Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Parade PS8622 eDP/LVDS bridge driver |
| 3 | * |
| 4 | * Copyright (C) 2014 Google, Inc. |
| 5 | * |
| 6 | * This software is licensed under the terms of the GNU General Public |
| 7 | * License version 2, as published by the Free Software Foundation, and |
| 8 | * may be copied, distributed, and modified under those terms. |
| 9 | * |
| 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/backlight.h> |
| 17 | #include <linux/delay.h> |
| 18 | #include <linux/err.h> |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 19 | #include <linux/gpio.h> |
Geert Uytterhoeven | dcd43d6 | 2015-05-05 18:32:18 +0200 | [diff] [blame] | 20 | #include <linux/gpio/consumer.h> |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 21 | #include <linux/i2c.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/of.h> |
| 24 | #include <linux/of_device.h> |
| 25 | #include <linux/of_graph.h> |
| 26 | #include <linux/pm.h> |
| 27 | #include <linux/regulator/consumer.h> |
| 28 | |
| 29 | #include <drm/drm_panel.h> |
| 30 | |
| 31 | #include "drmP.h" |
| 32 | #include "drm_crtc.h" |
| 33 | #include "drm_crtc_helper.h" |
Gustavo Padovan | 4ea9526 | 2015-06-01 12:04:44 -0300 | [diff] [blame] | 34 | #include "drm_atomic_helper.h" |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 35 | |
| 36 | /* Brightness scale on the Parade chip */ |
| 37 | #define PS8622_MAX_BRIGHTNESS 0xff |
| 38 | |
| 39 | /* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */ |
| 40 | #define PS8622_POWER_RISE_T1_MIN_US 10 |
| 41 | #define PS8622_POWER_RISE_T1_MAX_US 10000 |
| 42 | #define PS8622_RST_HIGH_T2_MIN_US 3000 |
| 43 | #define PS8622_RST_HIGH_T2_MAX_US 30000 |
| 44 | #define PS8622_PWMO_END_T12_MS 200 |
| 45 | #define PS8622_POWER_FALL_T16_MAX_US 10000 |
| 46 | #define PS8622_POWER_OFF_T17_MS 500 |
| 47 | |
| 48 | #if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \ |
| 49 | (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US)) |
| 50 | #error "T2.min + T1.max must be less than T2.max + T1.min" |
| 51 | #endif |
| 52 | |
| 53 | struct ps8622_bridge { |
| 54 | struct drm_connector connector; |
| 55 | struct i2c_client *client; |
| 56 | struct drm_bridge bridge; |
| 57 | struct drm_panel *panel; |
| 58 | struct regulator *v12; |
| 59 | struct backlight_device *bl; |
| 60 | |
| 61 | struct gpio_desc *gpio_slp; |
| 62 | struct gpio_desc *gpio_rst; |
| 63 | |
| 64 | u32 max_lane_count; |
| 65 | u32 lane_count; |
| 66 | |
| 67 | bool enabled; |
| 68 | }; |
| 69 | |
| 70 | static inline struct ps8622_bridge * |
| 71 | bridge_to_ps8622(struct drm_bridge *bridge) |
| 72 | { |
| 73 | return container_of(bridge, struct ps8622_bridge, bridge); |
| 74 | } |
| 75 | |
| 76 | static inline struct ps8622_bridge * |
| 77 | connector_to_ps8622(struct drm_connector *connector) |
| 78 | { |
| 79 | return container_of(connector, struct ps8622_bridge, connector); |
| 80 | } |
| 81 | |
| 82 | static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val) |
| 83 | { |
| 84 | int ret; |
| 85 | struct i2c_adapter *adap = client->adapter; |
| 86 | struct i2c_msg msg; |
| 87 | u8 data[] = {reg, val}; |
| 88 | |
| 89 | msg.addr = client->addr + page; |
| 90 | msg.flags = 0; |
| 91 | msg.len = sizeof(data); |
