drivers/gpu/drm/bridge/sii902x.c

   1 /*
   2  * Copyright (C) 2016 Atmel
   3  *                    Bo Shen <voice.shen@atmel.com>
   4  *
   5  * Authors:           Bo Shen <voice.shen@atmel.com>
   6  *                    Boris Brezillon <boris.brezillon@free-electrons.com>
   7  *                    Wu, Songjun <Songjun.Wu@atmel.com>
   8  *
   9  *
  10  * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  */
  22
  23 #include <linux/gpio/consumer.h>
  24 #include <linux/i2c.h>
  25 #include <linux/module.h>
  26 #include <linux/regmap.h>
  27
  28 #include <drm/drmP.h>
  29 #include <drm/drm_atomic_helper.h>
  30 #include <drm/drm_crtc_helper.h>
  31 #include <drm/drm_edid.h>
  32
  33 #define SII902X_TPI_VIDEO_DATA                  0x0
  34
  35 #define SII902X_TPI_PIXEL_REPETITION            0x8
  36 #define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT     BIT(5)
  37 #define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE   BIT(4)
  38 #define SII902X_TPI_AVI_PIXEL_REP_4X            3
  39 #define SII902X_TPI_AVI_PIXEL_REP_2X            1
  40 #define SII902X_TPI_AVI_PIXEL_REP_NONE          0
  41 #define SII902X_TPI_CLK_RATIO_HALF              (0 << 6)
  42 #define SII902X_TPI_CLK_RATIO_1X                (1 << 6)
  43 #define SII902X_TPI_CLK_RATIO_2X                (2 << 6)
  44 #define SII902X_TPI_CLK_RATIO_4X                (3 << 6)
  45
  46 #define SII902X_TPI_AVI_IN_FORMAT               0x9
  47 #define SII902X_TPI_AVI_INPUT_BITMODE_12BIT     BIT(7)
  48 #define SII902X_TPI_AVI_INPUT_DITHER            BIT(6)
  49 #define SII902X_TPI_AVI_INPUT_RANGE_LIMITED     (2 << 2)
  50 #define SII902X_TPI_AVI_INPUT_RANGE_FULL        (1 << 2)
  51 #define SII902X_TPI_AVI_INPUT_RANGE_AUTO        (0 << 2)
  52 #define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK  (3 << 0)
  53 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
  54 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
  55 #define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB    (0 << 0)
  56
  57 #define SII902X_TPI_AVI_INFOFRAME               0x0c
  58
  59 #define SII902X_SYS_CTRL_DATA                   0x1a
  60 #define SII902X_SYS_CTRL_PWR_DWN                BIT(4)
  61 #define SII902X_SYS_CTRL_AV_MUTE                BIT(3)
  62 #define SII902X_SYS_CTRL_DDC_BUS_REQ            BIT(2)
  63 #define SII902X_SYS_CTRL_DDC_BUS_GRTD           BIT(1)
  64 #define SII902X_SYS_CTRL_OUTPUT_MODE            BIT(0)
  65 #define SII902X_SYS_CTRL_OUTPUT_HDMI            1
  66 #define SII902X_SYS_CTRL_OUTPUT_DVI             0
  67
  68 #define SII902X_REG_CHIPID(n)                   (0x1b + (n))
  69
  70 #define SII902X_PWR_STATE_CTRL                  0x1e
  71 #define SII902X_AVI_POWER_STATE_MSK             GENMASK(1, 0)
  72 #define SII902X_AVI_POWER_STATE_D(l)            ((l) & SII902X_AVI_POWER_STATE_MSK)
  73
  74 #define SII902X_INT_ENABLE                      0x3c
  75 #define SII902X_INT_STATUS                      0x3d
  76 #define SII902X_HOTPLUG_EVENT                   BIT(0)
  77 #define SII902X_PLUGGED_STATUS                  BIT(2)
  78
  79 #define SII902X_REG_TPI_RQB                     0xc7
  80
  81 #define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS  500
  82
  83 struct sii902x {
  84         struct i2c_client *i2c;
  85         struct regmap *regmap;
  86         struct drm_bridge bridge;
  87         struct drm_connector connector;
  88         struct gpio_desc *reset_gpio;
  89 };
  90
  91 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
  92 {
  93         return container_of(bridge, struct sii902x, bridge);
  94 }
  95
  96 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
  97 {
  98         return container_of(con, struct sii902x, connector);
  99 }
 100
 101 static void sii902x_reset(struct sii902x *sii902x)
 102 {
 103         if (!sii902x->reset_gpio)
 104                 return;
 105
 106         gpiod_set_value(sii902x->reset_gpio, 1);
 107
 108         /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
 109         usleep_range(150, 200);
 110
 111         gpiod_set_value(sii902x->reset_gpio, 0);
 112 }
 113
 114 static enum drm_connector_status
 115 sii902x_connector_detect(struct drm_connector *connector, bool force)
 116 {
 117         struct sii902x *sii902x = connector_to_sii902x(connector);
 118         unsigned int status;
 119
 120         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 121
 122         return (status & SII902X_PLUGGED_STATUS) ?
