drivers/gpu/drm/tilcdc/tilcdc_crtc.c

   1 /*
   2  * Copyright (C) 2012 Texas Instruments
   3  * Author: Rob Clark <[email protected]>
   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 #include <drm/drm_atomic_helper.h>
  21 #include <linux/workqueue.h>
  22
  23 #include "tilcdc_drv.h"
  24 #include "tilcdc_regs.h"
  25
  26 #define TILCDC_VBLANK_SAFETY_THRESHOLD_US 1000
  27
  28 struct tilcdc_crtc {
  29         struct drm_crtc base;
  30
  31         struct drm_plane primary;
  32         const struct tilcdc_panel_info *info;
  33         struct drm_pending_vblank_event *event;
  34         bool enabled;
  35         wait_queue_head_t frame_done_wq;
  36         bool frame_done;
  37         spinlock_t irq_lock;
  38
  39         unsigned int lcd_fck_rate;
  40
  41         ktime_t last_vblank;
  42
  43         struct drm_framebuffer *curr_fb;
  44         struct drm_framebuffer *next_fb;
  45
  46         /* for deferred fb unref's: */
  47         struct drm_flip_work unref_work;
  48
  49         /* Only set if an external encoder is connected */
  50         bool simulate_vesa_sync;
  51
  52         int sync_lost_count;
  53         bool frame_intact;
  54 };
  55 #define to_tilcdc_crtc(x) container_of(x, struct tilcdc_crtc, base)
  56
  57 static void unref_worker(struct drm_flip_work *work, void *val)
  58 {
  59         struct tilcdc_crtc *tilcdc_crtc =
  60                 container_of(work, struct tilcdc_crtc, unref_work);
  61         struct drm_device *dev = tilcdc_crtc->base.dev;
  62
  63         mutex_lock(&dev->mode_config.mutex);
  64         drm_framebuffer_unreference(val);
  65         mutex_unlock(&dev->mode_config.mutex);
  66 }
  67
  68 static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb)
  69 {
  70         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
  71         struct drm_device *dev = crtc->dev;
  72         struct drm_gem_cma_object *gem;
  73         unsigned int depth, bpp;
  74         dma_addr_t start, end;
  75         u64 dma_base_and_ceiling;
  76
  77         drm_fb_get_bpp_depth(fb->pixel_format, &depth, &bpp);
  78         gem = drm_fb_cma_get_gem_obj(fb, 0);
  79
  80         start = gem->paddr + fb->offsets[0] +
  81                 crtc->y * fb->pitches[0] +
  82                 crtc->x * bpp / 8;
  83
  84         end = start + (crtc->mode.vdisplay * fb->pitches[0]);
  85
  86         /* Write LCDC_DMA_FB_BASE_ADDR_0_REG and LCDC_DMA_FB_CEILING_ADDR_0_REG
  87          * with a single insruction, if available. This should make it more
  88          * unlikely that LCDC would fetch the DMA addresses in the middle of
  89          * an update.
