19c92ab61SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2330b48bdSThierry Reding /* 3330b48bdSThierry Reding * Parade PS8622 eDP/LVDS bridge driver 4330b48bdSThierry Reding * 5330b48bdSThierry Reding * Copyright (C) 2014 Google, Inc. 6330b48bdSThierry Reding */ 7330b48bdSThierry Reding 8330b48bdSThierry Reding #include <linux/backlight.h> 9330b48bdSThierry Reding #include <linux/delay.h> 10330b48bdSThierry Reding #include <linux/err.h> 11330b48bdSThierry Reding #include <linux/gpio.h> 12330b48bdSThierry Reding #include <linux/gpio/consumer.h> 13330b48bdSThierry Reding #include <linux/i2c.h> 14330b48bdSThierry Reding #include <linux/module.h> 15330b48bdSThierry Reding #include <linux/of.h> 16330b48bdSThierry Reding #include <linux/of_device.h> 17330b48bdSThierry Reding #include <linux/pm.h> 18330b48bdSThierry Reding #include <linux/regulator/consumer.h> 19191436c4SMasahiro Yamada #include <drm/drm_atomic_helper.h> 20191436c4SMasahiro Yamada #include <drm/drm_crtc.h> 21ebc94461SRob Herring #include <drm/drm_of.h> 22330b48bdSThierry Reding #include <drm/drm_panel.h> 23fcd70cd3SDaniel Vetter #include <drm/drm_probe_helper.h> 24191436c4SMasahiro Yamada #include <drm/drmP.h> 25330b48bdSThierry Reding 26330b48bdSThierry Reding /* Brightness scale on the Parade chip */ 27330b48bdSThierry Reding #define PS8622_MAX_BRIGHTNESS 0xff 28330b48bdSThierry Reding 29330b48bdSThierry Reding /* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */ 30330b48bdSThierry Reding #define PS8622_POWER_RISE_T1_MIN_US 10 31330b48bdSThierry Reding #define PS8622_POWER_RISE_T1_MAX_US 10000 32330b48bdSThierry Reding #define PS8622_RST_HIGH_T2_MIN_US 3000 33330b48bdSThierry Reding #define PS8622_RST_HIGH_T2_MAX_US 30000 34330b48bdSThierry Reding #define PS8622_PWMO_END_T12_MS 200 35330b48bdSThierry Reding #define PS8622_POWER_FALL_T16_MAX_US 10000 36330b48bdSThierry Reding #define PS8622_POWER_OFF_T17_MS 500 37330b48bdSThierry Reding 38330b48bdSThierry Reding #if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \ 39330b48bdSThierry Reding (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US)) 40330b48bdSThierry Reding #error "T2.min + T1.max must be less than T2.max + T1.min" 41330b48bdSThierry Reding #endif 42330b48bdSThierry Reding 43330b48bdSThierry Reding struct ps8622_bridge { 44330b48bdSThierry Reding struct drm_connector connector; 45330b48bdSThierry Reding struct i2c_client *client; 46330b48bdSThierry Reding struct drm_bridge bridge; 47330b48bdSThierry Reding struct drm_panel *panel; 48330b48bdSThierry Reding struct regulator *v12; 49330b48bdSThierry Reding struct backlight_device *bl; 50330b48bdSThierry Reding 51330b48bdSThierry Reding struct gpio_desc *gpio_slp; 52330b48bdSThierry Reding struct gpio_desc *gpio_rst; 53330b48bdSThierry Reding 54330b48bdSThierry Reding u32 max_lane_count; 55330b48bdSThierry Reding u32 lane_count; 56330b48bdSThierry Reding 57330b48bdSThierry Reding bool enabled; 58330b48bdSThierry Reding }; 59330b48bdSThierry Reding 60330b48bdSThierry Reding static inline struct ps8622_bridge * 61330b48bdSThierry Reding bridge_to_ps8622(struct drm_bridge *bridge) 62330b48bdSThierry Reding { 63330b48bdSThierry Reding return container_of(bridge, struct ps8622_bridge, bridge); 64330b48bdSThierry Reding } 65330b48bdSThierry Reding 66330b48bdSThierry Reding static inline struct ps8622_bridge * 67330b48bdSThierry Reding connector_to_ps8622(struct drm_connector *connector) 68330b48bdSThierry Reding { 69330b48bdSThierry Reding return container_of(connector, struct ps8622_bridge, connector); 70330b48bdSThierry Reding } 71330b48bdSThierry Reding 72330b48bdSThierry Reding static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val) 73330b48bdSThierry Reding { 74330b48bdSThierry Reding int ret; 75330b48bdSThierry Reding struct i2c_adapter *adap = client->adapter; 76330b48bdSThierry Reding struct i2c_msg msg; 77330b48bdSThierry Reding u8 data[] = {reg, val}; 78330b48bdSThierry Reding 79330b48bdSThierry Reding msg.addr = client->addr + page; 80330b48bdSThierry Reding msg.flags = 0; 81330b48bdSThierry Reding msg.len = sizeof(data); 82330b48bdSThierry Reding msg.buf = data; 83330b48bdSThierry Reding 84330b48bdSThierry Reding ret = i2c_transfer(adap, &msg, 1); 85330b48bdSThierry Reding if (ret != 1) 86330b48bdSThierry Reding pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n", 87330b48bdSThierry Reding client->addr + page, reg, val, ret); 88330b48bdSThierry Reding return !