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