1 /* 2 * Copyright (C) 2012 Texas Instruments 3 * Author: Rob Clark <robdclark@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include "drm_flip_work.h" 19 #include <drm/drm_plane_helper.h> 20 21 #include "tilcdc_drv.h" 22 #include "tilcdc_regs.h" 23 24 #define TILCDC_VBLANK_SAFETY_THRESHOLD_US 1000 25 26 struct tilcdc_crtc { 27 struct drm_crtc base; 28 29 const struct tilcdc_panel_info *info; 30 struct drm_pending_vblank_event *event; 31 int dpms; 32 wait_queue_head_t frame_done_wq; 33 bool frame_done; 34 spinlock_t irq_lock; 35 36 ktime_t last_vblank; 37 38 struct drm_framebuffer *curr_fb; 39 struct drm_framebuffer *next_fb; 40 41 /* for deferred fb unref's: */ 42 struct drm_flip_work unref_work; 43 44 /* Only set if an external encoder is connected */ 45 bool simulate_vesa_sync; 46 47 int sync_lost_count; 48 bool frame_intact; 49 }; 50 #define to_tilcdc_crtc(x) container_of(x, struct tilcdc_crtc, base) 51 52 static void unref_worker(struct drm_flip_work *work, void *val) 53 { 54 struct tilcdc_crtc *tilcdc_crtc = 55 container_of(work, struct tilcdc_crtc, unref_work); 56 struct drm_device *dev = tilcdc_crtc->base.dev; 57 58 mutex_lock(&dev->mode_config.mutex); 59 drm_framebuffer_unreference(val); 60 mutex_unlock(&dev->mode_config.mutex); 61 } 62 63 static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb) 64 { 65 struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); 66 struct drm_device *dev = crtc->dev; 67 struct drm_gem_cma_object *gem; 68 unsigned int depth, bpp; 69 dma_addr_t start, end; 70 71 drm_fb_get_bpp_depth(fb->pixel_format, &depth, &bpp); 72 gem = drm_fb_cma_get_gem_obj(fb, 0); 73 74 start = gem->paddr + fb->offsets[0] + 75 crtc->y * fb->pitches[0] + 76 crtc->x * bpp / 8; 77 78 end = start + (crtc->mode.vdisplay * fb->pitches[0]); 79 80 tilcdc_write(dev, LCDC_DMA_FB_BASE_ADDR_0_REG, start); 81 tilcdc_write(dev, LCDC_DMA_FB_CEILING_ADDR_0_REG, end); 82 83 if (tilcdc_crtc->curr_fb) 84 drm_flip_work_queue(&tilcdc_crtc->unref_work, 85 tilcdc_crtc->curr_fb); 86 87 tilcdc_crtc->curr_fb = fb; 88 } 89 90 static void reset(struct drm_crtc *crtc) 91 { 92 struct drm_device *dev = crtc->dev; 93 struct tilcdc_drm_private *priv = dev->dev_private; 94 95 if (priv->rev != 2) 96 return; 97 98 tilcdc_set(dev, LCDC_CLK_RESET_REG, LCDC_CLK_MAIN_RESET); 99 usleep_range(250, 1000); 100 tilcdc_clear(dev, LCDC_CLK_RESET_REG, LCDC_CLK_MAIN_RESET); 101 } 102 103 static void start(struct drm_crtc *crtc) 104 { 105 struct drm_device *dev = crtc->dev; 106 107 reset(crtc); 108 109 tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_DUAL_FRAME_BUFFER_ENABLE); 110 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_PALETTE_LOAD_MODE(DATA_ONLY)); 111 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE); 112 } 113 114 static void stop(struct drm_crtc *crtc) 115 { 116 struct drm_device *dev = crtc->dev; 117 118 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE); 119 } 120 121 static void tilcdc_crtc_destroy(struct drm_crtc *crtc) 122 { 123 struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); 124 125 tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF); 126 127 of_node_put(crtc->port); 128 