drivers/gpu/drm/tilcdc/tilcdc_crtc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Texas Instruments
   4  * Author: Rob Clark <[email protected]>
   5  */
   6
   7 #include <linux/delay.h>
   8 #include <linux/dma-mapping.h>
   9 #include <linux/of_graph.h>
  10 #include <linux/pm_runtime.h>
  11
  12 #include <drm/drm_atomic.h>
  13 #include <drm/drm_atomic_helper.h>
  14 #include <drm/drm_crtc.h>
  15 #include <drm/drm_fb_cma_helper.h>
  16 #include <drm/drm_fourcc.h>
  17 #include <drm/drm_gem_cma_helper.h>
  18 #include <drm/drm_modeset_helper_vtables.h>
  19 #include <drm/drm_print.h>
  20 #include <drm/drm_vblank.h>
  21
  22 #include "tilcdc_drv.h"
  23 #include "tilcdc_regs.h"
  24
  25 #define TILCDC_VBLANK_SAFETY_THRESHOLD_US       1000
  26 #define TILCDC_PALETTE_SIZE                     32
  27 #define TILCDC_PALETTE_FIRST_ENTRY              0x4000
  28
  29 struct tilcdc_crtc {
  30         struct drm_crtc base;
  31
  32         struct drm_plane primary;
  33         const struct tilcdc_panel_info *info;
  34         struct drm_pending_vblank_event *event;
  35         struct mutex enable_lock;
  36         bool enabled;
  37         bool shutdown;
  38         wait_queue_head_t frame_done_wq;
  39         bool frame_done;
  40         spinlock_t irq_lock;
  41
  42         unsigned int lcd_fck_rate;
  43
  44         ktime_t last_vblank;
  45         unsigned int hvtotal_us;
  46
  47         struct drm_framebuffer *next_fb;
  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         struct work_struct recover_work;
  55
  56         dma_addr_t palette_dma_handle;
  57         u16 *palette_base;
  58         struct completion palette_loaded;
  59 };
  60 #define to_tilcdc_crtc(x) container_of(x, struct tilcdc_crtc, base)
  61
  62 static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb)
  63 {
  64         struct drm_device *dev = crtc->dev;
  65         struct tilcdc_drm_private *priv = dev->dev_private;
  66         struct drm_gem_cma_object *gem;
  67         dma_addr_t start, end;
  68         u64 dma_base_and_ceiling;
  69
  70         gem = drm_fb_cma_get_gem_obj(fb, 0);
  71
  72         start = gem->paddr + fb->offsets[0] +
  73                 crtc->y * fb->pitches[0] +
  74                 crtc->x * fb->format->cpp[0];
  75
  76         end = start + (crtc->mode.vdisplay * fb->pitches[0]);
  77
  78         /* Write LCDC_DMA_FB_BASE_ADDR_0_REG and LCDC_DMA_FB_CEILING_ADDR_0_REG
  79          * with a single insruction, if available. This should make it more
  80          * unlikely that LCDC would fetch the DMA addresses in the middle of
  81          * an update.
  82          */
  83         if (priv->rev == 1)
  84                 end -= 1;
  85
  86         dma_base_and_ceiling = (u64)end << 32 | start;
  87         tilcdc_write64(dev, LCDC_DMA_FB_BASE_ADDR_0_REG, dma_base_and_ceiling);
  88 }
  89
  90 /*
  91  * The driver currently only supports only true color formats. For
  92  * true color the palette block is bypassed, but a 32 byte palette
  93  * should still be loaded. The first 16-bit entry must be 0x4000 while
  94  * all other entries must be zeroed.
  95  */
  96 static void tilcdc_crtc_load_palette(struct drm_crtc *crtc)
  97 {
  98         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
  99         struct drm_device *dev = crtc->dev;
 100         struct tilcdc_drm_private *priv = dev->dev_private;
 101         int ret;
 102
 103         reinit_completion(&tilcdc_crtc->palette_loaded);
 104
 105         /* Tell the LCDC where the palette is located. */
 106         tilcdc_write(dev, LCDC_DMA_FB_BASE_ADDR_0_REG,
 107                      tilcdc_crtc->palette_dma_handle);
 108         tilcdc_write(dev, LCDC_DMA_FB_CEILING_ADDR_0_REG,
 109                      (u32) tilcdc_crtc->palette_dma_handle +
 110                      TILCDC_PALETTE_SIZE - 1);
 111
 112         /* Set dma load mode for palette loading only. */
 113         tilcdc_write_mask(dev, LCDC_RASTER_CTRL_REG,
 114                           LCDC_PALETTE_LOAD_MODE(PALETTE_ONLY),
 115                           LCDC_PALETTE_LOAD_MODE_MASK);
 116
 117         /* Enable DMA Palette Loaded Interrupt */
 118         if (priv->rev == 1)
 119                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_PL_INT_ENA);
 120         else
 121                 tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG, LCDC_V2_PL_INT_ENA);
 122
 123         /* Enable LCDC DMA and wait for palette to be loaded. */
 124         tilcdc_clear_irqstatus(dev, 0xffffffff);
 125         tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 126
 127         ret = wait_for_completion_timeout(&tilcdc_crtc->palette_loaded,
 128                                           msecs_to_jiffies(50));
 129         if (ret == 0)
 130                 dev_err(dev->dev, "%s: Palette loading timeout", __func__);
 131
 132         /* Disable LCDC DMA and DMA Palette Loaded Interrupt. */
