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/consumer.h> 12330b48bdSThierry Reding #include <linux/i2c.h> 13330b48bdSThierry Reding #include <linux/module.h> 14330b48bdSThierry Reding #include <linux/of.h> 15330b48bdSThierry Reding #include <linux/of_device.h> 16330b48bdSThierry Reding #include <linux/pm.h> 17330b48bdSThierry Reding #include <linux/regulator/consumer.h> 1895b60804SSam Ravnborg 19191436c4SMasahiro Yamada #include <drm/drm_atomic_helper.h> 20ee68c743SBoris Brezillon #include <drm/drm_bridge.h> 21191436c4SMasahiro Yamada #include <drm/drm_crtc.h> 22ebc94461SRob Herring #include <drm/drm_of.h> 23330b48bdSThierry Reding #include <drm/drm_panel.h> 2495b60804SSam Ravnborg #include <drm/drm_print.h> 25fcd70cd3SDaniel Vetter #include <drm/drm_probe_helper.h> 26330b48bdSThierry Reding 27330b48bdSThierry Reding /* Brightness scale on the Parade chip */ 28330b48bdSThierry Reding #define PS8622_MAX_BRIGHTNESS 0xff 29330b48bdSThierry Reding 30330b48bdSThierry Reding /* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */ 31330b48bdSThierry Reding #define PS8622_POWER_RISE_T1_MIN_US 10 32330b48bdSThierry Reding #define PS8622_POWER_RISE_T1_MAX_US 10000 33330b48bdSThierry Reding #define PS8622_RST_HIGH_T2_MIN_US 3000 34330b48bdSThierry Reding #define PS8622_RST_HIGH_T2_MAX_US 30000 35330b48bdSThierry Reding #define PS8622_PWMO_END_T12_MS 200 36330b48bdSThierry Reding #define PS8622_POWER_FALL_T16_MAX_US 10000 37330b48bdSThierry Reding #define PS8622_POWER_OFF_T17_MS 500 38330b48bdSThierry Reding 39330b48bdSThierry Reding #if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \ 40330b48bdSThierry Reding (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US)) 41330b48bdSThierry Reding #error "T2.min + T1.max must be less than T2.max + T1.min" 42330b48bdSThierry Reding #endif 43330b48bdSThierry Reding 44330b48bdSThierry Reding struct ps8622_bridge { 45330b48bdSThierry Reding struct drm_connector connector; 46330b48bdSThierry Reding struct i2c_client *client; 47330b48bdSThierry Reding struct drm_bridge bridge; 48330b48bdSThierry Reding struct drm_panel *panel; 49330b48bdSThierry Reding struct regulator *v12; 50330b48bdSThierry Reding struct backlight_device *bl; 51330b48bdSThierry Reding 52330b48bdSThierry Reding struct gpio_desc *gpio_slp; 53330b48bdSThierry Reding struct gpio_desc *gpio_rst; 54330b48bdSThierry Reding 55330b48bdSThierry Reding u32 max_lane_count; 56330b48bdSThierry Reding u32 lane_count; 57330b48bdSThierry Reding 58330b48bdSThierry Reding bool enabled; 59330b48bdSThierry Reding }; 60330b48bdSThierry Reding 61330b48bdSThierry Reding static inline struct ps8622_bridge * 62330b48bdSThierry Reding bridge_to_ps8622(struct drm_bridge *bridge) 63330b48bdSThierry Reding { 64330b48bdSThierry Reding return container_of(bridge, struct ps8622_bridge, bridge); 65330b48bdSThierry Reding } 66330b48bdSThierry Reding 67330b48bdSThierry Reding static inline struct ps8622_bridge * 68330b48bdSThierry Reding connector_to_ps8622(struct drm_connector *connector) 69330b48bdSThierry Reding { 70330b48bdSThierry Reding return container_of(connector, struct ps8622_bridge, connector); 71330b48bdSThierry Reding } 72330b48bdSThierry Reding 73330b48bdSThierry Reding static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val) 74330b48bdSThierry Reding { 75330b48bdSThierry Reding int ret; 76330b48bdSThierry Reding struct i2c_adapter *adap = client->adapter; 77330b48bdSThierry Reding struct i2c_msg msg; 78330b48bdSThierry Reding u8 data[] = {reg, val}; 79330b48bdSThierry Reding 80330b48bdSThierry Reding msg.addr = client->addr + page; 81330b48bdSThierry Reding msg.flags = 0; 82330b48bdSThierry Reding msg.len = sizeof(data); 83330b48bdSThierry Reding msg.buf = data; 84330b48bdSThierry Reding 85330b48bdSThierry Reding ret = i2c_transfer(adap, &msg, 1); 86330b48bdSThierry Reding if (ret != 1) 87330b48bdSThierry Reding pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n", 88330b48bdSThierry Reding client->addr + page, reg, val, ret); 89330b48bdSThierry Reding return !