(ret == 1); 89330b48bdSThierry Reding } 90330b48bdSThierry Reding 91330b48bdSThierry Reding static int ps8622_send_config(struct ps8622_bridge *ps8622) 92330b48bdSThierry Reding { 93330b48bdSThierry Reding struct i2c_client *cl = ps8622->client; 94330b48bdSThierry Reding int err = 0; 95330b48bdSThierry Reding 96330b48bdSThierry Reding /* HPD low */ 97330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xa1, 0x01); 98330b48bdSThierry Reding if (err) 99330b48bdSThierry Reding goto error; 100330b48bdSThierry Reding 101330b48bdSThierry Reding /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */ 102330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x14, 0x01); 103330b48bdSThierry Reding if (err) 104330b48bdSThierry Reding goto error; 105330b48bdSThierry Reding 106330b48bdSThierry Reding /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */ 107330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xe3, 0x20); 108330b48bdSThierry Reding if (err) 109330b48bdSThierry Reding goto error; 110330b48bdSThierry Reding 111330b48bdSThierry Reding /* [7] RCO SS enable */ 112330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xe2, 0x80); 113330b48bdSThierry Reding if (err) 114330b48bdSThierry Reding goto error; 115330b48bdSThierry Reding 116330b48bdSThierry Reding /* RPHY Setting 117330b48bdSThierry Reding * [3:2] CDR tune wait cycle before measure for fine tune 118330b48bdSThierry Reding * b00: 1us b01: 0.5us b10:2us, b11: 4us 119330b48bdSThierry Reding */ 120330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x8a, 0x0c); 121330b48bdSThierry Reding if (err) 122330b48bdSThierry Reding goto error; 123330b48bdSThierry Reding 124330b48bdSThierry Reding /* [3] RFD always on */ 125330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x89, 0x08); 126330b48bdSThierry Reding if (err) 127330b48bdSThierry Reding goto error; 128330b48bdSThierry Reding 129330b48bdSThierry Reding /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */ 130330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x71, 0x2d); 131330b48bdSThierry Reding if (err) 132330b48bdSThierry Reding goto error; 133330b48bdSThierry Reding 134330b48bdSThierry Reding /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */ 135330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7d, 0x07); 136330b48bdSThierry Reding if (err) 137330b48bdSThierry Reding goto error; 138330b48bdSThierry Reding 139330b48bdSThierry Reding /* [1:0] Fmin=+4bands */ 140330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7b, 0x00); 141330b48bdSThierry Reding if (err) 142330b48bdSThierry Reding goto error; 143330b48bdSThierry Reding 144330b48bdSThierry Reding /* [7:5] DCO_FTRNG=+-40% */ 145330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7a, 0xfd); 146330b48bdSThierry Reding if (err) 147330b48bdSThierry Reding goto error; 148330b48bdSThierry Reding 149330b48bdSThierry Reding /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */ 150330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc0, 0x12); 151330b48bdSThierry Reding if (err) 152330b48bdSThierry Reding goto error; 153330b48bdSThierry Reding 154330b48bdSThierry Reding /* Gitune=-37% */ 155330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc1, 0x92); 156330b48bdSThierry Reding if (err) 157330b48bdSThierry Reding goto error; 158330b48bdSThierry Reding 159330b48bdSThierry