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

   1 /*
   2  * i.MX drm driver - LVDS display bridge
   3  *
   4  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/clk.h>
  18 #include <linux/component.h>
  19 #include <drm/drmP.h>
  20 #include <drm/drm_fb_helper.h>
  21 #include <drm/drm_crtc_helper.h>
  22 #include <drm/drm_panel.h>
  23 #include <linux/mfd/syscon.h>
  24 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  25 #include <linux/of_device.h>
  26 #include <linux/of_graph.h>
  27 #include <video/of_videomode.h>
  28 #include <linux/regmap.h>
  29 #include <linux/videodev2.h>
  30
  31 #include "imx-drm.h"
  32
  33 #define DRIVER_NAME "imx-ldb"
  34
  35 #define LDB_CH0_MODE_EN_TO_DI0          (1 << 0)
  36 #define LDB_CH0_MODE_EN_TO_DI1          (3 << 0)
  37 #define LDB_CH0_MODE_EN_MASK            (3 << 0)
  38 #define LDB_CH1_MODE_EN_TO_DI0          (1 << 2)
  39 #define LDB_CH1_MODE_EN_TO_DI1          (3 << 2)
  40 #define LDB_CH1_MODE_EN_MASK            (3 << 2)
  41 #define LDB_SPLIT_MODE_EN               (1 << 4)
  42 #define LDB_DATA_WIDTH_CH0_24           (1 << 5)
  43 #define LDB_BIT_MAP_CH0_JEIDA           (1 << 6)
  44 #define LDB_DATA_WIDTH_CH1_24           (1 << 7)
  45 #define LDB_BIT_MAP_CH1_JEIDA           (1 << 8)
  46 #define LDB_DI0_VS_POL_ACT_LOW          (1 << 9)
  47 #define LDB_DI1_VS_POL_ACT_LOW          (1 << 10)
  48 #define LDB_BGREF_RMODE_INT             (1 << 15)
  49
  50 #define con_to_imx_ldb_ch(x) container_of(x, struct imx_ldb_channel, connector)
  51 #define enc_to_imx_ldb_ch(x) container_of(x, struct imx_ldb_channel, encoder)
  52
  53 struct imx_ldb;
  54
  55 struct imx_ldb_channel {
  56         struct imx_ldb *ldb;
  57         struct drm_connector connector;
  58         struct drm_encoder encoder;
  59         struct drm_panel *panel;
  60         struct device_node *child;
  61         int chno;
  62         void *edid;
  63         int edid_len;
  64         struct drm_display_mode mode;
  65         int mode_valid;
  66 };
  67
  68 struct bus_mux {
  69         int reg;
  70         int shift;
  71         int mask;
  72 };
  73
  74 struct imx_ldb {
  75         struct regmap *regmap;
  76         struct device *dev;
  77         struct imx_ldb_channel channel[2];
  78         struct clk *clk[2]; /* our own clock */
  79         struct clk *clk_sel[4]; /* parent of display clock */
  80         struct clk *clk_parent[4]; /* original parent of clk_sel */
  81         struct clk *clk_pll[2]; /* upstream clock we can adjust */
  82         u32 ldb_ctrl;
  83         const struct bus_mux *lvds_mux;
  84 };
  85
  86 static enum drm_connector_status imx_ldb_connector_detect(
  87                 struct drm_connector *connector, bool force)
  88 {
  89         return connector_status_connected;
  90 }
  91
  92 static int imx_ldb_connector_get_modes(struct drm_connector *connector)
  93 {
  94         struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
  95         int num_modes = 0;
  96
  97         if (imx_ldb_ch->panel && imx_ldb_ch->panel->funcs &&
  98             imx_ldb_ch->panel->funcs->get_modes) {
  99                 num_modes = imx_ldb_ch->panel->funcs->get_modes(imx_ldb_ch->panel);
 100                 if (num_modes > 0)
 101                         return num_modes;
 102         }
 103
 104         if (imx_ldb_ch->edid) {
 105                 drm_mode_connector_update_edid_property(connector,
 106                                                         imx_ldb_ch->edid);
 107                 num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid);
 108         }
 109
 110         if (imx_ldb_ch->mode_valid) {
 111                 struct drm_display_mode *mode;
 112
 113                 mode = drm_mode_create(connector->dev);
 114                 if (!mode)
 115                         return -EINVAL;
 116                 drm_mode_copy(mode, &imx_ldb_ch->mode);
 117                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 118                 drm_mode_probed_add(connector, mode);
 119                 num_modes++;
 120         }
 121
 122         return num_modes;
 123 }
 124
 125 static struct drm_encoder *imx_ldb_connector_best_encoder(
 126                 struct drm_connector *connector)
 127 {
 128         struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
 129
 130         return &imx_ldb_ch->encoder;
 131 }
 132
 133 static void imx_ldb_encoder_dpms(struct drm_encoder *encoder, int mode)
 134 {
 135 }
 136
