drivers/gpu/drm/rcar-du/rcar_du_kms.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * rcar_du_kms.c  --  R-Car Display Unit Mode Setting
   4  *
   5  * Copyright (C) 2013-2015 Renesas Electronics Corporation
   6  *
   7  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   8  */
   9
  10 #include <drm/drm_atomic.h>
  11 #include <drm/drm_atomic_helper.h>
  12 #include <drm/drm_crtc.h>
  13 #include <drm/drm_device.h>
  14 #include <drm/drm_fb_cma_helper.h>
  15 #include <drm/drm_gem_cma_helper.h>
  16 #include <drm/drm_gem_framebuffer_helper.h>
  17 #include <drm/drm_managed.h>
  18 #include <drm/drm_probe_helper.h>
  19 #include <drm/drm_vblank.h>
  20
  21 #include <linux/device.h>
  22 #include <linux/of_graph.h>
  23 #include <linux/of_platform.h>
  24 #include <linux/wait.h>
  25
  26 #include "rcar_du_crtc.h"
  27 #include "rcar_du_drv.h"
  28 #include "rcar_du_encoder.h"
  29 #include "rcar_du_kms.h"
  30 #include "rcar_du_regs.h"
  31 #include "rcar_du_vsp.h"
  32 #include "rcar_du_writeback.h"
  33
  34 /* -----------------------------------------------------------------------------
  35  * Format helpers
  36  */
  37
  38 static const struct rcar_du_format_info rcar_du_format_infos[] = {
  39         {
  40                 .fourcc = DRM_FORMAT_RGB565,
  41                 .v4l2 = V4L2_PIX_FMT_RGB565,
  42                 .bpp = 16,
  43                 .planes = 1,
  44                 .hsub = 1,
  45                 .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
  46                 .edf = PnDDCR4_EDF_NONE,
  47         }, {
  48                 .fourcc = DRM_FORMAT_ARGB1555,
  49                 .v4l2 = V4L2_PIX_FMT_ARGB555,
  50                 .bpp = 16,
  51                 .planes = 1,
  52                 .hsub = 1,
  53                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
  54                 .edf = PnDDCR4_EDF_NONE,
  55         }, {
  56                 .fourcc = DRM_FORMAT_XRGB1555,
  57                 .v4l2 = V4L2_PIX_FMT_XRGB555,
  58                 .bpp = 16,
  59                 .planes = 1,
  60                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
  61                 .edf = PnDDCR4_EDF_NONE,
  62         }, {
  63                 .fourcc = DRM_FORMAT_XRGB8888,
  64                 .v4l2 = V4L2_PIX_FMT_XBGR32,
  65                 .bpp = 32,
  66                 .planes = 1,
  67                 .hsub = 1,
  68                 .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
  69                 .edf = PnDDCR4_EDF_RGB888,
  70         }, {
  71                 .fourcc = DRM_FORMAT_ARGB8888,
  72                 .v4l2 = V4L2_PIX_FMT_ABGR32,
  73                 .bpp = 32,
  74                 .planes = 1,
  75                 .hsub = 1,
  76                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_16BPP,
  77                 .edf = PnDDCR4_EDF_ARGB8888,
  78         }, {
  79                 .fourcc = DRM_FORMAT_UYVY,
  80                 .v4l2 = V4L2_PIX_FMT_UYVY,
  81                 .bpp = 16,
  82                 .planes = 1,
  83                 .hsub = 2,
  84                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  85                 .edf = PnDDCR4_EDF_NONE,
  86         }, {
  87                 .fourcc = DRM_FORMAT_YUYV,
  88                 .v4l2 = V4L2_PIX_FMT_YUYV,
  89                 .bpp = 16,
  90                 .planes = 1,
  91                 .hsub = 2,
  92                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  93                 .edf = PnDDCR4_EDF_NONE,
  94         }, {
  95                 .fourcc = DRM_FORMAT_NV12,
  96                 .v4l2 = V4L2_PIX_FMT_NV12M,
  97                 .bpp = 12,
  98                 .planes = 2,
  99                 .hsub = 2,
 100                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
 101                 .edf = PnDDCR4_EDF_NONE,
 102         }, {
 103                 .fourcc = DRM_FORMAT_NV21,
 104                 .v4l2 = V4L2_PIX_FMT_NV21M,
 105                 .bpp = 12,
 106                 .planes = 2,
 107                 .hsub = 2,
 108                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
 109                 .edf = PnDDCR4_EDF_NONE,
 110         }, {
 111                 .fourcc = DRM_FORMAT_NV16,
 112                 .v4l2 = V4L2_PIX_FMT_NV16M,
 113                 .bpp = 16,
 114                 .planes = 2,
 115                 .hsub = 2,
 116                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
 117                 .edf = PnDDCR4_EDF_NONE,
 118         },
 119         /*
 120          * The following formats are not supported on Gen2 and thus have no
 121          * associated .pnmr or .edf settings.
