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_atomic.h>
  21 #include <drm/drm_atomic_helper.h>
  22 #include <drm/drm_fb_helper.h>
  23 #include <drm/drm_crtc_helper.h>
  24 #include <drm/drm_of.h>
  25 #include <drm/drm_panel.h>
  26 #include <linux/mfd/syscon.h>
  27 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  28 #include <linux/of_device.h>
  29 #include <linux/of_graph.h>
  30 #include <video/of_display_timing.h>
  31 #include <video/of_videomode.h>
  32 #include <linux/regmap.h>
  33 #include <linux/videodev2.h>
  34
  35 #include "imx-drm.h"
  36
  37 #define DRIVER_NAME "imx-ldb"
  38
  39 #define LDB_CH0_MODE_EN_TO_DI0          (1 << 0)
  40 #define LDB_CH0_MODE_EN_TO_DI1          (3 << 0)
  41 #define LDB_CH0_MODE_EN_MASK            (3 << 0)
  42 #define LDB_CH1_MODE_EN_TO_DI0          (1 << 2)
  43 #define LDB_CH1_MODE_EN_TO_DI1          (3 << 2)
  44 #define LDB_CH1_MODE_EN_MASK            (3 << 2)
  45 #define LDB_SPLIT_MODE_EN               (1 << 4)
  46 #define LDB_DATA_WIDTH_CH0_24           (1 << 5)
  47 #define LDB_BIT_MAP_CH0_JEIDA           (1 << 6)
  48 #define LDB_DATA_WIDTH_CH1_24           (1 << 7)
  49 #define LDB_BIT_MAP_CH1_JEIDA           (1 << 8)
  50 #define LDB_DI0_VS_POL_ACT_LOW          (1 << 9)
  51 #define LDB_DI1_VS_POL_ACT_LOW          (1 << 10)
  52 #define LDB_BGREF_RMODE_INT             (1 << 15)
  53
  54 struct imx_ldb;
  55
  56 struct imx_ldb_channel {
  57         struct imx_ldb *ldb;
  58         struct drm_connector connector;
  59         struct drm_encoder encoder;
  60         struct drm_panel *panel;
  61         struct device_node *child;
  62         struct i2c_adapter *ddc;
  63         int chno;
  64         void *edid;
  65         int edid_len;
  66         struct drm_display_mode mode;
  67         int mode_valid;
  68         u32 bus_format;
  69         u32 bus_flags;
  70 };
  71
  72 static inline struct imx_ldb_channel *con_to_imx_ldb_ch(struct drm_connector *c)
  73 {
  74         return container_of(c, struct imx_ldb_channel, connector);
  75 }
  76
  77 static inline struct imx_ldb_channel *enc_to_imx_ldb_ch(struct drm_encoder *e)
  78 {
  79         return container_of(e, struct imx_ldb_channel, encoder);
  80 }
  81
  82 struct bus_mux {
  83         int reg;
  84         int shift;
  85         int mask;
  86 };
  87
  88 struct imx_ldb {
  89         struct regmap *regmap;
  90         struct device *dev;
  91         struct imx_ldb_channel channel[2];
  92         struct clk *clk[2]; /* our own clock */
  93         struct clk *clk_sel[4]; /* parent of display clock */
  94         struct clk *clk_parent[4]; /* original parent of clk_sel */
  95         struct clk *clk_pll[2]; /* upstream clock we can adjust */
  96         u32 ldb_ctrl;
  97         const struct bus_mux *lvds_mux;
  98 };
  99
 100 static enum drm_connector_status imx_ldb_connector_detect(
 101                 struct drm_connector *connector, bool force)
 102 {
 103         return connector_status_connected;
 104 }
 105
 106 static void imx_ldb_ch_set_bus_format(struct imx_ldb_channel *imx_ldb_ch,
 107                                       u32 bus_format)
 108 {
 109         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 110         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 111
 112         switch (bus_format) {
 113         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
 114                 break;
 115         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
 116                 if (imx_ldb_ch->chno == 0 || dual)
 117                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
 118                 if (imx_ldb_ch->chno == 1 || dual)
 119                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
 120                 break;
 121         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
 122                 if (imx_ldb_ch->chno == 0 || dual)
 123                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
 124                                          LDB_BIT_MAP_CH0_JEIDA;
 125                 if (imx_ldb_ch->chno == 1 || dual)
 126                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
 127                                          LDB_BIT_MAP_CH1_JEIDA;
 128                 break;
 129         }
 130 }
 131
 132 static int imx_ldb_connector_get_modes(struct drm_connector *connector)
 133 {
 134         struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
 135         int num_modes = 0;
 136
 137         if (imx_ldb_ch->panel && imx_ldb_ch->panel->funcs &&
 138             imx_ldb_ch->panel->funcs->get_modes) {
 139                 num_modes = imx_ldb_ch->panel->funcs->get_modes(imx_ldb_ch->panel);
 140                 if (num_modes > 0)
 141                         return num_modes;
 142         }
 143
 144         if (!imx_ldb_ch->edid && imx_ldb_ch->ddc)
 145                 imx_ldb_ch->edid = drm_get_edid(connector, imx_ldb_ch->ddc);
 146
 147         if (imx_ldb_ch->edid) {
 148                 drm_mode_connector_update_edid_property(connector,
 149                                                         imx_ldb_ch->edid);
 150                 num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid);
 151         }
 152
 153         if (imx_ldb_ch->mode_valid) {
 154                 struct drm_display_mode *mode;
 155
 156                 mode = drm_mode_create(connector->dev);
