drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 /*
   4  * Copyright 2020 NXP
   5  */
   6
   7 #include <linux/clk.h>
   8 #include <linux/media-bus-format.h>
   9 #include <linux/mfd/syscon.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/of_device.h>
  13 #include <linux/of_graph.h>
  14 #include <linux/phy/phy.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/regmap.h>
  18
  19 #include <drm/drm_atomic_state_helper.h>
  20 #include <drm/drm_bridge.h>
  21 #include <drm/drm_connector.h>
  22 #include <drm/drm_fourcc.h>
  23 #include <drm/drm_of.h>
  24 #include <drm/drm_print.h>
  25
  26 #include "imx-ldb-helper.h"
  27
  28 #define  LDB_CH_SEL             BIT(28)
  29
  30 #define SS_CTRL                 0x20
  31 #define  CH_HSYNC_M(id)         BIT(0 + ((id) * 2))
  32 #define  CH_VSYNC_M(id)         BIT(1 + ((id) * 2))
  33 #define  CH_PHSYNC(id)          BIT(0 + ((id) * 2))
  34 #define  CH_PVSYNC(id)          BIT(1 + ((id) * 2))
  35
  36 #define DRIVER_NAME             "imx8qxp-ldb"
  37
  38 struct imx8qxp_ldb_channel {
  39         struct ldb_channel base;
  40         struct phy *phy;
  41         unsigned int di_id;
  42 };
  43
  44 struct imx8qxp_ldb {
  45         struct ldb base;
  46         struct device *dev;
  47         struct imx8qxp_ldb_channel channel[MAX_LDB_CHAN_NUM];
  48         struct clk *clk_pixel;
  49         struct clk *clk_bypass;
  50         struct drm_bridge *companion;
  51         int active_chno;
  52 };
  53
  54 static inline struct imx8qxp_ldb_channel *
  55 base_to_imx8qxp_ldb_channel(struct ldb_channel *base)
  56 {
  57         return container_of(base, struct imx8qxp_ldb_channel, base);
  58 }
  59
  60 static inline struct imx8qxp_ldb *base_to_imx8qxp_ldb(struct ldb *base)
  61 {
  62         return container_of(base, struct imx8qxp_ldb, base);
  63 }
  64
  65 static void imx8qxp_ldb_set_phy_cfg(struct imx8qxp_ldb *imx8qxp_ldb,
  66                                     unsigned long di_clk, bool is_split,
  67                                     struct phy_configure_opts_lvds *phy_cfg)
  68 {
  69         phy_cfg->bits_per_lane_and_dclk_cycle = 7;
  70         phy_cfg->lanes = 4;
  71
  72         if (is_split) {
  73                 phy_cfg->differential_clk_rate = di_clk / 2;
  74                 phy_cfg->is_slave = !imx8qxp_ldb->companion;
  75         } else {
  76                 phy_cfg->differential_clk_rate = di_clk;
  77                 phy_cfg->is_slave = false;
  78         }
  79 }
  80
  81 static int
  82 imx8qxp_ldb_bridge_atomic_check(struct drm_bridge *bridge,
  83                                 struct drm_bridge_state *bridge_state,
  84                                 struct drm_crtc_state *crtc_state,
  85                                 struct drm_connector_state *conn_state)
  86 {
  87         struct ldb_channel *ldb_ch = bridge->driver_private;
  88         struct ldb *ldb = ldb_ch->ldb;
  89         struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
  90                                         base_to_imx8qxp_ldb_channel(ldb_ch);
  91         struct imx8qxp_ldb *imx8qxp_ldb = base_to_imx8qxp_ldb(ldb);
  92         struct drm_bridge *companion = imx8qxp_ldb->companion;
  93         struct drm_display_mode *adj = &crtc_state->adjusted_mode;
  94         unsigned long di_clk = adj->clock * 1000;
  95         bool is_split = ldb_channel_is_split_link(ldb_ch);
  96         union phy_configure_opts opts = { };
  97         struct phy_configure_opts_lvds *phy_cfg = &opts.lvds;
  98         int ret;
  99
 100         ret = ldb_bridge_atomic_check_helper(bridge, bridge_state,