  90          */
  91         dma_base_and_ceiling = (u64)(end - 1) << 32 | start;
  92         tilcdc_write64(dev, LCDC_DMA_FB_BASE_ADDR_0_REG, dma_base_and_ceiling);
  93
  94         if (tilcdc_crtc->curr_fb)
  95                 drm_flip_work_queue(&tilcdc_crtc->unref_work,
  96                         tilcdc_crtc->curr_fb);
  97
  98         tilcdc_crtc->curr_fb = fb;
  99 }
 100
 101 static void tilcdc_crtc_enable_irqs(struct drm_device *dev)
 102 {
 103         struct tilcdc_drm_private *priv = dev->dev_private;
 104
 105         tilcdc_clear_irqstatus(dev, 0xffffffff);
 106
 107         if (priv->rev == 1) {
 108                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG,
 109                         LCDC_V1_UNDERFLOW_INT_ENA);
 110                 tilcdc_set(dev, LCDC_DMA_CTRL_REG,
 111                         LCDC_V1_END_OF_FRAME_INT_ENA);
 112         } else {
 113                 tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG,
 114                         LCDC_V2_UNDERFLOW_INT_ENA |
 115                         LCDC_V2_END_OF_FRAME0_INT_ENA |
 116                         LCDC_FRAME_DONE | LCDC_SYNC_LOST);
 117         }
 118 }
 119
 120 static void tilcdc_crtc_disable_irqs(struct drm_device *dev)
 121 {
 122         struct tilcdc_drm_private *priv = dev->dev_private;
 123
 124         /* disable irqs that we might have enabled: */
 125         if (priv->rev == 1) {
 126                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 127                         LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
 128                 tilcdc_clear(dev, LCDC_DMA_CTRL_REG,
 129                         LCDC_V1_END_OF_FRAME_INT_ENA);
 130         } else {
 131                 tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 132                         LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
 133                         LCDC_V2_END_OF_FRAME0_INT_ENA |
 134                         LCDC_FRAME_DONE | LCDC_SYNC_LOST);
 135         }
 136 }
 137
 138 static void reset(struct drm_crtc *crtc)
 139 {
 140         struct drm_device *dev = crtc->dev;
 141         struct tilcdc_drm_private *priv = dev->dev_private;
 142
 143         if (priv->rev != 2)
 144                 return;
 145
 146         tilcdc_set(dev, LCDC_CLK_RESET_REG, LCDC_CLK_MAIN_RESET);
 147         usleep_range(250, 1000);
 148         tilcdc_clear(dev, LCDC_CLK_RESET_REG, LCDC_CLK_MAIN_RESET);
 149 }
 150
 151 static void tilcdc_crtc_enable(struct drm_crtc *crtc)
 152 {
 153         struct drm_device *dev = crtc->dev;
 154         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 155
 156         WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 157
 158         if (tilcdc_crtc->enabled)
 159                 return;
 160
 161         pm_runtime_get_sync(dev->dev);
 162
 163         reset(crtc);
 164
 165         tilcdc_crtc_enable_irqs(dev);
 166
 167         tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_DUAL_FRAME_BUFFER_ENABLE);
 168         tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_PALETTE_LOAD_MODE(DATA_ONLY));
 169         tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 170
 171         drm_crtc_vblank_on(crtc);
 172
 173         tilcdc_crtc->enabled = true;
 174 }
 175
 176 void tilcdc_crtc_disable(struct drm_crtc *crtc)
 177 {
 178         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 179         struct drm_device *dev = crtc->dev;
 180         struct tilcdc_drm_private *priv = dev->dev_private;
 181
 182         WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 183
 184         if (!tilcdc_crtc->enabled)
 185                 return;
 186
 187         tilcdc_crtc->frame_done = false;
 188         tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 189
 190         /*
 191          * if necessary wait for framedone irq which will still come
 192          * before putting things to sleep..