 157                 if (!mode)
 158                         return -EINVAL;
 159                 drm_mode_copy(mode, &imx_ldb_ch->mode);
 160                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 161                 drm_mode_probed_add(connector, mode);
 162                 num_modes++;
 163         }
 164
 165         return num_modes;
 166 }
 167
 168 static struct drm_encoder *imx_ldb_connector_best_encoder(
 169                 struct drm_connector *connector)
 170 {
 171         struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
 172
 173         return &imx_ldb_ch->encoder;
 174 }
 175
 176 static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
 177                 unsigned long serial_clk, unsigned long di_clk)
 178 {
 179         int ret;
 180
 181         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
 182                         clk_get_rate(ldb->clk_pll[chno]), serial_clk);
 183         clk_set_rate(ldb->clk_pll[chno], serial_clk);
 184
 185         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
 186                         clk_get_rate(ldb->clk_pll[chno]));
 187
 188         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
 189                         clk_get_rate(ldb->clk[chno]),
 190                         (long int)di_clk);
 191         clk_set_rate(ldb->clk[chno], di_clk);
 192
 193         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
 194                         clk_get_rate(ldb->clk[chno]));
 195
 196         /* set display clock mux to LDB input clock */
 197         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]);
 198         if (ret)
 199                 dev_err(ldb->dev,
 200                         "unable to set di%d parent clock to ldb_di%d\n", mux,
 201                         chno);
 202 }
 203
 204 static void imx_ldb_encoder_enable(struct drm_encoder *encoder)
 205 {
 206         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 207         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 208         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 209         int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
 210
 211         drm_panel_prepare(imx_ldb_ch->panel);
 212
 213         if (dual) {
 214                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[0]);
 215                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[1]);
 216
 217                 clk_prepare_enable(ldb->clk[0]);
 218                 clk_prepare_enable(ldb->clk[1]);
 219         } else {
 220                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[imx_ldb_ch->chno]);
 221         }
 222
 223         if (imx_ldb_ch == &ldb->channel[0] || dual) {
 224                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
 225                 if (mux == 0 || ldb->lvds_mux)
 226                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
 227                 else if (mux == 1)
 228                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
 229         }
 230         if (imx_ldb_ch == &ldb->channel[1] || dual) {
 231                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
 232                 if (mux == 1 || ldb->lvds_mux)
 233                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
 234                 else if (mux == 0)
 235                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
 236         }
 237
 238         if (ldb->lvds_mux) {
 239                 const struct bus_mux *lvds_mux = NULL;
 240
 241                 if (imx_ldb_ch == &ldb->channel[0])
 242                         lvds_mux = &ldb->lvds_mux[0];
 243                 else if (imx_ldb_ch == &ldb->channel[1])
 244                         lvds_mux = &ldb->lvds_mux[1];
 245
 246                 regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
 247                                    mux << lvds_mux->shift);
 248         }
 249
 250         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
 251
 252         drm_panel_enable(imx_ldb_ch->panel);
 253 }
 254
 255 static void
 256 imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder,
 257                                 struct drm_crtc_state *crtc_state,
 258                                 struct drm_connector_state *connector_state)
 259 {
 260         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 261         struct drm_display_mode *mode = &crtc_state->adjusted_mode;
 262         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 263         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 264         unsigned long serial_clk;
 265         unsigned long di_clk = mode->clock * 1000;
 266         int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
 267         u32 bus_format = imx_ldb_ch->bus_format;
 268
 269         if (mode->clock > 170000) {
 270                 dev_warn(ldb->dev,
 271                          "%s: mode exceeds 170 MHz pixel clock\n", __func__);
 272         }
 273         if (mode->clock > 85000 && !dual) {
 274                 dev_warn(ldb->dev,
 275                          "%s: mode exceeds 85 MHz pixel clock\n", __func__);
 276         }
 277
 278         if (dual) {
 279                 serial_clk = 3500UL * mode->clock;
 280                 imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
 281                 imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk);
