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"); 468