Reding /* Fbstep=100% */ 160330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc2, 0x1c); 161330b48bdSThierry Reding if (err) 162330b48bdSThierry Reding goto error; 163330b48bdSThierry Reding 164330b48bdSThierry Reding /* [7] LOS signal disable */ 165330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x32, 0x80); 166330b48bdSThierry Reding if (err) 167330b48bdSThierry Reding goto error; 168330b48bdSThierry Reding 169330b48bdSThierry Reding /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */ 170330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x00, 0xb0); 171330b48bdSThierry Reding if (err) 172330b48bdSThierry Reding goto error; 173330b48bdSThierry Reding 174330b48bdSThierry Reding /* [7:6] Right-bar GPIO output strength is 8mA */ 175330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x15, 0x40); 176330b48bdSThierry Reding if (err) 177330b48bdSThierry Reding goto error; 178330b48bdSThierry Reding 179330b48bdSThierry Reding /* EQ Training State Machine Setting, RCO calibration start */ 180330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x54, 0x10); 181330b48bdSThierry Reding if (err) 182330b48bdSThierry Reding goto error; 183330b48bdSThierry Reding 184330b48bdSThierry Reding /* Logic, needs more than 10 I2C command */ 185330b48bdSThierry Reding /* [4:0] MAX_LANE_COUNT set to max supported lanes */ 186330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count); 187330b48bdSThierry Reding if (err) 188330b48bdSThierry Reding goto error; 189330b48bdSThierry Reding 190330b48bdSThierry Reding /* [4:0] LANE_COUNT_SET set to chosen lane count */ 191330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count); 192330b48bdSThierry Reding if (err) 193330b48bdSThierry Reding goto error; 194330b48bdSThierry Reding 195330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x52, 0x20); 196330b48bdSThierry Reding if (err) 197330b48bdSThierry Reding goto error; 198330b48bdSThierry Reding 199330b48bdSThierry Reding /* HPD CP toggle enable */ 200330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0xf1, 0x03); 201330b48bdSThierry Reding if (err) 202330b48bdSThierry Reding goto error; 203330b48bdSThierry Reding 204330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x62, 0x41); 205330b48bdSThierry Reding if (err) 206330b48bdSThierry Reding goto error; 207330b48bdSThierry Reding 208330b48bdSThierry Reding /* Counter number, add 1ms counter delay */ 209330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0xf6, 0x01); 210330b48bdSThierry Reding if (err) 211330b48bdSThierry Reding goto error; 212330b48bdSThierry Reding 213330b48bdSThierry Reding /* [6]PWM function control by DPCD0040f[7], default is PWM block */ 214330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x77, 0x06); 215330b48bdSThierry Reding if (err) 216330b48bdSThierry Reding goto error; 217330b48bdSThierry Reding 218330b48bdSThierry Reding /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */ 219330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x4c, 0x04); 220330b48bdSThierry Reding if (err) 221330b48bdSThierry Reding goto error; 222330b48bdSThierry Reding 223330b48bdSThierry Reding /* DPCD00400='h00, Parade OUI ='h001cf8 */ 224330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc0, 0x00); 225330b48bdSThierry Reding if (err) 226330b48bdSThierry Reding goto error; 227330b48bdSThierry Reding 228330b48bdSThierry Reding /* DPCD00401='h1c */ 229330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc1, 0x1c); 230330b48bdSThierry Reding if (err) 231330b48bdSThierry Reding goto error; 232330b48bdSThierry Reding 233330b48bdSThierry Reding /* DPCD00402='hf8 */ 234330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc2, 0xf8); 235330b48bdSThierry Reding if (err) 236330b48bdSThierry Reding goto error; 237330b48bdSThierry Reding 238330b48bdSThierry Reding /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */ 239330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc3, 0x44); 240330b48bdSThierry Reding if (err) 241330b48bdSThierry Reding goto error; 242330b48bdSThierry Reding 243330b48bdSThierry Reding /* DPCD404 */ 244330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc4, 0x32); 245330b48bdSThierry Reding if (err) 246330b48bdSThierry Reding goto error; 247330b48bdSThierry Reding 248330b48bdSThierry Reding /* DPCD405 */ 249330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc5, 0x53); 250330b48bdSThierry Reding if (err) 251330b48bdSThierry Reding goto error; 252330b48bdSThierry Reding 253330b48bdSThierry Reding /* DPCD406 */ 254330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc6, 0x4c); 255330b48bdSThierry Reding if (err) 256330b48bdSThierry Reding goto error; 257330b48bdSThierry Reding 258330b48bdSThierry Reding /* DPCD407 */ 259330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc7, 0x56); 260330b48bdSThierry Reding if (err) 261330b48bdSThierry Reding goto error; 262330b48bdSThierry Reding 263330b48bdSThierry Reding /* DPCD408 */ 264330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc8, 0x35); 265330b48bdSThierry Reding if (err) 266330b48bdSThierry Reding goto error; 267330b48bdSThierry Reding 268330b48bdSThierry Reding /* DPCD40A, Initial Code major revision '01' */ 269330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xca, 0x01); 270330b48bdSThierry Reding if (err) 271330b48bdSThierry Reding goto error; 272330b48bdSThierry Reding 273330b48bdSThierry Reding /* DPCD40B, Initial Code minor revision '05' */ 274330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xcb, 0x05); 275330b48bdSThierry Reding if (err) 276330b48bdSThierry Reding goto error; 277330b48bdSThierry Reding 278330b48bdSThierry Reding 279330b48bdSThierry Reding if (ps8622->bl) { 280330b48bdSThierry Reding /* DPCD720, internal PWM */ 281330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa5, 0xa0); 282330b48bdSThierry Reding if (err) 283330b48bdSThierry Reding goto error; 284330b48bdSThierry Reding 285330b48bdSThierry Reding /* FFh for 100% brightness, 0h for 0% brightness */ 286330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa7, 287330b48bdSThierry Reding ps8622->bl->props.brightness); 288330b48bdSThierry Reding if (err) 289330b48bdSThierry Reding goto error; 290330b48bdSThierry Reding } else { 291330b48bdSThierry Reding /* DPCD720, external PWM */ 292330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa5, 0x80); 293330b48bdSThierry Reding if (err) 294330b48bdSThierry Reding goto error; 295330b48bdSThierry Reding } 296330b48bdSThierry Reding 297330b48bdSThierry Reding /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */ 298330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xcc, 0x13); 299330b48bdSThierry Reding if (err) 300330b48bdSThierry Reding goto error; 301330b48bdSThierry Reding 302330b48bdSThierry Reding /* Enable SSC set by register */ 303330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xb1, 0x20); 304330b48bdSThierry Reding if (err) 305330b48bdSThierry Reding goto error; 306330b48bdSThierry Reding 307330b48bdSThierry Reding /* Set SSC enabled and +/-1% central spreading */ 308330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x10, 0x16); 309330b48bdSThierry Reding if (err) 310330b48bdSThierry Reding goto error; 311330b48bdSThierry Reding 312330b48bdSThierry Reding /* Logic end */ 313330b48bdSThierry Reding /* MPU Clock source: LC => RCO */ 314330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x59, 0x60); 315330b48bdSThierry Reding if (err) 316330b48bdSThierry Reding goto error; 317330b48bdSThierry Reding 318330b48bdSThierry Reding /* LC -> RCO */ 319330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x54, 0x14); 320330b48bdSThierry Reding if (err) 321330b48bdSThierry Reding goto error; 322330b48bdSThierry Reding 323330b48bdSThierry Reding /* HPD high */ 