 282         } else {
 283                 serial_clk = 7000UL * mode->clock;
 284                 imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk,
 285                                   di_clk);
 286         }
 287
 288         /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
 289         if (imx_ldb_ch == &ldb->channel[0] || dual) {
 290                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 291                         ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
 292                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 293                         ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
 294         }
 295         if (imx_ldb_ch == &ldb->channel[1] || dual) {
 296                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 297                         ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
 298                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 299                         ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
 300         }
 301
 302         if (!bus_format) {
 303                 struct drm_connector *connector = connector_state->connector;
 304                 struct drm_display_info *di = &connector->display_info;
 305
 306                 if (di->num_bus_formats)
 307                         bus_format = di->bus_formats[0];
 308         }
 309         imx_ldb_ch_set_bus_format(imx_ldb_ch, bus_format);
 310 }
 311
 312 static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
 313 {
 314         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 315         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 316         int mux, ret;
 317
 318         /*
 319          * imx_ldb_encoder_disable is called by
 320          * drm_helper_disable_unused_functions without
 321          * the encoder being enabled before.
 322          */
 323         if (imx_ldb_ch == &ldb->channel[0] &&
 324             (ldb->ldb_ctrl & LDB_CH0_MODE_EN_MASK) == 0)
 325                 return;
 326         else if (imx_ldb_ch == &ldb->channel[1] &&
 327                  (ldb->ldb_ctrl & LDB_CH1_MODE_EN_MASK) == 0)
 328                 return;
 329
 330         drm_panel_disable(imx_ldb_ch->panel);
 331
 332         if (imx_ldb_ch == &ldb->channel[0])
 333                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
 334         else if (imx_ldb_ch == &ldb->channel[1])
 335                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
 336
 337         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
 338
 339         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
 340                 clk_disable_unprepare(ldb->clk[0]);
 341                 clk_disable_unprepare(ldb->clk[1]);
 342         }
 343
 344         if (ldb->lvds_mux) {
 345                 const struct bus_mux *lvds_mux = NULL;
 346
 347                 if (imx_ldb_ch == &ldb->channel[0])
 348                         lvds_mux = &ldb->lvds_mux[0];
 349                 else if (imx_ldb_ch == &ldb->channel[1])
 350                         lvds_mux = &ldb->lvds_mux[1];
 351
 352                 regmap_read(ldb->regmap, lvds_mux->reg, &mux);
 353                 mux &= lvds_mux->mask;
 354                 mux >>= lvds_mux->shift;
 355         } else {
 356                 mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
 357         }
 358
 359         /* set display clock mux back to original input clock */
 360         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
 361         if (ret)
 362                 dev_err(ldb->dev,
 363                         "unable to set di%d parent clock to original parent\n",
 364                         mux);
 365
 366         drm_panel_unprepare(imx_ldb_ch->panel);
 367 }
 368
 369 static int imx_ldb_encoder_atomic_check(struct drm_encoder *encoder,
 370                                         struct drm_crtc_state *crtc_state,
 371                                         struct drm_connector_state *conn_state)
 372 {
 373         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 374         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 375         struct drm_display_info *di = &conn_state->connector->display_info;
 376         u32 bus_format = imx_ldb_ch->bus_format;
 377
 378         /* Bus format description in DT overrides connector display info. */
 379         if (!bus_format && di->num_bus_formats) {
 380                 bus_format = di->bus_formats[0];
 381                 imx_crtc_state->bus_flags = di->bus_flags;
 382         } else {
 383                 bus_format = imx_ldb_ch->bus_format;
 384                 imx_crtc_state->bus_flags = imx_ldb_ch->bus_flags;
 385         }
 386         switch (bus_format) {
 387         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
 388                 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 389                 break;
 390         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
 391         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
 392                 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 393                 break;
 394         default:
 395                 return -EINVAL;
 396         }
 397
 398         imx_crtc_state->di_hsync_pin = 2;
 399         imx_crtc_state->di_vsync_pin = 3;
 400
 401         return 0;