 193          */
 194         if (priv->rev == 2) {
 195                 int ret = wait_event_timeout(tilcdc_crtc->frame_done_wq,
 196                                              tilcdc_crtc->frame_done,
 197                                              msecs_to_jiffies(500));
 198                 if (ret == 0)
 199                         dev_err(dev->dev, "%s: timeout waiting for framedone\n",
 200                                 __func__);
 201         }
 202
 203         drm_crtc_vblank_off(crtc);
 204
 205         tilcdc_crtc_disable_irqs(dev);
 206
 207         pm_runtime_put_sync(dev->dev);
 208
 209         if (tilcdc_crtc->next_fb) {
 210                 drm_flip_work_queue(&tilcdc_crtc->unref_work,
 211                                     tilcdc_crtc->next_fb);
 212                 tilcdc_crtc->next_fb = NULL;
 213         }
 214
 215         if (tilcdc_crtc->curr_fb) {
 216                 drm_flip_work_queue(&tilcdc_crtc->unref_work,
 217                                     tilcdc_crtc->curr_fb);
 218                 tilcdc_crtc->curr_fb = NULL;
 219         }
 220
 221         drm_flip_work_commit(&tilcdc_crtc->unref_work, priv->wq);
 222         tilcdc_crtc->last_vblank = ktime_set(0, 0);
 223
 224         tilcdc_crtc->enabled = false;
 225 }
 226
 227 static bool tilcdc_crtc_is_on(struct drm_crtc *crtc)
 228 {
 229         return crtc->state && crtc->state->enable && crtc->state->active;
 230 }
 231
 232 static void tilcdc_crtc_destroy(struct drm_crtc *crtc)
 233 {
 234         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 235         struct tilcdc_drm_private *priv = crtc->dev->dev_private;
 236
 237         drm_modeset_lock_crtc(crtc, NULL);
 238         tilcdc_crtc_disable(crtc);
 239         drm_modeset_unlock_crtc(crtc);
 240
 241         flush_workqueue(priv->wq);
 242
 243         of_node_put(crtc->port);
 244         drm_crtc_cleanup(crtc);
 245         drm_flip_work_cleanup(&tilcdc_crtc->unref_work);
 246 }
 247
 248 int tilcdc_crtc_update_fb(struct drm_crtc *crtc,
 249                 struct drm_framebuffer *fb,
 250                 struct drm_pending_vblank_event *event)
 251 {
 252         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 253         struct drm_device *dev = crtc->dev;
 254         unsigned long flags;
 255
 256         WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 257
 258         if (tilcdc_crtc->event) {
 259                 dev_err(dev->dev, "already pending page flip!\n");
 260                 return -EBUSY;
 261         }
 262
 263         drm_framebuffer_reference(fb);
 264
 265         crtc->primary->fb = fb;
 266
 267         spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);
 268
 269         if (crtc->hwmode.vrefresh && ktime_to_ns(tilcdc_crtc->last_vblank)) {
 270                 ktime_t next_vblank;
 271                 s64 tdiff;
 272
 273                 next_vblank = ktime_add_us(tilcdc_crtc->last_vblank,
 274                         1000000 / crtc->hwmode.vrefresh);
 275
 276                 tdiff = ktime_to_us(ktime_sub(next_vblank, ktime_get()));
 277
 278                 if (tdiff < TILCDC_VBLANK_SAFETY_THRESHOLD_US)
 279                         tilcdc_crtc->next_fb = fb;
 280         }
 281
 282         if (tilcdc_crtc->next_fb != fb)
 283                 set_scanout(crtc, fb);
 284
 285         tilcdc_crtc->event = event;
 286
 287         spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);
 288
 289         return 0;
 290 }
 291
 292 static bool tilcdc_crtc_mode_fixup(struct drm_crtc *crtc,
 293                 const struct drm_display_mode *mode,
 294                 struct drm_display_mode *adjusted_mode)
 295 {
 296         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 297
 298         if (!tilcdc_crtc->simulate_vesa_sync)
 299                 return true;
 300
 301         /*
 302          * tilcdc does not generate VESA-compliant sync but aligns
 303          * VS on the second edge of HS instead of first edge.
 304          * We use adjusted_mode, to fixup sync by aligning both rising
 305          * edges and add HSKEW offset to fix the sync.