324330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xa1, 0x91); 325330b48bdSThierry Reding 326330b48bdSThierry Reding error: 327330b48bdSThierry Reding return err ? -EIO : 0; 328330b48bdSThierry Reding } 329330b48bdSThierry Reding 330330b48bdSThierry Reding static int ps8622_backlight_update(struct backlight_device *bl) 331330b48bdSThierry Reding { 332330b48bdSThierry Reding struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev); 333330b48bdSThierry Reding int ret, brightness = bl->props.brightness; 334330b48bdSThierry Reding 335330b48bdSThierry Reding if (bl->props.power != FB_BLANK_UNBLANK || 336330b48bdSThierry Reding bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) 337330b48bdSThierry Reding brightness = 0; 338330b48bdSThierry Reding 339330b48bdSThierry Reding if (!ps8622->enabled) 340330b48bdSThierry Reding return -EINVAL; 341330b48bdSThierry Reding 342330b48bdSThierry Reding ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness); 343330b48bdSThierry Reding 344330b48bdSThierry Reding return ret; 345330b48bdSThierry Reding } 346330b48bdSThierry Reding 347330b48bdSThierry Reding static const struct backlight_ops ps8622_backlight_ops = { 348330b48bdSThierry Reding .update_status = ps8622_backlight_update, 349330b48bdSThierry Reding }; 350330b48bdSThierry Reding 351330b48bdSThierry Reding static void ps8622_pre_enable(struct drm_bridge *bridge) 352330b48bdSThierry Reding { 353330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 354330b48bdSThierry Reding int ret; 355330b48bdSThierry Reding 356330b48bdSThierry Reding if (ps8622->enabled) 357330b48bdSThierry Reding return; 358330b48bdSThierry Reding 359330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 0); 360330b48bdSThierry Reding 361330b48bdSThierry Reding if (ps8622->v12) { 362330b48bdSThierry Reding ret = regulator_enable(ps8622->v12); 363330b48bdSThierry Reding if (ret) 364330b48bdSThierry Reding DRM_ERROR("fails to enable ps8622->v12"); 365330b48bdSThierry Reding } 366330b48bdSThierry Reding 367330b48bdSThierry Reding if (drm_panel_prepare(ps8622->panel)) { 368330b48bdSThierry Reding DRM_ERROR("failed to prepare panel\n"); 369330b48bdSThierry Reding return; 370330b48bdSThierry Reding } 371330b48bdSThierry Reding 372330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_slp, 1); 373330b48bdSThierry Reding 374330b48bdSThierry Reding /* 375330b48bdSThierry Reding * T1 is the range of time that it takes for the power to rise after we 376330b48bdSThierry Reding * enable the lcd/ps8622 fet. T2 is the range of time in which the 377330b48bdSThierry Reding * data sheet specifies we should deassert the reset pin. 378330b48bdSThierry Reding * 379330b48bdSThierry Reding * If it takes T1.max for the power to rise, we need to wait atleast 380330b48bdSThierry Reding * T2.min before deasserting the reset pin. If it takes T1.min for the 381330b48bdSThierry Reding * power to rise, we need to wait at most T2.max before deasserting the 382330b48bdSThierry Reding * reset pin. 383330b48bdSThierry Reding */ 384330b48bdSThierry Reding usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US, 385330b48bdSThierry Reding PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US); 386330b48bdSThierry Reding 387330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 1); 388330b48bdSThierry Reding 389330b48bdSThierry Reding /* wait 20ms after RST high */ 390330b48bdSThierry Reding usleep_range(20000, 30000); 391330b48bdSThierry Reding 392330b48bdSThierry Reding ret = ps8622_send_config(ps8622); 393330b48bdSThierry Reding if (ret) { 394330b48bdSThierry Reding DRM_ERROR("Failed to send config to bridge (%d)\n", ret); 395330b48bdSThierry Reding return; 396330b48bdSThierry Reding } 397330b48bdSThierry Reding 398330b48bdSThierry Reding ps8622->enabled = true; 399330b48bdSThierry Reding } 400330b48bdSThierry Reding 401330b48bdSThierry Reding static void ps8622_enable(struct drm_bridge *bridge) 402330b48bdSThierry Reding { 403330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 404330b48bdSThierry Reding 405330b48bdSThierry Reding if (drm_panel_enable(ps8622->panel)) { 406330b48bdSThierry Reding DRM_ERROR("failed to enable panel\n"); 407330b48bdSThierry Reding return; 408330b48bdSThierry Reding } 409330b48bdSThierry Reding } 410330b48bdSThierry Reding 411330b48bdSThierry Reding static void ps8622_disable(struct drm_bridge *bridge) 412330b48bdSThierry Reding { 413330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 414330b48bdSThierry Reding 415330b48bdSThierry Reding if (drm_panel_disable(ps8622->panel)) { 416330b48bdSThierry Reding DRM_ERROR("failed to disable panel\n"); 417330b48bdSThierry Reding return; 418330b48bdSThierry Reding } 419330b48bdSThierry Reding msleep(PS8622_PWMO_END_T12_MS); 420330b48bdSThierry Reding } 421330b48bdSThierry Reding 422330b48bdSThierry Reding static void ps8622_post_disable(struct drm_bridge *bridge) 423330b48bdSThierry Reding { 424330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 425330b48bdSThierry Reding 426330b48bdSThierry Reding if (!ps8622->enabled) 427330b48bdSThierry Reding return; 428330b48bdSThierry Reding 429330b48bdSThierry Reding ps8622->enabled = false; 430330b48bdSThierry Reding 431330b48bdSThierry Reding /* 432330b48bdSThierry Reding * This doesn't matter if the regulators are turned off, but something 433330b48bdSThierry Reding * else might keep them on. In that case, we want to assert the slp gpio 434330b48bdSThierry Reding * to lower power. 435330b48bdSThierry Reding */ 436330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_slp, 0); 437330b48bdSThierry Reding 438330b48bdSThierry Reding if (drm_panel_unprepare(ps8622->panel)) { 439330b48bdSThierry Reding DRM_ERROR("failed to unprepare panel\n"); 440330b48bdSThierry Reding return; 441330b48bdSThierry Reding } 442330b48bdSThierry Reding 443330b48bdSThierry Reding if (ps8622->v12) 444330b48bdSThierry Reding regulator_disable(ps8622->v12); 445330b48bdSThierry Reding 446330b48bdSThierry Reding /* 447330b48bdSThierry Reding * Sleep for at least the amount of time that it takes the power rail to 448330b48bdSThierry Reding * fall to prevent asserting the rst gpio from doing anything. 449330b48bdSThierry Reding */ 450330b48bdSThierry Reding usleep_range(PS8622_POWER_FALL_T16_MAX_US, 451330b48bdSThierry Reding 2 * PS8622_POWER_FALL_T16_MAX_US); 452330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 0); 453330b48bdSThierry Reding 454330b48bdSThierry Reding msleep(PS8622_POWER_OFF_T17_MS); 455330b48bdSThierry Reding } 456330b48bdSThierry Reding 457330b48bdSThierry Reding static int ps8622_get_modes(struct drm_connector *connector) 458330b48bdSThierry Reding { 459330b48bdSThierry Reding struct ps8622_bridge *ps8622; 460330b48bdSThierry Reding 461330b48bdSThierry Reding ps8622 = connector_to_ps8622(connector); 462330b48bdSThierry Reding 463330b48bdSThierry Reding return drm_panel_get_modes(ps8622->panel); 464330b48bdSThierry Reding } 465330b48bdSThierry Reding 466330b48bdSThierry Reding static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = { 467330b48bdSThierry Reding .get_modes = ps8622_get_modes, 468330b48bdSThierry Reding }; 469330b48bdSThierry Reding 470330b48bdSThierry Reding static const struct drm_connector_funcs ps8622_connector_funcs = { 471330b48bdSThierry Reding .fill_modes = drm_helper_probe_single_connector_modes, 472bf3b123eSMarek Vasut .destroy = drm_connector_cleanup, 473330b48bdSThierry Reding .reset = drm_atomic_helper_connector_reset, 474330b48bdSThierry Reding .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 475330b48bdSThierry Reding .