 122          */
 123         {
 124                 .fourcc = DRM_FORMAT_RGB332,
 125                 .v4l2 = V4L2_PIX_FMT_RGB332,
 126                 .bpp = 8,
 127                 .planes = 1,
 128                 .hsub = 1,
 129         }, {
 130                 .fourcc = DRM_FORMAT_ARGB4444,
 131                 .v4l2 = V4L2_PIX_FMT_ARGB444,
 132                 .bpp = 16,
 133                 .planes = 1,
 134                 .hsub = 1,
 135         }, {
 136                 .fourcc = DRM_FORMAT_XRGB4444,
 137                 .v4l2 = V4L2_PIX_FMT_XRGB444,
 138                 .bpp = 16,
 139                 .planes = 1,
 140                 .hsub = 1,
 141         }, {
 142                 .fourcc = DRM_FORMAT_RGBA4444,
 143                 .v4l2 = V4L2_PIX_FMT_RGBA444,
 144                 .bpp = 16,
 145                 .planes = 1,
 146                 .hsub = 1,
 147         }, {
 148                 .fourcc = DRM_FORMAT_RGBX4444,
 149                 .v4l2 = V4L2_PIX_FMT_RGBX444,
 150                 .bpp = 16,
 151                 .planes = 1,
 152                 .hsub = 1,
 153         }, {
 154                 .fourcc = DRM_FORMAT_ABGR4444,
 155                 .v4l2 = V4L2_PIX_FMT_ABGR444,
 156                 .bpp = 16,
 157                 .planes = 1,
 158                 .hsub = 1,
 159         }, {
 160                 .fourcc = DRM_FORMAT_XBGR4444,
 161                 .v4l2 = V4L2_PIX_FMT_XBGR444,
 162                 .bpp = 16,
 163                 .planes = 1,
 164                 .hsub = 1,
 165         }, {
 166                 .fourcc = DRM_FORMAT_BGRA4444,
 167                 .v4l2 = V4L2_PIX_FMT_BGRA444,
 168                 .bpp = 16,
 169                 .planes = 1,
 170                 .hsub = 1,
 171         }, {
 172                 .fourcc = DRM_FORMAT_BGRX4444,
 173                 .v4l2 = V4L2_PIX_FMT_BGRX444,
 174                 .bpp = 16,
 175                 .planes = 1,
 176                 .hsub = 1,
 177         }, {
 178                 .fourcc = DRM_FORMAT_RGBA5551,
 179                 .v4l2 = V4L2_PIX_FMT_RGBA555,
 180                 .bpp = 16,
 181                 .planes = 1,
 182                 .hsub = 1,
 183         }, {
 184                 .fourcc = DRM_FORMAT_RGBX5551,
 185                 .v4l2 = V4L2_PIX_FMT_RGBX555,
 186                 .bpp = 16,
 187                 .planes = 1,
 188                 .hsub = 1,
 189         }, {
 190                 .fourcc = DRM_FORMAT_ABGR1555,
 191                 .v4l2 = V4L2_PIX_FMT_ABGR555,
 192                 .bpp = 16,
 193                 .planes = 1,
 194                 .hsub = 1,
 195         }, {
 196                 .fourcc = DRM_FORMAT_XBGR1555,
 197                 .v4l2 = V4L2_PIX_FMT_XBGR555,
 198                 .bpp = 16,
 199                 .planes = 1,
 200                 .hsub = 1,
 201         }, {
 202                 .fourcc = DRM_FORMAT_BGRA5551,
 203                 .v4l2 = V4L2_PIX_FMT_BGRA555,
 204                 .bpp = 16,
 205                 .planes = 1,
 206                 .hsub = 1,
 207         }, {
 208                 .fourcc = DRM_FORMAT_BGRX5551,
 209                 .v4l2 = V4L2_PIX_FMT_BGRX555,
 210                 .bpp = 16,
 211                 .planes = 1,
 212                 .hsub = 1,
 213         }, {
 214                 .fourcc = DRM_FORMAT_BGR888,
 215                 .v4l2 = V4L2_PIX_FMT_RGB24,
 216                 .bpp = 24,
 217                 .planes = 1,
 218                 .hsub = 1,
 219         }, {
 220                 .fourcc = DRM_FORMAT_RGB888,
 221                 .v4l2 = V4L2_PIX_FMT_BGR24,
 222                 .bpp = 24,
 223                 .planes = 1,
 224                 .hsub = 1,
 225         }, {
 226                 .fourcc = DRM_FORMAT_RGBA8888,
 227                 .v4l2 = V4L2_PIX_FMT_BGRA32,
 228                 .bpp = 32,
