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

   1 /*
   2  * rcar_du_kms.c  --  R-Car Display Unit Mode Setting
   3  *
   4  * Copyright (C) 2013-2014 Renesas Electronics Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <drm/drmP.h>
  15 #include <drm/drm_atomic.h>
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_crtc.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_fb_cma_helper.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21
  22 #include <linux/of_graph.h>
  23 #include <linux/wait.h>
  24
  25 #include "rcar_du_crtc.h"
  26 #include "rcar_du_drv.h"
  27 #include "rcar_du_encoder.h"
  28 #include "rcar_du_kms.h"
  29 #include "rcar_du_lvdsenc.h"
  30 #include "rcar_du_regs.h"
  31
  32 /* -----------------------------------------------------------------------------
  33  * Format helpers
  34  */
  35
  36 static const struct rcar_du_format_info rcar_du_format_infos[] = {
  37         {
  38                 .fourcc = DRM_FORMAT_RGB565,
  39                 .bpp = 16,
  40                 .planes = 1,
  41                 .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
  42                 .edf = PnDDCR4_EDF_NONE,
  43         }, {
  44                 .fourcc = DRM_FORMAT_ARGB1555,
  45                 .bpp = 16,
  46                 .planes = 1,
  47                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
  48                 .edf = PnDDCR4_EDF_NONE,
  49         }, {
  50                 .fourcc = DRM_FORMAT_XRGB1555,
  51                 .bpp = 16,
  52                 .planes = 1,
  53                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
  54                 .edf = PnDDCR4_EDF_NONE,
  55         }, {
  56                 .fourcc = DRM_FORMAT_XRGB8888,
  57                 .bpp = 32,
  58                 .planes = 1,
  59                 .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
  60                 .edf = PnDDCR4_EDF_RGB888,
  61         }, {
  62                 .fourcc = DRM_FORMAT_ARGB8888,
  63                 .bpp = 32,
  64                 .planes = 1,
  65                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_16BPP,
  66                 .edf = PnDDCR4_EDF_ARGB8888,
  67         }, {
  68                 .fourcc = DRM_FORMAT_UYVY,
  69                 .bpp = 16,
  70                 .planes = 1,
  71                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  72                 .edf = PnDDCR4_EDF_NONE,
  73         }, {
  74                 .fourcc = DRM_FORMAT_YUYV,
  75                 .bpp = 16,
  76                 .planes = 1,
  77                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  78                 .edf = PnDDCR4_EDF_NONE,
  79         }, {
  80                 .fourcc = DRM_FORMAT_NV12,
  81                 .bpp = 12,
  82                 .planes = 2,
  83                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  84                 .edf = PnDDCR4_EDF_NONE,
  85         }, {
  86                 .fourcc = DRM_FORMAT_NV21,
  87                 .bpp = 12,
  88                 .planes = 2,
  89                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  90                 .edf = PnDDCR4_EDF_NONE,
  91         }, {
  92                 /* In YUV 4:2:2, only NV16 is supported (NV61 isn't) */
  93                 .fourcc = DRM_FORMAT_NV16,
  94                 .bpp = 16,
  95                 .planes = 2,
  96                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  97                 .edf = PnDDCR4_EDF_NONE,
  98         },
  99 };
 100
 101 const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc)
 102 {
 103         unsigned int i;
 104
 105         for (i = 0; i < ARRAY_SIZE(rcar_du_format_infos); ++i) {
 106                 if (rcar_du_format_infos[i].fourcc == fourcc)
 107                         return &rcar_du_format_infos[i];
 108         }
 109
 110         return NULL;
 111 }
 112
 113 /* -----------------------------------------------------------------------------
 114  * Frame buffer
 115  */
 116
 117 int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
 118                         struct drm_mode_create_dumb *args)
 119 {
 120         struct rcar_du_device *rcdu = dev->dev_private;
 121         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 122         unsigned int align;
 123
 124         /* The R8A7779 DU requires a 16 pixels pitch alignment as documented,
 125          * but the R8A7790 DU seems to require a 128 bytes pitch alignment.