 133         tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 134         if (priv->rev == 1)
 135                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_PL_INT_ENA);
 136         else
 137                 tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG, LCDC_V2_PL_INT_ENA);
 138 }
 139
 140 static void tilcdc_crtc_enable_irqs(struct drm_device *dev)
 141 {
 142         struct tilcdc_drm_private *priv = dev->dev_private;
 143
 144         tilcdc_clear_irqstatus(dev, 0xffffffff);
 145
 146         if (priv->rev == 1) {
 147                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG,
 148                         LCDC_V1_SYNC_LOST_INT_ENA | LCDC_V1_FRAME_DONE_INT_ENA |
 149                         LCDC_V1_UNDERFLOW_INT_ENA);
 150                 tilcdc_set(dev, LCDC_DMA_CTRL_REG,
 151                         LCDC_V1_END_OF_FRAME_INT_ENA);
 152         } else {
 153                 tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG,
 154                         LCDC_V2_UNDERFLOW_INT_ENA |
 155                         LCDC_V2_END_OF_FRAME0_INT_ENA |
 156                         LCDC_FRAME_DONE | LCDC_SYNC_LOST);
 157         }
 158 }
 159
 160 static void tilcdc_crtc_disable_irqs(struct drm_device *dev)
 161 {
 162         struct tilcdc_drm_private *priv = dev->dev_private;
 163
 164         /* disable irqs that we might have enabled: */
 165         if (priv->rev == 1) {
 166                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 167                         LCDC_V1_SYNC_LOST_INT_ENA | LCDC_V1_FRAME_DONE_INT_ENA |
 168                         LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
 169                 tilcdc_clear(dev, LCDC_DMA_CTRL_REG,
 170                         LCDC_V1_END_OF_FRAME_INT_ENA);
 171         } else {
 172                 tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 173                         LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
 174                         LCDC_V2_END_OF_FRAME0_INT_ENA |
 175                         LCDC_FRAME_DONE | LCDC_SYNC_LOST);
 176         }
 177 }
 178
 179 static void reset(struct drm_crtc *crtc)
 180 {
 181         struct drm_device *dev = crtc->dev;
 182         struct tilcdc_drm_private *priv = dev->dev_private;
 183
 184         if (priv->rev != 2)
 185                 return;
 186
 187         tilcdc_set(dev, LCDC_CLK_RESET_REG, LCDC_CLK_MAIN_RESET);
 188         usleep_range(250, 1000);
 189         tilcdc_clear(dev, LCDC_CLK_RESET_REG, LCDC_CLK_MAIN_RESET);
 190 }
 191
 192 /*
 193  * Calculate the percentage difference between the requested pixel clock rate
 194  * and the effective rate resulting from calculating the clock divider value.
 195  */
 196 static unsigned int tilcdc_pclk_diff(unsigned long rate,
 197                                      unsigned long real_rate)
 198 {
 199         int r = rate / 100, rr = real_rate / 100;
 200
 201         return (unsigned int)(abs(((rr - r) * 100) / r));
 202 }
 203
 204 static void tilcdc_crtc_set_clk(struct drm_crtc *crtc)
 205 {
 206         struct drm_device *dev = crtc->dev;
 207         struct tilcdc_drm_private *priv = dev->dev_private;
 208         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 209         unsigned long clk_rate, real_rate, req_rate;
 210         unsigned int clkdiv;
 211         int ret;
 212
 213         clkdiv = 2; /* first try using a standard divider of 2 */
 214
 215         /* mode.clock is in KHz, set_rate wants parameter in Hz */
 216         req_rate = crtc->mode.clock * 1000;
 217
 218         ret = clk_set_rate(priv->clk, req_rate * clkdiv);
 219         clk_rate = clk_get_rate(priv->clk);
 220         if (ret < 0 || tilcdc_pclk_diff(req_rate, clk_rate) > 5) {
 221                 /*
 222                  * If we fail to set the clock rate (some architectures don't
 223                  * use the common clock framework yet and may not implement
 224                  * all the clk API calls for every clock), try the next best
 225                  * thing: adjusting the clock divider, unless clk_get_rate()
 226                  * failed as well.
 227                  */
 228                 if (!clk_rate) {
 229                         /* Nothing more we can do. Just bail out. */
 230                         dev_err(dev->dev,
 231                                 "failed to set the pixel clock - unable to read current lcdc clock rate\n");
 232                         return;
 233                 }
 234
 235                 clkdiv = DIV_ROUND_CLOSEST(clk_rate, req_rate);
 236
 237                 /*
 238                  * Emit a warning if the real clock rate resulting from the
 239                  * calculated divider differs much from the requested rate.
 240                  *
 241                  * 5% is an arbitrary value - LCDs are usually quite tolerant
 242                  * about pixel clock rates.