 101                                              crtc_state, conn_state);
 102         if (ret)
 103                 return ret;
 104
 105         imx8qxp_ldb_set_phy_cfg(imx8qxp_ldb, di_clk, is_split, phy_cfg);
 106         ret = phy_validate(imx8qxp_ldb_ch->phy, PHY_MODE_LVDS, 0, &opts);
 107         if (ret < 0) {
 108                 DRM_DEV_DEBUG_DRIVER(imx8qxp_ldb->dev,
 109                                      "failed to validate PHY: %d\n", ret);
 110                 return ret;
 111         }
 112
 113         if (is_split && companion) {
 114                 ret = companion->funcs->atomic_check(companion,
 115                                         bridge_state, crtc_state, conn_state);
 116                 if (ret)
 117                         return ret;
 118         }
 119
 120         return ret;
 121 }
 122
 123 static void
 124 imx8qxp_ldb_bridge_mode_set(struct drm_bridge *bridge,
 125                             const struct drm_display_mode *mode,
 126                             const struct drm_display_mode *adjusted_mode)
 127 {
 128         struct ldb_channel *ldb_ch = bridge->driver_private;
 129         struct ldb_channel *companion_ldb_ch;
 130         struct ldb *ldb = ldb_ch->ldb;
 131         struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
 132                                         base_to_imx8qxp_ldb_channel(ldb_ch);
 133         struct imx8qxp_ldb *imx8qxp_ldb = base_to_imx8qxp_ldb(ldb);
 134         struct drm_bridge *companion = imx8qxp_ldb->companion;
 135         struct device *dev = imx8qxp_ldb->dev;
 136         unsigned long di_clk = adjusted_mode->clock * 1000;
 137         bool is_split = ldb_channel_is_split_link(ldb_ch);
 138         union phy_configure_opts opts = { };
 139         struct phy_configure_opts_lvds *phy_cfg = &opts.lvds;
 140         u32 chno = ldb_ch->chno;
 141         int ret;
 142
 143         ret = pm_runtime_get_sync(dev);
 144         if (ret < 0)
 145                 DRM_DEV_ERROR(dev, "failed to get runtime PM sync: %d\n", ret);
 146
 147         ret = phy_init(imx8qxp_ldb_ch->phy);
 148         if (ret < 0)
 149                 DRM_DEV_ERROR(dev, "failed to initialize PHY: %d\n", ret);
 150
 151         ret = phy_set_mode(imx8qxp_ldb_ch->phy, PHY_MODE_LVDS);
 152         if (ret < 0)
 153                 DRM_DEV_ERROR(dev, "failed to set PHY mode: %d\n", ret);
 154
 155         if (is_split && companion) {
 156                 companion_ldb_ch = bridge_to_ldb_ch(companion);
 157
 158                 companion_ldb_ch->in_bus_format = ldb_ch->in_bus_format;
 159                 companion_ldb_ch->out_bus_format = ldb_ch->out_bus_format;
 160         }
 161
 162         clk_set_rate(imx8qxp_ldb->clk_bypass, di_clk);
 163         clk_set_rate(imx8qxp_ldb->clk_pixel, di_clk);
 164
 165         imx8qxp_ldb_set_phy_cfg(imx8qxp_ldb, di_clk, is_split, phy_cfg);
 166         ret = phy_configure(imx8qxp_ldb_ch->phy, &opts);
 167         if (ret < 0)
 168                 DRM_DEV_ERROR(dev, "failed to configure PHY: %d\n", ret);
 169
 170         if (chno == 0)
 171                 ldb->ldb_ctrl &= ~LDB_CH_SEL;
 172         else
 173                 ldb->ldb_ctrl |= LDB_CH_SEL;
 174
 175         /* input VSYNC signal from pixel link is active low */
 176         if (imx8qxp_ldb_ch->di_id == 0)
 177                 ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
 178         else
 179                 ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
 180
 181         /*
 182          * For split mode, settle input VSYNC signal polarity and
 183          * channel selection down early.