 229                 .planes = 1,
 230                 .hsub = 1,
 231         }, {
 232                 .fourcc = DRM_FORMAT_RGBX8888,
 233                 .v4l2 = V4L2_PIX_FMT_BGRX32,
 234                 .bpp = 32,
 235                 .planes = 1,
 236                 .hsub = 1,
 237         }, {
 238                 .fourcc = DRM_FORMAT_ABGR8888,
 239                 .v4l2 = V4L2_PIX_FMT_RGBA32,
 240                 .bpp = 32,
 241                 .planes = 1,
 242                 .hsub = 1,
 243         }, {
 244                 .fourcc = DRM_FORMAT_XBGR8888,
 245                 .v4l2 = V4L2_PIX_FMT_RGBX32,
 246                 .bpp = 32,
 247                 .planes = 1,
 248                 .hsub = 1,
 249         }, {
 250                 .fourcc = DRM_FORMAT_BGRA8888,
 251                 .v4l2 = V4L2_PIX_FMT_ARGB32,
 252                 .bpp = 32,
 253                 .planes = 1,
 254                 .hsub = 1,
 255         }, {
 256                 .fourcc = DRM_FORMAT_BGRX8888,
 257                 .v4l2 = V4L2_PIX_FMT_XRGB32,
 258                 .bpp = 32,
 259                 .planes = 1,
 260                 .hsub = 1,
 261         }, {
 262                 .fourcc = DRM_FORMAT_YVYU,
 263                 .v4l2 = V4L2_PIX_FMT_YVYU,
 264                 .bpp = 16,
 265                 .planes = 1,
 266                 .hsub = 2,
 267         }, {
 268                 .fourcc = DRM_FORMAT_NV61,
 269                 .v4l2 = V4L2_PIX_FMT_NV61M,
 270                 .bpp = 16,
 271                 .planes = 2,
 272                 .hsub = 2,
 273         }, {
 274                 .fourcc = DRM_FORMAT_YUV420,
 275                 .v4l2 = V4L2_PIX_FMT_YUV420M,
 276                 .bpp = 12,
 277                 .planes = 3,
 278                 .hsub = 2,
 279         }, {
 280                 .fourcc = DRM_FORMAT_YVU420,
 281                 .v4l2 = V4L2_PIX_FMT_YVU420M,
 282                 .bpp = 12,
 283                 .planes = 3,
 284                 .hsub = 2,
 285         }, {
 286                 .fourcc = DRM_FORMAT_YUV422,
 287                 .v4l2 = V4L2_PIX_FMT_YUV422M,
 288                 .bpp = 16,
 289                 .planes = 3,
 290                 .hsub = 2,
 291         }, {
 292                 .fourcc = DRM_FORMAT_YVU422,
 293                 .v4l2 = V4L2_PIX_FMT_YVU422M,
 294                 .bpp = 16,
 295                 .planes = 3,
 296                 .hsub = 2,
 297         }, {
 298                 .fourcc = DRM_FORMAT_YUV444,
 299                 .v4l2 = V4L2_PIX_FMT_YUV444M,
 300                 .bpp = 24,
 301                 .planes = 3,
 302                 .hsub = 1,
 303         }, {
 304                 .fourcc = DRM_FORMAT_YVU444,
 305                 .v4l2 = V4L2_PIX_FMT_YVU444M,
 306                 .bpp = 24,
 307                 .planes = 3,
 308                 .hsub = 1,
 309         },
 310 };
 311
 312 const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc)
 313 {
 314         unsigned int i;
 315
 316         for (i = 0; i < ARRAY_SIZE(rcar_du_format_infos); ++i) {
 317                 if (rcar_du_format_infos[i].fourcc == fourcc)
 318                         return &rcar_du_format_infos[i];
 319         }
 320
 321         return NULL;
 322 }
 323
 324 /* -----------------------------------------------------------------------------
 325  * Frame buffer
 326  */
 327
 328 int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
 329                         struct drm_mode_create_dumb *args)
 330 {
 331         struct rcar_du_device *rcdu = to_rcar_du_device(dev);
 332         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 333         unsigned int align;
 334
 335         /*
 336          * The R8A7779 DU requires a 16 pixels pitch alignment as documented,
 337          * but the R8A7790 DU seems to require a 128 bytes pitch alignment.