 243                  */
 244                 real_rate = clkdiv * req_rate;
 245
 246                 if (tilcdc_pclk_diff(clk_rate, real_rate) > 5) {
 247                         dev_warn(dev->dev,
 248                                  "effective pixel clock rate (%luHz) differs from the calculated rate (%luHz)\n",
 249                                  clk_rate, real_rate);
 250                 }
 251         }
 252
 253         tilcdc_crtc->lcd_fck_rate = clk_rate;
 254
 255         DBG("lcd_clk=%u, mode clock=%d, div=%u",
 256             tilcdc_crtc->lcd_fck_rate, crtc->mode.clock, clkdiv);
 257
 258         /* Configure the LCD clock divisor. */
 259         tilcdc_write(dev, LCDC_CTRL_REG, LCDC_CLK_DIVISOR(clkdiv) |
 260                      LCDC_RASTER_MODE);
 261
 262         if (priv->rev == 2)
 263                 tilcdc_set(dev, LCDC_CLK_ENABLE_REG,
 264                                 LCDC_V2_DMA_CLK_EN | LCDC_V2_LIDD_CLK_EN |
 265                                 LCDC_V2_CORE_CLK_EN);
 266 }
 267
 268 static uint tilcdc_mode_hvtotal(const struct drm_display_mode *mode)
 269 {
 270         return (uint) div_u64(1000llu * mode->htotal * mode->vtotal,
 271                               mode->clock);
 272 }
 273
 274 static void tilcdc_crtc_set_mode(struct drm_crtc *crtc)
 275 {
 276         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 277         struct drm_device *dev = crtc->dev;
 278         struct tilcdc_drm_private *priv = dev->dev_private;
 279         const struct tilcdc_panel_info *info = tilcdc_crtc->info;
 280         uint32_t reg, hbp, hfp, hsw, vbp, vfp, vsw;
 281         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 282         struct drm_framebuffer *fb = crtc->primary->state->fb;
 283
 284         if (WARN_ON(!info))
 285                 return;
 286
 287         if (WARN_ON(!fb))
 288                 return;
 289
 290         /* Configure the Burst Size and fifo threshold of DMA: */
 291         reg = tilcdc_read(dev, LCDC_DMA_CTRL_REG) & ~0x00000770;
 292         switch (info->dma_burst_sz) {
 293         case 1:
 294                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_1);
 295                 break;
 296         case 2:
 297                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_2);
 298                 break;
 299         case 4:
 300                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_4);
 301                 break;
 302         case 8:
 303                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_8);
 304                 break;
 305         case 16:
 306                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_16);
 307                 break;
 308         default:
 309                 dev_err(dev->dev, "invalid burst size\n");
 310                 return;
 311         }
 312         reg |= (info->fifo_th << 8);
 313         tilcdc_write(dev, LCDC_DMA_CTRL_REG, reg);
 314
 315         /* Configure timings: */
 316         hbp = mode->htotal - mode->hsync_end;
 317         hfp = mode->hsync_start - mode->hdisplay;
 318         hsw = mode->hsync_end - mode->hsync_start;
 319         vbp = mode->vtotal - mode->vsync_end;
 320         vfp = mode->vsync_start - mode->vdisplay;
 321         vsw = mode->vsync_end - mode->vsync_start;
 322
 323         DBG("%dx%d, hbp=%u, hfp=%u, hsw=%u, vbp=%u, vfp=%u, vsw=%u",
 324             mode->hdisplay, mode->vdisplay, hbp, hfp, hsw, vbp, vfp, vsw);
 325
 326         /* Set AC Bias Period and Number of Transitions per Interrupt: */
 327         reg = tilcdc_read(dev, LCDC_RASTER_TIMING_2_REG) & ~0x000fff00;
 328         reg |= LCDC_AC_BIAS_FREQUENCY(info->ac_bias) |
 329                 LCDC_AC_BIAS_TRANSITIONS_PER_INT(info->ac_bias_intrpt);
 330
 331         /*
 332          * subtract one from hfp, hbp, hsw because the hardware uses
 333          * a value of 0 as 1
 334          */
 335         if (priv->rev == 2) {
 336                 /* clear bits we're going to set */
 337                 reg &= ~0x78000033;
 338                 reg |= ((hfp-1) & 0x300) >> 8;
 339                 reg |= ((hbp-1) & 0x300) >> 4;
 340                 reg |= ((hsw-1) & 0x3c0) << 21;
 341         }
 342         tilcdc_write(dev, LCDC_RASTER_TIMING_2_REG, reg);
 343
 344         reg = (((mode->hdisplay >> 4) - 1) << 4) |
 345                 (((hbp-1) & 0xff) << 24) |
 346                 (((hfp-1) & 0xff) << 16) |
 347                 (((hsw-1) & 0x3f) << 10);
 348         if (priv->rev == 2)
 349                 reg |= (((mode->hdisplay >> 4) - 1) & 0x40) >> 3;
 350         tilcdc_write(dev, LCDC_RASTER_TIMING_0_REG, reg);
 351
 352         reg = ((mode->vdisplay - 1) & 0x3ff) |
 353                 ((vbp & 0xff) << 24) |
 354                 ((vfp & 0xff) << 16) |
 355                 (((vsw-1) & 0x3f) << 10);
 356         tilcdc_write(dev, LCDC_RASTER_TIMING_1_REG, reg);
 357
 358         /*
 359          * be sure to set Bit 10 for the V2 LCDC controller,
 360          * otherwise limited to 1024 pixels width, stopping
 361          * 1920x1080 being supported.