 402 }
 403
 404
 405 static const struct drm_connector_funcs imx_ldb_connector_funcs = {
 406         .dpms = drm_atomic_helper_connector_dpms,
 407         .fill_modes = drm_helper_probe_single_connector_modes,
 408         .detect = imx_ldb_connector_detect,
 409         .destroy = imx_drm_connector_destroy,
 410         .reset = drm_atomic_helper_connector_reset,
 411         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 412         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 413 };
 414
 415 static const struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
 416         .get_modes = imx_ldb_connector_get_modes,
 417         .best_encoder = imx_ldb_connector_best_encoder,
 418 };
 419
 420 static const struct drm_encoder_funcs imx_ldb_encoder_funcs = {
 421         .destroy = imx_drm_encoder_destroy,
 422 };
 423
 424 static const struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
 425         .atomic_mode_set = imx_ldb_encoder_atomic_mode_set,
 426         .enable = imx_ldb_encoder_enable,
 427         .disable = imx_ldb_encoder_disable,
 428         .atomic_check = imx_ldb_encoder_atomic_check,
 429 };
 430
 431 static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
 432 {
 433         char clkname[16];
 434
 435         snprintf(clkname, sizeof(clkname), "di%d", chno);
 436         ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
 437         if (IS_ERR(ldb->clk[chno]))
 438                 return PTR_ERR(ldb->clk[chno]);
 439
 440         snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
 441         ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
 442
 443         return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
 444 }
 445
 446 static int imx_ldb_register(struct drm_device *drm,
 447         struct imx_ldb_channel *imx_ldb_ch)
 448 {
 449         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 450         struct drm_encoder *encoder = &imx_ldb_ch->encoder;
 451         int ret;
 452
 453         ret = imx_drm_encoder_parse_of(drm, encoder, imx_ldb_ch->child);
 454         if (ret)
 455                 return ret;
 456
 457         ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
 458         if (ret)
 459                 return ret;
 460
 461         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
 462                 ret = imx_ldb_get_clk(ldb, 1);
 463                 if (ret)
 464                         return ret;
 465         }
 466
 467         drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs);
 468         drm_encoder_init(drm, encoder, &imx_ldb_encoder_funcs,
 469                          DRM_MODE_ENCODER_LVDS, NULL);
 470
 471         drm_connector_helper_add(&imx_ldb_ch->connector,
 472                         &imx_ldb_connector_helper_funcs);
 473         drm_connector_init(drm, &imx_ldb_ch->connector,
 474                            &imx_ldb_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
 475
 476         if (imx_ldb_ch->panel) {
 477                 ret = drm_panel_attach(imx_ldb_ch->panel,
 478                                        &imx_ldb_ch->connector);
 479                 if (ret)
 480                         return ret;
 481         }
 482
 483         drm_mode_connector_attach_encoder(&imx_ldb_ch->connector, encoder);
 484
 485         return 0;
 486 }
 487
 488 enum {
 489         LVDS_BIT_MAP_SPWG,
 490         LVDS_BIT_MAP_JEIDA
 491 };
 492
 493 struct imx_ldb_bit_mapping {
 494         u32 bus_format;
 495         u32 datawidth;
 496         const char * const mapping;
 497 };
 498
 499 static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
 500         { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,  18, "spwg" },
 501         { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,  24, "spwg" },
 502         { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
 503 };
 504
 505 static u32 of_get_bus_format(struct device *dev, struct device_node *np)
 506 {
 507         const char *bm;
 508         u32 datawidth = 0;
 509         int ret, i;
 510
 511         ret = of_property_read_string(np, "fsl,data-mapping", &bm);
 512         if (ret < 0)
 513                 return ret;
 514
 515         of_property_read_u32(np, "fsl,data-width", &datawidth);
 516
 517         for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
 518                 if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
 519                     datawidth == imx_ldb_bit_mappings[i].datawidth)
 520                         return imx_ldb_bit_mappings[i].bus_format;
 521         }
 522
 523         dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
 524
 525         return -ENOENT;
 526 }
 527
 528 static struct bus_mux imx6q_lvds_mux[2] = {
 529         {
 530                 .reg = IOMUXC_GPR3,
 531                 .shift = 6,
 532                 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
 533         }, {
 534                 .reg = IOMUXC_GPR3,
 535                 .shift = 8,
 536                 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
 537         }
 538 };
 539
 540 /*
 541  * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
 542  * of_match_device will walk through this list and take the first entry
 543  * matching any of its compatible values. Therefore, the more generic
 544  * entries (in this case fsl,imx53-ldb) need to be ordered last.
