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
  61         /* Defines what is connected to the ldb, only one at a time */
  62         struct drm_panel *panel;
  63         struct drm_bridge *bridge;
  64
  65         struct device_node *child;
  66         struct i2c_adapter *ddc;
  67         int chno;
  68         void *edid;
  69         int edid_len;
  70         struct drm_display_mode mode;
  71         int mode_valid;
  72         u32 bus_format;
  73         u32 bus_flags;
  74 };
  75
  76 static inline struct imx_ldb_channel *con_to_imx_ldb_ch(struct drm_connector *c)
  77 {
  78         return container_of(c, struct imx_ldb_channel, connector);
  79 }
  80
  81 static inline struct imx_ldb_channel *enc_to_imx_ldb_ch(struct drm_encoder *e)
  82 {
  83         return container_of(e, struct imx_ldb_channel, encoder);
  84 }
  85
  86 struct bus_mux {
  87         int reg;
  88         int shift;
  89         int mask;
  90 };
  91
  92 struct imx_ldb {
  93         struct regmap *regmap;
  94         struct device *dev;
  95         struct imx_ldb_channel channel[2];
  96         struct clk *clk[2]; /* our own clock */
  97         struct clk *clk_sel[4]; /* parent of display clock */
  98         struct clk *clk_parent[4]; /* original parent of clk_sel */
  99         struct clk *clk_pll[2]; /* upstream clock we can adjust */
 100         u32 ldb_ctrl;
 101         const struct bus_mux *lvds_mux;
 102 };
 103
 104 static enum drm_connector_status imx_ldb_connector_detect(
 105                 struct drm_connector *connector, bool force)
 106 {
 107         return connector_status_connected;
 108 }
 109
 110 static void imx_ldb_ch_set_bus_format(struct imx_ldb_channel *imx_ldb_ch,
 111                                       u32 bus_format)
 112 {
 113         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 114         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 115
 116         switch (bus_format) {
 117         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
 118                 break;
 119         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
 120                 if (imx_ldb_ch->chno == 0 || dual)
 121                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
 122                 if (imx_ldb_ch->chno == 1 || dual)
 123                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
 124                 break;
 125         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
 126                 if (imx_ldb_ch->chno == 0 || dual)
 127                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
 128                                          LDB_BIT_MAP_CH0_JEIDA;
 129                 if (imx_ldb_ch->chno == 1 || dual)
 130                         ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
 131                                          LDB_BIT_MAP_CH1_JEIDA;
 132                 break;
 133         }
 134 }
 135
 136 static int imx_ldb_connector_get_modes(struct drm_connector *connector)
 137 {
 138         struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
 139         int num_modes = 0;
 140
 141         if (imx_ldb_ch->panel && imx_ldb_ch->panel->funcs &&
 142             imx_ldb_ch->panel->funcs->get_modes) {
 143                 num_modes = imx_ldb_ch->panel->funcs->get_modes(imx_ldb_ch->panel);
 144                 if (num_modes > 0)
 145                         return num_modes;
 146         }
 147
 148         if (!imx_ldb_ch->edid && imx_ldb_ch->ddc)
 149                 imx_ldb_ch->edid = drm_get_edid(connector, imx_ldb_ch->ddc);
 150
 151         if (imx_ldb_ch->edid) {
 152                 drm_mode_connector_update_edid_property(connector,
 153                                                         imx_ldb_ch->edid);
 154                 num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid);
 155         }
 156
 157         if (imx_ldb_ch->mode_valid) {
 158                 struct drm_display_mode *mode;
 159
 160                 mode = drm_mode_create(connector->dev);
 161                 if (!mode)
 162                         return -EINVAL;
 163                 drm_mode_copy(mode, &imx_ldb_ch->mode);
 164                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 165                 drm_mode_probed_add(connector, mode);
 166                 num_modes++;
 167         }
 168
 169         return num_modes;
 170 }
 171
 172 static struct drm_encoder *imx_ldb_connector_best_encoder(
 173                 struct drm_connector *connector)
 174 {
 175         struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
 176
 177         return &imx_ldb_ch->encoder;
 178 }
 179
 180 static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
 181                 unsigned long serial_clk, unsigned long di_clk)
 182 {
 183         int ret;
 184
 185         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
 186                         clk_get_rate(ldb->clk_pll[chno]), serial_clk);
 187         clk_set_rate(ldb->clk_pll[chno], serial_clk);
 188
 189         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
 190                         clk_get_rate(ldb->clk_pll[chno]));
 191
 192         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
 193                         clk_get_rate(ldb->clk[chno]),
 194                         (long int)di_clk);
 195         clk_set_rate(ldb->clk[chno], di_clk);
 196
 197         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
 198                         clk_get_rate(ldb->clk[chno]));
 199
 200         /* set display clock mux to LDB input clock */
 201         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]);
 202         if (ret)
 203                 dev_err(ldb->dev,
 204                         "unable to set di%d parent clock to ldb_di%d\n", mux,
 205                         chno);
 206 }
 207