 184          */
 185         if (is_split)
 186                 regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
 187
 188         ldb_bridge_mode_set_helper(bridge, mode, adjusted_mode);
 189
 190         if (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC)
 191                 regmap_update_bits(ldb->regmap, SS_CTRL, CH_VSYNC_M(chno), 0);
 192         else if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 193                 regmap_update_bits(ldb->regmap, SS_CTRL,
 194                                    CH_VSYNC_M(chno), CH_PVSYNC(chno));
 195
 196         if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC)
 197                 regmap_update_bits(ldb->regmap, SS_CTRL, CH_HSYNC_M(chno), 0);
 198         else if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 199                 regmap_update_bits(ldb->regmap, SS_CTRL,
 200                                    CH_HSYNC_M(chno), CH_PHSYNC(chno));
 201
 202         if (is_split && companion)
 203                 companion->funcs->mode_set(companion, mode, adjusted_mode);
 204 }
 205
 206 static void
 207 imx8qxp_ldb_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 208                                      struct drm_bridge_state *old_bridge_state)
 209 {
 210         struct ldb_channel *ldb_ch = bridge->driver_private;
 211         struct ldb *ldb = ldb_ch->ldb;
 212         struct imx8qxp_ldb *imx8qxp_ldb = base_to_imx8qxp_ldb(ldb);
 213         struct drm_bridge *companion = imx8qxp_ldb->companion;
 214         bool is_split = ldb_channel_is_split_link(ldb_ch);
 215
 216         clk_prepare_enable(imx8qxp_ldb->clk_pixel);
 217         clk_prepare_enable(imx8qxp_ldb->clk_bypass);
 218
 219         if (is_split && companion)
 220                 companion->funcs->atomic_pre_enable(companion, old_bridge_state);
 221 }
 222
 223 static void
 224 imx8qxp_ldb_bridge_atomic_enable(struct drm_bridge *bridge,
 225                                  struct drm_bridge_state *old_bridge_state)
 226 {
 227         struct ldb_channel *ldb_ch = bridge->driver_private;
 228         struct ldb *ldb = ldb_ch->ldb;
 229         struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
 230                                         base_to_imx8qxp_ldb_channel(ldb_ch);
 231         struct imx8qxp_ldb *imx8qxp_ldb = base_to_imx8qxp_ldb(ldb);
 232         struct drm_bridge *companion = imx8qxp_ldb->companion;
 233         struct device *dev = imx8qxp_ldb->dev;
 234         bool is_split = ldb_channel_is_split_link(ldb_ch);
 235         int ret;
 236
 237         if (ldb_ch->chno == 0 || is_split) {
 238                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
 239                 ldb->ldb_ctrl |= imx8qxp_ldb_ch->di_id == 0 ?
 240                                 LDB_CH0_MODE_EN_TO_DI0 : LDB_CH0_MODE_EN_TO_DI1;
 241         }
 242         if (ldb_ch->chno == 1 || is_split) {
 243                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
 244                 ldb->ldb_ctrl |= imx8qxp_ldb_ch->di_id == 0 ?