 545  */
 546 static const struct of_device_id imx_ldb_dt_ids[] = {
 547         { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
 548         { .compatible = "fsl,imx53-ldb", .data = NULL, },
 549         { }
 550 };
 551 MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
 552
 553 static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 554 {
 555         struct drm_device *drm = data;
 556         struct device_node *np = dev->of_node;
 557         const struct of_device_id *of_id =
 558                         of_match_device(imx_ldb_dt_ids, dev);
 559         struct device_node *child;
 560         const u8 *edidp;
 561         struct imx_ldb *imx_ldb;
 562         int dual;
 563         int ret;
 564         int i;
 565
 566         imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
 567         if (!imx_ldb)
 568                 return -ENOMEM;
 569
 570         imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
 571         if (IS_ERR(imx_ldb->regmap)) {
 572                 dev_err(dev, "failed to get parent regmap\n");
 573                 return PTR_ERR(imx_ldb->regmap);
 574         }
 575
 576         imx_ldb->dev = dev;
 577
 578         if (of_id)
 579                 imx_ldb->lvds_mux = of_id->data;
 580
 581         dual = of_property_read_bool(np, "fsl,dual-channel");
 582         if (dual)
 583                 imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
 584
 585         /*
 586          * There are three different possible clock mux configurations:
 587          * i.MX53:  ipu1_di0_sel, ipu1_di1_sel
 588          * i.MX6q:  ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
 589          * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
 590          * Map them all to di0_sel...di3_sel.
 591          */
 592         for (i = 0; i < 4; i++) {
 593                 char clkname[16];
 594
 595                 sprintf(clkname, "di%d_sel", i);
 596                 imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
 597                 if (IS_ERR(imx_ldb->clk_sel[i])) {
 598                         ret = PTR_ERR(imx_ldb->clk_sel[i]);
 599                         imx_ldb->clk_sel[i] = NULL;
 600                         break;
 601                 }
 602
 603                 imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
 604         }
 605         if (i == 0)
 606                 return ret;
 607
 608         for_each_child_of_node(np, child) {
 609                 struct imx_ldb_channel *channel;
 610                 struct device_node *ddc_node;
 611                 struct device_node *ep;
 612                 int bus_format;
 613
 614                 ret = of_property_read_u32(child, "reg", &i);
 615                 if (ret || i < 0 || i > 1)
 616                         return -EINVAL;
 617
 618                 if (dual && i > 0) {
 619                         dev_warn(dev, "dual-channel mode, ignoring second output\n");
 620                         continue;
 621                 }
 622
 623                 if (!of_device_is_available(child))
 624                         continue;
 625
 626                 channel = &imx_ldb->channel[i];
 627                 channel->ldb = imx_ldb;
 628                 channel->chno = i;
 629                 channel->child = child;
 630
 631                 /*
 632                  * The output port is port@4 with an external 4-port mux or
 633                  * port@2 with the internal 2-port mux.
