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