drivers/gpu/drm/tilcdc/tilcdc_crtc.c

   1 /*
   2  * Copyright (C) 2012 Texas Instruments
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <drm/drm_atomic.h>
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/drm_crtc.h>
  21 #include <drm/drm_flip_work.h>
  22 #include <drm/drm_plane_helper.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/completion.h>
  25 #include <linux/dma-mapping.h>
  26
  27 #include "tilcdc_drv.h"
  28 #include "tilcdc_regs.h"
  29
  30 #define TILCDC_VBLANK_SAFETY_THRESHOLD_US       1000
  31 #define TILCDC_PALETTE_SIZE                     32
  32 #define TILCDC_PALETTE_FIRST_ENTRY              0x4000
  33
  34 struct tilcdc_crtc {
  35         struct drm_crtc base;
  36
  37         struct drm_plane primary;
  38         const struct tilcdc_panel_info *info;
  39         struct drm_pending_vblank_event *event;
  40         struct mutex enable_lock;
  41         bool enabled;
  42         bool shutdown;
  43         wait_queue_head_t frame_done_wq;
  44         bool frame_done;
  45         spinlock_t irq_lock;
  46
  47         unsigned int lcd_fck_rate;
  48
  49         ktime_t last_vblank;
  50
  51         struct drm_framebuffer *curr_fb;
  52         struct drm_framebuffer *next_fb;
  53
  54         /* for deferred fb unref's: */
  55         struct drm_flip_work unref_work;
  56
  57         /* Only set if an external encoder is connected */
  58         bool simulate_vesa_sync;
  59
  60         int sync_lost_count;
  61         bool frame_intact;
  62         struct work_struct recover_work;
  63
  64         dma_addr_t palette_dma_handle;
  65         u16 *palette_base;
  66         struct completion palette_loaded;
  67 };
  68 #define to_tilcdc_crtc(x) container_of(x, struct tilcdc_crtc, base)
  69
  70 static void unref_worker(struct drm_flip_work *work, void *val)
  71 {
  72         struct tilcdc_crtc *tilcdc_crtc =
  73                 container_of(work, struct tilcdc_crtc, unref_work);
  74         struct drm_device *dev = tilcdc_crtc->base.dev;
  75
  76         mutex_lock(&dev->mode_config.mutex);
  77         drm_framebuffer_unreference(val);
  78         mutex_unlock(&dev->mode_config.mutex);
  79 }
  80
  81 static void set_scanout(struct drm_crtc *crtc, struct drm_framebuffer *fb)
  82 {
  83         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
  84         struct drm_device *dev = crtc->dev;
  85         struct tilcdc_drm_private *priv = dev->dev_private;
  86         struct drm_gem_cma_object *gem;
  87         dma_addr_t start, end;
  88         u64 dma_base_and_ceiling;
  89
  90         gem = drm_fb_cma_get_gem_obj(fb, 0);
  91
  92         start = gem->paddr + fb->offsets[0] +
  93                 crtc->y * fb->pitches[0] +
  94                 crtc->x * fb->format->cpp[0];
  95
  96         end = start + (crtc->mode.vdisplay * fb->pitches[0]);
  97
  98         /* Write LCDC_DMA_FB_BASE_ADDR_0_REG and LCDC_DMA_FB_CEILING_ADDR_0_REG
  99          * with a single insruction, if available. This should make it more
 100          * unlikely that LCDC would fetch the DMA addresses in the middle of
 101          * an update.
 102          */
 103         if (priv->rev == 1)
 104                 end -= 1;
 105
 106         dma_base_and_ceiling = (u64)end << 32 | start;
 107         tilcdc_write64(dev, LCDC_DMA_FB_BASE_ADDR_0_REG, dma_base_and_ceiling);
 108
 109         if (tilcdc_crtc->curr_fb)
 110                 drm_flip_work_queue(&tilcdc_crtc->unref_work,
 111                         tilcdc_crtc->curr_fb);
 112
 113         tilcdc_crtc->curr_fb = fb;
 114 }
 115
 116 /*
 117  * The driver currently only supports only true color formats. For
 118  * true color the palette block is bypassed, but a 32 byte palette
 119  * should still be loaded. The first 16-bit entry must be 0x4000 while
 120  * all other entries must be zeroed.