(ret == 1); 90330b48bdSThierry Reding } 91330b48bdSThierry Reding 92330b48bdSThierry Reding static int ps8622_send_config(struct ps8622_bridge *ps8622) 93330b48bdSThierry Reding { 94330b48bdSThierry Reding struct i2c_client *cl = ps8622->client; 95330b48bdSThierry Reding int err = 0; 96330b48bdSThierry Reding 97330b48bdSThierry Reding /* HPD low */ 98330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xa1, 0x01); 99330b48bdSThierry Reding if (err) 100330b48bdSThierry Reding goto error; 101330b48bdSThierry Reding 102330b48bdSThierry Reding /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */ 103330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x14, 0x01); 104330b48bdSThierry Reding if (err) 105330b48bdSThierry Reding goto error; 106330b48bdSThierry Reding 107330b48bdSThierry Reding /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */ 108330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xe3, 0x20); 109330b48bdSThierry Reding if (err) 110330b48bdSThierry Reding goto error; 111330b48bdSThierry Reding 112330b48bdSThierry Reding /* [7] RCO SS enable */ 113330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xe2, 0x80); 114330b48bdSThierry Reding if (err) 115330b48bdSThierry Reding goto error; 116330b48bdSThierry Reding 117330b48bdSThierry Reding /* RPHY Setting 118330b48bdSThierry Reding * [3:2] CDR tune wait cycle before measure for fine tune 119330b48bdSThierry Reding * b00: 1us b01: 0.5us b10:2us, b11: 4us 120330b48bdSThierry Reding */ 121330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x8a, 0x0c); 122330b48bdSThierry Reding if (err) 123330b48bdSThierry Reding goto error; 124330b48bdSThierry Reding 125330b48bdSThierry Reding /* [3] RFD always on */ 126330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x89, 0x08); 127330b48bdSThierry Reding if (err) 128330b48bdSThierry Reding goto error; 129330b48bdSThierry Reding 130330b48bdSThierry Reding /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */ 131330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x71, 0x2d); 132330b48bdSThierry Reding if (err) 133330b48bdSThierry Reding goto error; 134330b48bdSThierry Reding 135330b48bdSThierry Reding /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */ 136330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7d, 0x07); 137330b48bdSThierry Reding if (err) 138330b48bdSThierry Reding goto error; 139330b48bdSThierry Reding 140330b48bdSThierry Reding /* [1:0] Fmin=+4bands */ 141330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7b, 0x00); 142330b48bdSThierry Reding if (err) 143330b48bdSThierry Reding goto error; 144330b48bdSThierry Reding 145330b48bdSThierry Reding /* [7:5] DCO_FTRNG=+-40% */ 146330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7a, 0xfd); 147330b48bdSThierry Reding if (err) 148330b48bdSThierry Reding goto error; 149330b48bdSThierry Reding 150330b48bdSThierry Reding /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */ 151330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc0, 0x12); 152330b48bdSThierry Reding if (err) 153330b48bdSThierry Reding goto error; 154330b48bdSThierry Reding 155330b48bdSThierry Reding /* Gitune=-37% */ 156330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc1, 0x92); 157330b48bdSThierry Reding if (err) 158330b48bdSThierry Reding goto error; 159330b48bdSThierry Reding 160330b48bdSThierry Reding /* Fbstep=100% */ 161330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc2, 0x1c); 162330b48bdSThierry Reding if (err) 163330b48bdSThierry Reding goto error; 164330b48bdSThierry Reding 165330b48bdSThierry Reding /* [7] LOS signal disable */ 166330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x32, 0x80); 167330b48bdSThierry Reding if (err) 168330b48bdSThierry Reding