 208 static void imx_ldb_encoder_enable(struct drm_encoder *encoder)
 209 {
 210         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 211         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 212         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 213         int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
 214
 215         if (mux < 0 || mux >= ARRAY_SIZE(ldb->clk_sel)) {
 216                 dev_warn(ldb->dev, "%s: invalid mux %d\n", __func__, mux);
 217                 return;
 218         }
 219
 220         drm_panel_prepare(imx_ldb_ch->panel);
 221
 222         if (dual) {
 223                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[0]);
 224                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[1]);
 225
 226                 clk_prepare_enable(ldb->clk[0]);
 227                 clk_prepare_enable(ldb->clk[1]);
 228         } else {
 229                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[imx_ldb_ch->chno]);
 230         }
 231
 232         if (imx_ldb_ch == &ldb->channel[0] || dual) {
 233                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
 234                 if (mux == 0 || ldb->lvds_mux)
 235                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
 236                 else if (mux == 1)
 237                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
 238         }
 239         if (imx_ldb_ch == &ldb->channel[1] || dual) {
 240                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
 241                 if (mux == 1 || ldb->lvds_mux)
 242                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
 243                 else if (mux == 0)
 244                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
 245         }
 246
 247         if (ldb->lvds_mux) {
 248                 const struct bus_mux *lvds_mux = NULL;
 249
 250                 if (imx_ldb_ch == &ldb->channel[0])
 251                         lvds_mux = &ldb->lvds_mux[0];
 252                 else if (imx_ldb_ch == &ldb->channel[1])
 253                         lvds_mux = &ldb->lvds_mux[1];
 254
 255                 regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
 256                                    mux << lvds_mux->shift);
 257         }
 258
 259         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
 260
 261         drm_panel_enable(imx_ldb_ch->panel);
 262 }
 263
 264 static void
 265 imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder,
 266                                 struct drm_crtc_state *crtc_state,
 267                                 struct drm_connector_state *connector_state)
 268 {
 269         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 270         struct drm_display_mode *mode = &crtc_state->adjusted_mode;
 271         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 272         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 273         unsigned long serial_clk;
 274         unsigned long di_clk = mode->clock * 1000;
 275         int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
 276         u32 bus_format = imx_ldb_ch->bus_format;
 277
 278         if (mux < 0 || mux >= ARRAY_SIZE(ldb->clk_sel)) {
 279                 dev_warn(ldb->dev, "%s: invalid mux %d\n", __func__, mux);
 280                 return;
 281         }
 282
 283         if (mode->clock > 170000) {
 284                 dev_warn(ldb->dev,
 285                          "%s: mode exceeds 170 MHz pixel clock\n", __func__);
 286         }
 287         if (mode->clock > 85000 && !dual) {
 288                 dev_warn(ldb->dev,
 289                          "%s: mode exceeds 85 MHz pixel clock\n", __func__);
 290         }
 291
 292         if (dual) {
 293                 serial_clk = 3500UL * mode->clock;
 294                 imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
 295                 imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk);
 296         } else {
 297                 serial_clk = 7000UL * mode->clock;
 298                 imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk,
 299                                   di_clk);
 300         }
 301
 302         /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
 303         if (imx_ldb_ch == &ldb->channel[0] || dual) {
 304                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 305                         ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
 306                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 307                         ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
 308         }
 309         if (imx_ldb_ch == &ldb->channel[1] || dual) {
 310                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 311                         ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
 312                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 313                         ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
 314         }
 315
 316         if (!bus_format) {
 317                 struct drm_connector *connector = connector_state->connector;
 318                 struct drm_display_info *di = &connector->display_info;
 319
 320                 if (di->num_bus_formats)
 321                         bus_format = di->bus_formats[0];
 322         }
 323         imx_ldb_ch_set_bus_format(imx_ldb_ch, bus_format);
 324 }
 325
 326 static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
 327 {
 328         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 329         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 330         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 331         int mux, ret;
 332
 333         /*
 334          * imx_ldb_encoder_disable is called by
 335          * drm_helper_disable_unused_functions without
 336          * the encoder being enabled before.