 121  */
 122 static void tilcdc_crtc_load_palette(struct drm_crtc *crtc)
 123 {
 124         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 125         struct drm_device *dev = crtc->dev;
 126         struct tilcdc_drm_private *priv = dev->dev_private;
 127         int ret;
 128
 129         reinit_completion(&tilcdc_crtc->palette_loaded);
 130
 131         /* Tell the LCDC where the palette is located. */
 132         tilcdc_write(dev, LCDC_DMA_FB_BASE_ADDR_0_REG,
 133                      tilcdc_crtc->palette_dma_handle);
 134         tilcdc_write(dev, LCDC_DMA_FB_CEILING_ADDR_0_REG,
 135                      (u32) tilcdc_crtc->palette_dma_handle +
 136                      TILCDC_PALETTE_SIZE - 1);
 137
 138         /* Set dma load mode for palette loading only. */
 139         tilcdc_write_mask(dev, LCDC_RASTER_CTRL_REG,
 140                           LCDC_PALETTE_LOAD_MODE(PALETTE_ONLY),
 141                           LCDC_PALETTE_LOAD_MODE_MASK);
 142
 143         /* Enable DMA Palette Loaded Interrupt */
 144         if (priv->rev == 1)
 145                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_PL_INT_ENA);
 146         else
 147                 tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG, LCDC_V2_PL_INT_ENA);
 148
 149         /* Enable LCDC DMA and wait for palette to be loaded. */
 150         tilcdc_clear_irqstatus(dev, 0xffffffff);
 151         tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 152
 153         ret = wait_for_completion_timeout(&tilcdc_crtc->palette_loaded,
 154                                           msecs_to_jiffies(50));
 155         if (ret == 0)
 156                 dev_err(dev->dev, "%s: Palette loading timeout", __func__);
 157
 158         /* Disable LCDC DMA and DMA Palette Loaded Interrupt. */
 159         tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 160         if (priv->rev == 1)
 161                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_PL_INT_ENA);
 162         else
 163                 tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG, LCDC_V2_PL_INT_ENA);
 164 }
 165
 166 static void tilcdc_crtc_enable_irqs(struct drm_device *dev)
 167 {
 168         struct tilcdc_drm_private *priv = dev->dev_private;
 169
 170         tilcdc_clear_irqstatus(dev, 0xffffffff);
 171
 172         if (priv->rev == 1) {
 173                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG,
 174                         LCDC_V1_SYNC_LOST_INT_ENA | LCDC_V1_FRAME_DONE_INT_ENA |
 175                         LCDC_V1_UNDERFLOW_INT_ENA);
 176                 tilcdc_set(dev, LCDC_DMA_CTRL_REG,
 177                         LCDC_V1_END_OF_FRAME_INT_ENA);
 178         } else {
 179                 tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG,
 180                         LCDC_V2_UNDERFLOW_INT_ENA |
 181                         LCDC_V2_END_OF_FRAME0_INT_ENA |
 182                         LCDC_FRAME_DONE | LCDC_SYNC_LOST);
 183         }
 184 }
 185
 186 static void tilcdc_crtc_disable_irqs(struct drm_device *dev)
 187 {
 188         struct tilcdc_drm_private *priv = dev->dev_private;
 189
 190         /* disable irqs that we might have enabled: */
 191         if (priv->rev == 1) {
 192                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 193                         LCDC_V1_SYNC_LOST_INT_ENA | LCDC_V1_FRAME_DONE_INT_ENA |
 194                         LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
 195                 tilcdc_clear(dev, LCDC_DMA_CTRL_REG,
 196                         LCDC_V1_END_OF_FRAME_INT_ENA);
 197         } else {
 198                 tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 199                         LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
 200                         LCDC_V2_END_OF_FRAME0_INT_ENA |
 201                         LCDC_FRAME_DONE | LCDC_SYNC_LOST);
 202         }
 203 }
 204
 205 static void reset(struct drm_crtc *crtc)
 206 {
 207         struct drm_device *dev = crtc->dev;
 208         struct tilcdc_drm_private *priv = dev->dev_private;
 209
 210         if (priv->rev != 2)
 211                 return;
 212
 213         tilcdc_set(dev, LCDC_CLK_RESET_REG, LCDC_CLK_MAIN_RESET);
 214         usleep_range(250, 1000);
 215         tilcdc_clear(dev, LCDC_CLK_RESET_REG, LCDC_CLK_MAIN_RESET);
 216 }
 217
 218 /*
 219  * Calculate the percentage difference between the requested pixel clock rate
 220  * and the effective rate resulting from calculating the clock divider value.
