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_crtc.h>
  16 #include <drm/drm_crtc_helper.h>
  17 #include <drm/drm_fb_cma_helper.h>
  18 #include <drm/drm_gem_cma_helper.h>
  19
  20 #include <linux/of_graph.h>
  21
  22 #include "rcar_du_crtc.h"
  23 #include "rcar_du_drv.h"
  24 #include "rcar_du_encoder.h"
  25 #include "rcar_du_kms.h"
  26 #include "rcar_du_lvdsenc.h"
  27 #include "rcar_du_regs.h"
  28
  29 /* -----------------------------------------------------------------------------
  30  * Format helpers
  31  */
  32
  33 static const struct rcar_du_format_info rcar_du_format_infos[] = {
  34         {
  35                 .fourcc = DRM_FORMAT_RGB565,
  36                 .bpp = 16,
  37                 .planes = 1,
  38                 .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
  39                 .edf = PnDDCR4_EDF_NONE,
  40         }, {
  41                 .fourcc = DRM_FORMAT_ARGB1555,
  42                 .bpp = 16,
  43                 .planes = 1,
  44                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
  45                 .edf = PnDDCR4_EDF_NONE,
  46         }, {
  47                 .fourcc = DRM_FORMAT_XRGB1555,
  48                 .bpp = 16,
  49                 .planes = 1,
  50                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
  51                 .edf = PnDDCR4_EDF_NONE,
  52         }, {
  53                 .fourcc = DRM_FORMAT_XRGB8888,
  54                 .bpp = 32,
  55                 .planes = 1,
  56                 .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
  57                 .edf = PnDDCR4_EDF_RGB888,
  58         }, {
  59                 .fourcc = DRM_FORMAT_ARGB8888,
  60                 .bpp = 32,
  61                 .planes = 1,
  62                 .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_16BPP,
  63                 .edf = PnDDCR4_EDF_ARGB8888,
  64         }, {
  65                 .fourcc = DRM_FORMAT_UYVY,
  66                 .bpp = 16,
  67                 .planes = 1,
  68                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  69                 .edf = PnDDCR4_EDF_NONE,
  70         }, {
  71                 .fourcc = DRM_FORMAT_YUYV,
  72                 .bpp = 16,
  73                 .planes = 1,
  74                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  75                 .edf = PnDDCR4_EDF_NONE,
  76         }, {
  77                 .fourcc = DRM_FORMAT_NV12,
  78                 .bpp = 12,
  79                 .planes = 2,
  80                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  81                 .edf = PnDDCR4_EDF_NONE,
  82         }, {
  83                 .fourcc = DRM_FORMAT_NV21,
  84                 .bpp = 12,
  85                 .planes = 2,
  86                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  87                 .edf = PnDDCR4_EDF_NONE,
  88         }, {
  89                 /* In YUV 4:2:2, only NV16 is supported (NV61 isn't) */
  90                 .fourcc = DRM_FORMAT_NV16,
  91                 .bpp = 16,
  92                 .planes = 2,
  93                 .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
  94                 .edf = PnDDCR4_EDF_NONE,
  95         },
  96 };
  97
  98 const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc)
  99 {
 100         unsigned int i;
 101
 102         for (i = 0; i < ARRAY_SIZE(rcar_du_format_infos); ++i) {
 103                 if (rcar_du_format_infos[i].fourcc == fourcc)
 104                         return &rcar_du_format_infos[i];
 105         }
 106
 107         return NULL;
 108 }
 109
 110 /* -----------------------------------------------------------------------------
 111  * Frame buffer
 112  */
 113
 114 int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
 115                         struct drm_mode_create_dumb *args)
 116 {
 117         struct rcar_du_device *rcdu = dev->dev_private;
 118         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 119         unsigned int align;
 120
 121         /* The R8A7779 DU requires a 16 pixels pitch alignment as documented,
 122          * but the R8A7790 DU seems to require a 128 bytes pitch alignment.
