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