drm_crtc_cleanup(crtc); 129 drm_flip_work_cleanup(&tilcdc_crtc->unref_work); 130 } 131 132 static int tilcdc_verify_fb(struct drm_crtc *crtc, struct drm_framebuffer *fb) 133 { 134 struct drm_device *dev = crtc->dev; 135 unsigned int depth, bpp; 136 137 drm_fb_get_bpp_depth(fb->pixel_format, &depth, &bpp); 138 139 if (fb->pitches[0] != crtc->mode.hdisplay * bpp / 8) { 140 dev_err(dev->dev, 141 "Invalid pitch: fb and crtc widths must be the same"); 142 return -EINVAL; 143 } 144 145 return 0; 146 } 147 148 static int tilcdc_crtc_page_flip(struct drm_crtc *crtc, 149 struct drm_framebuffer *fb, 150 struct drm_pending_vblank_event *event, 151 uint32_t page_flip_flags) 152 { 153 struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); 154 struct drm_device *dev = crtc->dev; 155 int r; 156 unsigned long flags; 157 s64 tdiff; 158 ktime_t next_vblank; 159 160 r = tilcdc_verify_fb(crtc, fb); 161 if (r) 162 return r; 163 164 if (tilcdc_crtc->event) { 165 dev_err(dev->dev, "already pending page flip!\n"); 166 return -EBUSY; 167 } 168 169 drm_framebuffer_reference(fb); 170 171 crtc->primary->fb = fb; 172 173 pm_runtime_get_sync(dev->dev); 174 175 spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags); 176 177 next_vblank = ktime_add_us(tilcdc_crtc->last_vblank, 178 1000000 / crtc->hwmode.vrefresh); 179 180 tdiff = ktime_to_us(ktime_sub(next_vblank, ktime_get())); 181 182 if (tdiff >= TILCDC_VBLANK_SAFETY_THRESHOLD_US) 183 set_scanout(crtc, fb); 184 else 185 tilcdc_crtc->next_fb = fb; 186 187 tilcdc_crtc->event = event; 188 189 spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags); 190 191 pm_runtime_put_sync(dev->dev); 192 193 return 0; 194 } 195 196 void tilcdc_crtc_dpms(struct drm_crtc *crtc, int mode) 197 { 198 struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); 199 struct drm_device *dev = crtc->dev; 200 struct tilcdc_drm_private *priv = dev->dev_private; 201 202 /* we really only care about on or off: */ 203 if (mode != DRM_MODE_DPMS_ON) 204 mode = DRM_MODE_DPMS_OFF; 205 206 if (tilcdc_crtc->dpms == mode) 207 return; 208 209 tilcdc_crtc->dpms = mode; 210 211 if (mode == DRM_MODE_DPMS_ON) { 212 pm_runtime_get_sync(dev->dev); 213 start(crtc); 214 } else { 215 tilcdc_crtc->frame_done = false; 216 stop(crtc); 217 218 /* 219 * if necessary wait for framedone irq which will still come 220 * before putting things to sleep.. 221 */ 222 if (priv->rev == 2) { 223 int ret = wait_event_timeout( 224 tilcdc_crtc->frame_done_wq, 225 tilcdc_crtc->frame_done, 226 msecs_to_jiffies(50)); 227 if (ret == 0) 228 dev_err(dev->dev, "timeout waiting for framedone\n"); 229 } 230 231 pm_runtime_put_sync(dev->dev); 232 233 if (tilcdc_crtc->next_fb) { 234 drm_flip_work_queue(&tilcdc_crtc->unref_work, 235 tilcdc_crtc->next_fb); 236 tilcdc_crtc->next_fb = NULL; 237 } 238 239 if (tilcdc_crtc->curr_fb) { 240 drm_flip_work_queue(&tilcdc_crtc->unref_work, 241 tilcdc_crtc->curr_fb); 242 tilcdc_crtc->curr_fb = NULL; 243 } 244 245 drm_flip_work_commit(&tilcdc_crtc->unref_work, priv->wq); 246 } 247 } 248 249 static bool tilcdc_crtc_mode_fixup(struct drm_crtc *crtc, 250 const struct drm_display_mode *mode, 251 struct drm_display_mode *adjusted_mode) 252 { 253 struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); 254 255 if (!tilcdc_crtc->simulate_vesa_sync) 256 return true; 257 258 /* 259 * tilcdc does not generate VESA-compliant sync but aligns 260 * VS on the second edge of HS instead of first edge. 261 * We use adjusted_mode, to fixup sync by aligning both rising 262 * edges and add HSKEW offset to fix the sync. 263 */ 264 adjusted_mode->hskew = mode->hsync_end - mode->hsync_start; 265 adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW; 266 267 if (mode->flags & DRM_MODE_FLAG_NHSYNC) { 268 adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC; 269 adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC; 270 } else { 271 adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC; 272 adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC; 273 } 274 275 return true; 276 } 277 278 static void tilcdc_crtc_prepare(struct drm_crtc *crtc) 279 { 280 tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF); 281 } 282 283 static void tilcdc_crtc_commit(struct drm_crtc *crtc) 284 { 285 tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_ON); 286 } 287 288 static int tilcdc_crtc_mode_set(struct drm_crtc *crtc, 289 struct drm_display_mode *mode, 290 struct drm_display_mode *adjusted_mode, 291 int x, int y, 292 struct drm_framebuffer *old_fb) 293 { 294 struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); 295 struct drm_device *dev = crtc->dev; 296 struct tilcdc_drm_private *priv = dev->dev_private; 297 const struct tilcdc_panel_info *info = tilcdc_crtc->info; 298 uint32_t reg, hbp, hfp, hsw, vbp, vfp, vsw; 299 int ret; 300 301 ret = tilcdc_crtc_mode_valid(crtc, mode); 302 if (WARN_ON(ret)) 303 return ret; 304 305 if (WARN_ON(!info)) 306 return -EINVAL; 307 308 ret = tilcdc_verify_fb(crtc, crtc->primary->fb); 309 if (ret) 310 return ret; 311 312 pm_runtime_get_sync(dev->dev); 313 314 /* Configure the Burst Size and fifo threshold of DMA: */ 315 reg = tilcdc_read(dev, LCDC_DMA_CTRL_REG) & ~0x00000770; 316 switch (info->dma_burst_sz) { 317 case 1: 318 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_1); 319 break; 320 case 2: 321 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_2); 322 break; 323 case 4: 324 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_4); 325 break; 326 case 8: 327 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_8); 328 break; 329 case 16: 330 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_16); 331 break; 332 default: 333 return -EINVAL; 334 } 335 reg |= (info->fifo_th << 8); 336 tilcdc_write(dev, LCDC_DMA_CTRL_REG, reg); 337 338 /* Configure timings: */ 339 hbp = mode->htotal - mode->hsync_end; 340 hfp = mode->hsync_start - mode->hdisplay; 341 hsw = mode->hsync_end - mode->hsync_start; 342 vbp = mode->vtotal - mode->vsync_end; 343 vfp = mode->vsync_start - mode->vdisplay; 344 vsw = mode->vsync_end - mode->vsync_start; 345 346 DBG("%dx%d, hbp=%u, hfp=%u, hsw=%u, vbp=%u, vfp=%u, vsw=%u", 347 mode->hdisplay, mode->vdisplay, hbp, hfp, hsw, vbp, vfp, vsw); 348 349 /* Configure the AC Bias Period and Number of Transitions per Interrupt: */ 350 reg = tilcdc_read(dev, LCDC_RASTER_TIMING_2_REG) & ~0x000fff00; 351 