 337          */
 338         if (imx_ldb_ch == &ldb->channel[0] &&
 339             (ldb->ldb_ctrl & LDB_CH0_MODE_EN_MASK) == 0)
 340                 return;
 341         else if (imx_ldb_ch == &ldb->channel[1] &&
 342                  (ldb->ldb_ctrl & LDB_CH1_MODE_EN_MASK) == 0)
 343                 return;
 344
 345         drm_panel_disable(imx_ldb_ch->panel);
 346
 347         if (imx_ldb_ch == &ldb->channel[0] || dual)
 348                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
 349         if (imx_ldb_ch == &ldb->channel[1] || dual)
 350                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
 351
 352         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
 353
 354         if (dual) {
 355                 clk_disable_unprepare(ldb->clk[0]);
 356                 clk_disable_unprepare(ldb->clk[1]);
 357         }
 358
 359         if (ldb->lvds_mux) {
 360                 const struct bus_mux *lvds_mux = NULL;
 361
 362                 if (imx_ldb_ch == &ldb->channel[0])
 363                         lvds_mux = &ldb->lvds_mux[0];
 364                 else if (imx_ldb_ch == &ldb->channel[1])
 365                         lvds_mux = &ldb->lvds_mux[1];
 366
 367                 regmap_read(ldb->regmap, lvds_mux->reg, &mux);
 368                 mux &= lvds_mux->mask;
 369                 mux >>= lvds_mux->shift;
 370         } else {
 371                 mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
 372         }
 373
 374         /* set display clock mux back to original input clock */
 375         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
 376         if (ret)
 377                 dev_err(ldb->dev,
 378                         "unable to set di%d parent clock to original parent\n",
 379                         mux);
 380
 381         drm_panel_unprepare(imx_ldb_ch->panel);
 382 }
 383
 384 static int imx_ldb_encoder_atomic_check(struct drm_encoder *encoder,
 385                                         struct drm_crtc_state *crtc_state,
 386                                         struct drm_connector_state *conn_state)
 387 {
 388         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 389         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 390         struct drm_display_info *di = &conn_state->connector->display_info;
 391         u32 bus_format = imx_ldb_ch->bus_format;
 392
 393         /* Bus format description in DT overrides connector display info. */
 394         if (!bus_format && di->num_bus_formats) {
 395                 bus_format = di->bus_formats[0];
 396                 imx_crtc_state->bus_flags = di->bus_flags;
 397         } else {
 398                 bus_format = imx_ldb_ch->bus_format;
 399                 imx_crtc_state->bus_flags = imx_ldb_ch->bus_flags;
 400         }
 401         switch (bus_format) {
 402         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
 403                 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 404                 break;
 405         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
 406         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
 407                 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 408                 break;
 409         default:
 410                 return -EINVAL;
 411         }
 412
 413         imx_crtc_state->di_hsync_pin = 2;
 414         imx_crtc_state->di_vsync_pin = 3;
 415
 416         return 0;
 417 }
 418
 419
 420 static const struct drm_connector_funcs imx_ldb_connector_funcs = {
 421         .dpms = drm_atomic_helper_connector_dpms,
 422         .fill_modes = drm_helper_probe_single_connector_modes,
 423         .detect = imx_ldb_connector_detect,
 424         .destroy = imx_drm_connector_destroy,
 425         .reset = drm_atomic_helper_connector_reset,
 426         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 427         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 428 };
 429
 430 static const struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
 431         .get_modes = imx_ldb_connector_get_modes,
 432         .best_encoder = imx_ldb_connector_best_encoder,
 433 };
 434
 435 static const struct drm_encoder_funcs imx_ldb_encoder_funcs = {
 436         .destroy = imx_drm_encoder_destroy,
 437 };
 438
 439 static const struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
 440         .atomic_mode_set = imx_ldb_encoder_atomic_mode_set,
 441         .enable = imx_ldb_encoder_enable,
 442         .disable = imx_ldb_encoder_disable,
 443         .atomic_check = imx_ldb_encoder_atomic_check,
 444 };
 445
 446 static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
 447 {
 448         char clkname[16];
 449
 450         snprintf(clkname, sizeof(clkname), "di%d", chno);
 451         ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
