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 *connector;
 301
 302                 drm_for_each_connector(connector, encoder->dev) {
 303                         struct drm_display_info *di = &connector->display_info;
 304
 305                         if (connector->encoder == encoder &&
 306                             di->num_bus_formats) {
 307                                 bus_format = di->bus_formats[0];
 308                                 break;
 309                         }
 310                 }
 311         }
 312         imx_ldb_ch_set_bus_format(imx_ldb_ch, bus_format);
 313 }
 314
 315 static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
 316 {
 317         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 318         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 319         int mux, ret;
 320
 321         /*
 322          * imx_ldb_encoder_disable is called by
 323          * drm_helper_disable_unused_functions without
 324          * the encoder being enabled before.
 325          */
 326         if (imx_ldb_ch == &ldb->channel[0] &&
 327             (ldb->ldb_ctrl & LDB_CH0_MODE_EN_MASK) == 0)
 328                 return;
 329         else if (imx_ldb_ch == &ldb->channel[1] &&
 330                  (ldb->ldb_ctrl & LDB_CH1_MODE_EN_MASK) == 0)
 331                 return;
 332
 333         drm_panel_disable(imx_ldb_ch->panel);
 334
 335         if (imx_ldb_ch == &ldb->channel[0])
 336                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
 337         else if (imx_ldb_ch == &ldb->channel[1])
 338                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
 339
 340         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
 341
 342         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
 343                 clk_disable_unprepare(ldb->clk[0]);
 344                 clk_disable_unprepare(ldb->clk[1]);
 345         }
 346
 347         if (ldb->lvds_mux) {
 348                 const struct bus_mux *lvds_mux = NULL;
 349
 350                 if (imx_ldb_ch == &ldb->channel[0])
 351                         lvds_mux = &ldb->lvds_mux[0];
 352                 else if (imx_ldb_ch == &ldb->channel[1])
 353                         lvds_mux = &ldb->lvds_mux[1];
 354
 355                 regmap_read(ldb->regmap, lvds_mux->reg, &mux);
 356                 mux &= lvds_mux->mask;
 357                 mux >>= lvds_mux->shift;
 358         } else {
 359                 mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
 360         }
 361
 362         /* set display clock mux back to original input clock */
 363         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
 364         if (ret)
 365                 dev_err(ldb->dev,
 366                         "unable to set di%d parent clock to original parent\n",
 367                         mux);
 368
 369         drm_panel_unprepare(imx_ldb_ch->panel);
 370 }
 371
 372 static int imx_ldb_encoder_atomic_check(struct drm_encoder *encoder,
 373                                         struct drm_crtc_state *crtc_state,
 374                                         struct drm_connector_state *conn_state)
 375 {
 376         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 377         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 378         struct drm_display_info *di = &conn_state->connector->display_info;
 379         u32 bus_format = imx_ldb_ch->bus_format;
 380
 381         /* Bus format description in DT overrides connector display info. */
 382         if (!bus_format && di->num_bus_formats)
 383                 bus_format = di->bus_formats[0];
 384         switch (bus_format) {
 385         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
 386                 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
 387                 break;
 388         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
 389         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
 390                 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 391                 break;
 392         default:
 393                 return -EINVAL;
 394         }
 395
 396         imx_crtc_state->di_hsync_pin = 2;
 397         imx_crtc_state->di_vsync_pin = 3;
 398
 399         return 0;
 400 }
 401
 402
 403 static const struct drm_connector_funcs imx_ldb_connector_funcs = {
 404         .dpms = drm_atomic_helper_connector_dpms,
 405         .fill_modes = drm_helper_probe_single_connector_modes,
 406         .detect = imx_ldb_connector_detect,
 407         .destroy = imx_drm_connector_destroy,
 408         .reset = drm_atomic_helper_connector_reset,
 409         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 410         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 411 };
 412
 413 static const struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
 414         .get_modes = imx_ldb_connector_get_modes,
 415         .best_encoder = imx_ldb_connector_best_encoder,
 416 };
 417
 418 static const struct drm_encoder_funcs imx_ldb_encoder_funcs = {
 419         .destroy = imx_drm_encoder_destroy,
 420 };
 421
 422 static const struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
 423         .mode_set = imx_ldb_encoder_mode_set,
 424         .enable = imx_ldb_encoder_enable,
 425         .disable = imx_ldb_encoder_disable,
 426         .atomic_check = imx_ldb_encoder_atomic_check,
 427 };
 428
 429 static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
 430 {
 431         char clkname[16];
 432
 433         snprintf(clkname, sizeof(clkname), "di%d", chno);
 434         ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
 435         if (IS_ERR(ldb->clk[chno]))
 436                 return PTR_ERR(ldb->clk[chno]);
 437
 438         snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
 439         ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
 440
 441         return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
 442 }
 443
 444 static int imx_ldb_register(struct drm_device *drm,
 445         struct imx_ldb_channel *imx_ldb_ch)
 446 {
 447         struct imx_ldb *ldb = imx_ldb_ch->ldb;
 448         struct drm_encoder *encoder = &imx_ldb_ch->encoder;
 449         int ret;
 450
 451         ret = imx_drm_encoder_parse_of(drm, encoder, imx_ldb_ch->child);
 452         if (ret)
 453                 return ret;
 454
 455         ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
 456         if (ret)
 457                 return ret;
 458
 459         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