 221  */
 222 static unsigned int tilcdc_pclk_diff(unsigned long rate,
 223                                      unsigned long real_rate)
 224 {
 225         int r = rate / 100, rr = real_rate / 100;
 226
 227         return (unsigned int)(abs(((rr - r) * 100) / r));
 228 }
 229
 230 static void tilcdc_crtc_set_clk(struct drm_crtc *crtc)
 231 {
 232         struct drm_device *dev = crtc->dev;
 233         struct tilcdc_drm_private *priv = dev->dev_private;
 234         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 235         unsigned long clk_rate, real_rate, req_rate;
 236         unsigned int clkdiv;
 237         int ret;
 238
 239         clkdiv = 2; /* first try using a standard divider of 2 */
 240
 241         /* mode.clock is in KHz, set_rate wants parameter in Hz */
 242         req_rate = crtc->mode.clock * 1000;
 243
 244         ret = clk_set_rate(priv->clk, req_rate * clkdiv);
 245         clk_rate = clk_get_rate(priv->clk);
 246         if (ret < 0) {
 247                 /*
 248                  * If we fail to set the clock rate (some architectures don't
 249                  * use the common clock framework yet and may not implement
 250                  * all the clk API calls for every clock), try the next best
 251                  * thing: adjusting the clock divider, unless clk_get_rate()
 252                  * failed as well.
 253                  */
 254                 if (!clk_rate) {
 255                         /* Nothing more we can do. Just bail out. */
 256                         dev_err(dev->dev,
 257                                 "failed to set the pixel clock - unable to read current lcdc clock rate\n");
 258                         return;
 259                 }
 260
 261                 clkdiv = DIV_ROUND_CLOSEST(clk_rate, req_rate);
 262
 263                 /*
 264                  * Emit a warning if the real clock rate resulting from the
 265                  * calculated divider differs much from the requested rate.
 266                  *
 267                  * 5% is an arbitrary value - LCDs are usually quite tolerant
 268                  * about pixel clock rates.
 269                  */
 270                 real_rate = clkdiv * req_rate;
 271
 272                 if (tilcdc_pclk_diff(clk_rate, real_rate) > 5) {
 273                         dev_warn(dev->dev,
 274                                  "effective pixel clock rate (%luHz) differs from the calculated rate (%luHz)\n",
 275                                  clk_rate, real_rate);
 276                 }
 277         }
 278
 279         tilcdc_crtc->lcd_fck_rate = clk_rate;
 280
 281         DBG("lcd_clk=%u, mode clock=%d, div=%u",
 282             tilcdc_crtc->lcd_fck_rate, crtc->mode.clock, clkdiv);
 283
 284         /* Configure the LCD clock divisor. */
 285         tilcdc_write(dev, LCDC_CTRL_REG, LCDC_CLK_DIVISOR(clkdiv) |
 286                      LCDC_RASTER_MODE);
 287
 288         if (priv->rev == 2)
 289                 tilcdc_set(dev, LCDC_CLK_ENABLE_REG,
 290                                 LCDC_V2_DMA_CLK_EN | LCDC_V2_LIDD_CLK_EN |
 291                                 LCDC_V2_CORE_CLK_EN);
 292 }
 293
 294 static void tilcdc_crtc_set_mode(struct drm_crtc *crtc)
 295 {
 296         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 297         struct drm_device *dev = crtc->dev;
 298         struct tilcdc_drm_private *priv = dev->dev_private;
 299         const struct tilcdc_panel_info *info = tilcdc_crtc->info;
 300         uint32_t reg, hbp, hfp, hsw, vbp, vfp, vsw;
 301         struct drm_display_mode *mode = &crtc->state->adjusted_mode;
 302         struct drm_framebuffer *fb = crtc->primary->state->fb;
 303
 304         if (WARN_ON(!info))
 305                 return;
 306
 307         if (WARN_ON(!fb))
 308                 return;
 309
 310         /* Configure the Burst Size and fifo threshold of DMA: */
 311         reg = tilcdc_read(dev, LCDC_DMA_CTRL_REG) & ~0x00000770;
 312         switch (info->dma_burst_sz) {
 313         case 1:
 314                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_1);
 315                 break;
 316         case 2:
 317                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_2);
 318                 break;
 319         case 4:
 320                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_4);
 321                 break;
 322         case 8:
 323                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_8);
 324                 break;