 306          */
 307         adjusted_mode->hskew = mode->hsync_end - mode->hsync_start;
 308         adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW;
 309
 310         if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
 311                 adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 312                 adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC;
 313         } else {
 314                 adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 315                 adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC;
 316         }
 317
 318         return true;
 319 }
 320
 321 static void tilcdc_crtc_set_clk(struct drm_crtc *crtc)
 322 {
 323         struct drm_device *dev = crtc->dev;
 324         struct tilcdc_drm_private *priv = dev->dev_private;
 325         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 326         const unsigned clkdiv = 2; /* using a fixed divider of 2 */
 327         int ret;
 328
 329         /* mode.clock is in KHz, set_rate wants parameter in Hz */
 330         ret = clk_set_rate(priv->clk, crtc->mode.clock * 1000 * clkdiv);
 331         if (ret < 0) {
 332                 dev_err(dev->dev, "failed to set display clock rate to: %d\n",
 333                         crtc->mode.clock);
 334                 return;
 335         }
 336
 337         tilcdc_crtc->lcd_fck_rate = clk_get_rate(priv->clk);
 338
 339         DBG("lcd_clk=%u, mode clock=%d, div=%u",
 340             tilcdc_crtc->lcd_fck_rate, crtc->mode.clock, clkdiv);
 341
 342         /* Configure the LCD clock divisor. */
 343         tilcdc_write(dev, LCDC_CTRL_REG, LCDC_CLK_DIVISOR(clkdiv) |
 344                      LCDC_RASTER_MODE);
 345
 346         if (priv->rev == 2)
 347                 tilcdc_set(dev, LCDC_CLK_ENABLE_REG,
 348                                 LCDC_V2_DMA_CLK_EN | LCDC_V2_LIDD_CLK_EN |
 349                                 LCDC_V2_CORE_CLK_EN);
 350 }
 351
 352 static void tilcdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
 353 {
 354         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 355         struct drm_device *dev = crtc->dev;
 356         struct tilcdc_drm_private *priv = dev->dev_private;
 357         const struct tilcdc_panel_info *info = tilcdc_crtc->info;
 358         uint32_t reg, hbp, hfp, hsw, vbp, vfp, vsw;
 359         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 360         struct drm_framebuffer *fb = crtc->primary->state->fb;
 361
 362         WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 363
 364         if (WARN_ON(!info))
 365                 return;
 366
 367         if (WARN_ON(!fb))
 368                 return;
 369
 370         /* Configure the Burst Size and fifo threshold of DMA: */
 371         reg = tilcdc_read(dev, LCDC_DMA_CTRL_REG) & ~0x00000770;
 372         switch (info->dma_burst_sz) {
 373         case 1:
 374                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_1);
 375                 break;
 376         case 2:
 377                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_2);
 378                 break;
 379         case 4:
 380                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_4);
 381                 break;
 382         case 8:
 383                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_8);
 384                 break;
 385         case 16:
 386                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_16);
 387                 break;
 388         default:
 389                 dev_err(dev->dev, "invalid burst size\n");
 390                 return;
 391         }
 392         reg |= (info->fifo_th << 8);
 393         tilcdc_write(dev, LCDC_DMA_CTRL_REG, reg);
 394
 395         /* Configure timings: */
 396         hbp = mode->htotal - mode->hsync_end;
 397         hfp = mode->hsync_start - mode->hdisplay;
 398         hsw = mode->hsync_end - mode->hsync_start;
 399         vbp = mode->vtotal - mode->vsync_end;
 400         vfp = mode->vsync_start - mode->vdisplay;
 401         vsw = mode->vsync_end - mode->vsync_start;
 402
 403         DBG("%dx%d, hbp=%u, hfp=%u, hsw=%u, vbp=%u, vfp=%u, vsw=%u",
 404             mode->hdisplay, mode->vdisplay, hbp, hfp, hsw, vbp, vfp, vsw);
 405
 406         /* Set AC Bias Period and Number of Transitions per Interrupt: */
 407         reg = tilcdc_read(dev, LCDC_RASTER_TIMING_2_REG) & ~0x000fff00;
 408         reg |= LCDC_AC_BIAS_FREQUENCY(info->ac_bias) |
 409                 LCDC_AC_BIAS_TRANSITIONS_PER_INT(info->ac_bias_intrpt);
 410
 411         /*
 412          * subtract one from hfp, hbp, hsw because the hardware uses
 413          * a value of 0 as 1
 414          */
 415         if (priv->rev == 2) {
 416                 /* clear bits we're going to set */
 417                 reg &= ~0x78000033;
 418                 reg |= ((hfp-1) & 0x300) >> 8;
 419                 reg |= ((hbp-1) & 0x300) >> 4;
 420                 reg |= ((hsw-1) & 0x3c0) << 21;
 421         }
 422         tilcdc_write(dev, LCDC_RASTER_TIMING_2_REG, reg);
 423
 424         reg = (((mode->hdisplay >> 4) - 1) << 4) |
 425                 (((hbp-1) & 0xff) << 24) |
 426                 (((hfp-1) & 0xff) << 16) |
 427                 (((hsw-1) & 0x3f) << 10);
 428         if (priv->rev == 2)
 429                 reg |= (((mode->hdisplay >> 4) - 1) & 0x40) >> 3;
 430         tilcdc_write(dev, LCDC_RASTER_TIMING_0_REG, reg);
 431
 432         reg = ((mode->vdisplay - 1) & 0x3ff) |
 433                 ((vbp & 0xff) << 24) |
 434                 ((vfp & 0xff) << 16) |
 435                 (((vsw-1) & 0x3f) << 10);
 436         tilcdc_write(dev, LCDC_RASTER_TIMING_1_REG, reg);
 437
 438         /*
 439          * be sure to set Bit 10 for the V2 LCDC controller,
 440          * otherwise limited to 1024 pixels width, stopping
 441          * 1920x1080 being supported.