 338          */
 339         if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
 340                 align = 128;
 341         else
 342                 align = 16 * args->bpp / 8;
 343
 344         args->pitch = roundup(min_pitch, align);
 345
 346         return drm_gem_cma_dumb_create_internal(file, dev, args);
 347 }
 348
 349 static struct drm_framebuffer *
 350 rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 351                   const struct drm_mode_fb_cmd2 *mode_cmd)
 352 {
 353         struct rcar_du_device *rcdu = to_rcar_du_device(dev);
 354         const struct rcar_du_format_info *format;
 355         unsigned int chroma_pitch;
 356         unsigned int max_pitch;
 357         unsigned int align;
 358         unsigned int i;
 359
 360         format = rcar_du_format_info(mode_cmd->pixel_format);
 361         if (format == NULL) {
 362                 dev_dbg(dev->dev, "unsupported pixel format %08x\n",
 363                         mode_cmd->pixel_format);
 364                 return ERR_PTR(-EINVAL);
 365         }
 366
 367         if (rcdu->info->gen < 3) {
 368                 /*
 369                  * On Gen2 the DU limits the pitch to 4095 pixels and requires
 370                  * buffers to be aligned to a 16 pixels boundary (or 128 bytes
 371                  * on some platforms).
 372                  */
 373                 unsigned int bpp = format->planes == 1 ? format->bpp / 8 : 1;
 374
 375                 max_pitch = 4095 * bpp;
 376
 377                 if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
 378                         align = 128;
 379                 else
 380                         align = 16 * bpp;
 381         } else {
 382                 /*
 383                  * On Gen3 the memory interface is handled by the VSP that
 384                  * limits the pitch to 65535 bytes and has no alignment
 385                  * constraint.
 386                  */
 387                 max_pitch = 65535;
 388                 align = 1;
 389         }
 390
 391         if (mode_cmd->pitches[0] & (align - 1) ||
 392             mode_cmd->pitches[0] > max_pitch) {
 393                 dev_dbg(dev->dev, "invalid pitch value %u\n",
 394                         mode_cmd->pitches[0]);
 395                 return ERR_PTR(-EINVAL);
 396         }
 397
 398         /*
 399          * Calculate the chroma plane(s) pitch using the horizontal subsampling
 400          * factor. For semi-planar formats, the U and V planes are combined, the
 401          * pitch must thus be doubled.
 402          */
 403         chroma_pitch = mode_cmd->pitches[0] / format->hsub;
 404         if (format->planes == 2)
 405                 chroma_pitch *= 2;
 406
 407         for (i = 1; i < format->planes; ++i) {
 408                 if (mode_cmd->pitches[i] != chroma_pitch) {
 409                         dev_dbg(dev->dev,
 410                                 "luma and chroma pitches are not compatible\n");
 411                         return ERR_PTR(-EINVAL);
 412                 }
 413         }
 414
 415         return drm_gem_fb_create(dev, file_priv, mode_cmd);
 416 }
 417
 418 /* -----------------------------------------------------------------------------
 419  * Atomic Check and Update
 420  */
 421
 422 static int rcar_du_atomic_check(struct drm_device *dev,
 423                                 struct drm_atomic_state *state)
 424 {
 425         struct rcar_du_device *rcdu = to_rcar_du_device(dev);
 426         int ret;
 427
 428         ret = drm_atomic_helper_check(dev, state);
 429         if (ret)
 430                 return ret;
 431
 432         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE))
 433                 return 0;
 434
 435         return rcar_du_atomic_check_planes(dev, state);
 436 }
 437
 438 static void rcar_du_atomic_commit_tail(struct drm_atomic_state *old_state)
 439 {
 440         struct drm_device *dev = old_state->dev;
 441         struct rcar_du_device *rcdu = to_rcar_du_device(dev);
 442         struct drm_crtc_state *crtc_state;
 443         struct drm_crtc *crtc;
 444         unsigned int i;
 445
 446         /*
 447          * Store RGB routing to DPAD0 and DPAD1, the hardware will be configured
 448          * when starting the CRTCs.