 137 static bool imx_ldb_encoder_mode_fixup(struct drm_encoder *encoder,
 138                            const struct drm_display_mode *mode,
 139                            struct drm_display_mode *adjusted_mode)
 140 {
 141         return true;
 142 }
 143
 144 static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
 145                 unsigned long serial_clk, unsigned long di_clk)
 146 {
 147         int ret;
 148
 149         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
 150                         clk_get_rate(ldb->clk_pll[chno]), serial_clk);
 151         clk_set_rate(ldb->clk_pll[chno], serial_clk);
 152
 153         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
 154                         clk_get_rate(ldb->clk_pll[chno]));
 155
 156         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
 157                         clk_get_rate(ldb->clk[chno]),
 158                         (long int)di_clk);
 159         clk_set_rate(ldb->clk[chno], di_clk);
 160
 161         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
 162                         clk_get_rate(ldb->clk[chno]));
 163
 164         /* set display clock mux to LDB input clock */
 165         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]);
 166         if (ret)
 167                 dev_err(ldb->dev,
 168                         "unable to set di%d parent clock to ldb_di%d\n", mux,
 169                         chno);
 170 }
 171
 172 static void imx_ldb_encoder_prepare(struct drm_encoder *encoder)
 173 {
 174         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 175         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 176         u32 bus_format;
 177
 178         switch (imx_ldb_ch->chno) {
 179         case 0:
 180                 bus_format = (ldb->ldb_ctrl & LDB_DATA_WIDTH_CH0_24) ?
 181                         MEDIA_BUS_FMT_RGB888_1X24 : MEDIA_BUS_FMT_RGB666_1X18;
 182                 break;
 183         case 1:
 184                 bus_format = (ldb->ldb_ctrl & LDB_DATA_WIDTH_CH1_24) ?
 185                         MEDIA_BUS_FMT_RGB888_1X24 : MEDIA_BUS_FMT_RGB666_1X18;
 186                 break;
 187         default:
 188                 dev_err(ldb->dev, "unable to config di%d panel format\n",
 189                         imx_ldb_ch->chno);
 190                 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 191         }
 192
 193         imx_drm_set_bus_format(encoder, bus_format);
 194 }
 195
 196 static void imx_ldb_encoder_commit(struct drm_encoder *encoder)
 197 {
 198         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 199         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 200         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 201         int mux = imx_drm_encoder_get_mux_id(imx_ldb_ch->child, encoder);
 202
 203         drm_panel_prepare(imx_ldb_ch->panel);
 204
 205         if (dual) {
 206                 clk_prepare_enable(ldb->clk[0]);
 207                 clk_prepare_enable(ldb->clk[1]);
 208         }
 209
 210         if (imx_ldb_ch == &ldb->channel[0] || dual) {
 211                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
 212                 if (mux == 0 || ldb->lvds_mux)
 213                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
 214                 else if (mux == 1)
 215                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
 216         }
 217         if (imx_ldb_ch == &ldb->channel[1] || dual) {
 218                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
 219                 if (mux == 1 || ldb->lvds_mux)
 220                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
 221                 else if (mux == 0)
 222                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
 223         }
 224
 225         if (ldb->lvds_mux) {
 226                 const struct bus_mux *lvds_mux = NULL;
 227
 228                 if (imx_ldb_ch == &ldb->channel[0])
 229                         lvds_mux = &ldb->lvds_mux[0];
 230                 else if (imx_ldb_ch == &ldb->channel[1])
 231                         lvds_mux = &ldb->lvds_mux[1];
 232
 233                 regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
 234                                    mux << lvds_mux->shift);
 235         }
 236
 237         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
 238
 239         drm_panel_enable(imx_ldb_ch->panel);
 240 }
 241
 242 static void imx_ldb_encoder_mode_set(struct drm_encoder *encoder,