 442          */
 443         if (priv->rev == 2) {
 444                 if ((mode->vdisplay - 1) & 0x400) {
 445                         tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG,
 446                                 LCDC_LPP_B10);
 447                 } else {
 448                         tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG,
 449                                 LCDC_LPP_B10);
 450                 }
 451         }
 452
 453         /* Configure display type: */
 454         reg = tilcdc_read(dev, LCDC_RASTER_CTRL_REG) &
 455                 ~(LCDC_TFT_MODE | LCDC_MONO_8BIT_MODE | LCDC_MONOCHROME_MODE |
 456                   LCDC_V2_TFT_24BPP_MODE | LCDC_V2_TFT_24BPP_UNPACK |
 457                   0x000ff000 /* Palette Loading Delay bits */);
 458         reg |= LCDC_TFT_MODE; /* no monochrome/passive support */
 459         if (info->tft_alt_mode)
 460                 reg |= LCDC_TFT_ALT_ENABLE;
 461         if (priv->rev == 2) {
 462                 unsigned int depth, bpp;
 463
 464                 drm_fb_get_bpp_depth(fb->pixel_format, &depth, &bpp);
 465                 switch (bpp) {
 466                 case 16:
 467                         break;
 468                 case 32:
 469                         reg |= LCDC_V2_TFT_24BPP_UNPACK;
 470                         /* fallthrough */
 471                 case 24:
 472                         reg |= LCDC_V2_TFT_24BPP_MODE;
 473                         break;
 474                 default:
 475                         dev_err(dev->dev, "invalid pixel format\n");
 476                         return;
 477                 }
 478         }
 479         reg |= info->fdd < 12;
 480         tilcdc_write(dev, LCDC_RASTER_CTRL_REG, reg);
 481
 482         if (info->invert_pxl_clk)
 483                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK);
 484         else
 485                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK);
 486
 487         if (info->sync_ctrl)
 488                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL);
 489         else
 490                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL);
 491
 492         if (info->sync_edge)
 493                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE);
 494         else
 495                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE);
 496
 497         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 498                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_HSYNC);
 499         else
 500                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_HSYNC);
 501
 502         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 503                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_VSYNC);
 504         else
 505                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_VSYNC);
 506
 507         if (info->raster_order)
 508                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ORDER);
 509         else
 510                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ORDER);
 511
 512         drm_framebuffer_reference(fb);
 513
 514         set_scanout(crtc, fb);
 515
 516         tilcdc_crtc_set_clk(crtc);
 517
 518         crtc->hwmode = crtc->state->adjusted_mode;
 519 }
 520
 521 static int tilcdc_crtc_atomic_check(struct drm_crtc *crtc,
 522                                     struct drm_crtc_state *state)
 523 {
 524         struct drm_display_mode *mode = &state->mode;
 525         int ret;
 526
 527         /* If we are not active we don't care */
 528         if (!state->active)
 529                 return 0;
 530
 531         if (state->state->planes[0].ptr != crtc->primary ||
 532             state->state->planes[0].state == NULL ||
 533             state->state->planes[0].state->crtc != crtc) {
 534                 dev_dbg(crtc->dev->dev, "CRTC primary plane must be present");
 535                 return -EINVAL;