 325         case 16:
 326                 reg |= LCDC_DMA_BURST_SIZE(LCDC_DMA_BURST_16);
 327                 break;
 328         default:
 329                 dev_err(dev->dev, "invalid burst size\n");
 330                 return;
 331         }
 332         reg |= (info->fifo_th << 8);
 333         tilcdc_write(dev, LCDC_DMA_CTRL_REG, reg);
 334
 335         /* Configure timings: */
 336         hbp = mode->htotal - mode->hsync_end;
 337         hfp = mode->hsync_start - mode->hdisplay;
 338         hsw = mode->hsync_end - mode->hsync_start;
 339         vbp = mode->vtotal - mode->vsync_end;
 340         vfp = mode->vsync_start - mode->vdisplay;
 341         vsw = mode->vsync_end - mode->vsync_start;
 342
 343         DBG("%dx%d, hbp=%u, hfp=%u, hsw=%u, vbp=%u, vfp=%u, vsw=%u",
 344             mode->hdisplay, mode->vdisplay, hbp, hfp, hsw, vbp, vfp, vsw);
 345
 346         /* Set AC Bias Period and Number of Transitions per Interrupt: */
 347         reg = tilcdc_read(dev, LCDC_RASTER_TIMING_2_REG) & ~0x000fff00;
 348         reg |= LCDC_AC_BIAS_FREQUENCY(info->ac_bias) |
 349                 LCDC_AC_BIAS_TRANSITIONS_PER_INT(info->ac_bias_intrpt);
 350
 351         /*
 352          * subtract one from hfp, hbp, hsw because the hardware uses
 353          * a value of 0 as 1
 354          */
 355         if (priv->rev == 2) {
 356                 /* clear bits we're going to set */
 357                 reg &= ~0x78000033;
 358                 reg |= ((hfp-1) & 0x300) >> 8;
 359                 reg |= ((hbp-1) & 0x300) >> 4;
 360                 reg |= ((hsw-1) & 0x3c0) << 21;
 361         }
 362         tilcdc_write(dev, LCDC_RASTER_TIMING_2_REG, reg);
 363
 364         reg = (((mode->hdisplay >> 4) - 1) << 4) |
 365                 (((hbp-1) & 0xff) << 24) |
 366                 (((hfp-1) & 0xff) << 16) |
 367                 (((hsw-1) & 0x3f) << 10);
 368         if (priv->rev == 2)
 369                 reg |= (((mode->hdisplay >> 4) - 1) & 0x40) >> 3;
 370         tilcdc_write(dev, LCDC_RASTER_TIMING_0_REG, reg);
 371
 372         reg = ((mode->vdisplay - 1) & 0x3ff) |
 373                 ((vbp & 0xff) << 24) |
 374                 ((vfp & 0xff) << 16) |
 375                 (((vsw-1) & 0x3f) << 10);
 376         tilcdc_write(dev, LCDC_RASTER_TIMING_1_REG, reg);
 377
 378         /*
 379          * be sure to set Bit 10 for the V2 LCDC controller,
 380          * otherwise limited to 1024 pixels width, stopping
 381          * 1920x1080 being supported.
 382          */
 383         if (priv->rev == 2) {
 384                 if ((mode->vdisplay - 1) & 0x400) {
 385                         tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG,
 386                                 LCDC_LPP_B10);
 387                 } else {
 388                         tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG,
 389                                 LCDC_LPP_B10);
 390                 }
 391         }
 392
 393         /* Configure display type: */
 394         reg = tilcdc_read(dev, LCDC_RASTER_CTRL_REG) &
 395                 ~(LCDC_TFT_MODE | LCDC_MONO_8BIT_MODE | LCDC_MONOCHROME_MODE |
 396                   LCDC_V2_TFT_24BPP_MODE | LCDC_V2_TFT_24BPP_UNPACK |
 397                   0x000ff000 /* Palette Loading Delay bits */);
 398         reg |= LCDC_TFT_MODE; /* no monochrome/passive support */
 399         if (info->tft_alt_mode)
 400                 reg |= LCDC_TFT_ALT_ENABLE;
 401         if (priv->rev == 2) {
 402                 switch (fb->format->format) {
 403                 case DRM_FORMAT_BGR565:
 404                 case DRM_FORMAT_RGB565:
 405                         break;
 406                 case DRM_FORMAT_XBGR8888:
 407                 case DRM_FORMAT_XRGB8888:
 408                         reg |= LCDC_V2_TFT_24BPP_UNPACK;
 409                         /* fallthrough */
 410                 case DRM_FORMAT_BGR888:
 411                 case DRM_FORMAT_RGB888:
 412                         reg |= LCDC_V2_TFT_24BPP_MODE;
 413                         break;
 414                 default:
 415                         dev_err(dev->dev, "invalid pixel format\n");
 416                         return;
 417                 }
 418         }
 419         reg |= info->fdd < 12;
 420         tilcdc_write(dev, LCDC_RASTER_CTRL_REG, reg);
 421
 422         if (info->invert_pxl_clk)
 423                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK);
 424         else
 425                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_PIXEL_CLOCK);