 243                          struct drm_display_mode *orig_mode,
 244                          struct drm_display_mode *mode)
 245 {
 246         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 247         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 248         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 249         unsigned long serial_clk;
 250         unsigned long di_clk = mode->clock * 1000;
 251         int mux = imx_drm_encoder_get_mux_id(imx_ldb_ch->child, encoder);
 252
 253         if (mode->clock > 170000) {
 254                 dev_warn(ldb->dev,
 255                          "%s: mode exceeds 170 MHz pixel clock\n", __func__);
 256         }
 257         if (mode->clock > 85000 && !dual) {
 258                 dev_warn(ldb->dev,
 259                          "%s: mode exceeds 85 MHz pixel clock\n", __func__);
 260         }
 261
 262         if (dual) {
 263                 serial_clk = 3500UL * mode->clock;
 264                 imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
 265                 imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk);
 266         } else {
 267                 serial_clk = 7000UL * mode->clock;
 268                 imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk,
 269                                   di_clk);
 270         }
 271
 272         /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
 273         if (imx_ldb_ch == &ldb->channel[0]) {
 274                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 275                         ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
 276                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 277                         ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
 278         }
 279         if (imx_ldb_ch == &ldb->channel[1]) {
 280                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 281                         ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
 282                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 283                         ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
 284         }
 285 }
 286
 287 static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
 288 {
 289         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 290         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 291         int mux, ret;
 292
 293         /*
 294          * imx_ldb_encoder_disable is called by
 295          * drm_helper_disable_unused_functions without
 296          * the encoder being enabled before.
 297          */
 298         if (imx_ldb_ch == &ldb->channel[0] &&
 299             (ldb->ldb_ctrl & LDB_CH0_MODE_EN_MASK) == 0)
 300                 return;
 301         else if (imx_ldb_ch == &ldb->channel[1] &&
 302                  (ldb->ldb_ctrl & LDB_CH1_MODE_EN_MASK) == 0)
 303                 return;
 304
 305         drm_panel_disable(imx_ldb_ch->panel);
 306
 307         if (imx_ldb_ch == &ldb->channel[0])
 308                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
 309         else if (imx_ldb_ch == &ldb->channel[1])
 310                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
 311
 312         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
 313
 314         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
 315                 clk_disable_unprepare(ldb->clk[0]);
 316                 clk_disable_unprepare(ldb->clk[1]);
 317         }
 318
 319         if (ldb->lvds_mux) {
 320                 const struct bus_mux *lvds_mux = NULL;
 321
 322                 if (imx_ldb_ch == &ldb->channel[0])
 323                         lvds_mux = &ldb->lvds_mux[0];
 324                 else if (imx_ldb_ch == &ldb->channel[1])
 325                         lvds_mux = &ldb->lvds_mux[1];
 326
 327                 regmap_read(ldb->regmap, lvds_mux->reg, &mux);
 328                 mux &= lvds_mux->mask;
 329                 mux >>= lvds_mux->shift;
 330         } else {
 331                 mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
 332         }
 333
 334         /* set display clock mux back to original input clock */
 335         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
 336         if (ret)
 337                 dev_err(ldb->dev,
 338                         "unable to set di%d parent clock to original parent\n",
 339                         mux);
 340
 341         drm_panel_unprepare(imx_ldb_ch->panel);
 342 }
 343
 344 static struct drm_connector_funcs imx_ldb_connector_funcs = {