 536         }
 537
 538         ret = tilcdc_crtc_mode_valid(crtc, mode);
 539         if (ret) {
 540                 dev_dbg(crtc->dev->dev, "Mode \"%s\" not valid", mode->name);
 541                 return -EINVAL;
 542         }
 543
 544         return 0;
 545 }
 546
 547 static const struct drm_crtc_funcs tilcdc_crtc_funcs = {
 548         .destroy        = tilcdc_crtc_destroy,
 549         .set_config     = drm_atomic_helper_set_config,
 550         .page_flip      = drm_atomic_helper_page_flip,
 551         .reset          = drm_atomic_helper_crtc_reset,
 552         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 553         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 554 };
 555
 556 static const struct drm_crtc_helper_funcs tilcdc_crtc_helper_funcs = {
 557                 .mode_fixup     = tilcdc_crtc_mode_fixup,
 558                 .enable         = tilcdc_crtc_enable,
 559                 .disable        = tilcdc_crtc_disable,
 560                 .atomic_check   = tilcdc_crtc_atomic_check,
 561                 .mode_set_nofb  = tilcdc_crtc_mode_set_nofb,
 562 };
 563
 564 int tilcdc_crtc_max_width(struct drm_crtc *crtc)
 565 {
 566         struct drm_device *dev = crtc->dev;
 567         struct tilcdc_drm_private *priv = dev->dev_private;
 568         int max_width = 0;
 569
 570         if (priv->rev == 1)
 571                 max_width = 1024;
 572         else if (priv->rev == 2)
 573                 max_width = 2048;
 574
 575         return max_width;
 576 }
 577
 578 int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode)
 579 {
 580         struct tilcdc_drm_private *priv = crtc->dev->dev_private;
 581         unsigned int bandwidth;
 582         uint32_t hbp, hfp, hsw, vbp, vfp, vsw;
 583
 584         /*
 585          * check to see if the width is within the range that
 586          * the LCD Controller physically supports
 587          */
 588         if (mode->hdisplay > tilcdc_crtc_max_width(crtc))
 589                 return MODE_VIRTUAL_X;
 590
 591         /* width must be multiple of 16 */
 592         if (mode->hdisplay & 0xf)
 593                 return MODE_VIRTUAL_X;
 594
 595         if (mode->vdisplay > 2048)
 596                 return MODE_VIRTUAL_Y;
 597
 598         DBG("Processing mode %dx%d@%d with pixel clock %d",
 599                 mode->hdisplay, mode->vdisplay,
 600                 drm_mode_vrefresh(mode), mode->clock);
 601
 602         hbp = mode->htotal - mode->hsync_end;
 603         hfp = mode->hsync_start - mode->hdisplay;
 604         hsw = mode->hsync_end - mode->hsync_start;
 605         vbp = mode->vtotal - mode->vsync_end;
 606         vfp = mode->vsync_start - mode->vdisplay;
 607         vsw = mode->vsync_end - mode->vsync_start;
 608
 609         if ((hbp-1) & ~0x3ff) {
 610                 DBG("Pruning mode: Horizontal Back Porch out of range");
 611                 return MODE_HBLANK_WIDE;
 612         }
 613
 614         if ((hfp-1) & ~0x3ff) {
 615                 DBG("Pruning mode: Horizontal Front Porch out of range");
 616                 return MODE_HBLANK_WIDE;
 617         }
 618
 619         if ((hsw-1) & ~0x3ff) {
 620                 DBG("Pruning mode: Horizontal Sync Width out of range");
 621                 return MODE_HSYNC_WIDE;
 622         }
 623
 624         if (vbp & ~0xff) {
 625                 DBG("Pruning mode: Vertical Back Porch out of range");
 626                 return MODE_VBLANK_WIDE;
 627         }
 628
 629         if (vfp & ~0xff) {
 630                 DBG("Pruning mode: Vertical Front Porch out of range");
 631                 return MODE_VBLANK_WIDE;
 632         }
 633
 634         if ((vsw-1) & ~0x3f) {
 635                 DBG("Pruning mode: Vertical Sync Width out of range");
 636                 return MODE_VSYNC_WIDE;
 637         }
 638
 639         /*
 640          * some devices have a maximum allowed pixel clock
 641          * configured from the DT
 642          */
