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_internal(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_one(struct rcar_du_device *rcdu,
 194                                      enum rcar_du_output output,
 195                                      struct of_endpoint *ep)
 196 {
 197         static const struct {
 198                 const char *compatible;
 199                 enum rcar_du_encoder_type type;
 200         } encoders[] = {
 201                 { "adi,adv7123", RCAR_DU_ENCODER_VGA },
 202                 { "thine,thc63lvdm83d", RCAR_DU_ENCODER_LVDS },
 203         };
 204
 205         enum rcar_du_encoder_type enc_type = RCAR_DU_ENCODER_NONE;
 206         struct device_node *connector = NULL;
 207         struct device_node *encoder = NULL;
 208         struct device_node *prev = NULL;
 209         struct device_node *entity_ep_node;
 210         struct device_node *entity;
 211         int ret;
 212
 213         /*
 214          * Locate the connected entity and infer its type from the number of
 215          * endpoints.
 216          */
 217         entity = of_graph_get_remote_port_parent(ep->local_node);
 218         if (!entity) {
 219                 dev_dbg(rcdu->dev, "unconnected endpoint %s, skipping\n",
 220                         ep->local_node->full_name);
 221                 return 0;
 222         }
 223
 224         entity_ep_node = of_parse_phandle(ep->local_node, "remote-endpoint", 0);
 225
 226         while (1) {
 227                 struct device_node *ep_node;
 228
 229                 ep_node = of_graph_get_next_endpoint(entity, prev);
 230                 of_node_put(prev);
 231                 prev = ep_node;
 232
 233                 if (!ep_node)
 234                         break;
 235
 236                 if (ep_node == entity_ep_node)
 237                         continue;
 238
 239                 /*
 240                  * We've found one endpoint other than the input, this must
 241                  * be an encoder. Locate the connector.
 242                  */
 243                 encoder = entity;
 244                 connector = of_graph_get_remote_port_parent(ep_node);
 245                 of_node_put(ep_node);
 246
 247                 if (!connector) {
 248                         dev_warn(rcdu->dev,
 249                                  "no connector for encoder %s, skipping\n",
 250                                  encoder->full_name);
 251                         of_node_put(entity_ep_node);
 252                         of_node_put(encoder);
 253                         return 0;
 254                 }
 255
 256                 break;
 257         }
 258
 259         of_node_put(entity_ep_node);
 260
 261         if (encoder) {
 262                 /*
 263                  * If an encoder has been found, get its type based on its
 264                  * compatible string.
 265                  */
 266                 unsigned int i;
 267
 268                 for (i = 0; i < ARRAY_SIZE(encoders); ++i) {
 269                         if (of_device_is_compatible(encoder,
 270                                                     encoders[i].compatible)) {
 271                                 enc_type = encoders[i].type;
 272                                 break;
 273                         }
 274                 }
 275
 276                 if (i == ARRAY_SIZE(encoders)) {
 277                         dev_warn(rcdu->dev,
 278                                  "unknown encoder type for %s, skipping\n",
 279                                  encoder->full_name);
 280                         of_node_put(encoder);
 281                         of_node_put(connector);
 282                         return 0;
 283                 }
 284         } else {
 285                 /*
 286                  * If no encoder has been found the entity must be the
 287                  * connector.
 288                  */
 289                 connector = entity;
 290         }
 291
 292         ret = rcar_du_encoder_init(rcdu, enc_type, output, encoder, connector);
 293         of_node_put(encoder);
 294         of_node_put(connector);
 295
 296         return ret < 0 ? ret : 1;
 297 }
 298
 299 static int rcar_du_encoders_init(struct rcar_du_device *rcdu)
 300 {
 301         struct device_node *np = rcdu->dev->of_node;
 302         struct device_node *prev = NULL;
 303         unsigned int num_encoders = 0;
 304
 305         /*
 306          * Iterate over the endpoints and create one encoder for each output
 307          * pipeline.