goto error; 169330b48bdSThierry Reding 170330b48bdSThierry Reding /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */ 171330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x00, 0xb0); 172330b48bdSThierry Reding if (err) 173330b48bdSThierry Reding goto error; 174330b48bdSThierry Reding 175330b48bdSThierry Reding /* [7:6] Right-bar GPIO output strength is 8mA */ 176330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x15, 0x40); 177330b48bdSThierry Reding if (err) 178330b48bdSThierry Reding goto error; 179330b48bdSThierry Reding 180330b48bdSThierry Reding /* EQ Training State Machine Setting, RCO calibration start */ 181330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x54, 0x10); 182330b48bdSThierry Reding if (err) 183330b48bdSThierry Reding goto error; 184330b48bdSThierry Reding 185330b48bdSThierry Reding /* Logic, needs more than 10 I2C command */ 186330b48bdSThierry Reding /* [4:0] MAX_LANE_COUNT set to max supported lanes */ 187330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count); 188330b48bdSThierry Reding if (err) 189330b48bdSThierry Reding goto error; 190330b48bdSThierry Reding 191330b48bdSThierry Reding /* [4:0] LANE_COUNT_SET set to chosen lane count */ 192330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count); 193330b48bdSThierry Reding if (err) 194330b48bdSThierry Reding goto error; 195330b48bdSThierry Reding 196330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x52, 0x20); 197330b48bdSThierry Reding if (err) 198330b48bdSThierry Reding goto error; 199330b48bdSThierry Reding 200330b48bdSThierry Reding /* HPD CP toggle enable */ 201330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0xf1, 0x03); 202330b48bdSThierry Reding if (err) 203330b48bdSThierry Reding goto error; 204330b48bdSThierry Reding 205330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x62, 0x41); 206330b48bdSThierry Reding if (err) 207330b48bdSThierry Reding goto error; 208330b48bdSThierry Reding 209330b48bdSThierry Reding /* Counter number, add 1ms counter delay */ 210330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0xf6, 0x01); 211330b48bdSThierry Reding if (err) 212330b48bdSThierry Reding goto error; 213330b48bdSThierry Reding 214330b48bdSThierry Reding /* [6]PWM function control by DPCD0040f[7], default is PWM block */ 215330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x77, 0x06); 216330b48bdSThierry Reding if (err) 217330b48bdSThierry Reding goto error; 218330b48bdSThierry Reding 219330b48bdSThierry Reding /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */ 220330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x4c, 0x04); 221330b48bdSThierry Reding if (err) 222330b48bdSThierry Reding goto error; 223330b48bdSThierry Reding 224330b48bdSThierry Reding /* DPCD00400='h00, Parade OUI ='h001cf8 */ 225330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc0, 0x00); 226330b48bdSThierry Reding if (err) 227330b48bdSThierry Reding goto error; 228330b48bdSThierry Reding 229330b48bdSThierry Reding /* DPCD00401='h1c */ 230330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc1, 0x1c); 231330b48bdSThierry Reding if (err) 232330b48bdSThierry Reding goto error; 233330b48bdSThierry Reding 234330b48bdSThierry Reding /* DPCD00402='hf8 */ 235330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc2, 0xf8); 236330b48bdSThierry Reding if (err) 237330b48bdSThierry Reding goto error; 238330b48bdSThierry Reding 239330b48bdSThierry Reding /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */ 240330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc3, 0x44); 241330b48bdSThierry Reding if (err) 242330b48bdSThierry Reding goto error; 243330b48bdSThierry Reding 244330b48bdSThierry Reding /* DPCD404 */ 245330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc4, 0x32); 246330b48bdSThierry Reding if (err) 247330b48bdSThierry Reding goto error; 248330b48bdSThierry Reding 