 245                                 LDB_CH1_MODE_EN_TO_DI0 : LDB_CH1_MODE_EN_TO_DI1;
 246         }
 247
 248         ldb_bridge_enable_helper(bridge);
 249
 250         ret = phy_power_on(imx8qxp_ldb_ch->phy);
 251         if (ret)
 252                 DRM_DEV_ERROR(dev, "failed to power on PHY: %d\n", ret);
 253
 254         if (is_split && companion)
 255                 companion->funcs->atomic_enable(companion, old_bridge_state);
 256 }
 257
 258 static void
 259 imx8qxp_ldb_bridge_atomic_disable(struct drm_bridge *bridge,
 260                                   struct drm_bridge_state *old_bridge_state)
 261 {
 262         struct ldb_channel *ldb_ch = bridge->driver_private;
 263         struct ldb *ldb = ldb_ch->ldb;
 264         struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
 265                                         base_to_imx8qxp_ldb_channel(ldb_ch);
 266         struct imx8qxp_ldb *imx8qxp_ldb = base_to_imx8qxp_ldb(ldb);
 267         struct drm_bridge *companion = imx8qxp_ldb->companion;
 268         struct device *dev = imx8qxp_ldb->dev;
 269         bool is_split = ldb_channel_is_split_link(ldb_ch);
 270         int ret;
 271
 272         ret = phy_power_off(imx8qxp_ldb_ch->phy);
 273         if (ret)
 274                 DRM_DEV_ERROR(dev, "failed to power off PHY: %d\n", ret);
 275
 276         ret = phy_exit(imx8qxp_ldb_ch->phy);
 277         if (ret < 0)
 278                 DRM_DEV_ERROR(dev, "failed to teardown PHY: %d\n", ret);
 279
 280         ldb_bridge_disable_helper(bridge);
 281
 282         clk_disable_unprepare(imx8qxp_ldb->clk_bypass);
 283         clk_disable_unprepare(imx8qxp_ldb->clk_pixel);
 284
 285         if (is_split && companion)
 286                 companion->funcs->atomic_disable(companion, old_bridge_state);
 287
 288         ret = pm_runtime_put(dev);
 289         if (ret < 0)
 290                 DRM_DEV_ERROR(dev, "failed to put runtime PM: %d\n", ret);
 291 }
 292
 293 static const u32 imx8qxp_ldb_bus_output_fmts[] = {
 294         MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,
 295         MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,
 296         MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA,
 297         MEDIA_BUS_FMT_FIXED,
 298 };
 299
 300 static bool imx8qxp_ldb_bus_output_fmt_supported(u32 fmt)
 301 {
 302         int i;
 303
 304         for (i = 0; i < ARRAY_SIZE(imx8qxp_ldb_bus_output_fmts); i++) {
 305                 if (imx8qxp_ldb_bus_output_fmts[i] == fmt)
 306                         return true;
 307         }
 308
 309         return false;
 310 }
 311
 312 static u32 *
 313 imx8qxp_ldb_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 314                                              struct drm_bridge_state *bridge_state,
 315                                              struct drm_crtc_state *crtc_state,
 316                                              struct drm_connector_state *conn_state,
 317                                              u32 output_fmt,
 318                                              unsigned int *num_input_fmts)
 319 {
 320         struct drm_display_info *di;
 321         const struct drm_format_info *finfo;
 322         u32 *input_fmts;
 323
 324         if (!imx8qxp_ldb_bus_output_fmt_supported(output_fmt))
 325                 return NULL;
 326
 327         *num_input_fmts = 1;
 328
 329         input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
 330         if (!input_fmts)
 331                 return NULL;
 332
 333         switch (output_fmt) {
 334         case MEDIA_BUS_FMT_FIXED:
 335                 di = &conn_state->connector->display_info;
 336
 337                 /*
 338                  * Look at the first bus format to determine input format.
 339                  * Default to MEDIA_BUS_FMT_RGB888_1X24, if no match.
 340                  */
 341                 if (di->num_bus_formats) {
 342                         finfo = drm_format_info(di->bus_formats[0]);
 343
 344                         input_fmts[0] = finfo->depth == 18 ?