 126          */
 127         if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
 128                 align = 128;
 129         else
 130                 align = 16 * args->bpp / 8;
 131
 132         args->pitch = roundup(min_pitch, align);
 133
 134         return drm_gem_cma_dumb_create_internal(file, dev, args);
 135 }
 136
 137 static struct drm_framebuffer *
 138 rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 139                   const struct drm_mode_fb_cmd2 *mode_cmd)
 140 {
 141         struct rcar_du_device *rcdu = dev->dev_private;
 142         const struct rcar_du_format_info *format;
 143         unsigned int max_pitch;
 144         unsigned int align;
 145         unsigned int bpp;
 146
 147         format = rcar_du_format_info(mode_cmd->pixel_format);
 148         if (format == NULL) {
 149                 dev_dbg(dev->dev, "unsupported pixel format %08x\n",
 150                         mode_cmd->pixel_format);
 151                 return ERR_PTR(-EINVAL);
 152         }
 153
 154         /*
 155          * The pitch and alignment constraints are expressed in pixels on the
 156          * hardware side and in bytes in the DRM API.
 157          */
 158         bpp = format->planes == 2 ? 1 : format->bpp / 8;
 159         max_pitch =  4096 * bpp;
 160
 161         if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
 162                 align = 128;
 163         else
 164                 align = 16 * bpp;
 165
 166         if (mode_cmd->pitches[0] & (align - 1) ||
 167             mode_cmd->pitches[0] >= max_pitch) {
 168                 dev_dbg(dev->dev, "invalid pitch value %u\n",
 169                         mode_cmd->pitches[0]);
 170                 return ERR_PTR(-EINVAL);
 171         }
 172
 173         if (format->planes == 2) {
 174                 if (mode_cmd->pitches[1] != mode_cmd->pitches[0]) {
 175                         dev_dbg(dev->dev,
 176                                 "luma and chroma pitches do not match\n");
 177                         return ERR_PTR(-EINVAL);
 178                 }
 179         }
 180
 181         return drm_fb_cma_create(dev, file_priv, mode_cmd);
 182 }
 183
 184 static void rcar_du_output_poll_changed(struct drm_device *dev)
 185 {
 186         struct rcar_du_device *rcdu = dev->dev_private;
 187
 188         drm_fbdev_cma_hotplug_event(rcdu->fbdev);
 189 }
 190
 191 /* -----------------------------------------------------------------------------
 192  * Atomic Check and Update
 193  */
 194
 195 static int rcar_du_atomic_check(struct drm_device *dev,
 196                                 struct drm_atomic_state *state)
 197 {
 198         int ret;
 199
 200         ret = drm_atomic_helper_check(dev, state);
 201         if (ret < 0)
 202                 return ret;
 203
 204         return rcar_du_atomic_check_planes(dev, state);
 205 }
 206
 207 struct rcar_du_commit {
 208         struct work_struct work;
 209         struct drm_device *dev;
 210         struct drm_atomic_state *state;
 211         u32 crtcs;
 212 };
 213
 214 static void rcar_du_atomic_complete(struct rcar_du_commit *commit)
 215 {
 216         struct drm_device *dev = commit->dev;
 217         struct rcar_du_device *rcdu = dev->dev_private;
 218         struct drm_atomic_state *old_state = commit->state;
 219
 220         /* Apply the atomic update. */
 221         drm_atomic_helper_commit_modeset_disables(dev, old_state);
 222         drm_atomic_helper_commit_modeset_enables(dev, old_state);
 223         drm_atomic_helper_commit_planes(dev, old_state, true);
 224
 225         drm_atomic_helper_wait_for_vblanks(dev, old_state);
 226
 227         drm_atomic_helper_cleanup_planes(dev, old_state);
 228
 229         drm_atomic_state_free(old_state);
 230
 231         /* Complete the commit, wake up any waiter. */
 232         spin_lock(&rcdu->commit.wait.lock);
 233         rcdu->commit.pending &= ~commit->crtcs;
 234         wake_up_all_locked(&rcdu->commit.wait);
 235         spin_unlock(&rcdu->commit.wait.lock);
 236
 237         kfree(commit);
 238 }
 239
 240 static void rcar_du_atomic_work(struct work_struct *work)
 241 {
 242         struct rcar_du_commit *commit =
 243                 container_of(work, struct rcar_du_commit, work);
 244
 245         rcar_du_atomic_complete(commit);
 246 }
 247
 248 static int rcar_du_atomic_commit(struct drm_device *dev,
 249                                  struct drm_atomic_state *state, bool async)
 250 {
 251         struct rcar_du_device *rcdu = dev->dev_private;
 252         struct rcar_du_commit *commit;
 253         unsigned int i;
 254         int ret;
 255
 256         ret = drm_atomic_helper_prepare_planes(dev, state);
 257         if (ret)
 258                 return ret;
 259
 260         /* Allocate the commit object. */
 261         commit = kzalloc(sizeof(*commit), GFP_KERNEL);
 262         if (commit == NULL) {
 263                 ret = -ENOMEM;
 264                 goto error;
 265         }
 266
 267         INIT_WORK(&commit->work, rcar_du_atomic_work);
 268         commit->dev = dev;
 269         commit->state = state;
 270
 271         /* Wait until all affected CRTCs have completed previous commits and
 272          * mark them as pending.