 362          */
 363         if (priv->rev == 2) {
 364                 if ((mode->vdisplay - 1) & 0x400) {
 365                         tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG,
 366                                 LCDC_LPP_B10);
 367                 } else {
 368                         tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG,
 369                                 LCDC_LPP_B10);
 370                 }
 371         }
 372
 373         /* Configure display type: */
 374         reg = tilcdc_read(dev, LCDC_RASTER_CTRL_REG) &
 375                 ~(LCDC_TFT_MODE | LCDC_MONO_8BIT_MODE | LCDC_MONOCHROME_MODE |
 376                   LCDC_V2_TFT_24BPP_MODE | LCDC_V2_TFT_24BPP_UNPACK |
 377                   0x000ff000 /* Palette Loading Delay bits */);
 378         reg |= LCDC_TFT_MODE; /* no monochrome/passive support */
 379         if (info->tft_alt_mode)
 380                 reg |= LCDC_TFT_ALT_ENABLE;
 381         if (priv->rev == 2) {
 382                 switch (fb->format->format) {
 383                 case DRM_FORMAT_BGR565:
 384                 case DRM_FORMAT_RGB565:
 385                         break;
 386                 case DRM_FORMAT_XBGR8888:
 387                 case DRM_FORMAT_XRGB8888:
 388                         reg |= LCDC_V2_TFT_24BPP_UNPACK;
 389                         fallthrough;
 390                 case DRM_FORMAT_BGR888:
 391                 case DRM_FORMAT_RGB888:
 392                         reg |= LCDC_V2_TFT_24BPP_MODE;
 393                         break;
 394                 default:
 395                         dev_err(dev->dev, "invalid pixel format\n");
 396                         return;
 397                 }
 398         }
 399         reg |= info->fdd < 12;
 400         tilcdc_write(dev, LCDC_RASTER_CTRL_REG, reg);
 401
 402         if (info->invert_pxl_clk)
 403                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK);
 404         else
 405                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK);
 406
 407         if (info->sync_ctrl)
 408                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL);
 409         else
 410                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL);
 411
 412         if (info->sync_edge)
 413                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE);
 414         else
 415                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE);
 416
 417         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 418                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_HSYNC);
 419         else
 420                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_HSYNC);
 421
 422         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 423                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_VSYNC);
 424         else
 425                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_VSYNC);
 426
 427         if (info->raster_order)
 428                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ORDER);
 429         else
 430                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ORDER);
 431
 432         tilcdc_crtc_set_clk(crtc);
 433
 434         tilcdc_crtc_load_palette(crtc);
 435
 436         set_scanout(crtc, fb);
 437
 438         crtc->hwmode = crtc->state->adjusted_mode;
 439
 440         tilcdc_crtc->hvtotal_us =
 441                 tilcdc_mode_hvtotal(&crtc->hwmode);
 442 }
 443
 444 static void tilcdc_crtc_enable(struct drm_crtc *crtc)
 445 {
 446         struct drm_device *dev = crtc->dev;
 447         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 448         unsigned long flags;
 449
 450         mutex_lock(&tilcdc_crtc->enable_lock);
 451         if (tilcdc_crtc->enabled || tilcdc_crtc->shutdown) {
 452                 mutex_unlock(&tilcdc_crtc->enable_lock);
 453                 return;
 454         }
 455
 456         pm_runtime_get_sync(dev->dev);
 457
 458         reset(crtc);
 459
 460         tilcdc_crtc_set_mode(crtc);
 461
 462         tilcdc_crtc_enable_irqs(dev);
 463
 464         tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_DUAL_FRAME_BUFFER_ENABLE);
 465         tilcdc_write_mask(dev, LCDC_RASTER_CTRL_REG,
 466                           LCDC_PALETTE_LOAD_MODE(DATA_ONLY),
 467                           LCDC_PALETTE_LOAD_MODE_MASK);
 468
 469         /* There is no real chance for a race here as the time stamp
 470          * is taken before the raster DMA is started. The spin-lock is
 471          * taken to have a memory barrier after taking the time-stamp
 472          * and to avoid a context switch between taking the stamp and
 473          * enabling the raster.
 474          */
 475         spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);
 476         tilcdc_crtc->last_vblank = ktime_get();
 477         tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 478         spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);
 479
 480         drm_crtc_vblank_on(crtc);
 481
 482         tilcdc_crtc->enabled = true;
 483         mutex_unlock(&tilcdc_crtc->enable_lock);
 484 }
 485
 486 static void tilcdc_crtc_atomic_enable(struct drm_crtc *crtc,
 487                                       struct drm_crtc_state *old_state)
 488 {
 489         tilcdc_crtc_enable(crtc);
 490 }
 491
 492 static void tilcdc_crtc_off(struct drm_crtc *crtc, bool shutdown)
 493 {
 494         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 495         struct drm_device *dev = crtc->dev;
 496         int ret;
 497
 498         mutex_lock(&tilcdc_crtc->enable_lock);
 499         if (shutdown)
 500                 tilcdc_crtc->shutdown = true;
 501         if (!tilcdc_crtc->enabled) {
 502                 mutex_unlock(&tilcdc_crtc->enable_lock);
 503                 return;
 504         }
 505         tilcdc_crtc->frame_done = false;
 506         tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 507
 508         /*
 509          * Wait for framedone irq which will still come before putting
 510          * things to sleep..