| 92 | msg.buf = data; |
| 93 | |
| 94 | ret = i2c_transfer(adap, &msg, 1); |
| 95 | if (ret != 1) |
| 96 | pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n", |
| 97 | client->addr + page, reg, val, ret); |
| 98 | return !(ret == 1); |
| 99 | } |
| 100 | |
| 101 | static int ps8622_send_config(struct ps8622_bridge *ps8622) |
| 102 | { |
| 103 | struct i2c_client *cl = ps8622->client; |
| 104 | int err = 0; |
| 105 | |
| 106 | /* HPD low */ |
| 107 | err = ps8622_set(cl, 0x02, 0xa1, 0x01); |
| 108 | if (err) |
| 109 | goto error; |
| 110 | |
| 111 | /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */ |
| 112 | err = ps8622_set(cl, 0x04, 0x14, 0x01); |
| 113 | if (err) |
| 114 | goto error; |
| 115 | |
| 116 | /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */ |
| 117 | err = ps8622_set(cl, 0x04, 0xe3, 0x20); |
| 118 | if (err) |
| 119 | goto error; |
| 120 | |
| 121 | /* [7] RCO SS enable */ |
| 122 | err = ps8622_set(cl, 0x04, 0xe2, 0x80); |
| 123 | if (err) |
| 124 | goto error; |
| 125 | |
| 126 | /* RPHY Setting |
| 127 | * [3:2] CDR tune wait cycle before measure for fine tune |
| 128 | * b00: 1us b01: 0.5us b10:2us, b11: 4us |
| 129 | */ |
| 130 | err = ps8622_set(cl, 0x04, 0x8a, 0x0c); |
| 131 | if (err) |
| 132 | goto error; |
| 133 | |
| 134 | /* [3] RFD always on */ |
| 135 | err = ps8622_set(cl, 0x04, 0x89, 0x08); |
| 136 | if (err) |
| 137 | goto error; |
| 138 | |
| 139 | /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */ |
| 140 | err = ps8622_set(cl, 0x04, 0x71, 0x2d); |
| 141 | if (err) |
| 142 | goto error; |
| 143 | |
| 144 | /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */ |
| 145 | err = ps8622_set(cl, 0x04, 0x7d, 0x07); |
| 146 | if (err) |
| 147 | goto error; |
| 148 | |
| 149 | /* [1:0] Fmin=+4bands */ |
| 150 | err = ps8622_set(cl, 0x04, 0x7b, 0x00); |
| 151 | if (err) |
| 152 | goto error; |
| 153 | |
| 154 | /* [7:5] DCO_FTRNG=+-40% */ |
| 155 | err = ps8622_set(cl, 0x04, 0x7a, 0xfd); |
| 156 | if (err) |
| 157 | goto error; |
| 158 | |
| 159 | /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */ |
| 160 | err = ps8622_set(cl, 0x04, 0xc0, 0x12); |
| 161 | if (err) |
| 162 | goto error; |
| 163 | |
| 164 | /* Gitune=-37% */ |
| 165 | err = ps8622_set(cl, 0x04, 0xc1, 0x92); |
| 166 | if (err) |
| 167 | goto error; |
| 168 | |
| 169 | /* Fbstep=100% */ |
| 170 | err = ps8622_set(cl, 0x04, 0xc2, 0x1c); |
| 171 | if (err) |
| 172 | goto error; |
| 173 | |
| 174 | /* [7] LOS signal disable */ |
| 175 | err = ps8622_set(cl, 0x04, 0x32, 0x80); |
| 176 | if (err) |
| 177 | goto error; |
| 178 | |
| 179 | /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */ |
| 180 | err = ps8622_set(cl, 0x04, 0x00, 0xb0); |
| 181 | if (err) |
| 182 | goto error; |
| 183 | |
| 184 | /* [7:6] Right-bar GPIO output strength is 8mA */ |
| 185 | err = ps8622_set(cl, 0x04, 0x15, 0x40); |
| 186 | if (err) |
| 187 | goto error; |
| 188 | |
| 189 | /* EQ Training State Machine Setting, RCO calibration start */ |
| 190 | err = ps8622_set(cl, 0x04, 0x54, 0x10); |
| 191 | if (err) |
| 192 | goto error; |
| 193 | |
| 194 | /* Logic, needs more than 10 I2C command */ |
| 195 | /* [4:0] MAX_LANE_COUNT set to max supported lanes */ |
| 196 | err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count); |