reg |= LCDC_AC_BIAS_FREQUENCY(info->ac_bias) | 352 LCDC_AC_BIAS_TRANSITIONS_PER_INT(info->ac_bias_intrpt); 353 354 /* 355 * subtract one from hfp, hbp, hsw because the hardware uses 356 * a value of 0 as 1 357 */ 358 if (priv->rev == 2) { 359 /* clear bits we're going to set */ 360 reg &= ~0x78000033; 361 reg |= ((hfp-1) & 0x300) >> 8; 362 reg |= ((hbp-1) & 0x300) >> 4; 363 reg |= ((hsw-1) & 0x3c0) << 21; 364 } 365 tilcdc_write(dev, LCDC_RASTER_TIMING_2_REG, reg); 366 367 reg = (((mode->hdisplay >> 4) - 1) << 4) | 368 (((hbp-1) & 0xff) << 24) | 369 (((hfp-1) & 0xff) << 16) | 370 (((hsw-1) & 0x3f) << 10); 371 if (priv->rev == 2) 372 reg |= (((mode->hdisplay >> 4) - 1) & 0x40) >> 3; 373 tilcdc_write(dev, LCDC_RASTER_TIMING_0_REG, reg); 374 375 reg = ((mode->vdisplay - 1) & 0x3ff) | 376 ((vbp & 0xff) << 24) | 377 ((vfp & 0xff) << 16) | 378 (((vsw-1) & 0x3f) << 10); 379 tilcdc_write(dev, LCDC_RASTER_TIMING_1_REG, reg); 380 381 /* 382 * be sure to set Bit 10 for the V2 LCDC controller, 383 * otherwise limited to 1024 pixels width, stopping 384 * 1920x1080 being suppoted. 385 */ 386 if (priv->rev == 2) { 387 if ((mode->vdisplay - 1) & 0x400) { 388 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, 389 LCDC_LPP_B10); 390 } else { 391 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, 392 LCDC_LPP_B10); 393 } 394 } 395 396 /* Configure display type: */ 397 reg = tilcdc_read(dev, LCDC_RASTER_CTRL_REG) & 398 ~(LCDC_TFT_MODE | LCDC_MONO_8BIT_MODE | LCDC_MONOCHROME_MODE | 399 LCDC_V2_TFT_24BPP_MODE | LCDC_V2_TFT_24BPP_UNPACK | 0x000ff000); 400 reg |= LCDC_TFT_MODE; /* no monochrome/passive support */ 401 if (info->tft_alt_mode) 402 reg |= LCDC_TFT_ALT_ENABLE; 403 if (priv->rev == 2) { 404 unsigned int depth, bpp; 405 406 drm_fb_get_bpp_depth(crtc->primary->fb->pixel_format, &depth, &bpp); 407 switch (bpp) { 408 case 16: 409 break; 410 case 32: 411 reg |= LCDC_V2_TFT_24BPP_UNPACK; 412 /* fallthrough */ 413 case 24: 414 reg |= LCDC_V2_TFT_24BPP_MODE; 415 break; 416 default: 417 dev_err(dev->dev, "invalid pixel format\n"); 418 return -EINVAL; 419 } 420 } 421 reg |= info->fdd < 12; 422 tilcdc_write(dev, LCDC_RASTER_CTRL_REG, reg); 423 424 if (info->invert_pxl_clk) 425 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK); 426 else 427 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK); 428 429 if (info->sync_ctrl) 430 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL); 431 else 432 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL); 433 434 if (info->sync_edge) 435 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE); 436 else 437 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE); 438 439 /* 440 * use value from adjusted_mode here as this might have been 441 * changed as part of the fixup for slave encoders to solve the 442 * issue where tilcdc timings are not VESA compliant 443 */ 444 if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC) 445 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_HSYNC); 446 else 447 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_HSYNC); 448 449 if (mode->flags & DRM_MODE_FLAG_NVSYNC) 450 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_VSYNC); 451 