 308          */
 309         while (1) {
 310                 struct device_node *ep_node;
 311                 enum rcar_du_output output;
 312                 struct of_endpoint ep;
 313                 unsigned int i;
 314                 int ret;
 315
 316                 ep_node = of_graph_get_next_endpoint(np, prev);
 317                 of_node_put(prev);
 318                 prev = ep_node;
 319
 320                 if (ep_node == NULL)
 321                         break;
 322
 323                 ret = of_graph_parse_endpoint(ep_node, &ep);
 324                 if (ret < 0) {
 325                         of_node_put(ep_node);
 326                         return ret;
 327                 }
 328
 329                 /* Find the output route corresponding to the port number. */
 330                 for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) {
 331                         if (rcdu->info->routes[i].possible_crtcs &&
 332                             rcdu->info->routes[i].port == ep.port) {
 333                                 output = i;
 334                                 break;
 335                         }
 336                 }
 337
 338                 if (i == RCAR_DU_OUTPUT_MAX) {
 339                         dev_warn(rcdu->dev,
 340                                  "port %u references unexisting output, skipping\n",
 341                                  ep.port);
 342                         continue;
 343                 }
 344
 345                 /* Process the output pipeline. */
 346                 ret = rcar_du_encoders_init_one(rcdu, output, &ep);
 347                 if (ret < 0) {
 348                         of_node_put(ep_node);
 349                         return ret;
 350                 }
 351
 352                 num_encoders += ret;
 353         }
 354
 355         return num_encoders;
 356 }
 357
 358 int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 359 {
 360         static const unsigned int mmio_offsets[] = {
 361                 DU0_REG_OFFSET, DU2_REG_OFFSET
 362         };
 363
 364         struct drm_device *dev = rcdu->ddev;
 365         struct drm_encoder *encoder;
 366         struct drm_fbdev_cma *fbdev;
 367         unsigned int num_encoders;
 368         unsigned int num_groups;
 369         unsigned int i;
 370         int ret;
 371
 372         drm_mode_config_init(dev);
 373
 374         dev->mode_config.min_width = 0;
 375         dev->mode_config.min_height = 0;
 376         dev->mode_config.max_width = 4095;
 377         dev->mode_config.max_height = 2047;
 378         dev->mode_config.funcs = &rcar_du_mode_config_funcs;
 379
 380         rcdu->num_crtcs = rcdu->info->num_crtcs;
 381
 382         /* Initialize the groups. */
 383         num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);
 384
 385         for (i = 0; i < num_groups; ++i) {
 386                 struct rcar_du_group *rgrp = &rcdu->groups[i];
 387
 388                 rgrp->dev = rcdu;
 389                 rgrp->mmio_offset = mmio_offsets[i];
 390                 rgrp->index = i;
 391
 392                 ret = rcar_du_planes_init(rgrp);
 393                 if (ret < 0)
 394                         return ret;
 395         }
 396
 397         /* Create the CRTCs. */
 398         for (i = 0; i < rcdu->num_crtcs; ++i) {
 399                 struct rcar_du_group *rgrp = &rcdu->groups[i / 2];
 400
 401                 ret = rcar_du_crtc_create(rgrp, i);
 402                 if (ret < 0)
 403                         return ret;
 404         }
 405
 406         /* Initialize the encoders. */
 407         ret = rcar_du_lvdsenc_init(rcdu);
 408         if (ret < 0)
 409                 return ret;
 410
 411         ret = rcar_du_encoders_init(rcdu);
 412         if (ret < 0)
 413                 return ret;
 414
 415         num_encoders = ret;
 416
 417         /* Set the possible CRTCs and possible clones. There's always at least
 418          * one way for all encoders to clone each other, set all bits in the
 419          * possible clones field.
 420          */
 421         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 422                 struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 423                 const struct rcar_du_output_routing *route =
 424                         &rcdu->info->routes[renc->output];
 425
 426                 encoder->possible_crtcs = route->possible_crtcs;
 427                 encoder->possible_clones = (1 << num_encoders) - 1;
 428         }
 429
 430         /* Now that the CRTCs have been initialized register the planes. */
 431         for (i = 0; i < num_groups; ++i) {
 432                 ret = rcar_du_planes_register(&rcdu->groups[i]);
 433                 if (ret < 0)
 434                         return ret;
 435         }
 436
 437         drm_kms_helper_poll_init(dev);
 438
 439         drm_helper_disable_unused_functions(dev);
 440
 441         fbdev = drm_fbdev_cma_init(dev, 32, dev->mode_config.num_crtc,
 442                                    dev->mode_config.num_connector);
 443         if (IS_ERR(fbdev))
 444                 return PTR_ERR(fbdev);
 445
 446 #ifndef CONFIG_FRAMEBUFFER_CONSOLE
 447         drm_fbdev_cma_restore_mode(fbdev);
 448 #endif
 449
 450         rcdu->fbdev = fbdev;
 451
 452         return 0;
 453 }