 449          */
 450         rcdu->dpad1_source = -1;
 451
 452         for_each_new_crtc_in_state(old_state, crtc, crtc_state, i) {
 453                 struct rcar_du_crtc_state *rcrtc_state =
 454                         to_rcar_crtc_state(crtc_state);
 455                 struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
 456
 457                 if (rcrtc_state->outputs & BIT(RCAR_DU_OUTPUT_DPAD0))
 458                         rcdu->dpad0_source = rcrtc->index;
 459
 460                 if (rcrtc_state->outputs & BIT(RCAR_DU_OUTPUT_DPAD1))
 461                         rcdu->dpad1_source = rcrtc->index;
 462         }
 463
 464         /* Apply the atomic update. */
 465         drm_atomic_helper_commit_modeset_disables(dev, old_state);
 466         drm_atomic_helper_commit_planes(dev, old_state,
 467                                         DRM_PLANE_COMMIT_ACTIVE_ONLY);
 468         drm_atomic_helper_commit_modeset_enables(dev, old_state);
 469
 470         drm_atomic_helper_commit_hw_done(old_state);
 471         drm_atomic_helper_wait_for_flip_done(dev, old_state);
 472
 473         drm_atomic_helper_cleanup_planes(dev, old_state);
 474 }
 475
 476 /* -----------------------------------------------------------------------------
 477  * Initialization
 478  */
 479
 480 static const struct drm_mode_config_helper_funcs rcar_du_mode_config_helper = {
 481         .atomic_commit_tail = rcar_du_atomic_commit_tail,
 482 };
 483
 484 static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = {
 485         .fb_create = rcar_du_fb_create,
 486         .atomic_check = rcar_du_atomic_check,
 487         .atomic_commit = drm_atomic_helper_commit,
 488 };
 489
 490 static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
 491                                      enum rcar_du_output output,
 492                                      struct of_endpoint *ep)
 493 {
 494         struct device_node *entity;
 495         int ret;
 496
 497         /* Locate the connected entity and initialize the encoder. */
 498         entity = of_graph_get_remote_port_parent(ep->local_node);
 499         if (!entity) {
 500                 dev_dbg(rcdu->dev, "unconnected endpoint %pOF, skipping\n",
 501                         ep->local_node);
 502                 return -ENODEV;
 503         }
 504
 505         if (!of_device_is_available(entity)) {
 506                 dev_dbg(rcdu->dev,
 507                         "connected entity %pOF is disabled, skipping\n",
 508                         entity);
 509                 of_node_put(entity);
 510                 return -ENODEV;
 511         }
 512
 513         ret = rcar_du_encoder_init(rcdu, output, entity);
 514         if (ret && ret != -EPROBE_DEFER && ret != -ENOLINK)
 515                 dev_warn(rcdu->dev,
 516                          "failed to initialize encoder %pOF on output %u (%d), skipping\n",
 517                          entity, output, ret);
 518
 519         of_node_put(entity);
 520
 521         return ret;
 522 }
 523
 524 static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
 525 {
 526         struct device_node *np = rcdu->dev->of_node;
 527         struct device_node *ep_node;
 528         unsigned int num_encoders = 0;
 529
 530         /*
 531          * Iterate over the endpoints and create one encoder for each output
 532          * pipeline.
 533          */
 534         for_each_endpoint_of_node(np, ep_node) {
 535                 enum rcar_du_output output;
 536                 struct of_endpoint ep;
 537                 unsigned int i;
 538                 int ret;
 539
 540                 ret = of_graph_parse_endpoint(ep_node, &ep);
 541                 if (ret < 0) {
 542                         of_node_put(ep_node);
 543                         return ret;
 544                 }
 545
 546                 /* Find the output route corresponding to the port number. */
 547                 for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
 548                         if (rcdu->info->routes[i].possible_crtcs &&
 549                             rcdu->info->routes[i].port == ep.port) {
 550                                 output = i;
 551                                 break;
 552                         }
 553                 }
 554
 555                 if (i == RCAR_DU_OUTPUT_MAX) {
 556                         dev_warn(rcdu->dev,
 557                                  "port %u references unexisting output, skipping\n",
 558                                  ep.port);
 559                         continue;
 560                 }
 561
 562                 /* Process the output pipeline. */
 563                 ret = rcar_du_encoders_init_one(rcdu, output, &ep);
 564                 if (ret < 0) {
 565                         if (ret == -EPROBE_DEFER) {
 566                                 of_node_put(ep_node);
 567                                 return ret;
 568                         }
 569
 570                         continue;
 571                 }
 572
 573                 num_encoders++;
 574         }
 575
 576         return num_encoders;
 577 }
 578
 579 static int rcar_du_properties_init(struct rcar_du_device *rcdu)
 580 {
 581         /*
 582          * The color key is expressed as an RGB888 triplet stored in a 32-bit
 583          * integer in XRGB8888 format. Bit 24 is used as a flag to disable (0)
 584          * or enable source color keying (1).