 273          */
 274         for (i = 0; i < dev->mode_config.num_crtc; ++i) {
 275                 if (state->crtcs[i])
 276                         commit->crtcs |= 1 << drm_crtc_index(state->crtcs[i]);
 277         }
 278
 279         spin_lock(&rcdu->commit.wait.lock);
 280         ret = wait_event_interruptible_locked(rcdu->commit.wait,
 281                         !(rcdu->commit.pending & commit->crtcs));
 282         if (ret == 0)
 283                 rcdu->commit.pending |= commit->crtcs;
 284         spin_unlock(&rcdu->commit.wait.lock);
 285
 286         if (ret) {
 287                 kfree(commit);
 288                 goto error;
 289         }
 290
 291         /* Swap the state, this is the point of no return. */
 292         drm_atomic_helper_swap_state(dev, state);
 293
 294         if (async)
 295                 schedule_work(&commit->work);
 296         else
 297                 rcar_du_atomic_complete(commit);
 298
 299         return 0;
 300
 301 error:
 302         drm_atomic_helper_cleanup_planes(dev, state);
 303         return ret;
 304 }
 305
 306 /* -----------------------------------------------------------------------------
 307  * Initialization
 308  */
 309
 310 static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = {
 311         .fb_create = rcar_du_fb_create,
 312         .output_poll_changed = rcar_du_output_poll_changed,
 313         .atomic_check = rcar_du_atomic_check,
 314         .atomic_commit = rcar_du_atomic_commit,
 315 };
 316
 317 static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
 318                                      enum rcar_du_output output,
 319                                      struct of_endpoint *ep)
 320 {
 321         static const struct {
 322                 const char *compatible;
 323                 enum rcar_du_encoder_type type;
 324         } encoders[] = {
 325                 { "adi,adv7123", RCAR_DU_ENCODER_VGA },
 326                 { "adi,adv7511w", RCAR_DU_ENCODER_HDMI },
 327                 { "thine,thc63lvdm83d", RCAR_DU_ENCODER_LVDS },
 328         };
 329
 330         enum rcar_du_encoder_type enc_type = RCAR_DU_ENCODER_NONE;
 331         struct device_node *connector = NULL;
 332         struct device_node *encoder = NULL;
 333         struct device_node *ep_node = NULL;
 334         struct device_node *entity_ep_node;
 335         struct device_node *entity;
 336         int ret;
 337
 338         /*
 339          * Locate the connected entity and infer its type from the number of
 340          * endpoints.
 341          */
 342         entity = of_graph_get_remote_port_parent(ep->local_node);
 343         if (!entity) {
 344                 dev_dbg(rcdu->dev, "unconnected endpoint %s, skipping\n",
 345                         ep->local_node->full_name);
 346                 return -ENODEV;
 347         }
 348
 349         entity_ep_node = of_parse_phandle(ep->local_node, "remote-endpoint", 0);
 350
 351         for_each_endpoint_of_node(entity, ep_node) {
 352                 if (ep_node == entity_ep_node)
 353                         continue;
 354
 355                 /*
 356                  * We've found one endpoint other than the input, this must
 357                  * be an encoder. Locate the connector.