 426
 427         if (info->sync_ctrl)
 428                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL);
 429         else
 430                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_CTRL);
 431
 432         if (info->sync_edge)
 433                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE);
 434         else
 435                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_SYNC_EDGE);
 436
 437         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 438                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_HSYNC);
 439         else
 440                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_HSYNC);
 441
 442         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 443                 tilcdc_set(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_VSYNC);
 444         else
 445                 tilcdc_clear(dev, LCDC_RASTER_TIMING_2_REG, LCDC_INVERT_VSYNC);
 446
 447         if (info->raster_order)
 448                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ORDER);
 449         else
 450                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ORDER);
 451
 452         tilcdc_crtc_set_clk(crtc);
 453
 454         tilcdc_crtc_load_palette(crtc);
 455
 456         set_scanout(crtc, fb);
 457
 458         drm_framebuffer_reference(fb);
 459
 460         crtc->hwmode = crtc->state->adjusted_mode;
 461 }
 462
 463 static void tilcdc_crtc_enable(struct drm_crtc *crtc)
 464 {
 465         struct drm_device *dev = crtc->dev;
 466         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 467         unsigned long flags;
 468
 469         WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 470         mutex_lock(&tilcdc_crtc->enable_lock);
 471         if (tilcdc_crtc->enabled || tilcdc_crtc->shutdown) {
 472                 mutex_unlock(&tilcdc_crtc->enable_lock);
 473                 return;
 474         }
 475
 476         pm_runtime_get_sync(dev->dev);
 477
 478         reset(crtc);
 479
 480         tilcdc_crtc_set_mode(crtc);
 481
 482         tilcdc_crtc_enable_irqs(dev);
 483
 484         tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_DUAL_FRAME_BUFFER_ENABLE);
 485         tilcdc_write_mask(dev, LCDC_RASTER_CTRL_REG,
 486                           LCDC_PALETTE_LOAD_MODE(DATA_ONLY),
 487                           LCDC_PALETTE_LOAD_MODE_MASK);
 488
 489         /* There is no real chance for a race here as the time stamp
 490          * is taken before the raster DMA is started. The spin-lock is
 491          * taken to have a memory barrier after taking the time-stamp
 492          * and to avoid a context switch between taking the stamp and
 493          * enabling the raster.
 494          */
 495         spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);
 496         tilcdc_crtc->last_vblank = ktime_get();
 497         tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 498         spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);
 499
 500         drm_crtc_vblank_on(crtc);
 501
 502         tilcdc_crtc->enabled = true;
 503         mutex_unlock(&tilcdc_crtc->enable_lock);
 504 }
 505
 506 static void tilcdc_crtc_off(struct drm_crtc *crtc, bool shutdown)
 507 {
 508         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 509         struct drm_device *dev = crtc->dev;
 510         struct tilcdc_drm_private *priv = dev->dev_private;
 511         int ret;
 512
 513         mutex_lock(&tilcdc_crtc->enable_lock);
 514         if (shutdown)
 515                 tilcdc_crtc->shutdown = true;
 516         if (!tilcdc_crtc->enabled) {
 517                 mutex_unlock(&tilcdc_crtc->enable_lock);
 518                 return;
 519         }
 520         tilcdc_crtc->frame_done = false;
 521         tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 522
 523         /*
 524          * Wait for framedone irq which will still come before putting
 525          * things to sleep..
 526          */
 527         ret = wait_event_timeout(tilcdc_crtc->frame_done_wq,
 528                                  tilcdc_crtc->frame_done,
 529                                  msecs_to_jiffies(500));
 530         if (ret == 0)
 531                 dev_err(dev->dev, "%s: timeout waiting for framedone\n",
 532                         __func__);
 533
 534         drm_crtc_vblank_off(crtc);
 535
 536         tilcdc_crtc_disable_irqs(dev);
 537
 538         pm_runtime_put_sync(dev->dev);
