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 <robdclark@gmail.com>
   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 void tilcdc_crtc_shutdown(struct drm_crtc *crtc)
 541 {
 542         tilcdc_crtc_off(crtc, true);
 543 }
 544
 545 static bool tilcdc_crtc_is_on(struct drm_crtc *crtc)
 546 {
 547         return crtc->state && crtc->state->enable && crtc->state->active;
 548 }
 549
 550 static void tilcdc_crtc_recover_work(struct work_struct *work)
 551 {
 552         struct tilcdc_crtc *tilcdc_crtc =
 553                 container_of(work, struct tilcdc_crtc, recover_work);
 554         struct drm_crtc *crtc = &tilcdc_crtc->base;
 555
 556         dev_info(crtc->dev->dev, "%s: Reset CRTC", __func__);
 557
 558         drm_modeset_lock(&crtc->mutex, NULL);
 559
 560         if (!tilcdc_crtc_is_on(crtc))
 561                 goto out;
 562
 563         tilcdc_crtc_disable(crtc);
 564         tilcdc_crtc_enable(crtc);
 565 out:
 566         drm_modeset_unlock(&crtc->mutex);
 567 }
 568
 569 static void tilcdc_crtc_destroy(struct drm_crtc *crtc)
 570 {
 571         struct tilcdc_drm_private *priv = crtc->dev->dev_private;
 572
 573         tilcdc_crtc_shutdown(crtc);
 574
 575         flush_workqueue(priv->wq);
 576
 577         of_node_put(crtc->port);
 578         drm_crtc_cleanup(crtc);
 579 }
 580
 581 int tilcdc_crtc_update_fb(struct drm_crtc *crtc,
 582                 struct drm_framebuffer *fb,
 583                 struct drm_pending_vblank_event *event)
 584 {
 585         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 586         struct drm_device *dev = crtc->dev;
 587
 588         if (tilcdc_crtc->event) {
 589                 dev_err(dev->dev, "already pending page flip!\n");
 590                 return -EBUSY;
 591         }
 592
 593         tilcdc_crtc->event = event;
 594
 595         mutex_lock(&tilcdc_crtc->enable_lock);
 596
 597         if (tilcdc_crtc->enabled) {
 598                 unsigned long flags;
 599                 ktime_t next_vblank;
 600                 s64 tdiff;
 601
 602                 spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);
 603
 604                 next_vblank = ktime_add_us(tilcdc_crtc->last_vblank,
 605                                            tilcdc_crtc->hvtotal_us);
 606                 tdiff = ktime_to_us(ktime_sub(next_vblank, ktime_get()));
 607
 608                 if (tdiff < TILCDC_VBLANK_SAFETY_THRESHOLD_US)
 609                         tilcdc_crtc->next_fb = fb;
 610                 else
 611                         set_scanout(crtc, fb);
 612
 613                 spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);
 614         }
 615
 616         mutex_unlock(&tilcdc_crtc->enable_lock);
 617
 618         return 0;
 619 }
 620
 621 static bool tilcdc_crtc_mode_fixup(struct drm_crtc *crtc,
 622                 const struct drm_display_mode *mode,
 623                 struct drm_display_mode *adjusted_mode)
 624 {
 625         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 626
 627         if (!tilcdc_crtc->simulate_vesa_sync)
 628                 return true;
 629
 630         /*
 631          * tilcdc does not generate VESA-compliant sync but aligns
 632          * VS on the second edge of HS instead of first edge.
 633          * We use adjusted_mode, to fixup sync by aligning both rising
 634          * edges and add HSKEW offset to fix the sync.
