; 1177 reset_control_reset(tcon->lvds_rst); 1178 } else { 1179 has_lvds_rst = false; 1180 } 1181 1182 /* 1183 * This can only be made optional since we've had DT 1184 * nodes without the LVDS reset properties. 1185 * 1186 * If the property is missing, just disable LVDS, and 1187 * print a warning. 1188 */ 1189 if (tcon->quirks->has_lvds_alt) { 1190 tcon->lvds_pll = devm_clk_get(dev, "lvds-alt"); 1191 if (IS_ERR(tcon->lvds_pll)) { 1192 if (PTR_ERR(tcon->lvds_pll) == -ENOENT) { 1193 has_lvds_alt = false; 1194 } else { 1195 dev_err(dev, "Couldn't get the LVDS PLL\n"); 1196 return PTR_ERR(tcon->lvds_pll); 1197 } 1198 } else { 1199 has_lvds_alt = true; 1200 } 1201 } 1202 1203 if (!has_lvds_rst || 1204 (tcon->quirks->has_lvds_alt && !has_lvds_alt)) { 1205 dev_warn(dev, "Missing LVDS properties, Please upgrade your DT\n"); 1206 dev_warn(dev, "LVDS output disabled\n"); 1207 can_lvds = false; 1208 } else { 1209 can_lvds = true; 1210 } 1211 } else { 1212 can_lvds = false; 1213 } 1214 1215 ret = sun4i_tcon_init_clocks(dev, tcon); 1216 if (ret) { 1217 dev_err(dev, "Couldn't init our TCON clocks\n"); 1218 goto err_assert_reset; 1219 } 1220 1221 ret = sun4i_tcon_init_regmap(dev, tcon); 1222 if (ret) { 1223 dev_err(dev, "Couldn't init our TCON regmap\n"); 1224 goto err_assert_reset; 1225 } 1226 1227 if (tcon->quirks->has_channel_0) { 1228 ret = sun4i_dclk_create(dev, tcon); 1229 if (ret) { 1230 dev_err(dev, "Couldn't create our TCON dot clock\n"); 1231 goto err_assert_reset; 1232 } 1233 } 1234 1235 ret = sun4i_tcon_init_irq(dev, tcon); 1236 if (ret) { 1237 dev_err(dev, "Couldn't init our TCON interrupts\n"); 1238 goto err_free_dclk; 1239 } 1240 1241 tcon->crtc = sun4i_crtc_init(drm, engine, tcon); 1242 if (IS_ERR(tcon->crtc)) { 1243 dev_err(dev, "Couldn't create our CRTC\n"); 1244 ret = PTR_ERR(tcon->crtc); 1245 goto err_free_dclk; 1246 } 1247 1248 if (tcon->quirks->has_channel_0) { 1249 /* 1250 * If we have an LVDS panel connected to the TCON, we should 1251 * just probe the LVDS connector. Otherwise, just probe RGB as 1252 * we used to. 1253 */ 1254 remote = of_graph_get_remote_node(dev->of_node, 1, 0); 1255 if (of_device_is_compatible(remote, "panel-lvds")) 1256 if (can_lvds) 1257 ret = sun4i_lvds_init(drm, tcon); 1258 else 1259 ret = -EINVAL; 1260 else 1261 ret = sun4i_rgb_init(drm, tcon); 1262 of_node_put(remote); 1263 1264 if (ret < 0) 1265 goto err_free_dclk; 1266 } 1267 1268 if (tcon->quirks->needs_de_be_mux) { 1269 /* 1270 * We assume there is no dynamic muxing of backends 1271 * and TCONs, so we select the backend with same ID. 1272 * 1273 * While dynamic selection might be interesting, since 1274 * the CRTC is tied to the TCON, while the layers are 1275 * tied to the backends, this means, we will need to 1276 * switch between groups of layers. There might not be 1277 * a way to represent this constraint in DRM. 1278 */ 1279 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG, 1280 SUN4I_TCON0_CTL_SRC_SEL_MASK, 1281 tcon->id); 1282 regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, 