 460                 ret = imx_ldb_get_clk(ldb, 1);
 461                 if (ret)
 462                         return ret;
 463         }
 464
 465         drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs);
 466         drm_encoder_init(drm, encoder, &imx_ldb_encoder_funcs,
 467                          DRM_MODE_ENCODER_LVDS, NULL);
 468
 469         drm_connector_helper_add(&imx_ldb_ch->connector,
 470                         &imx_ldb_connector_helper_funcs);
 471         drm_connector_init(drm, &imx_ldb_ch->connector,
 472                            &imx_ldb_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
 473
 474         if (imx_ldb_ch->panel) {
 475                 ret = drm_panel_attach(imx_ldb_ch->panel,
 476                                        &imx_ldb_ch->connector);
 477                 if (ret)
 478                         return ret;
 479         }
 480
 481         drm_mode_connector_attach_encoder(&imx_ldb_ch->connector, encoder);
 482
 483         return 0;
 484 }
 485
 486 enum {
 487         LVDS_BIT_MAP_SPWG,
 488         LVDS_BIT_MAP_JEIDA
 489 };
 490
 491 struct imx_ldb_bit_mapping {
 492         u32 bus_format;
 493         u32 datawidth;
 494         const char * const mapping;
 495 };
 496
 497 static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
 498         { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,  18, "spwg" },
 499         { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,  24, "spwg" },
 500         { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
 501 };
 502
 503 static u32 of_get_bus_format(struct device *dev, struct device_node *np)
 504 {
 505         const char *bm;
 506         u32 datawidth = 0;
 507         int ret, i;
 508
 509         ret = of_property_read_string(np, "fsl,data-mapping", &bm);
 510         if (ret < 0)
 511                 return ret;
 512
 513         of_property_read_u32(np, "fsl,data-width", &datawidth);
 514
 515         for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
 516                 if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
 517                     datawidth == imx_ldb_bit_mappings[i].datawidth)
 518                         return imx_ldb_bit_mappings[i].bus_format;
 519         }
 520
 521         dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
 522
 523         return -ENOENT;
 524 }
 525
 526 static struct bus_mux imx6q_lvds_mux[2] = {
 527         {
 528                 .reg = IOMUXC_GPR3,
 529                 .shift = 6,
 530                 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
 531         }, {
 532                 .reg = IOMUXC_GPR3,
 533                 .shift = 8,
 534                 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
 535         }
 536 };
 537
 538 /*
 539  * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
 540  * of_match_device will walk through this list and take the first entry
 541  * matching any of its compatible values. Therefore, the more generic
 542  * entries (in this case fsl,imx53-ldb) need to be ordered last.
 543  */
 544 static const struct of_device_id imx_ldb_dt_ids[] = {
 545         { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
 546         { .compatible = "fsl,imx53-ldb", .data = NULL, },
 547         { }
 548 };
 549 MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
 550
 551 static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 552 {
 553         struct drm_device *drm = data;
 554         struct device_node *np = dev->of_node;
 555         const struct of_device_id *of_id =
 556                         of_match_device(imx_ldb_dt_ids, dev);
 557         struct device_node *child;
 558         const u8 *edidp;
 559         struct imx_ldb *imx_ldb;
 560         int dual;
 561         int ret;
 562         int i;
 563
 564         imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
 565         if (!imx_ldb)
 566                 return -ENOMEM;
 567
 568         imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
 569         if (IS_ERR(imx_ldb->regmap)) {
 570                 dev_err(dev, "failed to get parent regmap\n");
 571                 return PTR_ERR(imx_ldb->regmap);
 572         }
 573
 574         imx_ldb->dev = dev;
 575
 576         if (of_id)
 577                 imx_ldb->lvds_mux = of_id->data;
 578
 579         dual = of_property_read_bool(np, "fsl,dual-channel");
 580         if (dual)
 581                 imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
 582
 583         /*
 584          * There are three different possible clock mux configurations:
 585          * i.MX53:  ipu1_di0_sel, ipu1_di1_sel
 586          * i.MX6q:  ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
 587          * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
 588          * Map them all to di0_sel...di3_sel.
 589          */
 590         for (i = 0; i < 4; i++) {
 591                 char clkname[16];
 592
 593                 sprintf(clkname, "di%d_sel", i);
 594                 imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
 595                 if (IS_ERR(imx_ldb->clk_sel[i])) {
 596                         ret = PTR_ERR(imx_ldb->clk_sel[i]);
 597                         imx_ldb->clk_sel[i] = NULL;
 598                         break;
 599                 }
 600
 601                 imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
 602         }
 603         if (i == 0)
 604                 return ret;
 605
 606         for_each_child_of_node(np, child) {
 607                 struct imx_ldb_channel *channel;
 608                 struct device_node *ddc_node;
 609                 struct device_node *ep;
 610                 int bus_format;
 611
 612                 ret = of_property_read_u32(child, "reg", &i);
 613                 if (ret || i < 0 || i > 1)
 614                         return -EINVAL;
 615
 616                 if (dual && i > 0) {
 617                         dev_warn(dev, "dual-channel mode, ignoring second output\n");
 618                         continue;
 619                 }
 620
 621                 if (!of_device_is_available(child))
 622                         continue;
 623
 624                 channel = &imx_ldb->channel[i];
 625                 channel->ldb = imx_ldb;
 626                 channel->chno = i;
 627                 channel->child = child;
 628
 629                 /*
 630                  * The output port is port@4 with an external 4-port mux or
 631                  * port@2 with the internal 2-port mux.