 585          */
 586         rcdu->props.colorkey =
 587                 drm_property_create_range(&rcdu->ddev, 0, "colorkey",
 588                                           0, 0x01ffffff);
 589         if (rcdu->props.colorkey == NULL)
 590                 return -ENOMEM;
 591
 592         return 0;
 593 }
 594
 595 static int rcar_du_vsps_init(struct rcar_du_device *rcdu)
 596 {
 597         const struct device_node *np = rcdu->dev->of_node;
 598         const char *vsps_prop_name = "renesas,vsps";
 599         struct of_phandle_args args;
 600         struct {
 601                 struct device_node *np;
 602                 unsigned int crtcs_mask;
 603         } vsps[RCAR_DU_MAX_VSPS] = { { NULL, }, };
 604         unsigned int vsps_count = 0;
 605         unsigned int cells;
 606         unsigned int i;
 607         int ret;
 608
 609         /*
 610          * First parse the DT vsps property to populate the list of VSPs. Each
 611          * entry contains a pointer to the VSP DT node and a bitmask of the
 612          * connected DU CRTCs.
 613          */
 614         ret = of_property_count_u32_elems(np, vsps_prop_name);
 615         if (ret < 0) {
 616                 /* Backward compatibility with old DTBs. */
 617                 vsps_prop_name = "vsps";
 618                 ret = of_property_count_u32_elems(np, vsps_prop_name);
 619         }
 620         cells = ret / rcdu->num_crtcs - 1;
 621         if (cells > 1)
 622                 return -EINVAL;
 623
 624         for (i = 0; i < rcdu->num_crtcs; ++i) {
 625                 unsigned int j;
 626
 627                 ret = of_parse_phandle_with_fixed_args(np, vsps_prop_name,
 628                                                        cells, i, &args);
 629                 if (ret < 0)
 630                         goto error;
 631
 632                 /*
 633                  * Add the VSP to the list or update the corresponding existing
 634                  * entry if the VSP has already been added.
 635                  */
 636                 for (j = 0; j < vsps_count; ++j) {
 637                         if (vsps[j].np == args.np)
 638                                 break;
 639                 }
 640
 641                 if (j < vsps_count)
 642                         of_node_put(args.np);
 643                 else
 644                         vsps[vsps_count++].np = args.np;
 645
 646                 vsps[j].crtcs_mask |= BIT(i);
 647
 648                 /*
 649                  * Store the VSP pointer and pipe index in the CRTC. If the
 650                  * second cell of the 'renesas,vsps' specifier isn't present,
 651                  * default to 0 to remain compatible with older DT bindings.
 652                  */
 653                 rcdu->crtcs[i].vsp = &rcdu->vsps[j];
 654                 rcdu->crtcs[i].vsp_pipe = cells >= 1 ? args.args[0] : 0;
 655         }
 656
 657         /*
 658          * Then initialize all the VSPs from the node pointers and CRTCs bitmask
 659          * computed previously.