 635          */
 636         adjusted_mode->hskew = mode->hsync_end - mode->hsync_start;
 637         adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW;
 638
 639         if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
 640                 adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 641                 adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC;
 642         } else {
 643                 adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 644                 adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC;
 645         }
 646
 647         return true;
 648 }
 649
 650 static int tilcdc_crtc_atomic_check(struct drm_crtc *crtc,
 651                                     struct drm_crtc_state *state)
 652 {
 653         struct drm_display_mode *mode = &state->mode;
 654         int ret;
 655
 656         /* If we are not active we don't care */
 657         if (!state->active)
 658                 return 0;
 659
 660         if (state->state->planes[0].ptr != crtc->primary ||
 661             state->state->planes[0].state == NULL ||
 662             state->state->planes[0].state->crtc != crtc) {
 663                 dev_dbg(crtc->dev->dev, "CRTC primary plane must be present");
 664                 return -EINVAL;
 665         }
 666
 667         ret = tilcdc_crtc_mode_valid(crtc, mode);
 668         if (ret) {
 669                 dev_dbg(crtc->dev->dev, "Mode \"%s\" not valid", mode->name);
 670                 return -EINVAL;
 671         }
 672
 673         return 0;
 674 }
 675
 676 static int tilcdc_crtc_enable_vblank(struct drm_crtc *crtc)
 677 {
 678         return 0;
 679 }
 680
 681 static void tilcdc_crtc_disable_vblank(struct drm_crtc *crtc)
 682 {
 683 }
 684
 685 static void tilcdc_crtc_reset(struct drm_crtc *crtc)
 686 {
 687         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 688         struct drm_device *dev = crtc->dev;
 689         int ret;
 690
 691         drm_atomic_helper_crtc_reset(crtc);
 692
 693         /* Turn the raster off if it for some reason is on. */
 694         pm_runtime_get_sync(dev->dev);
 695         if (tilcdc_read(dev, LCDC_RASTER_CTRL_REG) & LCDC_RASTER_ENABLE) {
 696                 /* Enable DMA Frame Done Interrupt */
 697                 tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG, LCDC_FRAME_DONE);
 698                 tilcdc_clear_irqstatus(dev, 0xffffffff);
 699
 700                 tilcdc_crtc->frame_done = false;
 701                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 702
 703                 ret = wait_event_timeout(tilcdc_crtc->frame_done_wq,
 704                                          tilcdc_crtc->frame_done,
 705                                          msecs_to_jiffies(500));
 706                 if (ret == 0)
 707                         dev_err(dev->dev, "%s: timeout waiting for framedone\n",
 708                                 __func__);
 709         }
 710         pm_runtime_put_sync(dev->dev);
 711 }
 712
 713 static const struct drm_crtc_funcs tilcdc_crtc_funcs = {
 714         .destroy        = tilcdc_crtc_destroy,
 715         .set_config     = drm_atomic_helper_set_config,
 716         .page_flip      = drm_atomic_helper_page_flip,
 717         .reset          = tilcdc_crtc_reset,
 718         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 719         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 720         .enable_vblank  = tilcdc_crtc_enable_vblank,
 721         .disable_vblank = tilcdc_crtc_disable_vblank,
 722 };
 723
 724 static const struct drm_crtc_helper_funcs tilcdc_crtc_helper_funcs = {
 725                 .mode_fixup     = tilcdc_crtc_mode_fixup,
 726                 .atomic_check   = tilcdc_crtc_atomic_check,
 727                 .atomic_enable  = tilcdc_crtc_atomic_enable,
 728                 .atomic_disable = tilcdc_crtc_atomic_disable,
 729 };
 730
 731 int tilcdc_crtc_max_width(struct drm_crtc *crtc)
 732 {
 733         struct drm_device *dev = crtc->dev;
 734         struct tilcdc_drm_private *priv = dev->dev_private;
 735         int max_width = 0;
 736
 737         if (priv->rev == 1)
 738                 max_width = 1024;
 739         else if (priv->rev == 2)
 740                 max_width = 2048;
 741
 742         return max_width;
 743 }
 744
 745 int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode)
 746 {
 747         struct tilcdc_drm_private *priv = crtc->dev->dev_private;
 748         unsigned int bandwidth;
 749         uint32_t hbp, hfp, hsw, vbp, vfp, vsw;
 750
 751         /*
 752          * check to see if the width is within the range that
 753          * the LCD Controller physically supports
 754          */
 755         if (mode->hdisplay > tilcdc_crtc_max_width(crtc))
 756                 return MODE_VIRTUAL_X;
 757
 758         /* width must be multiple of 16 */
 759         if (mode->hdisplay & 0xf)
 760                 return MODE_VIRTUAL_X;
 761
 762         if (mode->vdisplay > 2048)
 763                 return MODE_VIRTUAL_Y;
 764
 765         DBG("Processing mode %dx%d@%d with pixel clock %d",
 766                 mode->hdisplay, mode->vdisplay,
 767                 drm_mode_vrefresh(mode), mode->clock);
 768
 769         hbp = mode->htotal - mode->hsync_end;
 770         hfp = mode->hsync_start - mode->hdisplay;
 771         hsw = mode->hsync_end - mode->hsync_start;
 772         vbp = mode->vtotal - mode->vsync_end;