 345                                         MEDIA_BUS_FMT_RGB666_1X24_CPADHI :
 346                                         MEDIA_BUS_FMT_RGB888_1X24;
 347                 } else {
 348                         input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
 349                 }
 350                 break;
 351         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
 352                 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 353                 break;
 354         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
 355         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
 356                 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
 357                 break;
 358         default:
 359                 kfree(input_fmts);
 360                 input_fmts = NULL;
 361                 break;
 362         }
 363
 364         return input_fmts;
 365 }
 366
 367 static u32 *
 368 imx8qxp_ldb_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
 369                                               struct drm_bridge_state *bridge_state,
 370                                               struct drm_crtc_state *crtc_state,
 371                                               struct drm_connector_state *conn_state,
 372                                               unsigned int *num_output_fmts)
 373 {
 374         *num_output_fmts = ARRAY_SIZE(imx8qxp_ldb_bus_output_fmts);
 375         return kmemdup(imx8qxp_ldb_bus_output_fmts,
 376                         sizeof(imx8qxp_ldb_bus_output_fmts), GFP_KERNEL);
 377 }
 378
 379 static enum drm_mode_status
 380 imx8qxp_ldb_bridge_mode_valid(struct drm_bridge *bridge,
 381                               const struct drm_display_info *info,
 382                               const struct drm_display_mode *mode)
 383 {
 384         struct ldb_channel *ldb_ch = bridge->driver_private;
 385         bool is_single = ldb_channel_is_single_link(ldb_ch);
 386
 387         if (mode->clock > 170000)
 388                 return MODE_CLOCK_HIGH;
 389
 390         if (mode->clock > 150000 && is_single)
 391                 return MODE_CLOCK_HIGH;
 392
 393         return MODE_OK;
 394 }
 395
 396 static const struct drm_bridge_funcs imx8qxp_ldb_bridge_funcs = {
 397         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 398         .atomic_destroy_state   = drm_atomic_helper_bridge_destroy_state,
 399         .atomic_reset           = drm_atomic_helper_bridge_reset,
 400         .mode_valid             = imx8qxp_ldb_bridge_mode_valid,
 401         .attach                 = ldb_bridge_attach_helper,
 402         .atomic_check           = imx8qxp_ldb_bridge_atomic_check,
 403         .mode_set               = imx8qxp_ldb_bridge_mode_set,
 404         .atomic_pre_enable      = imx8qxp_ldb_bridge_atomic_pre_enable,
 405         .atomic_enable          = imx8qxp_ldb_bridge_atomic_enable,
 406         .atomic_disable         = imx8qxp_ldb_bridge_atomic_disable,
 407         .atomic_get_input_bus_fmts =
 408                         imx8qxp_ldb_bridge_atomic_get_input_bus_fmts,
 409         .atomic_get_output_bus_fmts =
 410                         imx8qxp_ldb_bridge_atomic_get_output_bus_fmts,
 411 };
 412
 413 static int imx8qxp_ldb_set_di_id(struct imx8qxp_ldb *imx8qxp_ldb)
 414 {
 415         struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
 416                          &imx8qxp_ldb->channel[imx8qxp_ldb->active_chno];
 417         struct ldb_channel *ldb_ch = &imx8qxp_ldb_ch->base;
 418         struct device_node *ep, *remote;
 419         struct device *dev = imx8qxp_ldb->dev;
 420         struct of_endpoint endpoint;
 421         int ret;
 422
 423         ep = of_graph_get_endpoint_by_regs(ldb_ch->np, 0, -1);
 424         if (!ep) {
 425                 DRM_DEV_ERROR(dev, "failed to get port0 endpoint\n");
 426                 return -EINVAL;
 427         }
 428
 429         remote = of_graph_get_remote_endpoint(ep);
 430         of_node_put(ep);