249330b48bdSThierry Reding /* DPCD405 */ 250330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc5, 0x53); 251330b48bdSThierry Reding if (err) 252330b48bdSThierry Reding goto error; 253330b48bdSThierry Reding 254330b48bdSThierry Reding /* DPCD406 */ 255330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc6, 0x4c); 256330b48bdSThierry Reding if (err) 257330b48bdSThierry Reding goto error; 258330b48bdSThierry Reding 259330b48bdSThierry Reding /* DPCD407 */ 260330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc7, 0x56); 261330b48bdSThierry Reding if (err) 262330b48bdSThierry Reding goto error; 263330b48bdSThierry Reding 264330b48bdSThierry Reding /* DPCD408 */ 265330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc8, 0x35); 266330b48bdSThierry Reding if (err) 267330b48bdSThierry Reding goto error; 268330b48bdSThierry Reding 269330b48bdSThierry Reding /* DPCD40A, Initial Code major revision '01' */ 270330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xca, 0x01); 271330b48bdSThierry Reding if (err) 272330b48bdSThierry Reding goto error; 273330b48bdSThierry Reding 274330b48bdSThierry Reding /* DPCD40B, Initial Code minor revision '05' */ 275330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xcb, 0x05); 276330b48bdSThierry Reding if (err) 277330b48bdSThierry Reding goto error; 278330b48bdSThierry Reding 279330b48bdSThierry Reding 280330b48bdSThierry Reding if (ps8622->bl) { 281330b48bdSThierry Reding /* DPCD720, internal PWM */ 282330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa5, 0xa0); 283330b48bdSThierry Reding if (err) 284330b48bdSThierry Reding goto error; 285330b48bdSThierry Reding 286330b48bdSThierry Reding /* FFh for 100% brightness, 0h for 0% brightness */ 287330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa7, 288330b48bdSThierry Reding ps8622->bl->props.brightness); 289330b48bdSThierry Reding if (err) 290330b48bdSThierry Reding goto error; 291330b48bdSThierry Reding } else { 292330b48bdSThierry Reding /* DPCD720, external PWM */ 293330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa5, 0x80); 294330b48bdSThierry Reding if (err) 295330b48bdSThierry Reding goto error; 296330b48bdSThierry Reding } 297330b48bdSThierry Reding 298330b48bdSThierry Reding /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */ 299330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xcc, 0x13); 300330b48bdSThierry Reding if (err) 301330b48bdSThierry Reding goto error; 302330b48bdSThierry Reding 303330b48bdSThierry Reding /* Enable SSC set by register */ 304330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xb1, 0x20); 305330b48bdSThierry Reding if (err) 306330b48bdSThierry Reding goto error; 307330b48bdSThierry Reding 308330b48bdSThierry Reding /* Set SSC enabled and +/-1% central spreading */ 309330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x10, 0x16); 310330b48bdSThierry Reding if (err) 311330b48bdSThierry Reding goto error; 312330b48bdSThierry Reding 313330b48bdSThierry Reding /* Logic end */ 314330b48bdSThierry Reding /* MPU Clock source: LC => RCO */ 315330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x59, 0x60); 316330b48bdSThierry Reding if (err) 317330b48bdSThierry Reding goto error; 318330b48bdSThierry Reding 319330b48bdSThierry Reding /* LC -> RCO */ 320330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x54, 0x14); 321330b48bdSThierry Reding if (err) 322330b48bdSThierry Reding goto error; 323330b48bdSThierry Reding 324330b48bdSThierry Reding /* HPD high */ 325330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xa1, 0x91); 326330b48bdSThierry Reding 327330b48bdSThierry Reding error: 328330b48bdSThierry Reding return err ? -EIO : 0; 329330b48bdSThierry Reding } 330330b48bdSThierry Reding 331330b48bdSThierry Reding static int ps8622_backlight_update(struct backlight_device *bl) 332330b48bdSThierry Reding { 333330b48bdSThierry Reding struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev); 334330b48bdSThierry Reding int ret, brightness = bl->props.brightness; 335330b48bdSThierry Reding 336330b48bdSThierry Reding if (bl->props.power != FB_BLANK_UNBLANK || 337330b48bdSThierry Reding bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) 338330b48bdSThierry Reding brightness = 0; 339330b48bdSThierry Reding 340330b48bdSThierry Reding if (!ps8622->enabled) 341330b48bdSThierry Reding return -EINVAL; 342330b48bdSThierry Reding 343330b48bdSThierry Reding ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness); 344330b48bdSThierry Reding 345330b48bdSThierry Reding return ret; 346330b48bdSThierry Reding } 347330b48bdSThierry Reding 348330b48bdSThierry Reding static const struct backlight_ops ps8622_backlight_ops = { 349330b48bdSThierry Reding .update_status = ps8622_backlight_update, 350330b48bdSThierry Reding }; 351330b48bdSThierry Reding 352330b48bdSThierry Reding static void ps8622_pre_enable(struct drm_bridge *bridge) 353330b48bdSThierry Reding { 354330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 355330b48bdSThierry Reding int ret; 356330b48bdSThierry Reding 357330b48bdSThierry Reding if (ps8622->enabled) 358330b48bdSThierry Reding return; 359330b48bdSThierry Reding 360330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 0); 361330b48bdSThierry Reding 362330b48bdSThierry Reding if (ps8622->v12) { 363330b48bdSThierry Reding ret = regulator_enable(ps8622->v12); 364330b48bdSThierry Reding if (ret) 365330b48bdSThierry Reding DRM_ERROR("fails to enable ps8622->v12"); 366330b48bdSThierry Reding } 367330b48bdSThierry Reding 368330b48bdSThierry Reding if (drm_panel_prepare(ps8622->panel)) { 369330b48bdSThierry Reding DRM_ERROR("failed to prepare panel\n"); 370330b48bdSThierry Reding return; 371330b48bdSThierry Reding } 372330b48bdSThierry Reding 373330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_slp, 1); 374330b48bdSThierry Reding 375330b48bdSThierry Reding /* 376330b48bdSThierry Reding * T1 is the range of time that it takes for the power to rise after we 377330b48bdSThierry Reding * enable the lcd/ps8622 fet. T2 is the range of time in which the 378330b48bdSThierry Reding * data sheet specifies we should deassert the reset pin. 379330b48bdSThierry Reding * 380330b48bdSThierry Reding * If it takes T1.max for the power to rise, we need to wait atleast 381330b48bdSThierry Reding * T2.min before deasserting the reset pin. If it takes T1.min for the 382330b48bdSThierry Reding * power to rise, we need to wait at most T2.max before deasserting the 383330b48bdSThierry Reding * reset pin. 384330b48bdSThierry Reding */ 385330b48bdSThierry Reding usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US, 386330b48bdSThierry Reding PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US); 387330b48bdSThierry Reding 388330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 1); 389330b48bdSThierry Reding 390330b48bdSThierry Reding /* wait 20ms after RST high */ 391330b48bdSThierry Reding usleep_range(20000, 30000); 392330b48bdSThierry Reding 393330b48bdSThierry Reding ret = ps8622_send_config(ps8622); 394330b48bdSThierry Reding if (ret) { 395330b48bdSThierry Reding DRM_ERROR("Failed to send config to bridge (%d)\n", ret); 396330b48bdSThierry Reding return; 397330b48bdSThierry Reding } 398330b48bdSThierry Reding 399330b48bdSThierry Reding ps8622->enabled = true; 400330b48bdSThierry Reding } 401330b48bdSThierry Reding 402330b48bdSThierry Reding static void ps8622_enable(struct drm_bridge *bridge) 403330b48bdSThierry Reding { 404330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 405330b48bdSThierry Reding 406330b48bdSThierry Reding if (drm_panel_enable(ps8622->panel)) { 407330b48bdSThierry Reding DRM_ERROR("failed to enable panel\n"); 408330b48bdSThierry Reding return; 409330b48bdSThierry Reding } 410330b48bdSThierry Reding } 411330b48bdSThierry