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 476330b48bdSThierry Reding }; 477330b48bdSThierry Reding 478330b48bdSThierry Reding static int ps8622_attach(struct drm_bridge *bridge) 479330b48bdSThierry Reding { 480330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 481330b48bdSThierry Reding int ret; 482330b48bdSThierry Reding 483330b48bdSThierry Reding if (!bridge->encoder) { 484330b48bdSThierry Reding DRM_ERROR("Parent encoder object not found"); 485330b48bdSThierry Reding return -ENODEV; 486330b48bdSThierry Reding } 487330b48bdSThierry Reding 488330b48bdSThierry Reding ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD; 489330b48bdSThierry Reding ret = drm_connector_init(bridge->dev, &ps8622->connector, 490330b48bdSThierry Reding &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS); 491330b48bdSThierry Reding if (ret) { 492330b48bdSThierry Reding DRM_ERROR("Failed to initialize connector with drm\n"); 493330b48bdSThierry Reding return ret; 494330b48bdSThierry Reding } 495330b48bdSThierry Reding drm_connector_helper_add(&ps8622->connector, 496330b48bdSThierry Reding &ps8622_connector_helper_funcs); 497330b48bdSThierry Reding drm_connector_register(&ps8622->connector); 498cde4c44dSDaniel Vetter drm_connector_attach_encoder(&ps8622->connector, 499330b48bdSThierry Reding bridge->encoder); 500330b48bdSThierry Reding 501330b48bdSThierry Reding if (ps8622->panel) 502330b48bdSThierry Reding drm_panel_attach(ps8622->panel, &ps8622->connector); 503330b48bdSThierry Reding 504330b48bdSThierry Reding drm_helper_hpd_irq_event(ps8622->connector.dev); 505330b48bdSThierry Reding 506330b48bdSThierry Reding return ret; 507330b48bdSThierry Reding } 508330b48bdSThierry Reding 509330b48bdSThierry Reding static const struct drm_bridge_funcs ps8622_bridge_funcs = { 510330b48bdSThierry Reding .pre_enable = ps8622_pre_enable, 511330b48bdSThierry Reding .enable = ps8622_enable, 512330b48bdSThierry Reding .disable = ps8622_disable, 513330b48bdSThierry Reding .post_disable = ps8622_post_disable, 514330b48bdSThierry Reding .attach = ps8622_attach, 515330b48bdSThierry Reding }; 516330b48bdSThierry Reding 517330b48bdSThierry Reding static const struct of_device_id ps8622_devices[] = { 518330b48bdSThierry Reding {.compatible = "parade,ps8622",}, 519330b48bdSThierry Reding {.compatible = "parade,ps8625",}, 520330b48bdSThierry Reding {} 521330b48bdSThierry Reding }; 522330b48bdSThierry Reding MODULE_DEVICE_TABLE(of, ps8622_devices); 523330b48bdSThierry Reding 524330b48bdSThierry Reding static int ps8622_probe(struct i2c_client *client, 525330b48bdSThierry Reding const struct i2c_device_id *id) 526330b48bdSThierry Reding { 527330b48bdSThierry Reding struct device *dev = &client->dev; 528330b48bdSThierry Reding struct ps8622_bridge *ps8622; 529330b48bdSThierry Reding int ret; 530330b48bdSThierry Reding 531330b48bdSThierry Reding ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL); 532330b48bdSThierry Reding if (!ps8622) 533330b48bdSThierry Reding return -ENOMEM; 534330b48bdSThierry Reding 535ebc94461SRob Herring ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL); 536ebc94461SRob Herring if (ret) 537ebc94461SRob Herring return ret; 538330b48bdSThierry Reding 539330b48bdSThierry Reding ps8622->client = client; 540330b48bdSThierry Reding 541330b48bdSThierry Reding ps8622->v12 = devm_regulator_get(dev, "vdd12"); 542330b48bdSThierry Reding if (IS_ERR(ps8622->v12)) { 543330b48bdSThierry Reding dev_info(dev, "no 1.2v regulator found for PS8622\n"); 544330b48bdSThierry Reding ps8622->v12 = NULL; 545330b48bdSThierry Reding } 546330b48bdSThierry Reding 547330b48bdSThierry Reding ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH); 548330b48bdSThierry Reding if (IS_ERR(ps8622->gpio_slp)) { 549330b48bdSThierry Reding ret = PTR_ERR(ps8622->gpio_slp); 550330b48bdSThierry Reding dev_err(dev, "cannot get gpio_slp %d\n", ret); 551330b48bdSThierry Reding return ret; 552330b48bdSThierry Reding } 553330b48bdSThierry Reding 554330b48bdSThierry Reding /* 555330b48bdSThierry Reding * Assert the reset pin high to avoid the bridge being 556330b48bdSThierry