1283 SUN4I_TCON1_CTL_SRC_SEL_MASK, 1284 tcon->id); 1285 } 1286 1287 list_add_tail(&tcon->list, &drv->tcon_list); 1288 1289 return 0; 1290 1291 err_free_dclk: 1292 if (tcon->quirks->has_channel_0) 1293 sun4i_dclk_free(tcon); 1294 err_assert_reset: 1295 reset_control_assert(tcon->lcd_rst); 1296 return ret; 1297 } 1298 1299 static void sun4i_tcon_unbind(struct device *dev, struct device *master, 1300 void *data) 1301 { 1302 struct sun4i_tcon *tcon = dev_get_drvdata(dev); 1303 1304 list_del(&tcon->list); 1305 if (tcon->quirks->has_channel_0) 1306 sun4i_dclk_free(tcon); 1307 } 1308 1309 static const struct component_ops sun4i_tcon_ops = { 1310 .bind = sun4i_tcon_bind, 1311 .unbind = sun4i_tcon_unbind, 1312 }; 1313 1314 static int sun4i_tcon_probe(struct platform_device *pdev) 1315 { 1316 struct device_node *node = pdev->dev.of_node; 1317 const struct sun4i_tcon_quirks *quirks; 1318 struct drm_bridge *bridge; 1319 struct drm_panel *panel; 1320 int ret; 1321 1322 quirks = of_device_get_match_data(&pdev->dev); 1323 1324 /* panels and bridges are present only on TCONs with channel 0 */ 1325 if (quirks->has_channel_0) { 1326 ret = drm_of_find_panel_or_bridge(node, 1, 0, &panel, &bridge); 1327 if (ret == -EPROBE_DEFER) 1328 return ret; 1329 } 1330 1331 return component_add(&pdev->dev, &sun4i_tcon_ops); 1332 } 1333 1334 static void sun4i_tcon_remove(struct platform_device *pdev) 1335 { 1336 component_del(&pdev->dev, &sun4i_tcon_ops); 1337 } 1338 1339 /* platform specific TCON muxing callbacks */ 1340 static int sun4i_a10_tcon_set_mux(struct sun4i_tcon *tcon, 1341 const struct drm_encoder *encoder) 1342 { 1343 struct sun4i_tcon *tcon0 = sun4i_get_tcon0(encoder->dev); 1344 u32 shift; 1345 1346 if (!tcon0) 1347 return -EINVAL; 1348 1349 switch (encoder->encoder_type) { 1350 case DRM_MODE_ENCODER_TMDS: 1351 /* HDMI */ 1352 shift = 8; 1353 break; 1354 default: 1355 return -EINVAL; 1356 } 1357 1358 regmap_update_bits(tcon0->regs, SUN4I_TCON_MUX_CTRL_REG, 1359 0x3 << shift, tcon->id << shift); 1360 1361 return 0; 1362 } 1363 1364 static int sun5i_a13_tcon_set_mux(struct sun4i_tcon *tcon, 1365 const struct drm_encoder *encoder) 1366 { 1367 u32 val; 1368 1369 if (encoder->encoder_type == DRM_MODE_ENCODER_TVDAC) 1370 val = 1; 1371 else 1372 val = 0; 1373 1374 /* 1375 * FIXME: Undocumented bits 1376 */ 1377 return regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, val); 1378 } 1379 1380 static int sun6i_tcon_set_mux(struct sun4i_tcon *tcon, 1381 const struct drm_encoder *encoder) 1382 { 1383 struct sun4i_tcon *tcon0 = sun4i_get_tcon0(encoder->dev); 1384 u32 shift; 1385 1386 if (!tcon0) 1387 return -EINVAL; 1388 1389 switch (encoder->encoder_type) { 1390 case DRM_MODE_ENCODER_TMDS: 1391 /* HDMI */ 1392 shift = 8; 1393 break; 1394 default: 1395 /* TODO A31 has MIPI DSI but A31s does not */ 1396 return -EINVAL; 1397 } 1398 1399 regmap_update_bits(tcon0->regs, SUN4I_TCON_MUX_CTRL_REG, 1400 0x3 << shift, tcon->id << shift); 1401 1402 return 0; 1403 } 1404 