 358                  */
 359                 encoder = entity;
 360                 connector = of_graph_get_remote_port_parent(ep_node);
 361                 of_node_put(ep_node);
 362
 363                 if (!connector) {
 364                         dev_warn(rcdu->dev,
 365                                  "no connector for encoder %s, skipping\n",
 366                                  encoder->full_name);
 367                         of_node_put(entity_ep_node);
 368                         of_node_put(encoder);
 369                         return -ENODEV;
 370                 }
 371
 372                 break;
 373         }
 374
 375         of_node_put(entity_ep_node);
 376
 377         if (encoder) {
 378                 /*
 379                  * If an encoder has been found, get its type based on its
 380                  * compatible string.
 381                  */
 382                 unsigned int i;
 383
 384                 for (i = 0; i < ARRAY_SIZE(encoders); ++i) {
 385                         if (of_device_is_compatible(encoder,
 386                                                     encoders[i].compatible)) {
 387                                 enc_type = encoders[i].type;
 388                                 break;
 389                         }
 390                 }
 391
 392                 if (i == ARRAY_SIZE(encoders)) {
 393                         dev_warn(rcdu->dev,
 394                                  "unknown encoder type for %s, skipping\n",
 395                                  encoder->full_name);
 396                         of_node_put(encoder);
 397                         of_node_put(connector);
 398                         return -EINVAL;
 399                 }
 400         } else {
 401                 /*
 402                  * If no encoder has been found the entity must be the
 403                  * connector.
 404                  */
 405                 connector = entity;
 406         }
 407
 408         ret = rcar_du_encoder_init(rcdu, enc_type, output, encoder, connector);
 409         of_node_put(encoder);
 410         of_node_put(connector);
 411
 412         if (ret && ret != -EPROBE_DEFER)
 413                 dev_warn(rcdu->dev,
 414                          "failed to initialize encoder %s (%d), skipping\n",
 415                          encoder->full_name, ret);
 416
 417         return ret;
 418 }
 419
 420 static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
 421 {
 422         struct device_node *np = rcdu->dev->of_node;
 423         struct device_node *ep_node;
 424         unsigned int num_encoders = 0;
 425
 426         /*
 427          * Iterate over the endpoints and create one encoder for each output
 428          * pipeline.
 429          */
 430         for_each_endpoint_of_node(np, ep_node) {
 431                 enum rcar_du_output output;
 432                 struct of_endpoint ep;
 433                 unsigned int i;
 434                 int ret;
 435
 436                 ret = of_graph_parse_endpoint(ep_node, &ep);
 437                 if (ret < 0) {
 438                         of_node_put(ep_node);
 439                         return ret;
 440                 }
 441
 442                 /* Find the output route corresponding to the port number. */
 443                 for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
 444                         if (rcdu->info->routes[i].possible_crtcs &&
 445                             rcdu->info->routes[i].port == ep.port) {
 446                                 output = i;
 447                                 break;
 448                         }
 449                 }
 450
 451                 if (i == RCAR_DU_OUTPUT_MAX) {
 452                         dev_warn(rcdu->dev,
 453                                  "port %u references unexisting output, skipping\n",
 454                                  ep.port);
 455                         continue;
 456                 }
 457
 458                 /* Process the output pipeline. */
 459                 ret = rcar_du_encoders_init_one(rcdu, output, &ep);
 460                 if (ret < 0) {
 461                         if (ret == -EPROBE_DEFER) {
 462                                 of_node_put(ep_node);
 463                                 return ret;
 464                         }
 465
 466                         continue;
 467                 }
 468
 469                 num_encoders++;
 470         }
 471
 472         return num_encoders;
 473 }
 474
 475 static int rcar_du_properties_init(struct rcar_du_device *rcdu)
 476 {
 477         rcdu->props.alpha =
 478                 drm_property_create_range(rcdu->ddev, 0, "alpha", 0, 255);
 479         if (rcdu->props.alpha == NULL)
 480                 return -ENOMEM;
 481
 482         /* The color key is expressed as an RGB888 triplet stored in a 32-bit
 483          * integer in XRGB8888 format. Bit 24 is used as a flag to disable (0)
 484          * or enable source color keying (1).