| 197 | if (err) |
| 198 | goto error; |
| 199 | |
| 200 | /* [4:0] LANE_COUNT_SET set to chosen lane count */ |
| 201 | err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count); |
| 202 | if (err) |
| 203 | goto error; |
| 204 | |
| 205 | err = ps8622_set(cl, 0x00, 0x52, 0x20); |
| 206 | if (err) |
| 207 | goto error; |
| 208 | |
| 209 | /* HPD CP toggle enable */ |
| 210 | err = ps8622_set(cl, 0x00, 0xf1, 0x03); |
| 211 | if (err) |
| 212 | goto error; |
| 213 | |
| 214 | err = ps8622_set(cl, 0x00, 0x62, 0x41); |
| 215 | if (err) |
| 216 | goto error; |
| 217 | |
| 218 | /* Counter number, add 1ms counter delay */ |
| 219 | err = ps8622_set(cl, 0x00, 0xf6, 0x01); |
| 220 | if (err) |
| 221 | goto error; |
| 222 | |
| 223 | /* [6]PWM function control by DPCD0040f[7], default is PWM block */ |
| 224 | err = ps8622_set(cl, 0x00, 0x77, 0x06); |
| 225 | if (err) |
| 226 | goto error; |
| 227 | |
| 228 | /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */ |
| 229 | err = ps8622_set(cl, 0x00, 0x4c, 0x04); |
| 230 | if (err) |
| 231 | goto error; |
| 232 | |
| 233 | /* DPCD00400='h00, Parade OUI ='h001cf8 */ |
| 234 | err = ps8622_set(cl, 0x01, 0xc0, 0x00); |
| 235 | if (err) |
| 236 | goto error; |
| 237 | |
| 238 | /* DPCD00401='h1c */ |
| 239 | err = ps8622_set(cl, 0x01, 0xc1, 0x1c); |
| 240 | if (err) |
| 241 | goto error; |
| 242 | |
| 243 | /* DPCD00402='hf8 */ |
| 244 | err = ps8622_set(cl, 0x01, 0xc2, 0xf8); |
| 245 | if (err) |
| 246 | goto error; |
| 247 | |
| 248 | /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */ |
| 249 | err = ps8622_set(cl, 0x01, 0xc3, 0x44); |
| 250 | if (err) |
| 251 | goto error; |
| 252 | |
| 253 | /* DPCD404 */ |
| 254 | err = ps8622_set(cl, 0x01, 0xc4, 0x32); |
| 255 | if (err) |
| 256 | goto error; |
| 257 | |
| 258 | /* DPCD405 */ |
| 259 | err = ps8622_set(cl, 0x01, 0xc5, 0x53); |
| 260 | if (err) |
| 261 | goto error; |
| 262 | |
| 263 | /* DPCD406 */ |
| 264 | err = ps8622_set(cl, 0x01, 0xc6, 0x4c); |
| 265 | if (err) |
| 266 | goto error; |
| 267 | |
| 268 | /* DPCD407 */ |
| 269 | err = ps8622_set(cl, 0x01, 0xc7, 0x56); |
| 270 | if (err) |
| 271 | goto error; |
| 272 | |
| 273 | /* DPCD408 */ |
| 274 | err = ps8622_set(cl, 0x01, 0xc8, 0x35); |
| 275 | if (err) |
| 276 | goto error; |
| 277 | |
| 278 | /* DPCD40A, Initial Code major revision '01' */ |
| 279 | err = ps8622_set(cl, 0x01, 0xca, 0x01); |
| 280 | if (err) |
| 281 | goto error; |
| 282 | |
| 283 | /* DPCD40B, Initial Code minor revision '05' */ |
| 284 | err = ps8622_set(cl, 0x01, 0xcb, 0x05); |
| 285 | if (err) |
| 286 | goto error; |
| 287 | |
| 288 | |
| 289 | if (ps8622->bl) { |
| 290 | /* DPCD720, internal PWM */ |
| 291 | err = ps8622_set(cl, 0x01, 0xa5, 0xa0); |
| 292 | if (err) |
| 293 | goto error; |
| 294 | |
| 295 | /* FFh for 100% brightness, 0h for 0% brightness */ |
| 296 | err = ps8622_set(cl, 0x01, 0xa7, |
| 297 | ps8622->bl->props.brightness); |
| 298 | if (err) |
| 299 | goto error; |
| 300 | } else { |
| 301 | /* DPCD720, external PWM */ |
| 302 | err = ps8622_set(cl, 0x01, 0xa5, 0x80); |
| 303 | if (err) |
| 304 | goto error; |
| 305 | } |
| 306 | |
| 307 | /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */ |
| 308 | err = ps8622_set(cl, 0x01, 0xcc, 0x13); |
