1330b48bdSThierry Reding /* 2330b48bdSThierry Reding * Parade PS8622 eDP/LVDS bridge driver 3330b48bdSThierry Reding * 4330b48bdSThierry Reding * Copyright (C) 2014 Google, Inc. 5330b48bdSThierry Reding * 6330b48bdSThierry Reding * This software is licensed under the terms of the GNU General Public 7330b48bdSThierry Reding * License version 2, as published by the Free Software Foundation, and 8330b48bdSThierry Reding * may be copied, distributed, and modified under those terms. 9330b48bdSThierry Reding * 10330b48bdSThierry Reding * This program is distributed in the hope that it will be useful, 11330b48bdSThierry Reding * but WITHOUT ANY WARRANTY; without even the implied warranty of 12330b48bdSThierry Reding * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13330b48bdSThierry Reding * GNU General Public License for more details. 14330b48bdSThierry Reding */ 15330b48bdSThierry Reding 16330b48bdSThierry Reding #include <linux/backlight.h> 17330b48bdSThierry Reding #include <linux/delay.h> 18330b48bdSThierry Reding #include <linux/err.h> 19330b48bdSThierry Reding #include <linux/gpio.h> 20330b48bdSThierry Reding #include <linux/gpio/consumer.h> 21330b48bdSThierry Reding #include <linux/i2c.h> 22330b48bdSThierry Reding #include <linux/module.h> 23330b48bdSThierry Reding #include <linux/of.h> 24330b48bdSThierry Reding #include <linux/of_device.h> 25330b48bdSThierry Reding #include <linux/pm.h> 26330b48bdSThierry Reding #include <linux/regulator/consumer.h> 2795b60804SSam Ravnborg 28191436c4SMasahiro Yamada #include <drm/drm_atomic_helper.h> 29191436c4SMasahiro Yamada #include <drm/drm_crtc.h> 30ebc94461SRob Herring #include <drm/drm_of.h> 31330b48bdSThierry Reding #include <drm/drm_panel.h> 3295b60804SSam Ravnborg #include <drm/drm_print.h> 33fcd70cd3SDaniel Vetter #include <drm/drm_probe_helper.h> 34330b48bdSThierry Reding 35330b48bdSThierry Reding /* Brightness scale on the Parade chip */ 36330b48bdSThierry Reding #define PS8622_MAX_BRIGHTNESS 0xff 37330b48bdSThierry Reding 38330b48bdSThierry Reding /* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */ 39330b48bdSThierry Reding #define PS8622_POWER_RISE_T1_MIN_US 10 40330b48bdSThierry Reding #define PS8622_POWER_RISE_T1_MAX_US 10000 41330b48bdSThierry Reding #define PS8622_RST_HIGH_T2_MIN_US 3000 42330b48bdSThierry Reding #define PS8622_RST_HIGH_T2_MAX_US 30000 43330b48bdSThierry Reding #define PS8622_PWMO_END_T12_MS 200 44330b48bdSThierry Reding #define PS8622_POWER_FALL_T16_MAX_US 10000 45330b48bdSThierry Reding #define PS8622_POWER_OFF_T17_MS 500 46330b48bdSThierry Reding 47330b48bdSThierry Reding #if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \ 48330b48bdSThierry Reding (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US)) 49330b48bdSThierry Reding #error "T2.min + T1.max must be less than T2.max + T1.min" 50330b48bdSThierry Reding #endif 51330b48bdSThierry Reding 52330b48bdSThierry Reding struct ps8622_bridge { 53330b48bdSThierry Reding struct drm_connector connector; 54330b48bdSThierry Reding struct i2c_client *client; 55330b48bdSThierry Reding struct drm_bridge bridge; 56330b48bdSThierry Reding struct drm_panel *panel; 57330b48bdSThierry Reding struct regulator *v12; 58330b48bdSThierry Reding struct backlight_device *bl; 59330b48bdSThierry Reding 60330b48bdSThierry Reding struct gpio_desc *gpio_slp; 61330b48bdSThierry Reding struct gpio_desc *gpio_rst; 62330b48bdSThierry Reding 63330b48bdSThierry Reding u32 max_lane_count; 64330b48bdSThierry Reding u32 lane_count; 65330b48bdSThierry Reding 66330b48bdSThierry Reding bool enabled; 67330b48bdSThierry Reding }; 68330b48bdSThierry Reding 69330b48bdSThierry Reding static inline struct ps8622_bridge * 70330b48bdSThierry Reding bridge_to_ps8622(struct drm_bridge *bridge) 71330b48bdSThierry Reding { 72330b48bdSThierry Reding return container_of(bridge, struct ps8622_bridge, bridge); 73330b48bdSThierry Reding } 74330b48bdSThierry Reding 75330b48bdSThierry Reding static inline struct ps8622_bridge * 76330b48bdSThierry Reding connector_to_ps8622(struct drm_connector *connector) 77330b48bdSThierry Reding { 78330b48bdSThierry Reding return container_of(connector, struct ps8622_bridge, connector); 79330b48bdSThierry Reding } 80330b48bdSThierry Reding 81330b48bdSThierry Reding static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val) 82330b48bdSThierry Reding { 83330b48bdSThierry Reding int ret; 