 123                connector_status_connected : connector_status_disconnected;
 124 }
 125
 126 static const struct drm_connector_funcs sii902x_connector_funcs = {
 127         .detect = sii902x_connector_detect,
 128         .fill_modes = drm_helper_probe_single_connector_modes,
 129         .destroy = drm_connector_cleanup,
 130         .reset = drm_atomic_helper_connector_reset,
 131         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 132         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 133 };
 134
 135 static int sii902x_get_modes(struct drm_connector *connector)
 136 {
 137         struct sii902x *sii902x = connector_to_sii902x(connector);
 138         struct regmap *regmap = sii902x->regmap;
 139         u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 140         struct device *dev = &sii902x->i2c->dev;
 141         unsigned long timeout;
 142         unsigned int retries;
 143         unsigned int status;
 144         struct edid *edid;
 145         int num = 0;
 146         int ret;
 147
 148         ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
 149                                  SII902X_SYS_CTRL_DDC_BUS_REQ,
 150                                  SII902X_SYS_CTRL_DDC_BUS_REQ);
 151         if (ret)
 152                 return ret;
 153
 154         timeout = jiffies +
 155                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 156         do {
 157                 ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
 158                 if (ret)
 159                         return ret;
 160         } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 161                  time_before(jiffies, timeout));
 162
 163         if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 164                 dev_err(dev, "failed to acquire the i2c bus\n");
 165                 return -ETIMEDOUT;
 166         }
 167
 168         ret = regmap_write(regmap, SII902X_SYS_CTRL_DATA, status);
 169         if (ret)
 170                 return ret;
 171
 172         edid = drm_get_edid(connector, sii902x->i2c->adapter);
 173         drm_connector_update_edid_property(connector, edid);
 174         if (edid) {
 175                 num = drm_add_edid_modes(connector, edid);
 176                 kfree(edid);
 177         }
 178
 179         ret = drm_display_info_set_bus_formats(&connector->display_info,
 180                                                &bus_format, 1);
 181         if (ret)
 182                 return ret;
 183
 184         /*
 185          * Sometimes the I2C bus can stall after failure to use the
 186          * EDID channel. Retry a few times to see if things clear
 187          * up, else continue anyway.