 643         if (mode->clock > priv->max_pixelclock) {
 644                 DBG("Pruning mode: pixel clock too high");
 645                 return MODE_CLOCK_HIGH;
 646         }
 647
 648         /*
 649          * some devices further limit the max horizontal resolution
 650          * configured from the DT
 651          */
 652         if (mode->hdisplay > priv->max_width)
 653                 return MODE_BAD_WIDTH;
 654
 655         /* filter out modes that would require too much memory bandwidth: */
 656         bandwidth = mode->hdisplay * mode->vdisplay *
 657                 drm_mode_vrefresh(mode);
 658         if (bandwidth > priv->max_bandwidth) {
 659                 DBG("Pruning mode: exceeds defined bandwidth limit");
 660                 return MODE_BAD;
 661         }
 662
 663         return MODE_OK;
 664 }
 665
 666 void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
 667                 const struct tilcdc_panel_info *info)
 668 {
 669         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 670         tilcdc_crtc->info = info;
 671 }
 672
 673 void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
 674                                         bool simulate_vesa_sync)
 675 {
 676         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 677
 678         tilcdc_crtc->simulate_vesa_sync = simulate_vesa_sync;
 679 }
 680
 681 void tilcdc_crtc_update_clk(struct drm_crtc *crtc)
 682 {
 683         struct drm_device *dev = crtc->dev;
 684         struct tilcdc_drm_private *priv = dev->dev_private;
 685         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 686
 687         drm_modeset_lock_crtc(crtc, NULL);
 688         if (tilcdc_crtc->lcd_fck_rate != clk_get_rate(priv->clk)) {
 689                 if (tilcdc_crtc_is_on(crtc)) {
 690                         pm_runtime_get_sync(dev->dev);
 691                         tilcdc_crtc_disable(crtc);
 692
 693                         tilcdc_crtc_set_clk(crtc);
 694
 695                         tilcdc_crtc_enable(crtc);
 696                         pm_runtime_put_sync(dev->dev);
 697                 }
 698         }
 699         drm_modeset_unlock_crtc(crtc);
 700 }
 701
 702 #define SYNC_LOST_COUNT_LIMIT 50
 703
 704 irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 705 {
 706         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 707         struct drm_device *dev = crtc->dev;
 708         struct tilcdc_drm_private *priv = dev->dev_private;
 709         uint32_t stat;
 710
 711         stat = tilcdc_read_irqstatus(dev);
 712         tilcdc_clear_irqstatus(dev, stat);
 713
 714         if (stat & LCDC_END_OF_FRAME0) {
 715                 unsigned long flags;
 716                 bool skip_event = false;
 717                 ktime_t now;
 718
 719                 now = ktime_get();
 720
 721                 drm_flip_work_commit(&tilcdc_crtc->unref_work, priv->wq);
 722
 723                 spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);
 724
 725                 tilcdc_crtc->last_vblank = now;
 726
 727                 if (tilcdc_crtc->next_fb) {
 728                         set_scanout(crtc, tilcdc_crtc->next_fb);
 729                         tilcdc_crtc->next_fb = NULL;
 730                         skip_event = true;
 731                 }
 732
 733                 spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);
 734
 735                 drm_crtc_handle_vblank(crtc);
 736
 737                 if (!skip_event) {
 738                         struct drm_pending_vblank_event *event;
 739
 740                         spin_lock_irqsave(&dev->event_lock, flags);
 741
 742                         event = tilcdc_crtc->event;
 743                         tilcdc_crtc->event = NULL;
 744                         if (event)
 745                                 drm_crtc_send_vblank_event(crtc, event);
 746
 747                         spin_unlock_irqrestore(&dev->event_lock, flags);
 748                 }
 749