 452         if (IS_ERR(ldb->clk[chno]))
 453                 return PTR_ERR(ldb->clk[chno]);
 454
 455         snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
 456         ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
 457
 458         return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
 459 }
 460
 461 static int imx_ldb_register(struct drm_device *drm,
 462         struct imx_ldb_channel *imx_ldb_ch)
 463 {
 464         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 465         struct drm_encoder *encoder = &imx_ldb_ch->encoder;
 466         int ret;
 467
 468         ret = imx_drm_encoder_parse_of(drm, encoder, imx_ldb_ch->child);
 469         if (ret)
 470                 return ret;
 471
 472         ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
 473         if (ret)
 474                 return ret;
 475
 476         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
 477                 ret = imx_ldb_get_clk(ldb, 1);
 478                 if (ret)
 479                         return ret;
 480         }
 481
 482         drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs);
 483         drm_encoder_init(drm, encoder, &imx_ldb_encoder_funcs,
 484                          DRM_MODE_ENCODER_LVDS, NULL);
 485
 486         if (imx_ldb_ch->bridge) {
 487                 imx_ldb_ch->bridge->encoder = encoder;
 488
 489                 imx_ldb_ch->encoder.bridge = imx_ldb_ch->bridge;
 490                 ret = drm_bridge_attach(drm, imx_ldb_ch->bridge);
 491                 if (ret) {
 492                         DRM_ERROR("Failed to initialize bridge with drm\n");
 493                         return ret;
 494                 }
 495         } else {
 496                 /*
 497                  * We want to add the connector whenever there is no bridge
 498                  * that brings its own, not only when there is a panel. For
 499                  * historical reasons, the ldb driver can also work without
 500                  * a panel.
 501                  */
 502                 drm_connector_helper_add(&imx_ldb_ch->connector,
 503                                 &imx_ldb_connector_helper_funcs);
 504                 drm_connector_init(drm, &imx_ldb_ch->connector,
 505                                 &imx_ldb_connector_funcs,
 506                                 DRM_MODE_CONNECTOR_LVDS);
 507                 drm_mode_connector_attach_encoder(&imx_ldb_ch->connector,
 508                                 encoder);
 509         }
 510
 511         if (imx_ldb_ch->panel) {
 512                 ret = drm_panel_attach(imx_ldb_ch->panel,
 513                                        &imx_ldb_ch->connector);
 514                 if (ret)
 515                         return ret;
 516         }
 517
 518         return 0;
 519 }
 520
 521 enum {
 522         LVDS_BIT_MAP_SPWG,
 523         LVDS_BIT_MAP_JEIDA
 524 };
 525
 526 struct imx_ldb_bit_mapping {
 527         u32 bus_format;
 528         u32 datawidth;
 529         const char * const mapping;
 530 };
 531
 532 static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
 533         { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,  18, "spwg" },
 534         { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,  24, "spwg" },
 535         { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
 536 };
 537
 538 static u32 of_get_bus_format(struct device *dev, struct device_node *np)
 539 {
 540         const char *bm;
 541         u32 datawidth = 0;
 542         int ret, i;
 543
 544         ret = of_property_read_string(np, "fsl,data-mapping", &bm);
 545         if (ret < 0)
 546                 return ret;
 547
 548         of_property_read_u32(np, "fsl,data-width", &datawidth);
 549
 550         for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
 551                 if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
 552                     datawidth == imx_ldb_bit_mappings[i].datawidth)
 553                         return imx_ldb_bit_mappings[i].bus_format;
 554         }
 555
 556         dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
 557
 558         return -ENOENT;
 559 }
 560
 561 static struct bus_mux imx6q_lvds_mux[2] = {
 562         {
 563                 .reg = IOMUXC_GPR3,
 564                 .shift = 6,
 565                 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
 566         }, {
 567                 .reg = IOMUXC_GPR3,
 568                 .shift = 8,
 569                 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
 570         }
 571 };
 572
 573 /*
 574  * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
 575  * of_match_device will walk through this list and take the first entry
 576  * matching any of its compatible values. Therefore, the more generic
 577  * entries (in this case fsl,imx53-ldb) need to be ordered last.