 431         if (!remote) {
 432                 DRM_DEV_ERROR(dev, "failed to get port0 remote endpoint\n");
 433                 return -EINVAL;
 434         }
 435
 436         ret = of_graph_parse_endpoint(remote, &endpoint);
 437         of_node_put(remote);
 438         if (ret) {
 439                 DRM_DEV_ERROR(dev, "failed to parse port0 remote endpoint: %d\n",
 440                               ret);
 441                 return ret;
 442         }
 443
 444         imx8qxp_ldb_ch->di_id = endpoint.id;
 445
 446         return 0;
 447 }
 448
 449 static int
 450 imx8qxp_ldb_check_chno_and_dual_link(struct ldb_channel *ldb_ch, int link)
 451 {
 452         if ((link == DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS && ldb_ch->chno != 0) ||
 453             (link == DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS && ldb_ch->chno != 1))
 454                 return -EINVAL;
 455
 456         return 0;
 457 }
 458
 459 static int imx8qxp_ldb_parse_dt_companion(struct imx8qxp_ldb *imx8qxp_ldb)
 460 {
 461         struct imx8qxp_ldb_channel *imx8qxp_ldb_ch =
 462                          &imx8qxp_ldb->channel[imx8qxp_ldb->active_chno];
 463         struct ldb_channel *ldb_ch = &imx8qxp_ldb_ch->base;
 464         struct ldb_channel *companion_ldb_ch;
 465         struct device_node *companion;
 466         struct device_node *child;
 467         struct device_node *companion_port = NULL;
 468         struct device_node *port1, *port2;
 469         struct device *dev = imx8qxp_ldb->dev;
 470         const struct of_device_id *match;
 471         u32 i;
 472         int dual_link;
 473         int ret;
 474
 475         /* Locate the companion LDB for dual-link operation, if any. */
 476         companion = of_parse_phandle(dev->of_node, "fsl,companion-ldb", 0);
 477         if (!companion)
 478                 return 0;
 479
 480         if (!of_device_is_available(companion)) {
 481                 DRM_DEV_ERROR(dev, "companion LDB is not available\n");
 482                 ret = -ENODEV;
 483                 goto out;
 484         }
 485
 486         /*
 487          * Sanity check: the companion bridge must have the same compatible
 488          * string.
 489          */
 490         match = of_match_device(dev->driver->of_match_table, dev);
 491         if (!of_device_is_compatible(companion, match->compatible)) {
 492                 DRM_DEV_ERROR(dev, "companion LDB is incompatible\n");
 493                 ret = -ENXIO;
 494                 goto out;
 495         }
 496
 497         for_each_available_child_of_node(companion, child) {
 498                 ret = of_property_read_u32(child, "reg", &i);
 499                 if (ret || i > MAX_LDB_CHAN_NUM - 1) {
 500                         DRM_DEV_ERROR(dev,
 501                                       "invalid channel node address: %u\n", i);
 502                         ret = -EINVAL;
 503                         of_node_put(child);
 504                         goto out;
 505                 }
 506
 507                 /*
 508                  * Channel numbers have to be different, because channel0
 509                  * transmits odd pixels and channel1 transmits even pixels.
 510                  */
 511                 if (i == (ldb_ch->chno ^ 0x1)) {
 512                         companion_port = child;
 513                         break;
 514                 }
 515         }
 516
 517         if (!companion_port) {
 518                 DRM_DEV_ERROR(dev,
 519                               "failed to find companion LDB channel port\n");
 520                 ret = -EINVAL;
 521                 goto out;
 522         }
 523
 524         /*
 525          * We need to work out if the sink is expecting us to function in
 526          * dual-link mode.  We do this by looking at the DT port nodes we are
 527          * connected to.  If they are marked as expecting odd pixels and
 528          * even pixels than we need to enable LDB split mode.
