drivers/gpu/drm/tilcdc/tilcdc_crtc.c

   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 }