 188          */
 189         retries = 5;
 190         do {
 191                 ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA,
 192                                   &status);
 193                 retries--;
 194         } while (ret && retries);
 195         if (ret)
 196                 dev_err(dev, "failed to read status (%d)\n", ret);
 197
 198         ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
 199                                  SII902X_SYS_CTRL_DDC_BUS_REQ |
 200                                  SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
 201         if (ret)
 202                 return ret;
 203
 204         timeout = jiffies +
 205                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 206         do {
 207                 ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
 208                 if (ret)
 209                         return ret;
 210         } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 211                            SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 212                  time_before(jiffies, timeout));
 213
 214         if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 215                       SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 216                 dev_err(dev, "failed to release the i2c bus\n");
 217                 return -ETIMEDOUT;
 218         }
 219
 220         return num;
 221 }
 222
 223 static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
 224                                                struct drm_display_mode *mode)
 225 {
 226         /* TODO: check mode */
 227
 228         return MODE_OK;
 229 }
 230
 231 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
 232         .get_modes = sii902x_get_modes,
 233         .mode_valid = sii902x_mode_valid,
 234 };
 235
 236 static void sii902x_bridge_disable(struct drm_bridge *bridge)
 237 {
 238         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 239
 240         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 241                            SII902X_SYS_CTRL_PWR_DWN,
 242                            SII902X_SYS_CTRL_PWR_DWN);
 243 }
 244
 245 static void sii902x_bridge_enable(struct drm_bridge *bridge)
 246 {
 247         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 248
 249         regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
 250                            SII902X_AVI_POWER_STATE_MSK,
 251                            SII902X_AVI_POWER_STATE_D(0));
 252         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 253                            SII902X_SYS_CTRL_PWR_DWN, 0);
 254 }
 255
 256 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
 257                                     struct drm_display_mode *mode,
 258                                     struct drm_display_mode *adj)
 259 {
 260         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 261         struct regmap *regmap = sii902x->regmap;
 262         u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
 263         struct hdmi_avi_infoframe frame;
 264         u16 pixel_clock_10kHz = adj->clock / 10;
 265         int ret;
 266
 267         buf[0] = pixel_clock_10kHz & 0xff;
 268         buf[1] = pixel_clock_10kHz >> 8;
 269         buf[2] = adj->vrefresh;
 270         buf[3] = 0x00;
 271         buf[4] = adj->hdisplay;
 272         buf[5] = adj->hdisplay >> 8;
 273         buf[6] = adj->vdisplay;
 274         buf[7] = adj->vdisplay >> 8;
 275         buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
 276                  SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
 277         buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
 278                  SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
 279
 280         ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
 281         if (ret)
 282                 return;
 283
 284         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, adj, false);
 285         if (ret < 0) {
 286                 DRM_ERROR("couldn't fill AVI infoframe\n");
 287                 return;
 288         }
 289
 290         ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
 291         if (ret < 0) {
 292                 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
 293                 return;
 294         }
 295
 296         /* Do not send the infoframe header, but keep the CRC field. */
 297         regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
 298                           buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
 299                           HDMI_AVI_INFOFRAME_SIZE + 1);
 300 }
 301
 302 static int sii902x_bridge_attach(struct drm_bridge *bridge)
 303 {
 304         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 305         struct drm_device *drm = bridge->dev;
 306         int ret;
 307
 308         drm_connector_helper_add(&sii902x->connector,
 309                                  &sii902x_connector_helper_funcs);
 310
 311         if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
 312                 dev_err(&sii902x->i2c->dev,
 313                         "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
 314                 return -ENOTSUPP;
 315         }
 316
 317         ret = drm_connector_init(drm, &sii902x->connector,
 318                                  &sii902x_connector_funcs,
 319                                  DRM_MODE_CONNECTOR_HDMIA);
 320         if (ret)