84330b48bdSThierry Reding struct i2c_adapter *adap = client->adapter; 85330b48bdSThierry Reding struct i2c_msg msg; 86330b48bdSThierry Reding u8 data[] = {reg, val}; 87330b48bdSThierry Reding 88330b48bdSThierry Reding msg.addr = client->addr + page; 89330b48bdSThierry Reding msg.flags = 0; 90330b48bdSThierry Reding msg.len = sizeof(data); 91330b48bdSThierry Reding msg.buf = data; 92330b48bdSThierry Reding 93330b48bdSThierry Reding ret = i2c_transfer(adap, &msg, 1); 94330b48bdSThierry Reding if (ret != 1) 95330b48bdSThierry Reding pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n", 96330b48bdSThierry Reding client->addr + page, reg, val, ret); 97330b48bdSThierry Reding return !(ret == 1); 98330b48bdSThierry Reding } 99330b48bdSThierry Reding 100330b48bdSThierry Reding static int ps8622_send_config(struct ps8622_bridge *ps8622) 101330b48bdSThierry Reding { 102330b48bdSThierry Reding struct i2c_client *cl = ps8622->client; 103330b48bdSThierry Reding int err = 0; 104330b48bdSThierry Reding 105330b48bdSThierry Reding /* HPD low */ 106330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xa1, 0x01); 107330b48bdSThierry Reding if (err) 108330b48bdSThierry Reding goto error; 109330b48bdSThierry Reding 110330b48bdSThierry Reding /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */ 111330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x14, 0x01); 112330b48bdSThierry Reding if (err) 113330b48bdSThierry Reding goto error; 114330b48bdSThierry Reding 115330b48bdSThierry Reding /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */ 116330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xe3, 0x20); 117330b48bdSThierry Reding if (err) 118330b48bdSThierry Reding goto error; 119330b48bdSThierry Reding 120330b48bdSThierry Reding /* [7] RCO SS enable */ 121330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xe2, 0x80); 122330b48bdSThierry Reding if (err) 123330b48bdSThierry Reding goto error; 124330b48bdSThierry Reding 125330b48bdSThierry Reding /* RPHY Setting 126330b48bdSThierry Reding * [3:2] CDR tune wait cycle before measure for fine tune 127330b48bdSThierry Reding * b00: 1us b01: 0.5us b10:2us, b11: 4us 128330b48bdSThierry Reding */ 129330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x8a, 0x0c); 130330b48bdSThierry Reding if (err) 131330b48bdSThierry Reding goto error; 132330b48bdSThierry Reding 133330b48bdSThierry Reding /* [3] RFD always on */ 134330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x89, 0x08); 135330b48bdSThierry Reding if (err) 136330b48bdSThierry Reding goto error; 137330b48bdSThierry Reding 138330b48bdSThierry Reding /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */ 139330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x71, 0x2d); 140330b48bdSThierry Reding if (err) 141330b48bdSThierry Reding goto error; 142330b48bdSThierry Reding 143330b48bdSThierry Reding /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */ 144330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7d, 0x07); 145330b48bdSThierry Reding if (err) 146330b48bdSThierry Reding goto error; 147330b48bdSThierry Reding 148330b48bdSThierry Reding /* [1:0] Fmin=+4bands */ 149330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7b, 0x00); 150330b48bdSThierry Reding if (err) 151330b48bdSThierry Reding goto error; 152330b48bdSThierry Reding 153330b48bdSThierry Reding /* [7:5] DCO_FTRNG=+-40% */ 154330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7a, 0xfd); 155330b48bdSThierry Reding if (err) 156330b48bdSThierry Reding goto error; 157330b48bdSThierry Reding 158330b48bdSThierry Reding /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */ 159330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc0, 0x12); 160330b48bdSThierry Reding if (err) 161330b48bdSThierry Reding goto error; 162330b48bdSThierry Reding 163330b48bdSThierry Reding /* Gitune=-37% */ 164330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc1, 0x92); 165330b48bdSThierry Reding if (err) 166330b48bdSThierry Reding goto error; 167330b48bdSThierry Reding 168330b48bdSThierry Reding /* Fbstep=100% */ 169330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc2, 0x1c); 170330b48bdSThierry Reding if (err) 171330b48bdSThierry Reding goto error; 172330b48bdSThierry Reding 173330b48bdSThierry Reding /* [7] LOS signal disable */ 174330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x32, 0x80); 175330b48bdSThierry Reding if (err) 