Reding 412330b48bdSThierry Reding static void ps8622_disable(struct drm_bridge *bridge) 413330b48bdSThierry Reding { 414330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 415330b48bdSThierry Reding 416330b48bdSThierry Reding if (drm_panel_disable(ps8622->panel)) { 417330b48bdSThierry Reding DRM_ERROR("failed to disable panel\n"); 418330b48bdSThierry Reding return; 419330b48bdSThierry Reding } 420330b48bdSThierry Reding msleep(PS8622_PWMO_END_T12_MS); 421330b48bdSThierry Reding } 422330b48bdSThierry Reding 423330b48bdSThierry Reding static void ps8622_post_disable(struct drm_bridge *bridge) 424330b48bdSThierry Reding { 425330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 426330b48bdSThierry Reding 427330b48bdSThierry Reding if (!ps8622->enabled) 428330b48bdSThierry Reding return; 429330b48bdSThierry Reding 430330b48bdSThierry Reding ps8622->enabled = false; 431330b48bdSThierry Reding 432330b48bdSThierry Reding /* 433330b48bdSThierry Reding * This doesn't matter if the regulators are turned off, but something 434330b48bdSThierry Reding * else might keep them on. In that case, we want to assert the slp gpio 435330b48bdSThierry Reding * to lower power. 436330b48bdSThierry Reding */ 437330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_slp, 0); 438330b48bdSThierry Reding 439330b48bdSThierry Reding if (drm_panel_unprepare(ps8622->panel)) { 440330b48bdSThierry Reding DRM_ERROR("failed to unprepare panel\n"); 441330b48bdSThierry Reding return; 442330b48bdSThierry Reding } 443330b48bdSThierry Reding 444330b48bdSThierry Reding if (ps8622->v12) 445330b48bdSThierry Reding regulator_disable(ps8622->v12); 446330b48bdSThierry Reding 447330b48bdSThierry Reding /* 448330b48bdSThierry Reding * Sleep for at least the amount of time that it takes the power rail to 449330b48bdSThierry Reding * fall to prevent asserting the rst gpio from doing anything. 450330b48bdSThierry Reding */ 451330b48bdSThierry Reding usleep_range(PS8622_POWER_FALL_T16_MAX_US, 452330b48bdSThierry Reding 2 * PS8622_POWER_FALL_T16_MAX_US); 453330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 0); 454330b48bdSThierry Reding 455330b48bdSThierry Reding msleep(PS8622_POWER_OFF_T17_MS); 456330b48bdSThierry Reding } 457330b48bdSThierry Reding 458330b48bdSThierry Reding static int ps8622_get_modes(struct drm_connector *connector) 459330b48bdSThierry Reding { 460330b48bdSThierry Reding struct ps8622_bridge *ps8622; 461330b48bdSThierry Reding 462330b48bdSThierry Reding ps8622 = connector_to_ps8622(connector); 463330b48bdSThierry Reding 46406c4a9c2SSam Ravnborg return drm_panel_get_modes(ps8622->panel, connector); 465330b48bdSThierry Reding } 466330b48bdSThierry Reding 467330b48bdSThierry Reding static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = { 468330b48bdSThierry Reding .get_modes = ps8622_get_modes, 469330b48bdSThierry Reding }; 470330b48bdSThierry Reding 471330b48bdSThierry Reding static const struct drm_connector_funcs ps8622_connector_funcs = { 472330b48bdSThierry Reding .fill_modes = drm_helper_probe_single_connector_modes, 473bf3b123eSMarek Vasut .destroy = drm_connector_cleanup, 474330b48bdSThierry Reding .reset = drm_atomic_helper_connector_reset, 475330b48bdSThierry Reding .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 476330b48bdSThierry Reding .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 477330b48bdSThierry Reding }; 478330b48bdSThierry Reding 479a25b988fSLaurent Pinchart static int ps8622_attach(struct drm_bridge *bridge, 480a25b988fSLaurent Pinchart enum drm_bridge_attach_flags flags) 481330b48bdSThierry Reding { 482330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 483330b48bdSThierry Reding int ret; 484330b48bdSThierry Reding 485a25b988fSLaurent Pinchart if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) { 486a25b988fSLaurent Pinchart DRM_ERROR("Fix bridge driver to make connector optional!"); 