 511          */
 512         ret = wait_event_timeout(tilcdc_crtc->frame_done_wq,
 513                                  tilcdc_crtc->frame_done,
 514                                  msecs_to_jiffies(500));
 515         if (ret == 0)
 516                 dev_err(dev->dev, "%s: timeout waiting for framedone\n",
 517                         __func__);
 518
 519         drm_crtc_vblank_off(crtc);
 520
 521         tilcdc_crtc_disable_irqs(dev);
 522
 523         pm_runtime_put_sync(dev->dev);
 524
 525         tilcdc_crtc->enabled = false;
 526         mutex_unlock(&tilcdc_crtc->enable_lock);
 527 }
 528
 529 static void tilcdc_crtc_disable(struct drm_crtc *crtc)
 530 {
 531         tilcdc_crtc_off(crtc, false);
 532 }
 533
 534 static void tilcdc_crtc_atomic_disable(struct drm_crtc *crtc,
 535                                        struct drm_crtc_state *old_state)
 536 {
 537         tilcdc_crtc_disable(crtc);
 538 }
 539
 540 static void tilcdc_crtc_atomic_flush(struct drm_crtc *crtc,
 541                                      struct drm_crtc_state *old_state)
 542 {
 543         if (!crtc->state->event)
 544                 return;
 545
 546         spin_lock_irq(&crtc->dev->event_lock);
 547         drm_crtc_send_vblank_event(crtc, crtc->state->event);
 548         crtc->state->event = NULL;
 549         spin_unlock_irq(&crtc->dev->event_lock);
 550 }
 551
 552 void tilcdc_crtc_shutdown(struct drm_crtc *crtc)
 553 {
 554         tilcdc_crtc_off(crtc, true);
 555 }
 556
 557 static bool tilcdc_crtc_is_on(struct drm_crtc *crtc)
 558 {
 559         return crtc->state && crtc->state->enable && crtc->state->active;
 560 }
 561
 562 static void tilcdc_crtc_recover_work(struct work_struct *work)
 563 {
 564         struct tilcdc_crtc *tilcdc_crtc =
 565                 container_of(work, struct tilcdc_crtc, recover_work);
 566         struct drm_crtc *crtc = &tilcdc_crtc->base;
 567
 568         dev_info(crtc->dev->dev, "%s: Reset CRTC", __func__);
 569
 570         drm_modeset_lock(&crtc->mutex, NULL);
 571
 572         if (!tilcdc_crtc_is_on(crtc))
 573                 goto out;
 574
 575         tilcdc_crtc_disable(crtc);
 576         tilcdc_crtc_enable(crtc);
 577 out:
 578         drm_modeset_unlock(&crtc->mutex);
 579 }
 580
 581 static void tilcdc_crtc_destroy(struct drm_crtc *crtc)
 582 {
 583         struct tilcdc_drm_private *priv = crtc->dev->dev_private;
 584
 585         tilcdc_crtc_shutdown(crtc);
 586
 587         flush_workqueue(priv->wq);
 588
 589         of_node_put(crtc->port);
 590         drm_crtc_cleanup(crtc);
 591 }
 592
 593 int tilcdc_crtc_update_fb(struct drm_crtc *crtc,
 594                 struct drm_framebuffer *fb,
 595                 struct drm_pending_vblank_event *event)
 596 {
 597         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 598         struct drm_device *dev = crtc->dev;
 599
 600         if (tilcdc_crtc->event) {
 601                 dev_err(dev->dev, "already pending page flip!\n");
 602                 return -EBUSY;
 603         }
 604
 605         tilcdc_crtc->event = event;
 606
 607         mutex_lock(&tilcdc_crtc->enable_lock);
 608
 609         if (tilcdc_crtc->enabled) {
 610                 unsigned long flags;
 611                 ktime_t next_vblank;
 612                 s64 tdiff;
 613
 614                 spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);
 615
 616                 next_vblank = ktime_add_us(tilcdc_crtc->last_vblank,
 617                                            tilcdc_crtc->hvtotal_us);
 618                 tdiff = ktime_to_us(ktime_sub(next_vblank, ktime_get()));
 619
 620                 if (tdiff < TILCDC_VBLANK_SAFETY_THRESHOLD_US)
 621                         tilcdc_crtc->next_fb = fb;
 622                 else
 623                         set_scanout(crtc, fb);
 624
 625                 spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);
 626         }
 627
 628         mutex_unlock(&tilcdc_crtc->enable_lock);
 629
 630         return 0;
 631 }
 632
 633 static bool tilcdc_crtc_mode_fixup(struct drm_crtc *crtc,
 634                 const struct drm_display_mode *mode,
 635                 struct drm_display_mode *adjusted_mode)
 636 {
 637         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 638
 639         if (!tilcdc_crtc->simulate_vesa_sync)
 640                 return true;
 641
 642         /*
 643          * tilcdc does not generate VESA-compliant sync but aligns
 644          * VS on the second edge of HS instead of first edge.