176330b48bdSThierry Reding goto error; 177330b48bdSThierry Reding 178330b48bdSThierry Reding /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */ 179330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x00, 0xb0); 180330b48bdSThierry Reding if (err) 181330b48bdSThierry Reding goto error; 182330b48bdSThierry Reding 183330b48bdSThierry Reding /* [7:6] Right-bar GPIO output strength is 8mA */ 184330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x15, 0x40); 185330b48bdSThierry Reding if (err) 186330b48bdSThierry Reding goto error; 187330b48bdSThierry Reding 188330b48bdSThierry Reding /* EQ Training State Machine Setting, RCO calibration start */ 189330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x54, 0x10); 190330b48bdSThierry Reding if (err) 191330b48bdSThierry Reding goto error; 192330b48bdSThierry Reding 193330b48bdSThierry Reding /* Logic, needs more than 10 I2C command */ 194330b48bdSThierry Reding /* [4:0] MAX_LANE_COUNT set to max supported lanes */ 195330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count); 196330b48bdSThierry Reding if (err) 197330b48bdSThierry Reding goto error; 198330b48bdSThierry Reding 199330b48bdSThierry Reding /* [4:0] LANE_COUNT_SET set to chosen lane count */ 200330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count); 201330b48bdSThierry Reding if (err) 202330b48bdSThierry Reding goto error; 203330b48bdSThierry Reding 204330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x52, 0x20); 205330b48bdSThierry Reding if (err) 206330b48bdSThierry Reding goto error; 207330b48bdSThierry Reding 208330b48bdSThierry Reding /* HPD CP toggle enable */ 209330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0xf1, 0x03); 210330b48bdSThierry Reding if (err) 211330b48bdSThierry Reding goto error; 212330b48bdSThierry Reding 213330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x62, 0x41); 214330b48bdSThierry Reding if (err) 215330b48bdSThierry Reding goto error; 216330b48bdSThierry Reding 217330b48bdSThierry Reding /* Counter number, add 1ms counter delay */ 218330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0xf6, 0x01); 219330b48bdSThierry Reding if (err) 220330b48bdSThierry Reding goto error; 221330b48bdSThierry Reding 222330b48bdSThierry Reding /* [6]PWM function control by DPCD0040f[7], default is PWM block */ 223330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x77, 0x06); 224330b48bdSThierry Reding if (err) 225330b48bdSThierry Reding goto error; 226330b48bdSThierry Reding 227330b48bdSThierry Reding /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */ 228330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x4c, 0x04); 229330b48bdSThierry Reding if (err) 230330b48bdSThierry Reding goto error; 231330b48bdSThierry Reding 232330b48bdSThierry Reding /* DPCD00400='h00, Parade OUI ='h001cf8 */ 233330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc0, 0x00); 234330b48bdSThierry Reding if (err) 235330b48bdSThierry Reding goto error; 236330b48bdSThierry Reding 237330b48bdSThierry Reding /* DPCD00401='h1c */ 238330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc1, 0x1c); 239330b48bdSThierry Reding if (err) 240330b48bdSThierry Reding goto error; 241330b48bdSThierry Reding 242330b48bdSThierry Reding /* DPCD00402='hf8 */ 243330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc2, 0xf8); 244330b48bdSThierry Reding if (err) 245330b48bdSThierry Reding goto error; 246330b48bdSThierry Reding 247330b48bdSThierry Reding /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */ 248330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc3, 0x44); 249330b48bdSThierry Reding if (err) 250330b48bdSThierry Reding goto error; 251330b48bdSThierry Reding 252330b48bdSThierry Reding /* DPCD404 */ 253330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc4, 0x32); 254330b48bdSThierry Reding if (err) 255330b48bdSThierry Reding goto error; 256330b48bdSThierry Reding 257330b48bdSThierry Reding /* DPCD405 */ 258330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc5, 0x53); 259330b48bdSThierry Reding if (err) 260330b48bdSThierry Reding goto error; 261330b48bdSThierry Reding 262330b48bdSThierry Reding /* DPCD406 */ 263330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc6, 0x4c); 264330b48bdSThierry Reding if (err) 265330b48bdSThierry Reding goto error; 266330b48bdSThierry Reding 267330b48bdSThierry Reding /* DPCD407 */ 