 660          */
 661         for (i = 0; i < vsps_count; ++i) {
 662                 struct rcar_du_vsp *vsp = &rcdu->vsps[i];
 663
 664                 vsp->index = i;
 665                 vsp->dev = rcdu;
 666
 667                 ret = rcar_du_vsp_init(vsp, vsps[i].np, vsps[i].crtcs_mask);
 668                 if (ret < 0)
 669                         goto error;
 670         }
 671
 672         return 0;
 673
 674 error:
 675         for (i = 0; i < ARRAY_SIZE(vsps); ++i)
 676                 of_node_put(vsps[i].np);
 677
 678         return ret;
 679 }
 680
 681 static int rcar_du_cmm_init(struct rcar_du_device *rcdu)
 682 {
 683         const struct device_node *np = rcdu->dev->of_node;
 684         unsigned int i;
 685         int cells;
 686
 687         cells = of_property_count_u32_elems(np, "renesas,cmms");
 688         if (cells == -EINVAL)
 689                 return 0;
 690
 691         if (cells > rcdu->num_crtcs) {
 692                 dev_err(rcdu->dev,
 693                         "Invalid number of entries in 'renesas,cmms'\n");
 694                 return -EINVAL;
 695         }
 696
 697         for (i = 0; i < cells; ++i) {
 698                 struct platform_device *pdev;
 699                 struct device_link *link;
 700                 struct device_node *cmm;
 701                 int ret;
 702
 703                 cmm = of_parse_phandle(np, "renesas,cmms", i);
 704                 if (!cmm) {
 705                         dev_err(rcdu->dev,
 706                                 "Failed to parse 'renesas,cmms' property\n");
 707                         return -EINVAL;
 708                 }
 709
 710                 if (!of_device_is_available(cmm)) {
 711                         /* It's fine to have a phandle to a non-enabled CMM. */
 712                         of_node_put(cmm);
 713                         continue;
 714                 }
 715
 716                 pdev = of_find_device_by_node(cmm);
 717                 if (!pdev) {
 718                         dev_err(rcdu->dev, "No device found for CMM%u\n", i);
 719                         of_node_put(cmm);
 720                         return -EINVAL;
 721                 }
 722
 723                 of_node_put(cmm);
 724
 725                 /*
 726                  * -ENODEV is used to report that the CMM config option is
 727                  * disabled: return 0 and let the DU continue probing.
 728                  */
 729                 ret = rcar_cmm_init(pdev);
 730                 if (ret) {
 731                         platform_device_put(pdev);
 732                         return ret == -ENODEV ? 0 : ret;
 733                 }
 734
 735                 rcdu->cmms[i] = pdev;
 736
 737                 /*
 738                  * Enforce suspend/resume ordering by making the CMM a provider
 739                  * of the DU: CMM is suspended after and resumed before the DU.
 740                  */
 741                 link = device_link_add(rcdu->dev, &pdev->dev, DL_FLAG_STATELESS);
 742                 if (!link) {
 743                         dev_err(rcdu->dev,
 744                                 "Failed to create device link to CMM%u\n", i);
 745                         return -EINVAL;
 746                 }
 747         }
 748
 749         return 0;
 750 }
 751
 752 static void rcar_du_modeset_cleanup(struct drm_device *dev, void *res)
 753 {
 754         struct rcar_du_device *rcdu = to_rcar_du_device(dev);
 755         unsigned int i;
 756
 757         for (i = 0; i < ARRAY_SIZE(rcdu->cmms); ++i)
 758                 platform_device_put(rcdu->cmms[i]);
 759 }
 760
 761 int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 762 {
 763         static const unsigned int mmio_offsets[] = {
 764                 DU0_REG_OFFSET, DU2_REG_OFFSET
 765         };
 766
 767         struct drm_device *dev = &rcdu->ddev;
 768         struct drm_encoder *encoder;
 769         unsigned int dpad0_sources;
 770         unsigned int num_encoders;
 771         unsigned int num_groups;
 772         unsigned int swindex;
 773         unsigned int hwindex;
 774         unsigned int i;
 775         int ret;
 776
 777         ret = drmm_mode_config_init(dev);
 778         if (ret)
 779                 return ret;
 780
 781         ret = drmm_add_action(&rcdu->ddev, rcar_du_modeset_cleanup, NULL);
 782         if (ret)
 783                 return ret;
 784
 785         dev->mode_config.min_width = 0;
 786         dev->mode_config.min_height = 0;
 787         dev->mode_config.normalize_zpos = true;
 788         dev->mode_config.funcs = &rcar_du_mode_config_funcs;
 789         dev->mode_config.helper_private = &rcar_du_mode_config_helper;
 790
 791         if (rcdu->info->gen < 3) {
 792                 dev->mode_config.max_width = 4095;
 793                 dev->mode_config.max_height = 2047;
 794         } else {
 795                 /*
 796                  * The Gen3 DU uses the VSP1 for memory access, and is limited
 797                  * to frame sizes of 8190x8190.
 798                  */
 799                 dev->mode_config.max_width = 8190;
 800                 dev->mode_config.max_height = 8190;
 801         }
 802
 803         rcdu->num_crtcs = hweight8(rcdu->info->channels_mask);
 804
 805         ret = rcar_du_properties_init(rcdu);
 806         if (ret < 0)
 807                 return ret;
 808
 809         /*
 810          * Initialize vertical blanking interrupts handling. Start with vblank
 811          * disabled for all CRTCs.