 645          * We use adjusted_mode, to fixup sync by aligning both rising
 646          * edges and add HSKEW offset to fix the sync.
 647          */
 648         adjusted_mode->hskew = mode->hsync_end - mode->hsync_start;
 649         adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW;
 650
 651         if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
 652                 adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 653                 adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC;
 654         } else {
 655                 adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 656                 adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC;
 657         }
 658
 659         return true;
 660 }
 661
 662 static int tilcdc_crtc_atomic_check(struct drm_crtc *crtc,
 663                                     struct drm_crtc_state *state)
 664 {
 665         /* If we are not active we don't care */
 666         if (!state->active)
 667                 return 0;
 668
 669         if (state->state->planes[0].ptr != crtc->primary ||
 670             state->state->planes[0].state == NULL ||
 671             state->state->planes[0].state->crtc != crtc) {
 672                 dev_dbg(crtc->dev->dev, "CRTC primary plane must be present");
 673                 return -EINVAL;
 674         }
 675
 676         return 0;
 677 }
 678
 679 static int tilcdc_crtc_enable_vblank(struct drm_crtc *crtc)
 680 {
 681         return 0;
 682 }
 683
 684 static void tilcdc_crtc_disable_vblank(struct drm_crtc *crtc)
 685 {
 686 }
 687
 688 static void tilcdc_crtc_reset(struct drm_crtc *crtc)
 689 {
 690         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 691         struct drm_device *dev = crtc->dev;
 692         int ret;
 693
 694         drm_atomic_helper_crtc_reset(crtc);
 695
 696         /* Turn the raster off if it for some reason is on. */
 697         pm_runtime_get_sync(dev->dev);
 698         if (tilcdc_read(dev, LCDC_RASTER_CTRL_REG) & LCDC_RASTER_ENABLE) {
 699                 /* Enable DMA Frame Done Interrupt */
 700                 tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG, LCDC_FRAME_DONE);
 701                 tilcdc_clear_irqstatus(dev, 0xffffffff);
 702
 703                 tilcdc_crtc->frame_done = false;
 704                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 705
 706                 ret = wait_event_timeout(tilcdc_crtc->frame_done_wq,
 707                                          tilcdc_crtc->frame_done,
 708                                          msecs_to_jiffies(500));
 709                 if (ret == 0)
 710                         dev_err(dev->dev, "%s: timeout waiting for framedone\n",
 711                                 __func__);
 712         }
 713         pm_runtime_put_sync(dev->dev);
 714 }
 715
 716 static const struct drm_crtc_funcs tilcdc_crtc_funcs = {
 717         .destroy        = tilcdc_crtc_destroy,
 718         .set_config     = drm_atomic_helper_set_config,
 719         .page_flip      = drm_atomic_helper_page_flip,
 720         .reset          = tilcdc_crtc_reset,
 721         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 722         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 723         .enable_vblank  = tilcdc_crtc_enable_vblank,
 724         .disable_vblank = tilcdc_crtc_disable_vblank,
 725 };
 726
 727 int tilcdc_crtc_max_width(struct drm_crtc *crtc)
 728 {
 729         struct drm_device *dev = crtc->dev;
 730         struct tilcdc_drm_private *priv = dev->dev_private;
 731         int max_width = 0;
 732
 733         if (priv->rev == 1)
 734                 max_width = 1024;
 735         else if (priv->rev == 2)
 736                 max_width = 2048;
 737
 738         return max_width;
 739 }
 740
 741 static enum drm_mode_status
 742 tilcdc_crtc_mode_valid(struct drm_crtc *crtc,
 743                        const struct drm_display_mode *mode)
 744 {
 745         struct tilcdc_drm_private *priv = crtc->dev->dev_private;
 746         unsigned int bandwidth;
 747         uint32_t hbp, hfp, hsw, vbp, vfp, vsw;
 748
 749         /*
 750          * check to see if the width is within the range that
 751          * the LCD Controller physically supports
 752          */
 753         if (mode->hdisplay > tilcdc_crtc_max_width(crtc))
 754                 return MODE_VIRTUAL_X;
 755
 756         /* width must be multiple of 16 */
 757         if (mode->hdisplay & 0xf)
 758                 return MODE_VIRTUAL_X;
 759
 760         if (mode->vdisplay > 2048)
 761                 return MODE_VIRTUAL_Y;
 762
 763         DBG("Processing mode %dx%d@%d with pixel clock %d",
 764                 mode->hdisplay, mode->vdisplay,
 765                 drm_mode_vrefresh(mode), mode->clock);
 766
 767         hbp = mode->htotal - mode->hsync_end;
 768         hfp = mode->hsync_start - mode->hdisplay;
 769         hsw = mode->hsync_end - mode->hsync_start;
 770         vbp = mode->vtotal - mode->vsync_end;
 771         vfp = mode->vsync_start - mode->vdisplay;
 772         vsw = mode->vsync_end - mode->vsync_start;
 773
 774         if ((hbp-1) & ~0x3ff) {
 775                 DBG("Pruning mode: Horizontal Back Porch out of range");
 776                 return MODE_HBLANK_WIDE;
 777         }
 778
 779         if ((hfp-1) & ~0x3ff) {
 780                 DBG("Pruning mode: Horizontal Front Porch out of range");
 781                 return MODE_HBLANK_WIDE;