 529          */
 530         port1 = of_graph_get_port_by_id(ldb_ch->np, 1);
 531         port2 = of_graph_get_port_by_id(companion_port, 1);
 532         dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);
 533         of_node_put(port1);
 534         of_node_put(port2);
 535
 536         switch (dual_link) {
 537         case DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS:
 538                 ldb_ch->link_type = LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS;
 539                 break;
 540         case DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS:
 541                 ldb_ch->link_type = LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS;
 542                 break;
 543         default:
 544                 ret = dual_link;
 545                 DRM_DEV_ERROR(dev,
 546                               "failed to get dual link pixel order: %d\n", ret);
 547                 goto out;
 548         }
 549
 550         ret = imx8qxp_ldb_check_chno_and_dual_link(ldb_ch, dual_link);
 551         if (ret < 0) {
 552                 DRM_DEV_ERROR(dev,
 553                               "unmatched channel number(%u) vs dual link(%d)\n",
 554                               ldb_ch->chno, dual_link);
 555                 goto out;
 556         }
 557
 558         imx8qxp_ldb->companion = of_drm_find_bridge(companion_port);
 559         if (!imx8qxp_ldb->companion) {
 560                 ret = -EPROBE_DEFER;
 561                 DRM_DEV_DEBUG_DRIVER(dev,
 562                                      "failed to find bridge for companion bridge: %d\n",
 563                                      ret);
 564                 goto out;
 565         }
 566
 567         DRM_DEV_DEBUG_DRIVER(dev,
 568                              "dual-link configuration detected (companion bridge %pOF)\n",
 569                              companion);
 570
 571         companion_ldb_ch = bridge_to_ldb_ch(imx8qxp_ldb->companion);
 572         companion_ldb_ch->link_type = ldb_ch->link_type;
 573 out:
 574         of_node_put(companion_port);
 575         of_node_put(companion);
 576         return ret;
 577 }
 578
 579 static int imx8qxp_ldb_probe(struct platform_device *pdev)
 580 {
 581         struct device *dev = &pdev->dev;
 582         struct imx8qxp_ldb *imx8qxp_ldb;
 583         struct imx8qxp_ldb_channel *imx8qxp_ldb_ch;
 584         struct ldb *ldb;
 585         struct ldb_channel *ldb_ch;
 586         int ret, i;
 587
 588         imx8qxp_ldb = devm_kzalloc(dev, sizeof(*imx8qxp_ldb), GFP_KERNEL);
 589         if (!imx8qxp_ldb)
 590                 return -ENOMEM;
 591
 592         imx8qxp_ldb->clk_pixel = devm_clk_get(dev, "pixel");
 593         if (IS_ERR(imx8qxp_ldb->clk_pixel)) {
 594                 ret = PTR_ERR(imx8qxp_ldb->clk_pixel);
 595                 if (ret != -EPROBE_DEFER)
 596                         DRM_DEV_ERROR(dev,
 597                                       "failed to get pixel clock: %d\n", ret);
 598                 return ret;
 599         }
 600
 601         imx8qxp_ldb->clk_bypass = devm_clk_get(dev, "bypass");
 602         if (IS_ERR(imx8qxp_ldb->clk_bypass)) {
 603                 ret = PTR_ERR(imx8qxp_ldb->clk_bypass);
 604                 if (ret != -EPROBE_DEFER)
 605                         DRM_DEV_ERROR(dev,
 606                                       "failed to get bypass clock: %d\n", ret);
 607                 return ret;
 608         }
 609
 610         imx8qxp_ldb->dev = dev;
 611
 612         ldb = &imx8qxp_ldb->base;
 613         ldb->dev = dev;
 614         ldb->ctrl_reg = 0xe0;
 615
 616         for (i = 0; i < MAX_LDB_CHAN_NUM; i++)
 617                 ldb->channel[i] = &imx8qxp_ldb->channel[i].base;