 578  */
 579 static const struct of_device_id imx_ldb_dt_ids[] = {
 580         { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
 581         { .compatible = "fsl,imx53-ldb", .data = NULL, },
 582         { }
 583 };
 584 MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
 585
 586 static int imx_ldb_panel_ddc(struct device *dev,
 587                 struct imx_ldb_channel *channel, struct device_node *child)
 588 {
 589         struct device_node *ddc_node;
 590         const u8 *edidp;
 591         int ret;
 592
 593         ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0);
 594         if (ddc_node) {
 595                 channel->ddc = of_find_i2c_adapter_by_node(ddc_node);
 596                 of_node_put(ddc_node);
 597                 if (!channel->ddc) {
 598                         dev_warn(dev, "failed to get ddc i2c adapter\n");
 599                         return -EPROBE_DEFER;
 600                 }
 601         }
 602
 603         if (!channel->ddc) {
 604                 /* if no DDC available, fallback to hardcoded EDID */
 605                 dev_dbg(dev, "no ddc available\n");
 606
 607                 edidp = of_get_property(child, "edid",
 608                                         &channel->edid_len);
 609                 if (edidp) {
 610                         channel->edid = kmemdup(edidp,
 611                                                 channel->edid_len,
 612                                                 GFP_KERNEL);
 613                 } else if (!channel->panel) {
 614                         /* fallback to display-timings node */
 615                         ret = of_get_drm_display_mode(child,
 616                                                       &channel->mode,
 617                                                       &channel->bus_flags,
 618                                                       OF_USE_NATIVE_MODE);
 619                         if (!ret)
 620                                 channel->mode_valid = 1;
 621                 }
 622         }
 623         return 0;
 624 }
 625
 626 static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 627 {
 628         struct drm_device *drm = data;
 629         struct device_node *np = dev->of_node;
 630         const struct of_device_id *of_id =
 631                         of_match_device(imx_ldb_dt_ids, dev);
 632         struct device_node *child;
 633         struct imx_ldb *imx_ldb;
 634         int dual;
 635         int ret;
 636         int i;
 637
 638         imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
 639         if (!imx_ldb)
 640                 return -ENOMEM;
 641
 642         imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
 643         if (IS_ERR(imx_ldb->regmap)) {
 644                 dev_err(dev, "failed to get parent regmap\n");
 645                 return PTR_ERR(imx_ldb->regmap);
 646         }
 647
 648         /* disable LDB by resetting the control register to POR default */
 649         regmap_write(imx_ldb->regmap, IOMUXC_GPR2, 0);
 650
 651         imx_ldb->dev = dev;
 652
 653         if (of_id)
 654                 imx_ldb->lvds_mux = of_id->data;
 655
 656         dual = of_property_read_bool(np, "fsl,dual-channel");
 657         if (dual)
 658                 imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
 659
 660         /*
 661          * There are three different possible clock mux configurations:
 662          * i.MX53:  ipu1_di0_sel, ipu1_di1_sel
 663          * i.MX6q:  ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
 664          * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
 665          * Map them all to di0_sel...di3_sel.
 666          */
 667         for (i = 0; i < 4; i++) {
 668                 char clkname[16];
 669
 670                 sprintf(clkname, "di%d_sel", i);
 671                 imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
 672                 if (IS_ERR(imx_ldb->clk_sel[i])) {
 673                         ret = PTR_ERR(imx_ldb->clk_sel[i]);
 674                         imx_ldb->clk_sel[i] = NULL;
 675                         break;
 676                 }
 677
 678                 imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
 679         }
 680         if (i == 0)
 681                 return ret;
 682
 683         for_each_child_of_node(np, child) {
 684                 struct imx_ldb_channel *channel;
 685                 struct device_node *ep;
 686                 int bus_format;
 687
 688                 ret = of_property_read_u32(child, "reg", &i);
 689                 if (ret || i < 0 || i > 1)
 690                         return -EINVAL;
 691
 692                 if (!of_device_is_available(child))
 693                         continue;
 694
 695                 if (dual && i > 0) {
 696                         dev_warn(dev, "dual-channel mode, ignoring second output\n");
 697                         continue;
 698                 }
 699
 700                 channel = &imx_ldb->channel[i];
 701                 channel->ldb = imx_ldb;
 702                 channel->chno = i;
 703                 channel->child = child;
 704
 705                 /*
 706                  * The output port is port@4 with an external 4-port mux or
 707                  * port@2 with the internal 2-port mux.