 123          */
 124         if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
 125                 align = 128;
 126         else
 127                 align = 16 * args->bpp / 8;
 128
 129         args->pitch = roundup(min_pitch, align);
 130
 131         return drm_gem_cma_dumb_create(file, dev, args);
 132 }
 133
 134 static struct drm_framebuffer *
 135 rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 136                   struct drm_mode_fb_cmd2 *mode_cmd)
 137 {
 138         struct rcar_du_device *rcdu = dev->dev_private;
 139         const struct rcar_du_format_info *format;
 140         unsigned int max_pitch;
 141         unsigned int align;
 142         unsigned int bpp;
 143
 144         format = rcar_du_format_info(mode_cmd->pixel_format);
 145         if (format == NULL) {
 146                 dev_dbg(dev->dev, "unsupported pixel format %08x\n",
 147                         mode_cmd->pixel_format);
 148                 return ERR_PTR(-EINVAL);
 149         }
 150
 151         /*
 152          * The pitch and alignment constraints are expressed in pixels on the
 153          * hardware side and in bytes in the DRM API.
 154          */
 155         bpp = format->planes == 2 ? 1 : format->bpp / 8;
 156         max_pitch =  4096 * bpp;
 157
 158         if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
 159                 align = 128;
 160         else
 161                 align = 16 * bpp;
 162
 163         if (mode_cmd->pitches[0] & (align - 1) ||
 164             mode_cmd->pitches[0] >= max_pitch) {
 165                 dev_dbg(dev->dev, "invalid pitch value %u\n",
 166                         mode_cmd->pitches[0]);
 167                 return ERR_PTR(-EINVAL);
 168         }
 169
 170         if (format->planes == 2) {
 171                 if (mode_cmd->pitches[1] != mode_cmd->pitches[0]) {
 172                         dev_dbg(dev->dev,
 173                                 "luma and chroma pitches do not match\n");
 174                         return ERR_PTR(-EINVAL);
 175                 }
 176         }
 177
 178         return drm_fb_cma_create(dev, file_priv, mode_cmd);
 179 }
 180
 181 static void rcar_du_output_poll_changed(struct drm_device *dev)
 182 {
 183         struct rcar_du_device *rcdu = dev->dev_private;
 184
 185         drm_fbdev_cma_hotplug_event(rcdu->fbdev);
 186 }
 187
 188 static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = {
 189         .fb_create = rcar_du_fb_create,
 190         .output_poll_changed = rcar_du_output_poll_changed,
 191 };
 192
 193 static int rcar_du_encoders_init_pdata(struct rcar_du_device *rcdu)
 194 {
 195         unsigned int num_encoders = 0;
 196         unsigned int i;
 197         int ret;
 198
 199         for (i = 0; i < rcdu->pdata->num_encoders; ++i) {
 200                 const struct rcar_du_encoder_data *pdata =
 201                         &rcdu->pdata->encoders[i];
 202                 const struct rcar_du_output_routing *route =
 203                         &rcdu->info->routes[pdata->output];
 204
 205                 if (pdata->type == RCAR_DU_ENCODER_UNUSED)
 206                         continue;
 207
 208                 if (pdata->output >= RCAR_DU_OUTPUT_MAX ||
 209                     route->possible_crtcs == 0) {
 210                         dev_warn(rcdu->dev,
 211                                  "encoder %u references unexisting output %u, skipping\n",
 212                                  i, pdata->output);
 213                         continue;
 214                 }
 215
 216                 ret = rcar_du_encoder_init(rcdu, pdata->type, pdata->output,
 217                                            pdata, NULL);
 218                 if (ret < 0)
 219                         return ret;
 220
 221                 num_encoders++;
 222         }
 223
 224         return num_encoders;
 225 }
 226
 227 static int rcar_du_encoders_init_dt_one(struct rcar_du_device *rcdu,
 228                                         enum rcar_du_output output,
 229                                         struct of_endpoint *ep)
 230 {
 231         static const struct {
 232                 const char *compatible;
 233                 enum rcar_du_encoder_type type;
 234         } encoders[] = {
 235                 { "adi,adv7123", RCAR_DU_ENCODER_VGA },
 236                 { "thine,thc63lvdm83d", RCAR_DU_ENCODER_LVDS },
 237         };
 238
 239         enum rcar_du_encoder_type enc_type = RCAR_DU_ENCODER_NONE;
 240         struct device_node *connector = NULL;
 241         struct device_node *encoder = NULL;
 242         struct device_node *prev = NULL;
 243         struct device_node *entity_ep_node;
 244         struct device_node *entity;
 245         int ret;
 246
 247         /*
 248          * Locate the connected entity and infer its type from the number of
 249          * endpoints.