 782         }
 783
 784         if ((hsw-1) & ~0x3ff) {
 785                 DBG("Pruning mode: Horizontal Sync Width out of range");
 786                 return MODE_HSYNC_WIDE;
 787         }
 788
 789         if (vbp & ~0xff) {
 790                 DBG("Pruning mode: Vertical Back Porch out of range");
 791                 return MODE_VBLANK_WIDE;
 792         }
 793
 794         if (vfp & ~0xff) {
 795                 DBG("Pruning mode: Vertical Front Porch out of range");
 796                 return MODE_VBLANK_WIDE;
 797         }
 798
 799         if ((vsw-1) & ~0x3f) {
 800                 DBG("Pruning mode: Vertical Sync Width out of range");
 801                 return MODE_VSYNC_WIDE;
 802         }
 803
 804         /*
 805          * some devices have a maximum allowed pixel clock
 806          * configured from the DT
 807          */
 808         if (mode->clock > priv->max_pixelclock) {
 809                 DBG("Pruning mode: pixel clock too high");
 810                 return MODE_CLOCK_HIGH;
 811         }
 812
 813         /*
 814          * some devices further limit the max horizontal resolution
 815          * configured from the DT
 816          */
 817         if (mode->hdisplay > priv->max_width)
 818                 return MODE_BAD_WIDTH;
 819
 820         /* filter out modes that would require too much memory bandwidth: */
 821         bandwidth = mode->hdisplay * mode->vdisplay *
 822                 drm_mode_vrefresh(mode);
 823         if (bandwidth > priv->max_bandwidth) {
 824                 DBG("Pruning mode: exceeds defined bandwidth limit");
 825                 return MODE_BAD;
 826         }
 827
 828         return MODE_OK;
 829 }
 830
 831 static const struct drm_crtc_helper_funcs tilcdc_crtc_helper_funcs = {
 832         .mode_valid     = tilcdc_crtc_mode_valid,
 833         .mode_fixup     = tilcdc_crtc_mode_fixup,
 834         .atomic_check   = tilcdc_crtc_atomic_check,
 835         .atomic_enable  = tilcdc_crtc_atomic_enable,
 836         .atomic_disable = tilcdc_crtc_atomic_disable,
 837         .atomic_flush   = tilcdc_crtc_atomic_flush,
 838 };
 839
 840 void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
 841                 const struct tilcdc_panel_info *info)
 842 {
 843         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 844         tilcdc_crtc->info = info;
 845 }
 846
 847 void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
 848                                         bool simulate_vesa_sync)
 849 {
 850         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 851
 852         tilcdc_crtc->simulate_vesa_sync = simulate_vesa_sync;
 853 }
 854
 855 void tilcdc_crtc_update_clk(struct drm_crtc *crtc)
 856 {
 857         struct drm_device *dev = crtc->dev;
 858         struct tilcdc_drm_private *priv = dev->dev_private;
 859         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 860
 861         drm_modeset_lock(&crtc->mutex, NULL);
 862         if (tilcdc_crtc->lcd_fck_rate != clk_get_rate(priv->clk)) {
 863                 if (tilcdc_crtc_is_on(crtc)) {
 864                         pm_runtime_get_sync(dev->dev);
 865                         tilcdc_crtc_disable(crtc);
 866
 867                         tilcdc_crtc_set_clk(crtc);
 868
 869                         tilcdc_crtc_enable(crtc);
 870                         pm_runtime_put_sync(dev->dev);
 871                 }
 872         }
 873         drm_modeset_unlock(&crtc->mutex);
 874 }
 875
 876 #define SYNC_LOST_COUNT_LIMIT 50
 877
 878 irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 879 {
 880         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 881         struct drm_device *dev = crtc->dev;
 882         struct tilcdc_drm_private *priv = dev->dev_private;
 883         uint32_t stat, reg;
 884
 885         stat = tilcdc_read_irqstatus(dev);
 886         tilcdc_clear_irqstatus(dev, stat);
 887
 888         if (stat & LCDC_END_OF_FRAME0) {
 889                 unsigned long flags;
 890                 bool skip_event = false;
 891                 ktime_t now;
 892
 893                 now = ktime_get();
 894
 895                 spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);
 896
 897                 tilcdc_crtc->last_vblank = now;
 898
 899                 if (tilcdc_crtc->next_fb) {
 900                         set_scanout(crtc, tilcdc_crtc->next_fb);
 901                         tilcdc_crtc->next_fb = NULL;
 902                         skip_event = true;
 903                 }
 904
 905                 spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);
 906
 907                 drm_crtc_handle_vblank(crtc);
 908
 909                 if (!skip_event) {
 910                         struct drm_pending_vblank_event *event;
 911
 912                         spin_lock_irqsave(&dev->event_lock, flags);
 913
 914                         event = tilcdc_crtc->event;
 915                         tilcdc_crtc->event = NULL;
 916                         if (event)
 917                                 drm_crtc_send_vblank_event(crtc, event);
 918
 919                         spin_unlock_irqrestore(&dev->event_lock, flags);
 920                 }
 921
 922                 if (tilcdc_crtc->frame_intact)
 923                         tilcdc_crtc->sync_lost_count = 0;
 924                 else
 925                         tilcdc_crtc->frame_intact = true;
 926         }
 927