else 452 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_VSYNC); 453 454 if (info->raster_order) 455 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ORDER); 456 else 457 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ORDER); 458 459 drm_framebuffer_reference(crtc->primary->fb); 460 461 set_scanout(crtc, crtc->primary->fb); 462 463 tilcdc_crtc_update_clk(crtc); 464 465 pm_runtime_put_sync(dev->dev); 466 467 return 0; 468 } 469 470 static int tilcdc_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y, 471 struct drm_framebuffer *old_fb) 472 { 473 struct drm_device *dev = crtc->dev; 474 int r; 475 476 r = tilcdc_verify_fb(crtc, crtc->primary->fb); 477 if (r) 478 return r; 479 480 drm_framebuffer_reference(crtc->primary->fb); 481 482 pm_runtime_get_sync(dev->dev); 483 484 set_scanout(crtc, crtc->primary->fb); 485 486 pm_runtime_put_sync(dev->dev); 487 488 return 0; 489 } 490 491 static const struct drm_crtc_funcs tilcdc_crtc_funcs = { 492 .destroy = tilcdc_crtc_destroy, 493 .set_config = drm_crtc_helper_set_config, 494 .page_flip = tilcdc_crtc_page_flip, 495 }; 496 497 static const struct drm_crtc_helper_funcs tilcdc_crtc_helper_funcs = { 498 .dpms = tilcdc_crtc_dpms, 499 .mode_fixup = tilcdc_crtc_mode_fixup, 500 .prepare = tilcdc_crtc_prepare, 501 .commit = tilcdc_crtc_commit, 502 .mode_set = tilcdc_crtc_mode_set, 503 .mode_set_base = tilcdc_crtc_mode_set_base, 504 }; 505 506 int tilcdc_crtc_max_width(struct drm_crtc *crtc) 507 { 508 struct drm_device *dev = crtc->dev; 509 struct tilcdc_drm_private *priv = dev->dev_private; 510 int max_width = 0; 511 512 if (priv->rev == 1) 513 max_width = 1024; 514 else if (priv->rev == 2) 515 max_width = 2048; 516 517 return max_width; 518 } 519 520 int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode) 521 { 522 struct tilcdc_drm_private *priv = crtc->dev->dev_private; 523 unsigned int bandwidth; 524 uint32_t hbp, hfp, hsw, vbp, vfp, vsw; 525 526 /* 527 * check to see if the width is within the range that 528 * the LCD Controller physically supports 529 */ 530 if (mode->hdisplay > tilcdc_crtc_max_width(crtc)) 531 return MODE_VIRTUAL_X; 532 533 /* width must be multiple of 16 */ 534 if (mode->hdisplay & 0xf) 535 return MODE_VIRTUAL_X; 536 537 if (mode->vdisplay > 2048) 538 return MODE_VIRTUAL_Y; 539 540 DBG("Processing mode %dx%d@%d with pixel clock %d", 541 mode->hdisplay, mode->vdisplay, 542 drm_mode_vrefresh(mode), mode->clock); 543 544 hbp = mode->htotal - mode->hsync_end; 545 hfp = mode->hsync_start - mode->hdisplay; 546 hsw = mode->hsync_end - mode->hsync_start; 547 vbp = mode->vtotal - mode->vsync_end; 548 vfp = mode->vsync_start - mode->vdisplay; 549 vsw = mode->vsync_end - mode->vsync_start; 550 551 if ((hbp-1) & ~0x3ff) { 552 DBG("Pruning mode: Horizontal Back Porch out of range"); 553 return MODE_HBLANK_WIDE; 554 } 555 556 if ((hfp-1) & ~0x3ff) { 557 DBG("Pruning mode: Horizontal Front Porch out of range"); 558 return MODE_HBLANK_WIDE; 559 } 560 561 if ((hsw-1) & ~0x3ff) { 562 DBG("Pruning mode: Horizontal Sync Width out of range"); 563 return MODE_HSYNC_WIDE; 564 } 565 566 if (vbp & ~0xff) { 567 DBG("Pruning mode: Vertical Back Porch out of range"); 