| 309 | if (err) |
| 310 | goto error; |
| 311 | |
| 312 | /* Enable SSC set by register */ |
| 313 | err = ps8622_set(cl, 0x02, 0xb1, 0x20); |
| 314 | if (err) |
| 315 | goto error; |
| 316 | |
| 317 | /* Set SSC enabled and +/-1% central spreading */ |
| 318 | err = ps8622_set(cl, 0x04, 0x10, 0x16); |
| 319 | if (err) |
| 320 | goto error; |
| 321 | |
| 322 | /* Logic end */ |
| 323 | /* MPU Clock source: LC => RCO */ |
| 324 | err = ps8622_set(cl, 0x04, 0x59, 0x60); |
| 325 | if (err) |
| 326 | goto error; |
| 327 | |
| 328 | /* LC -> RCO */ |
| 329 | err = ps8622_set(cl, 0x04, 0x54, 0x14); |
| 330 | if (err) |
| 331 | goto error; |
| 332 | |
| 333 | /* HPD high */ |
| 334 | err = ps8622_set(cl, 0x02, 0xa1, 0x91); |
| 335 | |
| 336 | error: |
| 337 | return err ? -EIO : 0; |
| 338 | } |
| 339 | |
| 340 | static int ps8622_backlight_update(struct backlight_device *bl) |
| 341 | { |
| 342 | struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev); |
| 343 | int ret, brightness = bl->props.brightness; |
| 344 | |
| 345 | if (bl->props.power != FB_BLANK_UNBLANK || |
| 346 | bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) |
| 347 | brightness = 0; |
| 348 | |
| 349 | if (!ps8622->enabled) |
| 350 | return -EINVAL; |
| 351 | |
| 352 | ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness); |
| 353 | |
| 354 | return ret; |
| 355 | } |
| 356 | |
| 357 | static const struct backlight_ops ps8622_backlight_ops = { |
| 358 | .update_status = ps8622_backlight_update, |
| 359 | }; |
| 360 | |
| 361 | static void ps8622_pre_enable(struct drm_bridge *bridge) |
| 362 | { |
| 363 | struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); |
| 364 | int ret; |
| 365 | |
| 366 | if (ps8622->enabled) |
| 367 | return; |
| 368 | |
| 369 | gpiod_set_value(ps8622->gpio_rst, 0); |
| 370 | |
| 371 | if (ps8622->v12) { |
| 372 | ret = regulator_enable(ps8622->v12); |
| 373 | if (ret) |
| 374 | DRM_ERROR("fails to enable ps8622->v12"); |
| 375 | } |
| 376 | |
| 377 | if (drm_panel_prepare(ps8622->panel)) { |
| 378 | DRM_ERROR("failed to prepare panel\n"); |
| 379 | return; |
| 380 | } |
| 381 | |
| 382 | gpiod_set_value(ps8622->gpio_slp, 1); |
| 383 | |
| 384 | /* |
| 385 | * T1 is the range of time that it takes for the power to rise after we |
| 386 | * enable the lcd/ps8622 fet. T2 is the range of time in which the |
| 387 | * data sheet specifies we should deassert the reset pin. |
| 388 | * |
| 389 | * If it takes T1.max for the power to rise, we need to wait atleast |
| 390 | * T2.min before deasserting the reset pin. If it takes T1.min for the |
| 391 | * power to rise, we need to wait at most T2.max before deasserting the |
| 392 | * reset pin. |
| 393 | */ |
| 394 | usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US, |
| 395 | PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US); |
| 396 | |
| 397 | gpiod_set_value(ps8622->gpio_rst, 1); |
| 398 | |
| 399 | /* wait 20ms after RST high */ |
| 400 | usleep_range(20000, 30000); |
| 401 | |
| 402 | ret = ps8622_send_config(ps8622); |
| 403 | if (ret) { |
| 404 | DRM_ERROR("Failed to send config to bridge (%d)\n", ret); |
| 405 | return; |
| 406 | } |
| 407 | |
| 408 | ps8622->enabled = true; |
| 409 | } |
| 410 | |
| 411 | static void ps8622_enable(struct drm_bridge *bridge) |