 773         vfp = mode->vsync_start - mode->vdisplay;
 774         vsw = mode->vsync_end - mode->vsync_start;
 775
 776         if ((hbp-1) & ~0x3ff) {
 777                 DBG("Pruning mode: Horizontal Back Porch out of range");
 778                 return MODE_HBLANK_WIDE;
 779         }
 780
 781         if ((hfp-1) & ~0x3ff) {
 782                 DBG("Pruning mode: Horizontal Front Porch out of range");
 783                 return MODE_HBLANK_WIDE;
 784         }
 785
 786         if ((hsw-1) & ~0x3ff) {
 787                 DBG("Pruning mode: Horizontal Sync Width out of range");
 788                 return MODE_HSYNC_WIDE;
 789         }
 790
 791         if (vbp & ~0xff) {
 792                 DBG("Pruning mode: Vertical Back Porch out of range");
 793                 return MODE_VBLANK_WIDE;
 794         }
 795
 796         if (vfp & ~0xff) {
 797                 DBG("Pruning mode: Vertical Front Porch out of range");
 798                 return MODE_VBLANK_WIDE;
 799         }
 800
 801         if ((vsw-1) & ~0x3f) {
 802                 DBG("Pruning mode: Vertical Sync Width out of range");
 803                 return MODE_VSYNC_WIDE;
 804         }
 805
 806         /*
 807          * some devices have a maximum allowed pixel clock
 808          * configured from the DT
 809          */
 810         if (mode->clock > priv->max_pixelclock) {
 811                 DBG("Pruning mode: pixel clock too high");
 812                 return MODE_CLOCK_HIGH;
 813         }
 814
 815         /*
 816          * some devices further limit the max horizontal resolution
 817          * configured from the DT
 818          */
 819         if (mode->hdisplay > priv->max_width)
 820                 return MODE_BAD_WIDTH;
 821
 822         /* filter out modes that would require too much memory bandwidth: */
 823         bandwidth = mode->hdisplay * mode->vdisplay *
 824                 drm_mode_vrefresh(mode);
 825         if (bandwidth > priv->max_bandwidth) {
 826                 DBG("Pruning mode: exceeds defined bandwidth limit");
 827                 return MODE_BAD;
 828         }
 829
 830         return MODE_OK;
 831 }
 832
 833 void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
 834                 const struct tilcdc_panel_info *info)
 835 {
 836         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 837         tilcdc_crtc->info = info;
 838 }
 839
 840 void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
 841                                         bool simulate_vesa_sync)
 842 {
 843         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 844
 845         tilcdc_crtc->simulate_vesa_sync = simulate_vesa_sync;
 846 }
 847
 848 void tilcdc_crtc_update_clk(struct drm_crtc *crtc)
 849 {
 850         struct drm_device *dev = crtc->dev;
 851         struct tilcdc_drm_private *priv = dev->dev_private;
 852         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 853
 854         drm_modeset_lock(&crtc->mutex, NULL);
 855         if (tilcdc_crtc->lcd_fck_rate != clk_get_rate(priv->clk)) {
 856                 if (tilcdc_crtc_is_on(crtc)) {
 857                         pm_runtime_get_sync(dev->dev);
 858                         tilcdc_crtc_disable(crtc);
 859
 860                         tilcdc_crtc_set_clk(crtc);
 861
 862                         tilcdc_crtc_enable(crtc);
 863                         pm_runtime_put_sync(dev->dev);
 864                 }
 865         }
 866         drm_modeset_unlock(&crtc->mutex);
 867 }
 868
 869 #define SYNC_LOST_COUNT_LIMIT 50
 870
 871 irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 872 {
 873         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 874         struct drm_device *dev = crtc->dev;
 875         struct tilcdc_drm_private *priv = dev->dev_private;
 876         uint32_t stat, reg;
 877
 878         stat = tilcdc_read_irqstatus(dev);
 879         tilcdc_clear_irqstatus(dev, stat);
 880
 881         if (stat & LCDC_END_OF_FRAME0) {
 882                 unsigned long flags;
 883                 bool skip_event = false;
 884                 ktime_t now;
 885
 886                 now = ktime_get();
 887
 888                 spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);
 889
 890                 tilcdc_crtc->last_vblank = now;
 891
 892                 if (tilcdc_crtc->next_fb) {
 893                         set_scanout(crtc, tilcdc_crtc->next_fb);
 894                         tilcdc_crtc->next_fb = NULL;
 895                         skip_event = true;
 896                 }
 897
 898                 spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);
 899
 900                 drm_crtc_handle_vblank(crtc);
 901
 902                 if (!skip_event) {
 903                         struct drm_pending_vblank_event *event;
 904
 905                         spin_lock_irqsave(&dev->event_lock, flags);
 906
 907                         event = tilcdc_crtc->event;
 908                         tilcdc_crtc->event = NULL;
 909                         if (event)
 910                                 drm_crtc_send_vblank_event(crtc, event);
 911
 912                         spin_unlock_irqrestore(&dev->event_lock, flags);
 913                 }
 914
 915                 if (tilcdc_crtc->frame_intact)
 916                         tilcdc_crtc->sync_lost_count = 0;
 917                 else
 918                         tilcdc_crtc->frame_intact = true;
 919         }
 920
