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         .dpms = drm_atomic_helper_connector_dpms,
 128         .detect = sii902x_connector_detect,
 129         .fill_modes = drm_helper_probe_single_connector_modes,
 130         .destroy = drm_connector_cleanup,
 131         .reset = drm_atomic_helper_connector_reset,
 132         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 133         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 134 };
 135
 136 static int sii902x_get_modes(struct drm_connector *connector)
 137 {
 138         struct sii902x *sii902x = connector_to_sii902x(connector);
 139         struct regmap *regmap = sii902x->regmap;
 140         u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 141         unsigned long timeout;
 142         unsigned int status;
 143         struct edid *edid;
 144         int num = 0;
 145         int ret;
 146
 147         ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
 148                                  SII902X_SYS_CTRL_DDC_BUS_REQ,
 149                                  SII902X_SYS_CTRL_DDC_BUS_REQ);
 150         if (ret)
 151                 return ret;
 152
 153         timeout = jiffies +
 154                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 155         do {
 156                 ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
 157                 if (ret)
 158                         return ret;
 159         } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 160                  time_before(jiffies, timeout));
 161
 162         if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 163                 dev_err(&sii902x->i2c->dev, "failed to acquire the i2c bus");
 164                 return -ETIMEDOUT;
 165         }
 166
 167         ret = regmap_write(regmap, SII902X_SYS_CTRL_DATA, status);
 168         if (ret)
 169                 return ret;
 170
 171         edid = drm_get_edid(connector, sii902x->i2c->adapter);
 172         drm_mode_connector_update_edid_property(connector, edid);
 173         if (edid) {
 174                 num = drm_add_edid_modes(connector, edid);
 175                 kfree(edid);
 176         }
 177
 178         ret = drm_display_info_set_bus_formats(&connector->display_info,
 179                                                &bus_format, 1);
 180         if (ret)
 181                 return ret;
 182
 183         ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
 184         if (ret)
 185                 return ret;
 186
 187         ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
 188                                  SII902X_SYS_CTRL_DDC_BUS_REQ |
 189                                  SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
 190         if (ret)
 191                 return ret;
 192
 193         timeout = jiffies +
 194                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 195         do {
 196                 ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
 197                 if (ret)
 198                         return ret;
 199         } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 200                            SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 201                  time_before(jiffies, timeout));
 202
 203         if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 204                       SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 205                 dev_err(&sii902x->i2c->dev, "failed to release the i2c bus");
 206                 return -ETIMEDOUT;
 207         }
 208
 209         return num;
 210 }
 211
 212 static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
 213                                                struct drm_display_mode *mode)
 214 {
 215         /* TODO: check mode */
 216
 217         return MODE_OK;
 218 }
 219
 220 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
 221         .get_modes = sii902x_get_modes,
 222         .mode_valid = sii902x_mode_valid,
 223 };
 224
 225 static void sii902x_bridge_disable(struct drm_bridge *bridge)
 226 {
 227         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 228
 229         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 230                            SII902X_SYS_CTRL_PWR_DWN,
 231                            SII902X_SYS_CTRL_PWR_DWN);
 232 }
 233
 234 static void sii902x_bridge_enable(struct drm_bridge *bridge)
 235 {
 236         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 237
 238         regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
 239                            SII902X_AVI_POWER_STATE_MSK,
 240                            SII902X_AVI_POWER_STATE_D(0));
 241         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 242                            SII902X_SYS_CTRL_PWR_DWN, 0);
 243 }
 244
 245 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
 246                                     struct drm_display_mode *mode,
 247                                     struct drm_display_mode *adj)
 248 {
 249         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 250         struct regmap *regmap = sii902x->regmap;
 251         u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
 252         struct hdmi_avi_infoframe frame;
 253         int ret;
 254
 255         buf[0] = adj->clock;
 256         buf[1] = adj->clock >> 8;
 257         buf[2] = adj->vrefresh;
 258         buf[3] = 0x00;
 259         buf[4] = adj->hdisplay;
 260         buf[5] = adj->hdisplay >> 8;
 261         buf[6] = adj->vdisplay;
 262         buf[7] = adj->vdisplay >> 8;
 263         buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
 264                  SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
 265         buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
 266                  SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
 267
 268         ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
 269         if (ret)
 270                 return;
 271
 272         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, adj);
 273         if (ret < 0) {
 274                 DRM_ERROR("couldn't fill AVI infoframe\n");
 275                 return;
 276         }
 277
 278         ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
 279         if (ret < 0) {
 280                 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
 281                 return;
 282         }
 283
 284         /* Do not send the infoframe header, but keep the CRC field. */
 285         regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