 250          */
 251         entity = of_graph_get_remote_port_parent(ep->local_node);
 252         if (!entity) {
 253                 dev_dbg(rcdu->dev, "unconnected endpoint %s, skipping\n",
 254                         ep->local_node->full_name);
 255                 return 0;
 256         }
 257
 258         entity_ep_node = of_parse_phandle(ep->local_node, "remote-endpoint", 0);
 259
 260         while (1) {
 261                 struct device_node *ep_node;
 262
 263                 ep_node = of_graph_get_next_endpoint(entity, prev);
 264                 of_node_put(prev);
 265                 prev = ep_node;
 266
 267                 if (!ep_node)
 268                         break;
 269
 270                 if (ep_node == entity_ep_node)
 271                         continue;
 272
 273                 /*
 274                  * We've found one endpoint other than the input, this must
 275                  * be an encoder. Locate the connector.
 276                  */
 277                 encoder = entity;
 278                 connector = of_graph_get_remote_port_parent(ep_node);
 279                 of_node_put(ep_node);
 280
 281                 if (!connector) {
 282                         dev_warn(rcdu->dev,
 283                                  "no connector for encoder %s, skipping\n",
 284                                  encoder->full_name);
 285                         of_node_put(entity_ep_node);
 286                         of_node_put(encoder);
 287                         return 0;
 288                 }
 289
 290                 break;
 291         }
 292
 293         of_node_put(entity_ep_node);
 294
 295         if (encoder) {
 296                 /*
 297                  * If an encoder has been found, get its type based on its
 298                  * compatible string.
 299                  */
 300                 unsigned int i;
 301
 302                 for (i = 0; i < ARRAY_SIZE(encoders); ++i) {
 303                         if (of_device_is_compatible(encoder,
 304                                                     encoders[i].compatible)) {
 305                                 enc_type = encoders[i].type;
 306                                 break;
 307                         }
 308                 }
 309
 310                 if (i == ARRAY_SIZE(encoders)) {
 311                         dev_warn(rcdu->dev,
 312                                  "unknown encoder type for %s, skipping\n",
 313                                  encoder->full_name);
 314                         of_node_put(encoder);
 315                         of_node_put(connector);
 316                         return 0;
 317                 }
 318         } else {
 319                 /*
 320                  * If no encoder has been found the entity must be the
 321                  * connector.
 322                  */
 323                 connector = entity;
 324         }
 325
 326         ret = rcar_du_encoder_init(rcdu, enc_type, output, NULL, connector);
 327         of_node_put(encoder);
 328         of_node_put(connector);
 329
 330         return ret < 0 ? ret : 1;
 331 }
 332
 333 static int rcar_du_encoders_init_dt(struct rcar_du_device *rcdu)
 334 {
 335         struct device_node *np = rcdu->dev->of_node;
 336         struct device_node *prev = NULL;
 337         unsigned int num_encoders = 0;
 338
 339         /*
 340          * Iterate over the endpoints and create one encoder for each output
 341          * pipeline.