 485          */
 486         rcdu->props.colorkey =
 487                 drm_property_create_range(rcdu->ddev, 0, "colorkey",
 488                                           0, 0x01ffffff);
 489         if (rcdu->props.colorkey == NULL)
 490                 return -ENOMEM;
 491
 492         rcdu->props.zpos =
 493                 drm_property_create_range(rcdu->ddev, 0, "zpos", 1, 7);
 494         if (rcdu->props.zpos == NULL)
 495                 return -ENOMEM;
 496
 497         return 0;
 498 }
 499
 500 int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 501 {
 502         static const unsigned int mmio_offsets[] = {
 503                 DU0_REG_OFFSET, DU2_REG_OFFSET
 504         };
 505
 506         struct drm_device *dev = rcdu->ddev;
 507         struct drm_encoder *encoder;
 508         struct drm_fbdev_cma *fbdev;
 509         unsigned int num_encoders;
 510         unsigned int num_groups;
 511         unsigned int i;
 512         int ret;
 513
 514         drm_mode_config_init(dev);
 515
 516         dev->mode_config.min_width = 0;
 517         dev->mode_config.min_height = 0;
 518         dev->mode_config.max_width = 4095;
 519         dev->mode_config.max_height = 2047;
 520         dev->mode_config.funcs = &rcar_du_mode_config_funcs;
 521
 522         rcdu->num_crtcs = rcdu->info->num_crtcs;
 523
 524         ret = rcar_du_properties_init(rcdu);
 525         if (ret < 0)
 526                 return ret;
 527
 528         /* Initialize the groups. */
 529         num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);
 530
 531         for (i = 0; i < num_groups; ++i) {
 532                 struct rcar_du_group *rgrp = &rcdu->groups[i];
 533
 534                 mutex_init(&rgrp->lock);
 535
 536                 rgrp->dev = rcdu;
 537                 rgrp->mmio_offset = mmio_offsets[i];
 538                 rgrp->index = i;
 539                 rgrp->num_crtcs = min(rcdu->num_crtcs - 2 * i, 2U);
 540
 541                 /* If we have more than one CRTCs in this group pre-associate
 542                  * planes 0-3 with CRTC 0 and planes 4-7 with CRTC 1 to minimize
 543                  * flicker occurring when the association is changed.
 544                  */
 545                 rgrp->dptsr_planes = rgrp->num_crtcs > 1 ? 0xf0 : 0;
 546
 547                 ret = rcar_du_planes_init(rgrp);
 548                 if (ret < 0)
 549                         return ret;
 550         }
 551
 552         /* Create the CRTCs. */
 553         for (i = 0; i < rcdu->num_crtcs; ++i) {
 554                 struct rcar_du_group *rgrp = &rcdu->groups[i / 2];
 555
 556                 ret = rcar_du_crtc_create(rgrp, i);
 557                 if (ret < 0)
 558                         return ret;
 559         }
 560
 561         /* Initialize the encoders. */
 562         ret = rcar_du_lvdsenc_init(rcdu);
 563         if (ret < 0)
 564                 return ret;
 565
 566         ret = rcar_du_encoders_init(rcdu);
 567         if (ret < 0)
 568                 return ret;
 569
 570         if (ret == 0) {
 571                 dev_err(rcdu->dev, "error: no encoder could be initialized\n");
 572                 return -EINVAL;
 573         }
 574
 575         num_encoders = ret;
 576
 577         /* Set the possible CRTCs and possible clones. There's always at least
 578          * one way for all encoders to clone each other, set all bits in the
 579          * possible clones field.
 580          */
 581         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 582                 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 583                 const struct rcar_du_output_routing *route =
 584                         &rcdu->info->routes[renc->output];
 585
 586                 encoder->possible_crtcs = route->possible_crtcs;
 587                 encoder->possible_clones = (1 << num_encoders) - 1;
 588         }
 589
 590         drm_mode_config_reset(dev);
 591
 592         drm_kms_helper_poll_init(dev);
 593
 594         if (dev->mode_config.num_connector) {
 595                 fbdev = drm_fbdev_cma_init(dev, 32, dev->mode_config.num_crtc,
 596                                            dev->mode_config.num_connector);
 597                 if (IS_ERR(fbdev))
 598                         return PTR_ERR(fbdev);
 599
 600                 rcdu->fbdev = fbdev;
 601         } else {
 602                 dev_info(rcdu->dev,
 603                          "no connector found, disabling fbdev emulation\n");
 604         }
 605
 606         return 0;
 607 }