568 return MODE_VBLANK_WIDE; 569 } 570 571 if (vfp & ~0xff) { 572 DBG("Pruning mode: Vertical Front Porch out of range"); 573 return MODE_VBLANK_WIDE; 574 } 575 576 if ((vsw-1) & ~0x3f) { 577 DBG("Pruning mode: Vertical Sync Width out of range"); 578 return MODE_VSYNC_WIDE; 579 } 580 581 /* 582 * some devices have a maximum allowed pixel clock 583 * configured from the DT 584 */ 585 if (mode->clock > priv->max_pixelclock) { 586 DBG("Pruning mode: pixel clock too high"); 587 return MODE_CLOCK_HIGH; 588 } 589 590 /* 591 * some devices further limit the max horizontal resolution 592 * configured from the DT 593 */ 594 if (mode->hdisplay > priv->max_width) 595 return MODE_BAD_WIDTH; 596 597 /* filter out modes that would require too much memory bandwidth: */ 598 bandwidth = mode->hdisplay * mode->vdisplay * 599 drm_mode_vrefresh(mode); 600 if (bandwidth > priv->max_bandwidth) { 601 DBG("Pruning mode: exceeds defined bandwidth limit"); 602 return MODE_BAD; 603 } 604 605 return MODE_OK; 606 } 607 608 void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc, 609 const struct tilcdc_panel_info *info) 610 { 611 struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); 612 tilcdc_crtc->info = info; 613 } 614 615 void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc, 616 bool simulate_vesa_sync) 617 { 618 struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); 619 620 tilcdc_crtc->simulate_vesa_sync = simulate_vesa_sync; 621 } 622 623 void tilcdc_crtc_update_clk(struct drm_crtc *crtc) 624 { 625 struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); 626 struct drm_device *dev = crtc->dev; 627 struct tilcdc_drm_private *priv = dev->dev_private; 628 int dpms = tilcdc_crtc->dpms; 629 unsigned long lcd_clk; 630 const unsigned clkdiv = 2; /* using a fixed divider of 2 */ 631 int ret; 632 633 pm_runtime_get_sync(dev->dev); 634 635 if (dpms == DRM_MODE_DPMS_ON) 636 tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF); 637 638 /* mode.clock is in KHz, set_rate wants parameter in Hz */ 639 ret = clk_set_rate(priv->clk, crtc->mode.clock * 1000 * clkdiv); 640 if (ret < 0) { 641 dev_err(dev->dev, "failed to set display clock rate to: %d\n", 642 crtc->mode.clock); 643 goto out; 644 } 645 646 lcd_clk = clk_get_rate(priv->clk); 647 648 DBG("lcd_clk=%lu, mode clock=%d, div=%u", 649 lcd_clk, crtc->mode.clock, clkdiv); 650 651 /* Configure the LCD clock divisor. */ 652 tilcdc_write(dev, LCDC_CTRL_REG, LCDC_CLK_DIVISOR(clkdiv) | 653 LCDC_RASTER_MODE); 654 655 if (priv->rev == 2) 656 tilcdc_set(dev, LCDC_CLK_ENABLE_REG, 657 LCDC_V2_DMA_CLK_EN | LCDC_V2_LIDD_CLK_EN | 658 LCDC_V2_CORE_CLK_EN); 659 660 if (dpms == DRM_MODE_DPMS_ON) 661 tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_ON); 662 663 out: 664 pm_runtime_put_sync(dev->dev); 665 } 666 667 #define SYNC_LOST_COUNT_LIMIT 50 668 669 irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc) 670 { 671 struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); 672 struct drm_device *dev = crtc->dev; 673 struct tilcdc_drm_private *priv = dev->dev_private; 674 uint32_t stat; 675 676 stat = tilcdc_read_irqstatus(dev); 677 tilcdc_clear_irqstatus(dev, stat); 678 679 if (stat & LCDC_END_OF_FRAME0) { 680 unsigned long flags; 681 bool skip_event = false; 682 ktime_t now; 683 684 now = ktime_get(); 685 686 drm_flip_work_commit(&tilcdc_crtc->unref_work, priv->wq); 687 688 spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags); 689 690 tilcdc_crtc->last_vblank = now; 691 692 if (tilcdc_crtc->next_fb) { 693 set_scanout(crtc, tilcdc_crtc->next_fb); 694 tilcdc_crtc->next_fb = NULL; 695 skip_event = true; 696 } 697 698 spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags); 699 700 drm_handle_vblank(dev, 0); 701 702 if (!skip_event) { 703 struct drm_pending_vblank_event *event; 704 705 spin_lock_irqsave(&dev->event_lock, flags); 706 707 event = tilcdc_crtc->event; 708 tilcdc_crtc->event = NULL; 709 if (event) 710 drm_crtc_send_vblank_event(crtc, event); 711 712 spin_unlock_irqrestore(&dev->event_lock, flags); 713 } 714 715 if (tilcdc_crtc->frame_intact) 716 tilcdc_crtc->sync_lost_count = 0; 717 else 718 tilcdc_crtc->frame_intact = true; 719 } 720 721 if (priv->rev == 2) { 722 if (stat & LCDC_FRAME_DONE) { 723 tilcdc_crtc->frame_done = true; 724 wake_up(&tilcdc_crtc->frame_done_wq); 725 } 726 tilcdc_write(dev, LCDC_END_OF_INT_IND_REG, 0); 727 } 728 729 if (stat & LCDC_SYNC_LOST) { 730 dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost", 731 __func__, stat); 732 tilcdc_crtc->frame_intact = false; 733 if (tilcdc_crtc->sync_lost_count++ > SYNC_LOST_COUNT_LIMIT) { 734 dev_err(dev->dev, 735 "%s(0x%08x): Sync lost flood detected, disabling the interrupt", 736 __func__, stat); 737 tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG, 738 LCDC_SYNC_LOST); 739 } 740 } 741 742 if (stat & LCDC_FIFO_UNDERFLOW) 743 dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underfow", 744 __func__, stat); 745 746 return IRQ_HANDLED; 747 } 748 749 struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev) 750 { 751 struct tilcdc_drm_private *priv = dev->dev_private; 752 struct tilcdc_crtc *tilcdc_crtc; 753 struct drm_crtc *crtc; 754 int ret; 755 756 tilcdc_crtc = devm_kzalloc(dev->dev, sizeof(*tilcdc_crtc), GFP_KERNEL); 757 if (!tilcdc_crtc) { 758 dev_err(dev->dev, "allocation failed\n"); 759 return NULL; 760 } 761 762 crtc = &tilcdc_crtc->base; 763 764 tilcdc_crtc->dpms = DRM_MODE_DPMS_OFF; 765 init_waitqueue_head(&tilcdc_crtc->frame_done_wq); 766 767 drm_flip_work_init(&tilcdc_crtc->unref_work, 768 "unref", unref_worker); 769 770 spin_lock_init(&tilcdc_crtc->irq_lock); 771 772 ret = drm_crtc_init(dev, crtc, &tilcdc_crtc_funcs); 773 if (ret < 0) 774 goto fail; 775 776 drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs); 777 778 if (priv->is_componentized) { 779 struct device_node *ports = 780 of_get_child_by_name(dev->dev->of_node, "ports"); 781 782 if (ports) { 783 crtc->port = of_get_child_by_name(ports, "port"); 784 of_node_put(ports); 785 } else { 786 crtc->port = 787 of_get_child_by_name(dev->dev->of_node, "port"); 788 } 789 if (!crtc->port) { /* This should never happen */ 790 dev_err(dev->dev, "Port node not found in %s\n", 791 dev->dev->of_node->full_name); 792 goto fail; 793 } 794 } 795 796 return crtc; 797 798 fail: 799 tilcdc_crtc_destroy(crtc); 800 return NULL; 801 } 802