 928         if (stat & LCDC_FIFO_UNDERFLOW)
 929                 dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underflow",
 930                                     __func__, stat);
 931
 932         if (stat & LCDC_PL_LOAD_DONE) {
 933                 complete(&tilcdc_crtc->palette_loaded);
 934                 if (priv->rev == 1)
 935                         tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 936                                      LCDC_V1_PL_INT_ENA);
 937                 else
 938                         tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 939                                      LCDC_V2_PL_INT_ENA);
 940         }
 941
 942         if (stat & LCDC_SYNC_LOST) {
 943                 dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
 944                                     __func__, stat);
 945                 tilcdc_crtc->frame_intact = false;
 946                 if (priv->rev == 1) {
 947                         reg = tilcdc_read(dev, LCDC_RASTER_CTRL_REG);
 948                         if (reg & LCDC_RASTER_ENABLE) {
 949                                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 950                                              LCDC_RASTER_ENABLE);
 951                                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG,
 952                                            LCDC_RASTER_ENABLE);
 953                         }
 954                 } else {
 955                         if (tilcdc_crtc->sync_lost_count++ >
 956                             SYNC_LOST_COUNT_LIMIT) {
 957                                 dev_err(dev->dev,
 958                                         "%s(0x%08x): Sync lost flood detected, recovering",
 959                                         __func__, stat);
 960                                 queue_work(system_wq,
 961                                            &tilcdc_crtc->recover_work);
 962                                 tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 963                                              LCDC_SYNC_LOST);
 964                                 tilcdc_crtc->sync_lost_count = 0;
 965                         }
 966                 }
 967         }
 968
 969         if (stat & LCDC_FRAME_DONE) {
 970                 tilcdc_crtc->frame_done = true;
 971                 wake_up(&tilcdc_crtc->frame_done_wq);
 972                 /* rev 1 lcdc appears to hang if irq is not disbaled here */
 973                 if (priv->rev == 1)
 974                         tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 975                                      LCDC_V1_FRAME_DONE_INT_ENA);
 976         }
 977
 978         /* For revision 2 only */
 979         if (priv->rev == 2) {
 980                 /* Indicate to LCDC that the interrupt service routine has
 981                  * completed, see 13.3.6.1.6 in AM335x TRM.
 982                  */
 983                 tilcdc_write(dev, LCDC_END_OF_INT_IND_REG, 0);
 984         }
 985
 986         return IRQ_HANDLED;
 987 }
 988
 989 int tilcdc_crtc_create(struct drm_device *dev)
 990 {
 991         struct tilcdc_drm_private *priv = dev->dev_private;
 992         struct tilcdc_crtc *tilcdc_crtc;
 993         struct drm_crtc *crtc;
 994         int ret;
 995
 996         tilcdc_crtc = devm_kzalloc(dev->dev, sizeof(*tilcdc_crtc), GFP_KERNEL);
 997         if (!tilcdc_crtc)
 998                 return -ENOMEM;
 999
1000         init_completion(&tilcdc_crtc->palette_loaded);
1001         tilcdc_crtc->palette_base = dmam_alloc_coherent(dev->dev,
1002                                         TILCDC_PALETTE_SIZE,
1003                                         &tilcdc_crtc->palette_dma_handle,
1004                                         GFP_KERNEL | __GFP_ZERO);
1005         if (!tilcdc_crtc->palette_base)
1006                 return -ENOMEM;
1007         *tilcdc_crtc->palette_base = TILCDC_PALETTE_FIRST_ENTRY;
1008
1009         crtc = &tilcdc_crtc->base;
1010
1011         ret = tilcdc_plane_init(dev, &tilcdc_crtc->primary);
1012         if (ret < 0)
1013                 goto fail;
1014
1015         mutex_init(&tilcdc_crtc->enable_lock);
1016
1017         init_waitqueue_head(&tilcdc_crtc->frame_done_wq);
1018
1019         spin_lock_init(&tilcdc_crtc->irq_lock);
1020         INIT_WORK(&tilcdc_crtc->recover_work, tilcdc_crtc_recover_work);
1021
1022         ret = drm_crtc_init_with_planes(dev, crtc,
1023                                         &tilcdc_crtc->primary,
1024                                         NULL,
1025                                         &tilcdc_crtc_funcs,
1026                                         "tilcdc crtc");
1027         if (ret < 0)
1028                 goto fail;
1029
1030         drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs);
1031
1032         if (priv->is_componentized) {
1033                 crtc->port = of_graph_get_port_by_id(dev->dev->of_node, 0);
1034                 if (!crtc->port) { /* This should never happen */
1035                         dev_err(dev->dev, "Port node not found in %pOF\n",
1036                                 dev->dev->of_node);
1037                         ret = -EINVAL;
1038                         goto fail;
1039                 }
1040         }
1041
1042         priv->crtc = crtc;
1043         return 0;
1044
1045 fail:
1046         tilcdc_crtc_destroy(crtc);
1047         return ret;
1048 }