 750                 if (tilcdc_crtc->frame_intact)
 751                         tilcdc_crtc->sync_lost_count = 0;
 752                 else
 753                         tilcdc_crtc->frame_intact = true;
 754         }
 755
 756         if (stat & LCDC_FIFO_UNDERFLOW)
 757                 dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underfow",
 758                                     __func__, stat);
 759
 760         /* For revision 2 only */
 761         if (priv->rev == 2) {
 762                 if (stat & LCDC_FRAME_DONE) {
 763                         tilcdc_crtc->frame_done = true;
 764                         wake_up(&tilcdc_crtc->frame_done_wq);
 765                 }
 766
 767                 if (stat & LCDC_SYNC_LOST) {
 768                         dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
 769                                             __func__, stat);
 770                         tilcdc_crtc->frame_intact = false;
 771                         if (tilcdc_crtc->sync_lost_count++ >
 772                             SYNC_LOST_COUNT_LIMIT) {
 773                                 dev_err(dev->dev, "%s(0x%08x): Sync lost flood detected, disabling the interrupt", __func__, stat);
 774                                 tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 775                                              LCDC_SYNC_LOST);
 776                         }
 777                 }
 778
 779                 /* Indicate to LCDC that the interrupt service routine has
 780                  * completed, see 13.3.6.1.6 in AM335x TRM.
 781                  */
 782                 tilcdc_write(dev, LCDC_END_OF_INT_IND_REG, 0);
 783         }
 784
 785         return IRQ_HANDLED;
 786 }
 787
 788 struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
 789 {
 790         struct tilcdc_drm_private *priv = dev->dev_private;
 791         struct tilcdc_crtc *tilcdc_crtc;
 792         struct drm_crtc *crtc;
 793         int ret;
 794
 795         tilcdc_crtc = devm_kzalloc(dev->dev, sizeof(*tilcdc_crtc), GFP_KERNEL);
 796         if (!tilcdc_crtc) {
 797                 dev_err(dev->dev, "allocation failed\n");
 798                 return NULL;
 799         }
 800
 801         crtc = &tilcdc_crtc->base;
 802
 803         ret = tilcdc_plane_init(dev, &tilcdc_crtc->primary);
 804         if (ret < 0)
 805                 goto fail;
 806
 807         init_waitqueue_head(&tilcdc_crtc->frame_done_wq);
 808
 809         drm_flip_work_init(&tilcdc_crtc->unref_work,
 810                         "unref", unref_worker);
 811
 812         spin_lock_init(&tilcdc_crtc->irq_lock);
 813
 814         ret = drm_crtc_init_with_planes(dev, crtc,
 815                                         &tilcdc_crtc->primary,
 816                                         NULL,
 817                                         &tilcdc_crtc_funcs,
 818                                         "tilcdc crtc");
 819         if (ret < 0)
 820                 goto fail;
 821
 822         drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs);
 823
 824         if (priv->is_componentized) {
 825                 struct device_node *ports =
 826                         of_get_child_by_name(dev->dev->of_node, "ports");
 827
 828                 if (ports) {
 829                         crtc->port = of_get_child_by_name(ports, "port");
 830                         of_node_put(ports);
 831                 } else {
 832                         crtc->port =
 833                                 of_get_child_by_name(dev->dev->of_node, "port");
 834                 }
 835                 if (!crtc->port) { /* This should never happen */
 836                         dev_err(dev->dev, "Port node not found in %s\n",
 837                                 dev->dev->of_node->full_name);
 838                         goto fail;
 839                 }
 840         }
 841
 842         return crtc;
 843
 844 fail:
 845         tilcdc_crtc_destroy(crtc);
 846         return NULL;
 847 }