 321                 return ret;
 322
 323         if (sii902x->i2c->irq > 0)
 324                 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
 325         else
 326                 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 327
 328         drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
 329
 330         return 0;
 331 }
 332
 333 static const struct drm_bridge_funcs sii902x_bridge_funcs = {
 334         .attach = sii902x_bridge_attach,
 335         .mode_set = sii902x_bridge_mode_set,
 336         .disable = sii902x_bridge_disable,
 337         .enable = sii902x_bridge_enable,
 338 };
 339
 340 static const struct regmap_range sii902x_volatile_ranges[] = {
 341         { .range_min = 0, .range_max = 0xff },
 342 };
 343
 344 static const struct regmap_access_table sii902x_volatile_table = {
 345         .yes_ranges = sii902x_volatile_ranges,
 346         .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
 347 };
 348
 349 static const struct regmap_config sii902x_regmap_config = {
 350         .reg_bits = 8,
 351         .val_bits = 8,
 352         .volatile_table = &sii902x_volatile_table,
 353         .cache_type = REGCACHE_NONE,
 354 };
 355
 356 static irqreturn_t sii902x_interrupt(int irq, void *data)
 357 {
 358         struct sii902x *sii902x = data;
 359         unsigned int status = 0;
 360
 361         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 362         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
 363
 364         if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
 365                 drm_helper_hpd_irq_event(sii902x->bridge.dev);
 366
 367         return IRQ_HANDLED;
 368 }
 369
 370 static int sii902x_probe(struct i2c_client *client,
 371                          const struct i2c_device_id *id)
 372 {
 373         struct device *dev = &client->dev;
 374         unsigned int status = 0;
 375         struct sii902x *sii902x;
 376         u8 chipid[4];
 377         int ret;
 378
 379         sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
 380         if (!sii902x)
 381                 return -ENOMEM;
 382
 383         sii902x->i2c = client;
 384         sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
 385         if (IS_ERR(sii902x->regmap))
 386                 return PTR_ERR(sii902x->regmap);
 387
 388         sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
 389                                                       GPIOD_OUT_LOW);
 390         if (IS_ERR(sii902x->reset_gpio)) {
 391                 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
 392                         PTR_ERR(sii902x->reset_gpio));
 393                 return PTR_ERR(sii902x->reset_gpio);
 394         }
 395
 396         sii902x_reset(sii902x);
 397
 398         ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
 399         if (ret)
 400                 return ret;
 401
 402         ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
 403                                &chipid, 4);
 404         if (ret) {
 405                 dev_err(dev, "regmap_read failed %d\n", ret);
 406                 return ret;
 407         }
 408
 409         if (chipid[0] != 0xb0) {
 410                 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
 411                         chipid[0]);
 412                 return -EINVAL;
 413         }
 414
 415         /* Clear all pending interrupts */
 416         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 417         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
 418
 419         if (client->irq > 0) {
 420                 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
 421                              SII902X_HOTPLUG_EVENT);
 422
 423                 ret = devm_request_threaded_irq(dev, client->irq, NULL,
 424                                                 sii902x_interrupt,
 425                                                 IRQF_ONESHOT, dev_name(dev),
 426                                                 sii902x);
 427                 if (ret)
 428                         return ret;
 429         }
 430
 431         sii902x->bridge.funcs = &sii902x_bridge_funcs;
 432         sii902x->bridge.of_node = dev->of_node;
 433         drm_bridge_add(&sii902x->bridge);
 434
 435         i2c_set_clientdata(client, sii902x);
 436
 437         return 0;
 438 }
 439
 440 static int sii902x_remove(struct i2c_client *client)
 441
 442 {
 443         struct sii902x *sii902x = i2c_get_clientdata(client);
 444
 445         drm_bridge_remove(&sii902x->bridge);
 446
 447         return 0;
 448 }
 449
 450 static const struct of_device_id sii902x_dt_ids[] = {
 451         { .compatible = "sil,sii9022", },
 452         { }
 453 };
 454 MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
 455
 456 static const struct i2c_device_id sii902x_i2c_ids[] = {
 457         { "sii9022", 0 },
 458         { },
 459 };
 460 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
 461
 462 static struct i2c_driver sii902x_driver = {
 463         .probe = sii902x_probe,
 464         .remove = sii902x_remove,
 465         .driver = {
 466                 .name = "sii902x",
 467                 .of_match_table = sii902x_dt_ids,
 468         },
 469         .id_table = sii902x_i2c_ids,
 470 };
 471 module_i2c_driver(sii902x_driver);
 472
 473 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 474 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
 475 MODULE_LICENSE("GPL");