 539
 540         if (tilcdc_crtc->next_fb) {
 541                 drm_flip_work_queue(&tilcdc_crtc->unref_work,
 542                                     tilcdc_crtc->next_fb);
 543                 tilcdc_crtc->next_fb = NULL;
 544         }
 545
 546         if (tilcdc_crtc->curr_fb) {
 547                 drm_flip_work_queue(&tilcdc_crtc->unref_work,
 548                                     tilcdc_crtc->curr_fb);
 549                 tilcdc_crtc->curr_fb = NULL;
 550         }
 551
 552         drm_flip_work_commit(&tilcdc_crtc->unref_work, priv->wq);
 553
 554         tilcdc_crtc->enabled = false;
 555         mutex_unlock(&tilcdc_crtc->enable_lock);
 556 }
 557
 558 static void tilcdc_crtc_disable(struct drm_crtc *crtc)
 559 {
 560         WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 561         tilcdc_crtc_off(crtc, false);
 562 }
 563
 564 void tilcdc_crtc_shutdown(struct drm_crtc *crtc)
 565 {
 566         tilcdc_crtc_off(crtc, true);
 567 }
 568
 569 static bool tilcdc_crtc_is_on(struct drm_crtc *crtc)
 570 {
 571         return crtc->state && crtc->state->enable && crtc->state->active;
 572 }
 573
 574 static void tilcdc_crtc_recover_work(struct work_struct *work)
 575 {
 576         struct tilcdc_crtc *tilcdc_crtc =
 577                 container_of(work, struct tilcdc_crtc, recover_work);
 578         struct drm_crtc *crtc = &tilcdc_crtc->base;
 579
 580         dev_info(crtc->dev->dev, "%s: Reset CRTC", __func__);
 581
 582         drm_modeset_lock_crtc(crtc, NULL);
 583
 584         if (!tilcdc_crtc_is_on(crtc))
 585                 goto out;
 586
 587         tilcdc_crtc_disable(crtc);
 588         tilcdc_crtc_enable(crtc);
 589 out:
 590         drm_modeset_unlock_crtc(crtc);
 591 }
 592
 593 static void tilcdc_crtc_destroy(struct drm_crtc *crtc)
 594 {
 595         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 596         struct tilcdc_drm_private *priv = crtc->dev->dev_private;
 597
 598         drm_modeset_lock_crtc(crtc, NULL);
 599         tilcdc_crtc_disable(crtc);
 600         drm_modeset_unlock_crtc(crtc);
 601
 602         flush_workqueue(priv->wq);
 603
 604         of_node_put(crtc->port);
 605         drm_crtc_cleanup(crtc);
 606         drm_flip_work_cleanup(&tilcdc_crtc->unref_work);
 607 }
 608
 609 int tilcdc_crtc_update_fb(struct drm_crtc *crtc,
 610                 struct drm_framebuffer *fb,
 611                 struct drm_pending_vblank_event *event)
 612 {
 613         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 614         struct drm_device *dev = crtc->dev;
 615
 616         WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
 617
 618         if (tilcdc_crtc->event) {
 619                 dev_err(dev->dev, "already pending page flip!\n");
 620                 return -EBUSY;
 621         }
 622
 623         drm_framebuffer_reference(fb);
 624
 625         crtc->primary->fb = fb;
 626         tilcdc_crtc->event = event;
 627
 628         mutex_lock(&tilcdc_crtc->enable_lock);
 629
 630         if (tilcdc_crtc->enabled) {
 631                 unsigned long flags;
 632                 ktime_t next_vblank;
 633                 s64 tdiff;
 634
 635                 spin_lock_irqsave(&tilcdc_crtc->irq_lock, flags);
 636
 637                 next_vblank = ktime_add_us(tilcdc_crtc->last_vblank,
 638                                            1000000 / crtc->hwmode.vrefresh);
 639                 tdiff = ktime_to_us(ktime_sub(next_vblank, ktime_get()));
 640
 641                 if (tdiff < TILCDC_VBLANK_SAFETY_THRESHOLD_US)
 642                         tilcdc_crtc->next_fb = fb;
 643                 else
 644                         set_scanout(crtc, fb);
 645
 646                 spin_unlock_irqrestore(&tilcdc_crtc->irq_lock, flags);
 647         }
 648
 649         mutex_unlock(&tilcdc_crtc->enable_lock);
 650
 651         return 0;
 652 }
 653
 654 static bool tilcdc_crtc_mode_fixup(struct drm_crtc *crtc,
 655                 const struct drm_display_mode *mode,
 656                 struct drm_display_mode *adjusted_mode)
 657 {
 658         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 659
 660         if (!tilcdc_crtc->simulate_vesa_sync)
 661                 return true;
 662
 663         /*
 664          * tilcdc does not generate VESA-compliant sync but aligns
 665          * VS on the second edge of HS instead of first edge.
 666          * We use adjusted_mode, to fixup sync by aligning both rising
 667          * edges and add HSKEW offset to fix the sync.