 812          */
 813         ret = drm_vblank_init(dev, rcdu->num_crtcs);
 814         if (ret < 0)
 815                 return ret;
 816
 817         /* Initialize the groups. */
 818         num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);
 819
 820         for (i = 0; i < num_groups; ++i) {
 821                 struct rcar_du_group *rgrp = &rcdu->groups[i];
 822
 823                 mutex_init(&rgrp->lock);
 824
 825                 rgrp->dev = rcdu;
 826                 rgrp->mmio_offset = mmio_offsets[i];
 827                 rgrp->index = i;
 828                 /* Extract the channel mask for this group only. */
 829                 rgrp->channels_mask = (rcdu->info->channels_mask >> (2 * i))
 830                                    & GENMASK(1, 0);
 831                 rgrp->num_crtcs = hweight8(rgrp->channels_mask);
 832
 833                 /*
 834                  * If we have more than one CRTCs in this group pre-associate
 835                  * the low-order planes with CRTC 0 and the high-order planes
 836                  * with CRTC 1 to minimize flicker occurring when the
 837                  * association is changed.
 838                  */
 839                 rgrp->dptsr_planes = rgrp->num_crtcs > 1
 840                                    ? (rcdu->info->gen >= 3 ? 0x04 : 0xf0)
 841                                    : 0;
 842
 843                 if (!rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE)) {
 844                         ret = rcar_du_planes_init(rgrp);
 845                         if (ret < 0)
 846                                 return ret;
 847                 }
 848         }
 849
 850         /* Initialize the compositors. */
 851         if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE)) {
 852                 ret = rcar_du_vsps_init(rcdu);
 853                 if (ret < 0)
 854                         return ret;
 855         }
 856
 857         /* Initialize the Color Management Modules. */
 858         ret = rcar_du_cmm_init(rcdu);
 859         if (ret)
 860                 return ret;
 861
 862         /* Create the CRTCs. */
 863         for (swindex = 0, hwindex = 0; swindex < rcdu->num_crtcs; ++hwindex) {
 864                 struct rcar_du_group *rgrp;
 865
 866                 /* Skip unpopulated DU channels. */
 867                 if (!(rcdu->info->channels_mask & BIT(hwindex)))
 868                         continue;
 869
 870                 rgrp = &rcdu->groups[hwindex / 2];
 871
 872                 ret = rcar_du_crtc_create(rgrp, swindex++, hwindex);
 873                 if (ret < 0)
 874                         return ret;
 875         }
 876
 877         /* Initialize the encoders. */
 878         ret = rcar_du_encoders_init(rcdu);
 879         if (ret < 0)
 880                 return ret;
 881
 882         if (ret == 0) {
 883                 dev_err(rcdu->dev, "error: no encoder could be initialized\n");
 884                 return -EINVAL;
 885         }
 886
 887         num_encoders = ret;
 888
 889         /*
 890          * Set the possible CRTCs and possible clones. There's always at least
 891          * one way for all encoders to clone each other, set all bits in the
 892          * possible clones field.
 893          */
 894         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 895                 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 896                 const struct rcar_du_output_routing *route =
 897                         &rcdu->info->routes[renc->output];
 898
 899                 encoder->possible_crtcs = route->possible_crtcs;
 900                 encoder->possible_clones = (1 << num_encoders) - 1;
 901         }
 902
 903         /* Create the writeback connectors. */
 904         if (rcdu->info->gen >= 3) {
 905                 for (i = 0; i < rcdu->num_crtcs; ++i) {
 906                         struct rcar_du_crtc *rcrtc = &rcdu->crtcs[i];
 907
 908                         ret = rcar_du_writeback_init(rcdu, rcrtc);
 909                         if (ret < 0)
 910                                 return ret;
 911                 }
 912         }
 913
 914         /*
 915          * Initialize the default DPAD0 source to the index of the first DU
 916          * channel that can be connected to DPAD0. The exact value doesn't
 917          * matter as it should be overwritten by mode setting for the RGB
 918          * output, but it is nonetheless required to ensure a valid initial
 919          * hardware configuration on Gen3 where DU0 can't always be connected to
 920          * DPAD0.
 921          */
 922         dpad0_sources = rcdu->info->routes[RCAR_DU_OUTPUT_DPAD0].possible_crtcs;
 923         rcdu->dpad0_source = ffs(dpad0_sources) - 1;
 924
 925         drm_mode_config_reset(dev);
 926
 927         drm_kms_helper_poll_init(dev);
 928
 929         return 0;
 930 }