| 412 | { |
| 413 | struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); |
| 414 | |
| 415 | if (drm_panel_enable(ps8622->panel)) { |
| 416 | DRM_ERROR("failed to enable panel\n"); |
| 417 | return; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | static void ps8622_disable(struct drm_bridge *bridge) |
| 422 | { |
| 423 | struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); |
| 424 | |
| 425 | if (drm_panel_disable(ps8622->panel)) { |
| 426 | DRM_ERROR("failed to disable panel\n"); |
| 427 | return; |
| 428 | } |
| 429 | msleep(PS8622_PWMO_END_T12_MS); |
| 430 | } |
| 431 | |
| 432 | static void ps8622_post_disable(struct drm_bridge *bridge) |
| 433 | { |
| 434 | struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); |
| 435 | |
| 436 | if (!ps8622->enabled) |
| 437 | return; |
| 438 | |
| 439 | ps8622->enabled = false; |
| 440 | |
| 441 | /* |
| 442 | * This doesn't matter if the regulators are turned off, but something |
| 443 | * else might keep them on. In that case, we want to assert the slp gpio |
| 444 | * to lower power. |
| 445 | */ |
| 446 | gpiod_set_value(ps8622->gpio_slp, 0); |
| 447 | |
| 448 | if (drm_panel_unprepare(ps8622->panel)) { |
| 449 | DRM_ERROR("failed to unprepare panel\n"); |
| 450 | return; |
| 451 | } |
| 452 | |
| 453 | if (ps8622->v12) |
| 454 | regulator_disable(ps8622->v12); |
| 455 | |
| 456 | /* |
| 457 | * Sleep for at least the amount of time that it takes the power rail to |
| 458 | * fall to prevent asserting the rst gpio from doing anything. |
| 459 | */ |
| 460 | usleep_range(PS8622_POWER_FALL_T16_MAX_US, |
| 461 | 2 * PS8622_POWER_FALL_T16_MAX_US); |
| 462 | gpiod_set_value(ps8622->gpio_rst, 0); |
| 463 | |
| 464 | msleep(PS8622_POWER_OFF_T17_MS); |
| 465 | } |
| 466 | |
| 467 | static int ps8622_get_modes(struct drm_connector *connector) |
| 468 | { |
| 469 | struct ps8622_bridge *ps8622; |
| 470 | |
| 471 | ps8622 = connector_to_ps8622(connector); |
| 472 | |
| 473 | return drm_panel_get_modes(ps8622->panel); |
| 474 | } |
| 475 | |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 476 | static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = { |
| 477 | .get_modes = ps8622_get_modes, |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 478 | }; |
| 479 | |
| 480 | static enum drm_connector_status ps8622_detect(struct drm_connector *connector, |
| 481 | bool force) |
| 482 | { |
| 483 | return connector_status_connected; |
| 484 | } |
| 485 | |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 486 | static const struct drm_connector_funcs ps8622_connector_funcs = { |
Gustavo Padovan | 63498e3 | 2015-06-01 12:04:53 -0300 | [diff] [blame] | 487 | .dpms = drm_atomic_helper_connector_dpms, |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 488 | .fill_modes = drm_helper_probe_single_connector_modes, |
| 489 | .detect = ps8622_detect, |
Marek Vasut | bf3b123 | 2016-10-05 00:23:31 +0200 | [diff] [blame^] | 490 | .destroy = drm_connector_cleanup, |
Gustavo Padovan | 4ea9526 | 2015-06-01 12:04:44 -0300 | [diff] [blame] | 491 | .reset = drm_atomic_helper_connector_reset, |
| 492 | .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, |
| 493 | .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 494 | }; |