 345         .dpms = drm_helper_connector_dpms,
 346         .fill_modes = drm_helper_probe_single_connector_modes,
 347         .detect = imx_ldb_connector_detect,
 348         .destroy = imx_drm_connector_destroy,
 349 };
 350
 351 static struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
 352         .get_modes = imx_ldb_connector_get_modes,
 353         .best_encoder = imx_ldb_connector_best_encoder,
 354 };
 355
 356 static struct drm_encoder_funcs imx_ldb_encoder_funcs = {
 357         .destroy = imx_drm_encoder_destroy,
 358 };
 359
 360 static struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
 361         .dpms = imx_ldb_encoder_dpms,
 362         .mode_fixup = imx_ldb_encoder_mode_fixup,
 363         .prepare = imx_ldb_encoder_prepare,
 364         .commit = imx_ldb_encoder_commit,
 365         .mode_set = imx_ldb_encoder_mode_set,
 366         .disable = imx_ldb_encoder_disable,
 367 };
 368
 369 static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
 370 {
 371         char clkname[16];
 372
 373         snprintf(clkname, sizeof(clkname), "di%d", chno);
 374         ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
 375         if (IS_ERR(ldb->clk[chno]))
 376                 return PTR_ERR(ldb->clk[chno]);
 377
 378         snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
 379         ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
 380
 381         return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
 382 }
 383
 384 static int imx_ldb_register(struct drm_device *drm,
 385         struct imx_ldb_channel *imx_ldb_ch)
 386 {
 387         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 388         int ret;
 389
 390         ret = imx_drm_encoder_parse_of(drm, &imx_ldb_ch->encoder,
 391                                        imx_ldb_ch->child);
 392         if (ret)
 393                 return ret;
 394
 395         ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
 396         if (ret)
 397                 return ret;
 398
 399         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
 400                 ret = imx_ldb_get_clk(ldb, 1);
 401                 if (ret)
 402                         return ret;
 403         }
 404
 405         drm_encoder_helper_add(&imx_ldb_ch->encoder,
 406                         &imx_ldb_encoder_helper_funcs);
 407         drm_encoder_init(drm, &imx_ldb_ch->encoder, &imx_ldb_encoder_funcs,
 408                          DRM_MODE_ENCODER_LVDS);
 409
 410         drm_connector_helper_add(&imx_ldb_ch->connector,
 411                         &imx_ldb_connector_helper_funcs);
 412         drm_connector_init(drm, &imx_ldb_ch->connector,
 413                            &imx_ldb_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
 414
 415         if (imx_ldb_ch->panel)
 416                 drm_panel_attach(imx_ldb_ch->panel, &imx_ldb_ch->connector);
 417
 418         drm_mode_connector_attach_encoder(&imx_ldb_ch->connector,
 419                         &imx_ldb_ch->encoder);
 420
 421         return 0;
 422 }
 423
 424 enum {
 425         LVDS_BIT_MAP_SPWG,
 426         LVDS_BIT_MAP_JEIDA
 427 };
 428
 429 static const char * const imx_ldb_bit_mappings[] = {
 430         [LVDS_BIT_MAP_SPWG]  = "spwg",
 431         [LVDS_BIT_MAP_JEIDA] = "jeida",
 432 };
 433
 434 static const int of_get_data_mapping(struct device_node *np)
 435 {
 436         const char *bm;
 437         int ret, i;
 438
 439         ret = of_property_read_string(np, "fsl,data-mapping", &bm);
 440         if (ret < 0)
 441                 return ret;
 442
 443         for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++)
 444                 if (!strcasecmp(bm, imx_ldb_bit_mappings[i]))
 445                         return i;
 446
 447         return -EINVAL;
 448 }
 449
 450 static struct bus_mux imx6q_lvds_mux[2] = {
 451         {
 452                 .reg = IOMUXC_GPR3,
 453                 .shift = 6,
 454                 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
 455         }, {
 456                 .reg = IOMUXC_GPR3,
 457                 .shift = 8,
 458                 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
 459         }
 460 };
 461
 462 /*
 463  * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
 464  * of_match_device will walk through this list and take the first entry
 465  * matching any of its compatible values. Therefore, the more generic
 466  * entries (in this case fsl,imx53-ldb) need to be ordered last.