Reding * initialized prematurely 557330b48bdSThierry Reding */ 558330b48bdSThierry Reding ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); 559330b48bdSThierry Reding if (IS_ERR(ps8622->gpio_rst)) { 560330b48bdSThierry Reding ret = PTR_ERR(ps8622->gpio_rst); 561330b48bdSThierry Reding dev_err(dev, "cannot get gpio_rst %d\n", ret); 562330b48bdSThierry Reding return ret; 563330b48bdSThierry Reding } 564330b48bdSThierry Reding 565330b48bdSThierry Reding ps8622->max_lane_count = id->driver_data; 566330b48bdSThierry Reding 567330b48bdSThierry Reding if (of_property_read_u32(dev->of_node, "lane-count", 568330b48bdSThierry Reding &ps8622->lane_count)) { 569330b48bdSThierry Reding ps8622->lane_count = ps8622->max_lane_count; 570330b48bdSThierry Reding } else if (ps8622->lane_count > ps8622->max_lane_count) { 571330b48bdSThierry Reding dev_info(dev, "lane-count property is too high," 572330b48bdSThierry Reding "using max_lane_count\n"); 573330b48bdSThierry Reding ps8622->lane_count = ps8622->max_lane_count; 574330b48bdSThierry Reding } 575330b48bdSThierry Reding 576330b48bdSThierry Reding if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) { 577330b48bdSThierry Reding ps8622->bl = backlight_device_register("ps8622-backlight", 578330b48bdSThierry Reding dev, ps8622, &ps8622_backlight_ops, 579330b48bdSThierry Reding NULL); 580330b48bdSThierry Reding if (IS_ERR(ps8622->bl)) { 581330b48bdSThierry Reding DRM_ERROR("failed to register backlight\n"); 582330b48bdSThierry Reding ret = PTR_ERR(ps8622->bl); 583330b48bdSThierry Reding ps8622->bl = NULL; 584330b48bdSThierry Reding return ret; 585330b48bdSThierry Reding } 586330b48bdSThierry Reding ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS; 587330b48bdSThierry Reding ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS; 588330b48bdSThierry Reding } 589330b48bdSThierry Reding 590330b48bdSThierry Reding ps8622->bridge.funcs = &ps8622_bridge_funcs; 591330b48bdSThierry Reding ps8622->bridge.of_node = dev->of_node; 592d0ceb3ecSInki Dae drm_bridge_add(&ps8622->bridge); 593330b48bdSThierry Reding 594330b48bdSThierry Reding i2c_set_clientdata(client, ps8622); 595330b48bdSThierry Reding 596330b48bdSThierry Reding return 0; 597330b48bdSThierry Reding } 598330b48bdSThierry Reding 599330b48bdSThierry Reding static int ps8622_remove(struct i2c_client *client) 600330b48bdSThierry Reding { 601330b48bdSThierry Reding struct ps8622_bridge *ps8622 = i2c_get_clientdata(client); 602330b48bdSThierry Reding 603330b48bdSThierry Reding backlight_device_unregister(ps8622->bl); 604330b48bdSThierry Reding drm_bridge_remove(&ps8622->bridge); 605330b48bdSThierry Reding 606330b48bdSThierry Reding return 0; 607330b48bdSThierry Reding } 608330b48bdSThierry Reding 609330b48bdSThierry Reding static const struct i2c_device_id ps8622_i2c_table[] = { 610330b48bdSThierry Reding /* Device type, max_lane_count */ 611330b48bdSThierry Reding {"ps8622", 1}, 612330b48bdSThierry Reding {"ps8625", 2}, 613330b48bdSThierry Reding {}, 614330b48bdSThierry Reding }; 615330b48bdSThierry Reding MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table); 616330b48bdSThierry Reding 617330b48bdSThierry Reding static struct i2c_driver ps8622_driver = { 618330b48bdSThierry Reding .id_table = ps8622_i2c_table, 619330b48bdSThierry Reding .probe = ps8622_probe, 620330b48bdSThierry Reding .remove = ps8622_remove, 621330b48bdSThierry Reding .driver = { 622330b48bdSThierry Reding .name = "ps8622", 623330b48bdSThierry Reding .of_match_table = ps8622_devices, 624330b48bdSThierry Reding }, 625330b48bdSThierry Reding }; 626330b48bdSThierry Reding module_i2c_driver(ps8622_driver); 627330b48bdSThierry Reding 628330b48bdSThierry Reding MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>"); 629330b48bdSThierry Reding MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver"); 630330b48bdSThierry Reding MODULE_LICENSE("GPL v2"); 631