487a25b988fSLaurent Pinchart return -EINVAL; 488a25b988fSLaurent Pinchart } 489a25b988fSLaurent Pinchart 490330b48bdSThierry Reding if (!bridge->encoder) { 491330b48bdSThierry Reding DRM_ERROR("Parent encoder object not found"); 492330b48bdSThierry Reding return -ENODEV; 493330b48bdSThierry Reding } 494330b48bdSThierry Reding 495330b48bdSThierry Reding ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD; 496330b48bdSThierry Reding ret = drm_connector_init(bridge->dev, &ps8622->connector, 497330b48bdSThierry Reding &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS); 498330b48bdSThierry Reding if (ret) { 499330b48bdSThierry Reding DRM_ERROR("Failed to initialize connector with drm\n"); 500330b48bdSThierry Reding return ret; 501330b48bdSThierry Reding } 502330b48bdSThierry Reding drm_connector_helper_add(&ps8622->connector, 503330b48bdSThierry Reding &ps8622_connector_helper_funcs); 504330b48bdSThierry Reding drm_connector_register(&ps8622->connector); 505cde4c44dSDaniel Vetter drm_connector_attach_encoder(&ps8622->connector, 506330b48bdSThierry Reding bridge->encoder); 507330b48bdSThierry Reding 508330b48bdSThierry Reding if (ps8622->panel) 509330b48bdSThierry Reding drm_panel_attach(ps8622->panel, &ps8622->connector); 510330b48bdSThierry Reding 511330b48bdSThierry Reding drm_helper_hpd_irq_event(ps8622->connector.dev); 512330b48bdSThierry Reding 513330b48bdSThierry Reding return ret; 514330b48bdSThierry Reding } 515330b48bdSThierry Reding 516330b48bdSThierry Reding static const struct drm_bridge_funcs ps8622_bridge_funcs = { 517330b48bdSThierry Reding .pre_enable = ps8622_pre_enable, 518330b48bdSThierry Reding .enable = ps8622_enable, 519330b48bdSThierry Reding .disable = ps8622_disable, 520330b48bdSThierry Reding .post_disable = ps8622_post_disable, 521330b48bdSThierry Reding .attach = ps8622_attach, 522330b48bdSThierry Reding }; 523330b48bdSThierry Reding 524330b48bdSThierry Reding static const struct of_device_id ps8622_devices[] = { 525330b48bdSThierry Reding {.compatible = "parade,ps8622",}, 526330b48bdSThierry Reding {.compatible = "parade,ps8625",}, 527330b48bdSThierry Reding {} 528330b48bdSThierry Reding }; 529330b48bdSThierry Reding MODULE_DEVICE_TABLE(of, ps8622_devices); 530330b48bdSThierry Reding 531330b48bdSThierry Reding static int ps8622_probe(struct i2c_client *client, 532330b48bdSThierry Reding const struct i2c_device_id *id) 533330b48bdSThierry Reding { 534330b48bdSThierry Reding struct device *dev = &client->dev; 535330b48bdSThierry Reding struct ps8622_bridge *ps8622; 536330b48bdSThierry Reding int ret; 537330b48bdSThierry Reding 538330b48bdSThierry Reding ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL); 539330b48bdSThierry Reding if (!ps8622) 540330b48bdSThierry Reding return -ENOMEM; 541330b48bdSThierry Reding 542ebc94461SRob Herring ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL); 543ebc94461SRob Herring if (ret) 544ebc94461SRob Herring return ret; 545330b48bdSThierry Reding 546330b48bdSThierry Reding ps8622->client = client; 547330b48bdSThierry Reding 548330b48bdSThierry Reding ps8622->v12 = devm_regulator_get(dev, "vdd12"); 549330b48bdSThierry Reding if (IS_ERR(ps8622->v12)) { 550330b48bdSThierry Reding dev_info(dev, "no 1.2v regulator found for PS8622\n"); 551330b48bdSThierry Reding ps8622->v12 = NULL; 552330b48bdSThierry Reding } 553330b48bdSThierry Reding 554330b48bdSThierry Reding ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH); 555330b48bdSThierry Reding if (IS_ERR(ps8622->gpio_slp)) { 556330b48bdSThierry Reding ret = PTR_ERR(ps8622->gpio_slp); 557330b48bdSThierry Reding dev_err(dev, "cannot get gpio_slp %d\n", ret); 558330b48bdSThierry Reding return ret; 559330b48bdSThierry Reding } 560330b48bdSThierry Reding 561330b48bdSThierry Reding /* 562330b48bdSThierry Reding * Assert the reset pin high to avoid the bridge being 563330b48bdSThierry Reding * initialized prematurely 564330b48bdSThierry Reding */ 565330b48bdSThierry Reding ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); 566330b48bdSThierry Reding if (IS_ERR(ps8622->gpio_rst)) { 567330b48bdSThierry Reding ret = PTR_ERR(ps8622->gpio_rst); 568330b48bdSThierry Reding dev_err(dev, "cannot get gpio_rst %d\n", ret); 569330b48bdSThierry Reding return ret; 570330b48bdSThierry Reding } 571330b48bdSThierry Reding 572330b48bdSThierry Reding ps8622->max_lane_count = id->driver_data; 573330b48bdSThierry Reding 574330b48bdSThierry Reding if (of_property_read_u32(dev->of_node, "lane-count", 575330b48bdSThierry Reding &ps8622->lane_count)) { 576330b48bdSThierry Reding ps8622->lane_count = ps8622->max_lane_count; 577330b48bdSThierry Reding } else if (ps8622->lane_count > ps8622->max_lane_count) { 578330b48bdSThierry Reding dev_info(dev, "lane-count property is too high," 579330b48bdSThierry Reding "using max_lane_count\n"); 580330b48bdSThierry Reding ps8622->lane_count = ps8622->max_lane_count; 581330b48bdSThierry Reding } 582330b48bdSThierry Reding 583330b48bdSThierry Reding if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) { 584330b48bdSThierry Reding ps8622->bl = backlight_device_register("ps8622-backlight", 585330b48bdSThierry Reding dev, ps8622, &ps8622_backlight_ops, 586330b48bdSThierry Reding NULL); 587330b48bdSThierry Reding if (IS_ERR(ps8622->bl)) { 588330b48bdSThierry Reding DRM_ERROR("failed to register backlight\n"); 589330b48bdSThierry Reding ret = PTR_ERR(ps8622->bl); 590330b48bdSThierry Reding ps8622->bl = NULL; 591330b48bdSThierry Reding return ret; 592330b48bdSThierry Reding } 593330b48bdSThierry Reding ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS; 594330b48bdSThierry Reding ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS; 595330b48bdSThierry Reding } 596330b48bdSThierry Reding 597330b48bdSThierry Reding ps8622->bridge.funcs = &ps8622_bridge_funcs; 598330b48bdSThierry Reding ps8622->bridge.of_node = dev->of_node; 599d0ceb3ecSInki Dae drm_bridge_add(&ps8622->bridge); 600330b48bdSThierry Reding 601330b48bdSThierry Reding i2c_set_clientdata(client, ps8622); 602330b48bdSThierry Reding 603330b48bdSThierry Reding return 0; 604330b48bdSThierry Reding } 605330b48bdSThierry Reding 606330b48bdSThierry Reding static int ps8622_remove(struct i2c_client *client) 607330b48bdSThierry Reding { 608330b48bdSThierry Reding struct ps8622_bridge *ps8622 = i2c_get_clientdata(client); 609330b48bdSThierry Reding 610330b48bdSThierry Reding backlight_device_unregister(ps8622->bl); 611330b48bdSThierry Reding drm_bridge_remove(&ps8622->bridge); 612330b48bdSThierry Reding 613330b48bdSThierry Reding return 0; 614330b48bdSThierry Reding } 615330b48bdSThierry Reding 616330b48bdSThierry Reding static const struct i2c_device_id ps8622_i2c_table[] = { 617330b48bdSThierry Reding /* Device type, max_lane_count */ 618330b48bdSThierry Reding {"ps8622", 1}, 619330b48bdSThierry Reding {"ps8625", 2}, 620330b48bdSThierry Reding {}, 621330b48bdSThierry Reding }; 622330b48bdSThierry Reding MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table); 623330b48bdSThierry Reding 624330b48bdSThierry Reding static struct i2c_driver ps8622_driver = { 625330b48bdSThierry Reding .id_table = ps8622_i2c_table, 626330b48bdSThierry Reding .probe = ps8622_probe, 627330b48bdSThierry Reding .remove = ps8622_remove, 628330b48bdSThierry Reding .driver = { 629330b48bdSThierry Reding .name = "ps8622", 630330b48bdSThierry Reding .of_match_table = ps8622_devices, 631330b48bdSThierry Reding }, 632330b48bdSThierry Reding }; 633330b48bdSThierry Reding module_i2c_driver(ps8622_driver); 634330b48bdSThierry Reding 635330b48bdSThierry Reding MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>"); 636330b48bdSThierry Reding MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver"); 637330b48bdSThierry Reding MODULE_LICENSE("GPL v2"); 638