 467  */
 468 static const struct of_device_id imx_ldb_dt_ids[] = {
 469         { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
 470         { .compatible = "fsl,imx53-ldb", .data = NULL, },
 471         { }
 472 };
 473 MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
 474
 475 static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 476 {
 477         struct drm_device *drm = data;
 478         struct device_node *np = dev->of_node;
 479         const struct of_device_id *of_id =
 480                         of_match_device(imx_ldb_dt_ids, dev);
 481         struct device_node *child;
 482         const u8 *edidp;
 483         struct imx_ldb *imx_ldb;
 484         int datawidth;
 485         int mapping;
 486         int dual;
 487         int ret;
 488         int i;
 489
 490         imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
 491         if (!imx_ldb)
 492                 return -ENOMEM;
 493
 494         imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
 495         if (IS_ERR(imx_ldb->regmap)) {
 496                 dev_err(dev, "failed to get parent regmap\n");
 497                 return PTR_ERR(imx_ldb->regmap);
 498         }
 499
 500         imx_ldb->dev = dev;
 501
 502         if (of_id)
 503                 imx_ldb->lvds_mux = of_id->data;
 504
 505         dual = of_property_read_bool(np, "fsl,dual-channel");
 506         if (dual)
 507                 imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
 508
 509         /*
 510          * There are three different possible clock mux configurations:
 511          * i.MX53:  ipu1_di0_sel, ipu1_di1_sel
 512          * i.MX6q:  ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
 513          * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
 514          * Map them all to di0_sel...di3_sel.
 515          */
 516         for (i = 0; i < 4; i++) {
 517                 char clkname[16];
 518
 519                 sprintf(clkname, "di%d_sel", i);
 520                 imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
 521                 if (IS_ERR(imx_ldb->clk_sel[i])) {
 522                         ret = PTR_ERR(imx_ldb->clk_sel[i]);
 523                         imx_ldb->clk_sel[i] = NULL;
 524                         break;
 525                 }
 526
 527                 imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
 528         }
 529         if (i == 0)
 530                 return ret;
 531
 532         for_each_child_of_node(np, child) {
 533                 struct imx_ldb_channel *channel;
 534                 struct device_node *port;
 535
 536                 ret = of_property_read_u32(child, "reg", &i);
 537                 if (ret || i < 0 || i > 1)
 538                         return -EINVAL;
 539
 540                 if (dual && i > 0) {
 541                         dev_warn(dev, "dual-channel mode, ignoring second output\n");
 542                         continue;
 543                 }
 544
 545                 if (!of_device_is_available(child))
 546                         continue;
 547
 548                 channel = &imx_ldb->channel[i];
 549                 channel->ldb = imx_ldb;
 550                 channel->chno = i;
 551                 channel->child = child;
 552
 553                 /*
 554                  * The output port is port@4 with an external 4-port mux or
 555                  * port@2 with the internal 2-port mux.