| 495 | |
Thierry Reding | 8a7d56b | 2015-01-30 12:29:09 +0100 | [diff] [blame] | 496 | static int ps8622_attach(struct drm_bridge *bridge) |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 497 | { |
| 498 | struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); |
| 499 | int ret; |
| 500 | |
| 501 | if (!bridge->encoder) { |
| 502 | DRM_ERROR("Parent encoder object not found"); |
| 503 | return -ENODEV; |
| 504 | } |
| 505 | |
| 506 | ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD; |
| 507 | ret = drm_connector_init(bridge->dev, &ps8622->connector, |
| 508 | &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS); |
| 509 | if (ret) { |
| 510 | DRM_ERROR("Failed to initialize connector with drm\n"); |
| 511 | return ret; |
| 512 | } |
| 513 | drm_connector_helper_add(&ps8622->connector, |
| 514 | &ps8622_connector_helper_funcs); |
| 515 | drm_connector_register(&ps8622->connector); |
| 516 | drm_mode_connector_attach_encoder(&ps8622->connector, |
| 517 | bridge->encoder); |
| 518 | |
| 519 | if (ps8622->panel) |
| 520 | drm_panel_attach(ps8622->panel, &ps8622->connector); |
| 521 | |
| 522 | drm_helper_hpd_irq_event(ps8622->connector.dev); |
| 523 | |
| 524 | return ret; |
| 525 | } |
| 526 | |
| 527 | static const struct drm_bridge_funcs ps8622_bridge_funcs = { |
| 528 | .pre_enable = ps8622_pre_enable, |
| 529 | .enable = ps8622_enable, |
| 530 | .disable = ps8622_disable, |
| 531 | .post_disable = ps8622_post_disable, |
| 532 | .attach = ps8622_attach, |
| 533 | }; |
| 534 | |
| 535 | static const struct of_device_id ps8622_devices[] = { |
| 536 | {.compatible = "parade,ps8622",}, |
| 537 | {.compatible = "parade,ps8625",}, |
| 538 | {} |
| 539 | }; |
| 540 | MODULE_DEVICE_TABLE(of, ps8622_devices); |
| 541 | |
| 542 | static int ps8622_probe(struct i2c_client *client, |
| 543 | const struct i2c_device_id *id) |
| 544 | { |
| 545 | struct device *dev = &client->dev; |
| 546 | struct device_node *endpoint, *panel_node; |
| 547 | struct ps8622_bridge *ps8622; |
| 548 | int ret; |
| 549 | |
| 550 | ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL); |
| 551 | if (!ps8622) |
| 552 | return -ENOMEM; |
| 553 | |
| 554 | endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); |
| 555 | if (endpoint) { |
| 556 | panel_node = of_graph_get_remote_port_parent(endpoint); |
| 557 | if (panel_node) { |
| 558 | ps8622->panel = of_drm_find_panel(panel_node); |
| 559 | of_node_put(panel_node); |
| 560 | if (!ps8622->panel) |
| 561 | return -EPROBE_DEFER; |
| 562 | } |
| 563 | } |
| 564 | |
| 565 | ps8622->client = client; |
| 566 | |
| 567 | ps8622->v12 = devm_regulator_get(dev, "vdd12"); |
| 568 | if (IS_ERR(ps8622->v12)) { |
| 569 | dev_info(dev, "no 1.2v regulator found for PS8622\n"); |
| 570 | ps8622->v12 = NULL; |
| 571 | } |
| 572 | |
Uwe Kleine-König | a92bf30 | 2015-05-19 09:03:49 +0200 | [diff] [blame] | 573 | ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH); |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 574 | if (IS_ERR(ps8622->gpio_slp)) { |
| 575 | ret = PTR_ERR(ps8622->gpio_slp); |
| 576 | dev_err(dev, "cannot get gpio_slp %d\n", ret); |
| 577 | return ret; |
| 578 | } |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 579 | |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 580 | /* |