 286                           buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
 287                           HDMI_AVI_INFOFRAME_SIZE + 1);
 288 }
 289
 290 static int sii902x_bridge_attach(struct drm_bridge *bridge)
 291 {
 292         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 293         struct drm_device *drm = bridge->dev;
 294         int ret;
 295
 296         drm_connector_helper_add(&sii902x->connector,
 297                                  &sii902x_connector_helper_funcs);
 298
 299         if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
 300                 dev_err(&sii902x->i2c->dev,
 301                         "sii902x driver is only compatible with DRM devices supporting atomic updates");
 302                 return -ENOTSUPP;
 303         }
 304
 305         ret = drm_connector_init(drm, &sii902x->connector,
 306                                  &sii902x_connector_funcs,
 307                                  DRM_MODE_CONNECTOR_HDMIA);
 308         if (ret)
 309                 return ret;
 310
 311         if (sii902x->i2c->irq > 0)
 312                 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
 313         else
 314                 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 315
 316         drm_mode_connector_attach_encoder(&sii902x->connector, bridge->encoder);
 317
 318         return 0;
 319 }
 320
 321 static const struct drm_bridge_funcs sii902x_bridge_funcs = {
 322         .attach = sii902x_bridge_attach,
 323         .mode_set = sii902x_bridge_mode_set,
 324         .disable = sii902x_bridge_disable,
 325         .enable = sii902x_bridge_enable,
 326 };
 327
 328 static const struct regmap_range sii902x_volatile_ranges[] = {
 329         { .range_min = 0, .range_max = 0xff },
 330 };
 331
 332 static const struct regmap_access_table sii902x_volatile_table = {
 333         .yes_ranges = sii902x_volatile_ranges,
 334         .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
 335 };
 336
 337 static const struct regmap_config sii902x_regmap_config = {
 338         .reg_bits = 8,
 339         .val_bits = 8,
 340         .volatile_table = &sii902x_volatile_table,
 341         .cache_type = REGCACHE_NONE,
 342 };
 343
 344 static irqreturn_t sii902x_interrupt(int irq, void *data)
 345 {
 346         struct sii902x *sii902x = data;
 347         unsigned int status = 0;
 348
 349         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 350         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
 351
 352         if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
 353                 drm_helper_hpd_irq_event(sii902x->bridge.dev);
 354
 355         return IRQ_HANDLED;
 356 }
 357
 358 static int sii902x_probe(struct i2c_client *client,
 359                          const struct i2c_device_id *id)
 360 {
 361         struct device *dev = &client->dev;
 362         unsigned int status = 0;
 363         struct sii902x *sii902x;
 364         u8 chipid[4];
 365         int ret;
 366
 367         sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
 368         if (!sii902x)
 369                 return -ENOMEM;
 370
 371         sii902x->i2c = client;
 372         sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
 373         if (IS_ERR(sii902x->regmap))
 374                 return PTR_ERR(sii902x->regmap);
 375
 376         sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
 377                                                       GPIOD_OUT_LOW);
 378         if (IS_ERR(sii902x->reset_gpio)) {
 379                 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
 380                         PTR_ERR(sii902x->reset_gpio));
 381                 return PTR_ERR(sii902x->reset_gpio);
 382         }
 383
 384         sii902x_reset(sii902x);
 385
 386         ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
 387         if (ret)
 388                 return ret;
 389
 390         ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
 391                                &chipid, 4);
 392         if (ret) {
 393                 dev_err(dev, "regmap_read failed %d\n", ret);
 394                 return ret;
 395         }
 396
 397         if (chipid[0] != 0xb0) {
 398                 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
 399                         chipid[0]);
 400                 return -EINVAL;
 401         }
 402
 403         /* Clear all pending interrupts */
 404         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 405         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
 406
 407         if (client->irq > 0) {
 408                 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
 409                              SII902X_HOTPLUG_EVENT);
 410
 411                 ret = devm_request_threaded_irq(dev, client->irq, NULL,
 412                                                 sii902x_interrupt,
 413                                                 IRQF_ONESHOT, dev_name(dev),
 414                                                 sii902x);
 415                 if (ret)
 416                         return ret;
 417         }
 418
 419         sii902x->bridge.funcs = &sii902x_bridge_funcs;
 420         sii902x->bridge.of_node = dev->of_node;
 421         ret = drm_bridge_add(&sii902x->bridge);
 422         if (ret) {
 423                 dev_err(dev, "Failed to add drm_bridge\n");
 424                 return ret;
 425         }
 426
 427         i2c_set_clientdata(client, sii902x);
 428
 429         return 0;
 430 }
 431
 432 static int sii902x_remove(struct i2c_client *client)
 433
 434 {
 435         struct sii902x *sii902x = i2c_get_clientdata(client);
 436
 437         drm_bridge_remove(&sii902x->bridge);
 438
 439         return 0;
 440 }
 441
 442 static const struct of_device_id sii902x_dt_ids[] = {
 443         { .compatible = "sil,sii9022", },
 444         { }
 445 };
 446 MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
 447
 448 static const struct i2c_device_id sii902x_i2c_ids[] = {
 449         { "sii9022", 0 },
 450         { },
 451 };
 452 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
 453
 454 static struct i2c_driver sii902x_driver = {
 455         .probe = sii902x_probe,
 456         .remove = sii902x_remove,
 457         .driver = {
 458                 .name = "sii902x",
 459                 .of_match_table = sii902x_dt_ids,
 460         },
 461         .id_table = sii902x_i2c_ids,
 462 };
 463 module_i2c_driver(sii902x_driver);
 464
 465 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 466 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
 467 MODULE_LICENSE("GPL");