 632                  */
 633                 ep = of_graph_get_endpoint_by_regs(child,
 634                                                    imx_ldb->lvds_mux ? 4 : 2,
 635                                                    -1);
 636                 if (ep) {
 637                         struct device_node *remote;
 638
 639                         remote = of_graph_get_remote_port_parent(ep);
 640                         of_node_put(ep);
 641                         if (remote)
 642                                 channel->panel = of_drm_find_panel(remote);
 643                         else
 644                                 return -EPROBE_DEFER;
 645                         of_node_put(remote);
 646                         if (!channel->panel) {
 647                                 dev_err(dev, "panel not found: %s\n",
 648                                         remote->full_name);
 649                                 return -EPROBE_DEFER;
 650                         }
 651                 }
 652
 653                 ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0);
 654                 if (ddc_node) {
 655                         channel->ddc = of_find_i2c_adapter_by_node(ddc_node);
 656                         of_node_put(ddc_node);
 657                         if (!channel->ddc) {
 658                                 dev_warn(dev, "failed to get ddc i2c adapter\n");
 659                                 return -EPROBE_DEFER;
 660                         }
 661                 }
 662
 663                 if (!channel->ddc) {
 664                         /* if no DDC available, fallback to hardcoded EDID */
 665                         dev_dbg(dev, "no ddc available\n");
 666
 667                         edidp = of_get_property(child, "edid",
 668                                                 &channel->edid_len);
 669                         if (edidp) {
 670                                 channel->edid = kmemdup(edidp,
 671                                                         channel->edid_len,
 672                                                         GFP_KERNEL);
 673                         } else if (!channel->panel) {
 674                                 /* fallback to display-timings node */
 675                                 ret = of_get_drm_display_mode(child,
 676                                                               &channel->mode,
 677                                                               OF_USE_NATIVE_MODE);
 678                                 if (!ret)
 679                                         channel->mode_valid = 1;
 680                         }
 681                 }
 682
 683                 bus_format = of_get_bus_format(dev, child);
 684                 if (bus_format == -EINVAL) {
 685                         /*
 686                          * If no bus format was specified in the device tree,
 687                          * we can still get it from the connected panel later.
 688                          */
 689                         if (channel->panel && channel->panel->funcs &&
 690                             channel->panel->funcs->get_modes)
 691                                 bus_format = 0;
 692                 }
 693                 if (bus_format < 0) {
 694                         dev_err(dev, "could not determine data mapping: %d\n",
 695                                 bus_format);
 696                         return bus_format;
 697                 }
 698                 channel->bus_format = bus_format;
 699
 700                 ret = imx_ldb_register(drm, channel);
 701                 if (ret)
 702                         return ret;
 703         }
 704
 705         dev_set_drvdata(dev, imx_ldb);
 706
 707         return 0;
 708 }
 709
 710 static void imx_ldb_unbind(struct device *dev, struct device *master,
 711         void *data)
 712 {
 713         struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
 714         int i;
 715
 716         for (i = 0; i < 2; i++) {
 717                 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
 718
 719                 if (!channel->connector.funcs)
 720                         continue;
 721
 722                 channel->connector.funcs->destroy(&channel->connector);
 723                 channel->encoder.funcs->destroy(&channel->encoder);
 724
 725                 kfree(channel->edid);
 726                 i2c_put_adapter(channel->ddc);
 727         }
 728 }
 729
 730 static const struct component_ops imx_ldb_ops = {
 731         .bind   = imx_ldb_bind,
 732         .unbind = imx_ldb_unbind,
 733 };
 734
 735 static int imx_ldb_probe(struct platform_device *pdev)
 736 {
 737         return component_add(&pdev->dev, &imx_ldb_ops);
 738 }
 739
 740 static int imx_ldb_remove(struct platform_device *pdev)
 741 {
 742         component_del(&pdev->dev, &imx_ldb_ops);
 743         return 0;
 744 }
 745
 746 static struct platform_driver imx_ldb_driver = {
 747         .probe          = imx_ldb_probe,
 748         .remove         = imx_ldb_remove,
 749         .driver         = {
 750                 .of_match_table = imx_ldb_dt_ids,
 751                 .name   = DRIVER_NAME,
 752         },
 753 };
 754
 755 module_platform_driver(imx_ldb_driver);
 756
 757 MODULE_DESCRIPTION("i.MX LVDS driver");
 758 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 759 MODULE_LICENSE("GPL");
 760 MODULE_ALIAS("platform:" DRIVER_NAME);