 921         if (stat & LCDC_FIFO_UNDERFLOW)
 922                 dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underflow",
 923                                     __func__, stat);
 924
 925         if (stat & LCDC_PL_LOAD_DONE) {
 926                 complete(&tilcdc_crtc->palette_loaded);
 927                 if (priv->rev == 1)
 928                         tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 929                                      LCDC_V1_PL_INT_ENA);
 930                 else
 931                         tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 932                                      LCDC_V2_PL_INT_ENA);
 933         }
 934
 935         if (stat & LCDC_SYNC_LOST) {
 936                 dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
 937                                     __func__, stat);
 938                 tilcdc_crtc->frame_intact = false;
 939                 if (priv->rev == 1) {
 940                         reg = tilcdc_read(dev, LCDC_RASTER_CTRL_REG);
 941                         if (reg & LCDC_RASTER_ENABLE) {
 942                                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 943                                              LCDC_RASTER_ENABLE);
 944                                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG,
 945                                            LCDC_RASTER_ENABLE);
 946                         }
 947                 } else {
 948                         if (tilcdc_crtc->sync_lost_count++ >
 949                             SYNC_LOST_COUNT_LIMIT) {
 950                                 dev_err(dev->dev,
 951                                         "%s(0x%08x): Sync lost flood detected, recovering",
 952                                         __func__, stat);
 953                                 queue_work(system_wq,
 954                                            &tilcdc_crtc->recover_work);
 955                                 tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 956                                              LCDC_SYNC_LOST);
 957                                 tilcdc_crtc->sync_lost_count = 0;
 958                         }
 959                 }
 960         }
 961
 962         if (stat & LCDC_FRAME_DONE) {
 963                 tilcdc_crtc->frame_done = true;
 964                 wake_up(&tilcdc_crtc->frame_done_wq);
 965                 /* rev 1 lcdc appears to hang if irq is not disbaled here */
 966                 if (priv->rev == 1)
 967                         tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 968                                      LCDC_V1_FRAME_DONE_INT_ENA);
 969         }
 970
 971         /* For revision 2 only */
 972         if (priv->rev == 2) {
 973                 /* Indicate to LCDC that the interrupt service routine has
 974                  * completed, see 13.3.6.1.6 in AM335x TRM.
 975                  */
 976                 tilcdc_write(dev, LCDC_END_OF_INT_IND_REG, 0);
 977         }
 978
 979         return IRQ_HANDLED;
 980 }
 981
 982 int tilcdc_crtc_create(struct drm_device *dev)
 983 {
 984         struct tilcdc_drm_private *priv = dev->dev_private;
 985         struct tilcdc_crtc *tilcdc_crtc;
 986         struct drm_crtc *crtc;
 987         int ret;
 988
 989         tilcdc_crtc = devm_kzalloc(dev->dev, sizeof(*tilcdc_crtc), GFP_KERNEL);
 990         if (!tilcdc_crtc)
 991                 return -ENOMEM;
 992
 993         init_completion(&tilcdc_crtc->palette_loaded);
 994         tilcdc_crtc->palette_base = dmam_alloc_coherent(dev->dev,
 995                                         TILCDC_PALETTE_SIZE,
 996                                         &tilcdc_crtc->palette_dma_handle,
 997                                         GFP_KERNEL | __GFP_ZERO);
 998         if (!tilcdc_crtc->palette_base)
 999                 return -ENOMEM;
1000         *tilcdc_crtc->palette_base = TILCDC_PALETTE_FIRST_ENTRY;
1001
1002         crtc = &tilcdc_crtc->base;
1003
1004         ret = tilcdc_plane_init(dev, &tilcdc_crtc->primary);
1005         if (ret < 0)
1006                 goto fail;
1007
1008         mutex_init(&tilcdc_crtc->enable_lock);
1009
1010         init_waitqueue_head(&tilcdc_crtc->frame_done_wq);
1011
1012         spin_lock_init(&tilcdc_crtc->irq_lock);
1013         INIT_WORK(&tilcdc_crtc->recover_work, tilcdc_crtc_recover_work);
1014
1015         ret = drm_crtc_init_with_planes(dev, crtc,
1016                                         &tilcdc_crtc->primary,
1017                                         NULL,
1018                                         &tilcdc_crtc_funcs,
1019                                         "tilcdc crtc");
1020         if (ret < 0)
1021                 goto fail;
1022
1023         drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs);
1024
1025         if (priv->is_componentized) {
1026                 crtc->port = of_graph_get_port_by_id(dev->dev->of_node, 0);
1027                 if (!crtc->port) { /* This should never happen */
1028                         dev_err(dev->dev, "Port node not found in %pOF\n",
1029                                 dev->dev->of_node);
1030                         ret = -EINVAL;
1031                         goto fail;
1032                 }
1033         }
1034
1035         priv->crtc = crtc;
1036         return 0;
1037
1038 fail:
1039         tilcdc_crtc_destroy(crtc);
1040         return ret;
1041 }