 708                  */
 709                 ep = of_graph_get_endpoint_by_regs(child,
 710                                                    imx_ldb->lvds_mux ? 4 : 2,
 711                                                    -1);
 712                 if (ep) {
 713                         struct device_node *remote;
 714
 715                         remote = of_graph_get_remote_port_parent(ep);
 716                         of_node_put(ep);
 717                         if (remote) {
 718                                 channel->panel = of_drm_find_panel(remote);
 719                                 channel->bridge = of_drm_find_bridge(remote);
 720                         } else
 721                                 return -EPROBE_DEFER;
 722                         of_node_put(remote);
 723
 724                         if (!channel->panel && !channel->bridge) {
 725                                 dev_err(dev, "panel/bridge not found: %s\n",
 726                                         remote->full_name);
 727                                 return -EPROBE_DEFER;
 728                         }
 729                 }
 730
 731                 /* panel ddc only if there is no bridge */
 732                 if (!channel->bridge) {
 733                         ret = imx_ldb_panel_ddc(dev, channel, child);
 734                         if (ret)
 735                                 return ret;
 736                 }
 737
 738                 bus_format = of_get_bus_format(dev, child);
 739                 if (bus_format == -EINVAL) {
 740                         /*
 741                          * If no bus format was specified in the device tree,
 742                          * we can still get it from the connected panel later.
 743                          */
 744                         if (channel->panel && channel->panel->funcs &&
 745                             channel->panel->funcs->get_modes)
 746                                 bus_format = 0;
 747                 }
 748                 if (bus_format < 0) {
 749                         dev_err(dev, "could not determine data mapping: %d\n",
 750                                 bus_format);
 751                         return bus_format;
 752                 }
 753                 channel->bus_format = bus_format;
 754
 755                 ret = imx_ldb_register(drm, channel);
 756                 if (ret)
 757                         return ret;
 758         }
 759
 760         dev_set_drvdata(dev, imx_ldb);
 761
 762         return 0;
 763 }
 764
 765 static void imx_ldb_unbind(struct device *dev, struct device *master,
 766         void *data)
 767 {
 768         struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
 769         int i;
 770
 771         for (i = 0; i < 2; i++) {
 772                 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
 773
 774                 if (channel->bridge)
 775                         drm_bridge_detach(channel->bridge);
 776                 if (channel->panel)
 777                         drm_panel_detach(channel->panel);
 778
 779                 kfree(channel->edid);
 780                 i2c_put_adapter(channel->ddc);
 781         }
 782 }
 783
 784 static const struct component_ops imx_ldb_ops = {
 785         .bind   = imx_ldb_bind,
 786         .unbind = imx_ldb_unbind,
 787 };
 788
 789 static int imx_ldb_probe(struct platform_device *pdev)
 790 {
 791         return component_add(&pdev->dev, &imx_ldb_ops);
 792 }
 793
 794 static int imx_ldb_remove(struct platform_device *pdev)
 795 {
 796         component_del(&pdev->dev, &imx_ldb_ops);
 797         return 0;
 798 }
 799
 800 static struct platform_driver imx_ldb_driver = {
 801         .probe          = imx_ldb_probe,
 802         .remove         = imx_ldb_remove,
 803         .driver         = {
 804                 .of_match_table = imx_ldb_dt_ids,
 805                 .name   = DRIVER_NAME,
 806         },
 807 };
 808
 809 module_platform_driver(imx_ldb_driver);
 810
 811 MODULE_DESCRIPTION("i.MX LVDS driver");
 812 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 813 MODULE_LICENSE("GPL");
 814 MODULE_ALIAS("platform:" DRIVER_NAME);