 634                  */
 635                 ep = of_graph_get_endpoint_by_regs(child,
 636                                                    imx_ldb->lvds_mux ? 4 : 2,
 637                                                    -1);
 638                 if (ep) {
 639                         struct device_node *remote;
 640
 641                         remote = of_graph_get_remote_port_parent(ep);
 642                         of_node_put(ep);
 643                         if (remote)
 644                                 channel->panel = of_drm_find_panel(remote);
 645                         else
 646                                 return -EPROBE_DEFER;
 647                         of_node_put(remote);
 648                         if (!channel->panel) {
 649                                 dev_err(dev, "panel not found: %s\n",
 650                                         remote->full_name);
 651                                 return -EPROBE_DEFER;
 652                         }
 653                 }
 654
 655                 ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0);
 656                 if (ddc_node) {
 657                         channel->ddc = of_find_i2c_adapter_by_node(ddc_node);
 658                         of_node_put(ddc_node);
 659                         if (!channel->ddc) {
 660                                 dev_warn(dev, "failed to get ddc i2c adapter\n");
 661                                 return -EPROBE_DEFER;
 662                         }
 663                 }
 664
 665                 if (!channel->ddc) {
 666                         /* if no DDC available, fallback to hardcoded EDID */
 667                         dev_dbg(dev, "no ddc available\n");
 668
 669                         edidp = of_get_property(child, "edid",
 670                                                 &channel->edid_len);
 671                         if (edidp) {
 672                                 channel->edid = kmemdup(edidp,
 673                                                         channel->edid_len,
 674                                                         GFP_KERNEL);
 675                         } else if (!channel->panel) {
 676                                 /* fallback to display-timings node */
 677                                 ret = of_get_drm_display_mode(child,
 678                                                               &channel->mode,
 679                                                               &channel->bus_flags,
 680                                                               OF_USE_NATIVE_MODE);
 681                                 if (!ret)
 682                                         channel->mode_valid = 1;
 683                         }
 684                 }
 685
 686                 bus_format = of_get_bus_format(dev, child);
 687                 if (bus_format == -EINVAL) {
 688                         /*
 689                          * If no bus format was specified in the device tree,
 690                          * we can still get it from the connected panel later.
 691                          */
 692                         if (channel->panel && channel->panel->funcs &&
 693                             channel->panel->funcs->get_modes)
 694                                 bus_format = 0;
 695                 }
 696                 if (bus_format < 0) {
 697                         dev_err(dev, "could not determine data mapping: %d\n",
 698                                 bus_format);
 699                         return bus_format;
 700                 }
 701                 channel->bus_format = bus_format;
 702
 703                 ret = imx_ldb_register(drm, channel);
 704                 if (ret)
 705                         return ret;
 706         }
 707
 708         dev_set_drvdata(dev, imx_ldb);
 709
 710         return 0;
 711 }
 712
 713 static void imx_ldb_unbind(struct device *dev, struct device *master,
 714         void *data)
 715 {
 716         struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
 717         int i;
 718
 719         for (i = 0; i < 2; i++) {
 720                 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
 721
 722                 if (!channel->connector.funcs)
 723                         continue;
 724
 725                 channel->connector.funcs->destroy(&channel->connector);
 726                 channel->encoder.funcs->destroy(&channel->encoder);
 727
 728                 kfree(channel->edid);
 729                 i2c_put_adapter(channel->ddc);
 730         }
 731 }
 732
 733 static const struct component_ops imx_ldb_ops = {
 734         .bind   = imx_ldb_bind,
 735         .unbind = imx_ldb_unbind,
 736 };
 737
 738 static int imx_ldb_probe(struct platform_device *pdev)
 739 {
 740         return component_add(&pdev->dev, &imx_ldb_ops);
 741 }
 742
 743 static int imx_ldb_remove(struct platform_device *pdev)
 744 {
 745         component_del(&pdev->dev, &imx_ldb_ops);
 746         return 0;
 747 }
 748
 749 static struct platform_driver imx_ldb_driver = {
 750         .probe          = imx_ldb_probe,
 751         .remove         = imx_ldb_remove,
 752         .driver         = {
 753                 .of_match_table = imx_ldb_dt_ids,
 754                 .name   = DRIVER_NAME,
 755         },
 756 };
 757
 758 module_platform_driver(imx_ldb_driver);
 759
 760 MODULE_DESCRIPTION("i.MX LVDS driver");
 761 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 762 MODULE_LICENSE("GPL");
 763 MODULE_ALIAS("platform:" DRIVER_NAME);