1405 static int sun8i_r40_tcon_tv_set_mux(struct sun4i_tcon *tcon, 1406 const struct drm_encoder *encoder) 1407 { 1408 struct device_node *port, *remote; 1409 struct platform_device *pdev; 1410 int id, ret; 1411 1412 /* find TCON TOP platform device and TCON id */ 1413 1414 port = of_graph_get_port_by_id(tcon->dev->of_node, 0); 1415 if (!port) 1416 return -EINVAL; 1417 1418 id = sun4i_tcon_of_get_id_from_port(port); 1419 of_node_put(port); 1420 1421 remote = of_graph_get_remote_node(tcon->dev->of_node, 0, -1); 1422 if (!remote) 1423 return -EINVAL; 1424 1425 pdev = of_find_device_by_node(remote); 1426 of_node_put(remote); 1427 if (!pdev) 1428 return -EINVAL; 1429 1430 if (IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) && 1431 encoder->encoder_type == DRM_MODE_ENCODER_TMDS) { 1432 ret = sun8i_tcon_top_set_hdmi_src(&pdev->dev, id); 1433 if (ret) { 1434 put_device(&pdev->dev); 1435 return ret; 1436 } 1437 } 1438 1439 if (IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP)) { 1440 ret = sun8i_tcon_top_de_config(&pdev->dev, tcon->id, id); 1441 if (ret) { 1442 put_device(&pdev->dev); 1443 return ret; 1444 } 1445 } 1446 1447 return 0; 1448 } 1449 1450 static const struct sun4i_tcon_quirks sun4i_a10_quirks = { 1451 .has_channel_0 = true, 1452 .has_channel_1 = true, 1453 .dclk_min_div = 4, 1454 .set_mux = sun4i_a10_tcon_set_mux, 1455 }; 1456 1457 static const struct sun4i_tcon_quirks sun5i_a13_quirks = { 1458 .has_channel_0 = true, 1459 .has_channel_1 = true, 1460 .dclk_min_div = 4, 1461 .set_mux = sun5i_a13_tcon_set_mux, 1462 }; 1463 1464 static const struct sun4i_tcon_quirks sun6i_a31_quirks = { 1465 .has_channel_0 = true, 1466 .has_channel_1 = true, 1467 .has_lvds_alt = true, 1468 .needs_de_be_mux = true, 1469 .dclk_min_div = 1, 1470 .set_mux = sun6i_tcon_set_mux, 1471 }; 1472 1473 static const struct sun4i_tcon_quirks sun6i_a31s_quirks = { 1474 .has_channel_0 = true, 1475 .has_channel_1 = true, 1476 .needs_de_be_mux = true, 1477 .dclk_min_div = 1, 1478 }; 1479 1480 static const struct sun4i_tcon_quirks sun7i_a20_tcon0_quirks = { 1481 .supports_lvds = true, 1482 .has_channel_0 = true, 1483 .has_channel_1 = true, 1484 .dclk_min_div = 4, 1485 /* Same display pipeline structure as A10 */ 1486 .set_mux = sun4i_a10_tcon_set_mux, 1487 .setup_lvds_phy = sun4i_tcon_setup_lvds_phy, 1488 }; 1489 1490 static const struct sun4i_tcon_quirks sun7i_a20_quirks = { 1491 .has_channel_0 = true, 1492 .has_channel_1 = true, 1493 .dclk_min_div = 4, 1494 /* Same display pipeline structure as A10 */ 1495 .set_mux = sun4i_a10_tcon_set_mux, 1496 }; 1497 1498 static const struct sun4i_tcon_quirks sun8i_a33_quirks = { 1499 .has_channel_0 = true, 1500 .has_lvds_alt = true, 1501 .dclk_min_div = 1, 1502 .setup_lvds_phy = sun6i_tcon_setup_lvds_phy, 1503 .supports_lvds = true, 1504 }; 1505 1506 static const struct sun4i_tcon_quirks sun8i_a83t_lcd_quirks = { 1507 .supports_lvds = true, 1508 .has_channel_0 = true, 1509 .dclk_min_div = 1, 1510 .setup_lvds_phy = sun6i_tcon_setup_lvds_phy, 1511 }; 1512 1513 static const struct sun4i_tcon_quirks sun8i_a83t_tv_quirks = { 1514 .has_channel_1 = true, 1515 }; 1516 1517 static const struct sun4i_tcon_quirks sun8i_r40_tv_quirks = { 1518 .has_channel_1 = true, 1519 .polarity_in_ch0 = true, 1520 .set_mux = sun8i_r40_tcon_tv_set_mux, 1521 }; 1522 1523 static const struct sun4i_tcon_quirks sun8i_v3s_quirks = { 1524 .has_channel_0 = true, 1525 .dclk_min_div = 1, 1526 }; 1527 1528 static const struct sun4i_tcon_quirks sun9i_a80_tcon_lcd_quirks = { 1529 .has_channel_0 = true, 1530 .needs_edp_reset = true, 1531 .dclk_min_div = 1, 1532 }; 1533 1534 static const struct sun4i_tcon_quirks sun9i_a80_tcon_tv_quirks = { 1535 .has_channel_1 = true, 1536 .needs_edp_reset = true, 1537 }; 1538 1539 static const struct sun4i_tcon_quirks sun20i_d1_lcd_quirks = { 1540 .has_channel_0 = true, 1541 .dclk_min_div = 1, 1542 .set_mux = sun8i_r40_tcon_tv_set_mux, 1543 }; 1544 1545 /* sun4i_drv uses this list to check if a device node is a TCON */ 1546 const struct of_device_id sun4i_tcon_of_table[] = { 1547 { .compatible = "allwinner,sun4i-a10-tcon", .data = &sun4i_a10_quirks }, 1548 { .compatible = "allwinner,sun5i-a13-tcon", .data = &sun5i_a13_quirks }, 1549 { .compatible = "allwinner,sun6i-a31-tcon", .data = &sun6i_a31_quirks }, 1550 { .compatible = "allwinner,sun6i-a31s-tcon", .data = &sun6i_a31s_quirks }, 1551 { .compatible = "allwinner,sun7i-a20-tcon", .data = &sun7i_a20_quirks }, 1552 { .compatible = "allwinner,sun7i-a20-tcon0", .data = &sun7i_a20_tcon0_quirks }, 1553 { .compatible = "allwinner,sun7i-a20-tcon1", .data = &sun7i_a20_quirks }, 1554 { .compatible = "allwinner,sun8i-a23-tcon", .data = &sun8i_a33_quirks }, 1555 { .compatible = "allwinner,sun8i-a33-tcon", .data = &sun8i_a33_quirks }, 1556 { .compatible = "allwinner,sun8i-a83t-tcon-lcd", .data = &sun8i_a83t_lcd_quirks }, 1557 { .compatible = "allwinner,sun8i-a83t-tcon-tv", .data = &sun8i_a83t_tv_quirks }, 1558 { .compatible = "allwinner,sun8i-r40-tcon-tv", .data = &sun8i_r40_tv_quirks }, 1559 { .compatible = "allwinner,sun8i-v3s-tcon", .data = &sun8i_v3s_quirks }, 1560 { .compatible = "allwinner,sun9i-a80-tcon-lcd", .data = &sun9i_a80_tcon_lcd_quirks }, 1561 { .compatible = "allwinner,sun9i-a80-tcon-tv", .data = &sun9i_a80_tcon_tv_quirks }, 1562 { .compatible = "allwinner,sun20i-d1-tcon-lcd", .data = &sun20i_d1_lcd_quirks }, 1563 { .compatible = "allwinner,sun20i-d1-tcon-tv", .data = &sun8i_r40_tv_quirks }, 1564 { } 1565 }; 1566 MODULE_DEVICE_TABLE(of, sun4i_tcon_of_table); 1567 EXPORT_SYMBOL(sun4i_tcon_of_table); 1568 1569 static struct platform_driver sun4i_tcon_platform_driver = { 1570 .probe = sun4i_tcon_probe, 1571 .remove_new = sun4i_tcon_remove, 1572 .driver = { 1573 .name = "sun4i-tcon", 1574 .of_match_table = sun4i_tcon_of_table, 1575 }, 1576 }; 1577 module_platform_driver(sun4i_tcon_platform_driver); 1578 1579 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 1580 MODULE_DESCRIPTION("Allwinner A10 Timing Controller Driver"); 1581 MODULE_LICENSE("GPL"); 1582