| 581 | * Assert the reset pin high to avoid the bridge being |
| 582 | * initialized prematurely |
| 583 | */ |
Uwe Kleine-König | a92bf30 | 2015-05-19 09:03:49 +0200 | [diff] [blame] | 584 | ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); |
| 585 | if (IS_ERR(ps8622->gpio_rst)) { |
| 586 | ret = PTR_ERR(ps8622->gpio_rst); |
| 587 | dev_err(dev, "cannot get gpio_rst %d\n", ret); |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 588 | return ret; |
| 589 | } |
| 590 | |
| 591 | ps8622->max_lane_count = id->driver_data; |
| 592 | |
| 593 | if (of_property_read_u32(dev->of_node, "lane-count", |
| 594 | &ps8622->lane_count)) { |
| 595 | ps8622->lane_count = ps8622->max_lane_count; |
| 596 | } else if (ps8622->lane_count > ps8622->max_lane_count) { |
| 597 | dev_info(dev, "lane-count property is too high," |
| 598 | "using max_lane_count\n"); |
| 599 | ps8622->lane_count = ps8622->max_lane_count; |
| 600 | } |
| 601 | |
| 602 | if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) { |
| 603 | ps8622->bl = backlight_device_register("ps8622-backlight", |
| 604 | dev, ps8622, &ps8622_backlight_ops, |
| 605 | NULL); |
| 606 | if (IS_ERR(ps8622->bl)) { |
| 607 | DRM_ERROR("failed to register backlight\n"); |
| 608 | ret = PTR_ERR(ps8622->bl); |
| 609 | ps8622->bl = NULL; |
| 610 | return ret; |
| 611 | } |
| 612 | ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS; |
| 613 | ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS; |
| 614 | } |
| 615 | |
| 616 | ps8622->bridge.funcs = &ps8622_bridge_funcs; |
| 617 | ps8622->bridge.of_node = dev->of_node; |
| 618 | ret = drm_bridge_add(&ps8622->bridge); |
| 619 | if (ret) { |
| 620 | DRM_ERROR("Failed to add bridge\n"); |
| 621 | return ret; |
| 622 | } |
| 623 | |
| 624 | i2c_set_clientdata(client, ps8622); |
| 625 | |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | static int ps8622_remove(struct i2c_client *client) |
| 630 | { |
| 631 | struct ps8622_bridge *ps8622 = i2c_get_clientdata(client); |
| 632 | |
Markus Elfring | 4cf090e | 2016-07-22 14:45:51 +0200 | [diff] [blame] | 633 | backlight_device_unregister(ps8622->bl); |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 634 | drm_bridge_remove(&ps8622->bridge); |
| 635 | |
| 636 | return 0; |
| 637 | } |
| 638 | |
| 639 | static const struct i2c_device_id ps8622_i2c_table[] = { |
| 640 | /* Device type, max_lane_count */ |
| 641 | {"ps8622", 1}, |
| 642 | {"ps8625", 2}, |
| 643 | {}, |
| 644 | }; |
| 645 | MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table); |
| 646 | |
Thierry Reding | 8a7d56b | 2015-01-30 12:29:09 +0100 | [diff] [blame] | 647 | static struct i2c_driver ps8622_driver = { |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 648 | .id_table = ps8622_i2c_table, |
| 649 | .probe = ps8622_probe, |
| 650 | .remove = ps8622_remove, |
| 651 | .driver = { |
| 652 | .name = "ps8622", |
Vincent Palatin | b2ea877 | 2015-01-20 22:08:53 +0530 | [diff] [blame] | 653 | .of_match_table = ps8622_devices, |
| 654 | }, |
| 655 | }; |
| 656 | module_i2c_driver(ps8622_driver); |
| 657 | |
| 658 | MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>"); |
| 659 | MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver"); |
| 660 | MODULE_LICENSE("GPL v2"); |