 668          */
 669         adjusted_mode->hskew = mode->hsync_end - mode->hsync_start;
 670         adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW;
 671
 672         if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
 673                 adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 674                 adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC;
 675         } else {
 676                 adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 677                 adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC;
 678         }
 679
 680         return true;
 681 }
 682
 683 static int tilcdc_crtc_atomic_check(struct drm_crtc *crtc,
 684                                     struct drm_crtc_state *state)
 685 {
 686         struct drm_display_mode *mode = &state->mode;
 687         int ret;
 688
 689         /* If we are not active we don't care */
 690         if (!state->active)
 691                 return 0;
 692
 693         if (state->state->planes[0].ptr != crtc->primary ||
 694             state->state->planes[0].state == NULL ||
 695             state->state->planes[0].state->crtc != crtc) {
 696                 dev_dbg(crtc->dev->dev, "CRTC primary plane must be present");
 697                 return -EINVAL;
 698         }
 699
 700         ret = tilcdc_crtc_mode_valid(crtc, mode);
 701         if (ret) {
 702                 dev_dbg(crtc->dev->dev, "Mode \"%s\" not valid", mode->name);
 703                 return -EINVAL;
 704         }
 705
 706         return 0;
 707 }
 708
 709 static int tilcdc_crtc_enable_vblank(struct drm_crtc *crtc)
 710 {
 711         return 0;
 712 }
 713
 714 static void tilcdc_crtc_disable_vblank(struct drm_crtc *crtc)
 715 {
 716 }
 717
 718 static const struct drm_crtc_funcs tilcdc_crtc_funcs = {
 719         .destroy        = tilcdc_crtc_destroy,
 720         .set_config     = drm_atomic_helper_set_config,
 721         .page_flip      = drm_atomic_helper_page_flip,
 722         .reset          = drm_atomic_helper_crtc_reset,
 723         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 724         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 725         .enable_vblank  = tilcdc_crtc_enable_vblank,
 726         .disable_vblank = tilcdc_crtc_disable_vblank,
 727 };
 728
 729 static const struct drm_crtc_helper_funcs tilcdc_crtc_helper_funcs = {
 730                 .mode_fixup     = tilcdc_crtc_mode_fixup,
 731                 .enable         = tilcdc_crtc_enable,
 732                 .disable        = tilcdc_crtc_disable,
 733                 .atomic_check   = tilcdc_crtc_atomic_check,
 734 };
 735
 736 int tilcdc_crtc_max_width(struct drm_crtc *crtc)
 737 {
 738         struct drm_device *dev = crtc->dev;
 739         struct tilcdc_drm_private *priv = dev->dev_private;
 740         int max_width = 0;
 741
 742         if (priv->rev == 1)
 743                 max_width = 1024;
 744         else if (priv->rev == 2)
 745                 max_width = 2048;
 746
 747         return max_width;
 748 }
 749
 750 int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode)
 751 {
 752         struct tilcdc_drm_private *priv = crtc->dev->dev_private;
 753         unsigned int bandwidth;
 754         uint32_t hbp, hfp, hsw, vbp, vfp, vsw;
 755
 756         /*
 757          * check to see if the width is within the range that
 758          * the LCD Controller physically supports
 759          */
 760         if (mode->hdisplay > tilcdc_crtc_max_width(crtc))
 761                 return MODE_VIRTUAL_X;
 762
 763         /* width must be multiple of 16 */
 764         if (mode->hdisplay & 0xf)
 765                 return MODE_VIRTUAL_X;
 766
 767         if (mode->vdisplay > 2048)
 768                 return MODE_VIRTUAL_Y;
 769
 770         DBG("Processing mode %dx%d@%d with pixel clock %d",
 771                 mode->hdisplay, mode->vdisplay,
 772                 drm_mode_vrefresh(mode), mode->clock);
 773
 774         hbp = mode->htotal - mode->hsync_end;
 775         hfp = mode->hsync_start - mode->hdisplay;
 776         hsw = mode->hsync_end - mode->hsync_start;
 777         vbp = mode->vtotal - mode->vsync_end;
 778         vfp = mode->vsync_start - mode->vdisplay;
 779         vsw = mode->vsync_end - mode->vsync_start;
 780
 781         if ((hbp-1) & ~0x3ff) {
 782                 DBG("Pruning mode: Horizontal Back Porch out of range");
 783                 return MODE_HBLANK_WIDE;
 784         }
 785
 786         if ((hfp-1) & ~0x3ff) {
 787                 DBG("Pruning mode: Horizontal Front Porch out of range");
 788                 return MODE_HBLANK_WIDE;
 789         }
 790
 791         if ((hsw-1) & ~0x3ff) {
 792                 DBG("Pruning mode: Horizontal Sync Width out of range");
 793                 return MODE_HSYNC_WIDE;
 794         }
 795
 796         if (vbp & ~0xff) {
 797                 DBG("Pruning mode: Vertical Back Porch out of range");
 798                 return MODE_VBLANK_WIDE;
 799         }
 800
 801         if (vfp & ~0xff) {
 802                 DBG("Pruning mode: Vertical Front Porch out of range");
 803                 return MODE_VBLANK_WIDE;
 804         }
 805
 806         if ((vsw-1) & ~0x3f) {
 807                 DBG("Pruning mode: Vertical Sync Width out of range");
 808                 return MODE_VSYNC_WIDE;
 809         }
 810
 811         /*
 812          * some devices have a maximum allowed pixel clock
 813          * configured from the DT
 814          */
 815         if (mode->clock > priv->max_pixelclock) {