 618
 619         ret = ldb_init_helper(ldb);
 620         if (ret)
 621                 return ret;
 622
 623         if (ldb->available_ch_cnt == 0) {
 624                 DRM_DEV_DEBUG_DRIVER(dev, "no available channel\n");
 625                 return 0;
 626         } else if (ldb->available_ch_cnt > 1) {
 627                 DRM_DEV_ERROR(dev, "invalid available channel number(%u)\n",
 628                               ldb->available_ch_cnt);
 629                 return -EINVAL;
 630         }
 631
 632         for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
 633                 imx8qxp_ldb_ch = &imx8qxp_ldb->channel[i];
 634                 ldb_ch = &imx8qxp_ldb_ch->base;
 635
 636                 if (ldb_ch->is_available) {
 637                         imx8qxp_ldb->active_chno = ldb_ch->chno;
 638                         break;
 639                 }
 640         }
 641
 642         imx8qxp_ldb_ch->phy = devm_of_phy_get(dev, ldb_ch->np, "lvds_phy");
 643         if (IS_ERR(imx8qxp_ldb_ch->phy)) {
 644                 ret = PTR_ERR(imx8qxp_ldb_ch->phy);
 645                 if (ret != -EPROBE_DEFER)
 646                         DRM_DEV_ERROR(dev, "failed to get channel%d PHY: %d\n",
 647                                       imx8qxp_ldb->active_chno, ret);
 648                 return ret;
 649         }
 650
 651         ret = ldb_find_next_bridge_helper(ldb);
 652         if (ret)
 653                 return ret;
 654
 655         ret = imx8qxp_ldb_set_di_id(imx8qxp_ldb);
 656         if (ret)
 657                 return ret;
 658
 659         ret = imx8qxp_ldb_parse_dt_companion(imx8qxp_ldb);
 660         if (ret)
 661                 return ret;
 662
 663         platform_set_drvdata(pdev, imx8qxp_ldb);
 664         pm_runtime_enable(dev);
 665
 666         ldb_add_bridge_helper(ldb, &imx8qxp_ldb_bridge_funcs);
 667
 668         return ret;
 669 }
 670
 671 static void imx8qxp_ldb_remove(struct platform_device *pdev)
 672 {
 673         struct imx8qxp_ldb *imx8qxp_ldb = platform_get_drvdata(pdev);
 674         struct ldb *ldb = &imx8qxp_ldb->base;
 675
 676         ldb_remove_bridge_helper(ldb);
 677
 678         pm_runtime_disable(&pdev->dev);
 679 }
 680
 681 static int imx8qxp_ldb_runtime_suspend(struct device *dev)
 682 {
 683         return 0;
 684 }
 685
 686 static int imx8qxp_ldb_runtime_resume(struct device *dev)
 687 {
 688         struct imx8qxp_ldb *imx8qxp_ldb = dev_get_drvdata(dev);
 689         struct ldb *ldb = &imx8qxp_ldb->base;
 690
 691         /* disable LDB by resetting the control register to POR default */
 692         regmap_write(ldb->regmap, ldb->ctrl_reg, 0);
 693
 694         return 0;
 695 }
 696
 697 static const struct dev_pm_ops imx8qxp_ldb_pm_ops = {
 698         RUNTIME_PM_OPS(imx8qxp_ldb_runtime_suspend, imx8qxp_ldb_runtime_resume, NULL)
 699 };
 700
 701 static const struct of_device_id imx8qxp_ldb_dt_ids[] = {
 702         { .compatible = "fsl,imx8qxp-ldb" },
 703         { /* sentinel */ }
 704 };
 705 MODULE_DEVICE_TABLE(of, imx8qxp_ldb_dt_ids);
 706
 707 static struct platform_driver imx8qxp_ldb_driver = {
 708         .probe  = imx8qxp_ldb_probe,
 709         .remove = imx8qxp_ldb_remove,
 710         .driver = {
 711                 .pm = pm_ptr(&imx8qxp_ldb_pm_ops),
 712                 .name = DRIVER_NAME,
 713                 .of_match_table = imx8qxp_ldb_dt_ids,
 714         },
 715 };
 716 module_platform_driver(imx8qxp_ldb_driver);
 717
 718 MODULE_DESCRIPTION("i.MX8QXP LVDS Display Bridge(LDB)/Pixel Mapper bridge driver");
 719 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
 720 MODULE_LICENSE("GPL v2");
 721 MODULE_ALIAS("platform:" DRIVER_NAME);