 556                  */
 557                 port = of_graph_get_port_by_id(child, imx_ldb->lvds_mux ? 4 : 2);
 558                 if (port) {
 559                         struct device_node *endpoint, *remote;
 560
 561                         endpoint = of_get_child_by_name(port, "endpoint");
 562                         if (endpoint) {
 563                                 remote = of_graph_get_remote_port_parent(endpoint);
 564                                 if (remote)
 565                                         channel->panel = of_drm_find_panel(remote);
 566                                 else
 567                                         return -EPROBE_DEFER;
 568                                 if (!channel->panel) {
 569                                         dev_err(dev, "panel not found: %s\n",
 570                                                 remote->full_name);
 571                                         return -EPROBE_DEFER;
 572                                 }
 573                         }
 574                 }
 575
 576                 edidp = of_get_property(child, "edid", &channel->edid_len);
 577                 if (edidp) {
 578                         channel->edid = kmemdup(edidp, channel->edid_len,
 579                                                 GFP_KERNEL);
 580                 } else if (!channel->panel) {
 581                         ret = of_get_drm_display_mode(child, &channel->mode, 0);
 582                         if (!ret)
 583                                 channel->mode_valid = 1;
 584                 }
 585
 586                 ret = of_property_read_u32(child, "fsl,data-width", &datawidth);
 587                 if (ret)
 588                         datawidth = 0;
 589                 else if (datawidth != 18 && datawidth != 24)
 590                         return -EINVAL;
 591
 592                 mapping = of_get_data_mapping(child);
 593                 switch (mapping) {
 594                 case LVDS_BIT_MAP_SPWG:
 595                         if (datawidth == 24) {
 596                                 if (i == 0 || dual)
 597                                         imx_ldb->ldb_ctrl |=
 598                                                 LDB_DATA_WIDTH_CH0_24;
 599                                 if (i == 1 || dual)
 600                                         imx_ldb->ldb_ctrl |=
 601                                                 LDB_DATA_WIDTH_CH1_24;
 602                         }
 603                         break;
 604                 case LVDS_BIT_MAP_JEIDA:
 605                         if (datawidth == 18) {
 606                                 dev_err(dev, "JEIDA standard only supported in 24 bit\n");
 607                                 return -EINVAL;
 608                         }
 609                         if (i == 0 || dual)
 610                                 imx_ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
 611                                         LDB_BIT_MAP_CH0_JEIDA;
 612                         if (i == 1 || dual)
 613                                 imx_ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
 614                                         LDB_BIT_MAP_CH1_JEIDA;
 615                         break;
 616                 default:
 617                         dev_err(dev, "data mapping not specified or invalid\n");
 618                         return -EINVAL;
 619                 }
 620
 621                 ret = imx_ldb_register(drm, channel);
 622                 if (ret)
 623                         return ret;
 624         }
 625
 626         dev_set_drvdata(dev, imx_ldb);
 627
 628         return 0;
 629 }
 630
 631 static void imx_ldb_unbind(struct device *dev, struct device *master,
 632         void *data)
 633 {
 634         struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
 635         int i;
 636
 637         for (i = 0; i < 2; i++) {
 638                 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
 639
 640                 if (!channel->connector.funcs)
 641                         continue;
 642
 643                 channel->connector.funcs->destroy(&channel->connector);
 644                 channel->encoder.funcs->destroy(&channel->encoder);
 645
 646                 kfree(channel->edid);
 647         }
 648 }
 649
 650 static const struct component_ops imx_ldb_ops = {
 651         .bind   = imx_ldb_bind,
 652         .unbind = imx_ldb_unbind,
 653 };
 654
 655 static int imx_ldb_probe(struct platform_device *pdev)
 656 {
 657         return component_add(&pdev->dev, &imx_ldb_ops);
 658 }
 659
 660 static int imx_ldb_remove(struct platform_device *pdev)
 661 {
 662         component_del(&pdev->dev, &imx_ldb_ops);
 663         return 0;
 664 }
 665
 666 static struct platform_driver imx_ldb_driver = {
 667         .probe          = imx_ldb_probe,
 668         .remove         = imx_ldb_remove,
 669         .driver         = {
 670                 .of_match_table = imx_ldb_dt_ids,
 671                 .name   = DRIVER_NAME,
 672         },
 673 };
 674
 675 module_platform_driver(imx_ldb_driver);
 676
 677 MODULE_DESCRIPTION("i.MX LVDS driver");
 678 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 679 MODULE_LICENSE("GPL");
 680 MODULE_ALIAS("platform:" DRIVER_NAME);