 816                 DBG("Pruning mode: pixel clock too high");
 817                 return MODE_CLOCK_HIGH;
 818         }
 819
 820         /*
 821          * some devices further limit the max horizontal resolution
 822          * configured from the DT
 823          */
 824         if (mode->hdisplay > priv->max_width)
 825                 return MODE_BAD_WIDTH;
 826
 827         /* filter out modes that would require too much memory bandwidth: */
 828         bandwidth = mode->hdisplay * mode->vdisplay *
 829                 drm_mode_vrefresh(mode);
 830         if (bandwidth > priv->max_bandwidth) {
 831                 DBG("Pruning mode: exceeds defined bandwidth limit");
 832                 return MODE_BAD;
 833         }
 834
 835         return MODE_OK;
 836 }
 837
 838 void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
 839                 const struct tilcdc_panel_info *info)
 840 {
 841         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 842         tilcdc_crtc->info = info;
 843 }
 844
 845 void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
 846                                         bool simulate_vesa_sync)
 847 {
 848         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 849
 850         tilcdc_crtc->simulate_vesa_sync = simulate_vesa_sync;
 851 }
 852
 853 void tilcdc_crtc_update_clk(struct drm_crtc *crtc)
 854 {
 855         struct drm_device *dev = crtc->dev;
 856         struct tilcdc_drm_private *priv = dev->dev_private;
 857         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 858
 859         drm_modeset_lock_crtc(crtc, NULL);
 860         if (tilcdc_crtc->lcd_fck_rate != clk_get_rate(priv->clk)) {
 861                 if (tilcdc_crtc_is_on(crtc)) {
 862                         pm_runtime_get_sync(dev->dev);
 863                         tilcdc_crtc_disable(crtc);
 864
 865                         tilcdc_crtc_set_clk(crtc);
 866
 867                         tilcdc_crtc_enable(crtc);
 868                         pm_runtime_put_sync(dev->dev);
 869                 }
 870         }
 871         drm_modeset_unlock_crtc(crtc);
 872 }
 873
 874 #define SYNC_LOST_COUNT_LIMIT 50
 875
 876 irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 877 {
 878         struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 879         struct drm_device *dev = crtc->dev;
 880         struct tilcdc_drm_private *priv = dev->dev_private;
 881         uint32_t stat, reg;
 882
 883         stat = tilcdc_read_irqstatus(dev);
 884         tilcdc_clear_irqstatus(dev, stat);
 885
 886         if (stat & LCDC_END_OF_FRAME0) {
 887                 unsigned long flags;
 888                 bool skip_event = false;
 889                 ktime_t now;
 890
 891                 now = ktime_get();
 892
 893                 drm_flip_work_commit(&tilcdc_crtc->unref_work, priv->wq);
 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                 dev_err(dev->dev, "allocation failed\n");
 999                 return -ENOMEM;
1000         }
1001
1002         init_completion(&tilcdc_crtc->palette_loaded);
1003         tilcdc_crtc->palette_base = dmam_alloc_coherent(dev->dev,
1004                                         TILCDC_PALETTE_SIZE,
1005                                         &tilcdc_crtc->palette_dma_handle,
1006                                         GFP_KERNEL | __GFP_ZERO);
1007         if (!tilcdc_crtc->palette_base)
1008                 return -ENOMEM;
1009         *tilcdc_crtc->palette_base = TILCDC_PALETTE_FIRST_ENTRY;
1010
1011         crtc = &tilcdc_crtc->base;
1012
1013         ret = tilcdc_plane_init(dev, &tilcdc_crtc->primary);
1014         if (ret < 0)
1015                 goto fail;
1016
1017         mutex_init(&tilcdc_crtc->enable_lock);
1018
1019         init_waitqueue_head(&tilcdc_crtc->frame_done_wq);
1020
1021         drm_flip_work_init(&tilcdc_crtc->unref_work,
1022                         "unref", unref_worker);
1023
1024         spin_lock_init(&tilcdc_crtc->irq_lock);
1025         INIT_WORK(&tilcdc_crtc->recover_work, tilcdc_crtc_recover_work);
1026
1027         ret = drm_crtc_init_with_planes(dev, crtc,
1028                                         &tilcdc_crtc->primary,
1029                                         NULL,
1030                                         &tilcdc_crtc_funcs,
1031                                         "tilcdc crtc");
1032         if (ret < 0)
1033                 goto fail;
1034
1035         drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs);
1036
1037         if (priv->is_componentized) {
1038                 struct device_node *ports =
1039                         of_get_child_by_name(dev->dev->of_node, "ports");
1040
1041                 if (ports) {
1042                         crtc->port = of_get_child_by_name(ports, "port");
1043                         of_node_put(ports);
1044                 } else {
1045                         crtc->port =
1046                                 of_get_child_by_name(dev->dev->of_node, "port");
1047                 }
1048                 if (!crtc->port) { /* This should never happen */
1049                         dev_err(dev->dev, "Port node not found in %s\n",
1050                                 dev->dev->of_node->full_name);
1051                         ret = -EINVAL;
1052                         goto fail;
1053                 }
1054         }
1055
1056         priv->crtc = crtc;
1057         return 0;
1058
1059 fail:
1060         tilcdc_crtc_destroy(crtc);
1061         return ret;
1062 }