 342          */
 343         while (1) {
 344                 struct device_node *ep_node;
 345                 enum rcar_du_output output;
 346                 struct of_endpoint ep;
 347                 unsigned int i;
 348                 int ret;
 349
 350                 ep_node = of_graph_get_next_endpoint(np, prev);
 351                 of_node_put(prev);
 352                 prev = ep_node;
 353
 354                 if (ep_node == NULL)
 355                         break;
 356
 357                 ret = of_graph_parse_endpoint(ep_node, &ep);
 358                 if (ret < 0) {
 359                         of_node_put(ep_node);
 360                         return ret;
 361                 }
 362
 363                 /* Find the output route corresponding to the port number. */
 364                 for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
 365                         if (rcdu->info->routes[i].possible_crtcs &&
 366                             rcdu->info->routes[i].port == ep.port) {
 367                                 output = i;
 368                                 break;
 369                         }
 370                 }
 371
 372                 if (i == RCAR_DU_OUTPUT_MAX) {
 373                         dev_warn(rcdu->dev,
 374                                  "port %u references unexisting output, skipping\n",
 375                                  ep.port);
 376                         continue;
 377                 }
 378
 379                 /* Process the output pipeline. */
 380                 ret = rcar_du_encoders_init_dt_one(rcdu, output, &ep);
 381                 if (ret < 0) {
 382                         of_node_put(ep_node);
 383                         return ret;
 384                 }
 385
 386                 num_encoders += ret;
 387         }
 388
 389         return num_encoders;
 390 }
 391
 392 int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 393 {
 394         static const unsigned int mmio_offsets[] = {
 395                 DU0_REG_OFFSET, DU2_REG_OFFSET
 396         };
 397
 398         struct drm_device *dev = rcdu->ddev;
 399         struct drm_encoder *encoder;
 400         struct drm_fbdev_cma *fbdev;
 401         unsigned int num_encoders;
 402         unsigned int num_groups;
 403         unsigned int i;
 404         int ret;
 405
 406         drm_mode_config_init(dev);
 407
 408         dev->mode_config.min_width = 0;
 409         dev->mode_config.min_height = 0;
 410         dev->mode_config.max_width = 4095;
 411         dev->mode_config.max_height = 2047;
 412         dev->mode_config.funcs = &rcar_du_mode_config_funcs;
 413
 414         rcdu->num_crtcs = rcdu->info->num_crtcs;
 415
 416         /* Initialize the groups. */
 417         num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);
 418
 419         for (i = 0; i < num_groups; ++i) {
 420                 struct rcar_du_group *rgrp = &rcdu->groups[i];
 421
 422                 rgrp->dev = rcdu;
 423                 rgrp->mmio_offset = mmio_offsets[i];
 424                 rgrp->index = i;
 425
 426                 ret = rcar_du_planes_init(rgrp);
 427                 if (ret < 0)
 428                         return ret;
 429         }
 430
 431         /* Create the CRTCs. */
 432         for (i = 0; i < rcdu->num_crtcs; ++i) {
 433                 struct rcar_du_group *rgrp = &rcdu->groups[i / 2];
 434
 435                 ret = rcar_du_crtc_create(rgrp, i);
 436                 if (ret < 0)
 437                         return ret;
 438         }
 439
 440         /* Initialize the encoders. */
 441         ret = rcar_du_lvdsenc_init(rcdu);
 442         if (ret < 0)
 443                 return ret;
 444
 445         if (rcdu->pdata)
 446                 ret = rcar_du_encoders_init_pdata(rcdu);
 447         else
 448                 ret = rcar_du_encoders_init_dt(rcdu);
 449
 450         if (ret < 0)
 451                 return ret;
 452
 453         num_encoders = ret;
 454
 455         /* Set the possible CRTCs and possible clones. There's always at least
 456          * one way for all encoders to clone each other, set all bits in the
 457          * possible clones field.
 458          */
 459         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 460                 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 461                 const struct rcar_du_output_routing *route =
 462                         &rcdu->info->routes[renc->output];
 463
 464                 encoder->possible_crtcs = route->possible_crtcs;
 465                 encoder->possible_clones = (1 << num_encoders) - 1;
 466         }
 467
 468         /* Now that the CRTCs have been initialized register the planes. */
 469         for (i = 0; i < num_groups; ++i) {
 470                 ret = rcar_du_planes_register(&rcdu->groups[i]);
 471                 if (ret < 0)
 472                         return ret;
 473         }
 474
 475         drm_kms_helper_poll_init(dev);
 476
 477         drm_helper_disable_unused_functions(dev);
 478
 479         fbdev = drm_fbdev_cma_init(dev, 32, dev->mode_config.num_crtc,
 480                                    dev->mode_config.num_connector);
 481         if (IS_ERR(fbdev))
 482                 return PTR_ERR(fbdev);
 483
 484 #ifndef CONFIG_FRAMEBUFFER_CONSOLE
 485         drm_fbdev_cma_restore_mode(fbdev);
 486 #endif
 487
 488         rcdu->fbdev = fbdev;
 489
 490         return 0;
 491 }