268330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc7, 0x56); 269330b48bdSThierry Reding if (err) 270330b48bdSThierry Reding goto error; 271330b48bdSThierry Reding 272330b48bdSThierry Reding /* DPCD408 */ 273330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc8, 0x35); 274330b48bdSThierry Reding if (err) 275330b48bdSThierry Reding goto error; 276330b48bdSThierry Reding 277330b48bdSThierry Reding /* DPCD40A, Initial Code major revision '01' */ 278330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xca, 0x01); 279330b48bdSThierry Reding if (err) 280330b48bdSThierry Reding goto error; 281330b48bdSThierry Reding 282330b48bdSThierry Reding /* DPCD40B, Initial Code minor revision '05' */ 283330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xcb, 0x05); 284330b48bdSThierry Reding if (err) 285330b48bdSThierry Reding goto error; 286330b48bdSThierry Reding 287330b48bdSThierry Reding 288330b48bdSThierry Reding if (ps8622->bl) { 289330b48bdSThierry Reding /* DPCD720, internal PWM */ 290330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa5, 0xa0); 291330b48bdSThierry Reding if (err) 292330b48bdSThierry Reding goto error; 293330b48bdSThierry Reding 294330b48bdSThierry Reding /* FFh for 100% brightness, 0h for 0% brightness */ 295330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa7, 296330b48bdSThierry Reding ps8622->bl->props.brightness); 297330b48bdSThierry Reding if (err) 298330b48bdSThierry Reding goto error; 299330b48bdSThierry Reding } else { 300330b48bdSThierry Reding /* DPCD720, external PWM */ 301330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa5, 0x80); 302330b48bdSThierry Reding if (err) 303330b48bdSThierry Reding goto error; 304330b48bdSThierry Reding } 305330b48bdSThierry Reding 306330b48bdSThierry Reding /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */ 307330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xcc, 0x13); 308330b48bdSThierry Reding if (err) 309330b48bdSThierry Reding goto error; 310330b48bdSThierry Reding 311330b48bdSThierry Reding /* Enable SSC set by register */ 312330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xb1, 0x20); 313330b48bdSThierry Reding if (err) 314330b48bdSThierry Reding goto error; 315330b48bdSThierry Reding 316330b48bdSThierry Reding /* Set SSC enabled and +/-1% central spreading */ 317330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x10, 0x16); 318330b48bdSThierry Reding if (err) 319330b48bdSThierry Reding goto error; 320330b48bdSThierry Reding 321330b48bdSThierry Reding /* Logic end */ 322330b48bdSThierry Reding /* MPU Clock source: LC => RCO */ 323330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x59, 0x60); 324330b48bdSThierry Reding if (err) 325330b48bdSThierry Reding goto error; 326330b48bdSThierry Reding 327330b48bdSThierry Reding /* LC -> RCO */ 328330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x54, 0x14); 329330b48bdSThierry Reding if (err) 330330b48bdSThierry Reding goto error; 331330b48bdSThierry Reding 332330b48bdSThierry Reding /* HPD high */ 333330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xa1, 0x91); 334330b48bdSThierry Reding 335330b48bdSThierry Reding error: 336330b48bdSThierry Reding return err ? -EIO : 0; 337330b48bdSThierry Reding } 338330b48bdSThierry Reding 339330b48bdSThierry Reding static int ps8622_backlight_update(struct backlight_device *bl) 340330b48bdSThierry Reding { 341330b48bdSThierry Reding struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev); 342330b48bdSThierry Reding int ret, brightness = bl->props.brightness; 343330b48bdSThierry Reding 344330b48bdSThierry Reding if (bl->props.power != FB_BLANK_UNBLANK || 345330b48bdSThierry Reding bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) 346330b48bdSThierry Reding brightness = 0; 347330b48bdSThierry Reding 348330b48bdSThierry Reding if (!ps8622->enabled) 349330b48bdSThierry Reding return -EINVAL; 350330b48bdSThierry Reding 351330b48bdSThierry Reding ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness); 352330b48bdSThierry Reding 353330b48bdSThierry Reding return ret; 354330b48bdSThierry Reding } 355330b48bdSThierry Reding 356330b48bdSThierry Reding static const struct backlight_ops ps8622_backlight_ops = { 357330b48bdSThierry Reding .update_status = ps8622_backlight_update, 358330b48bdSThierry Reding }; 359330b48bdSThierry Reding 360330b48bdSThierry Reding static void ps8622_pre_enable(struct drm_bridge *bridge) 361330b48bdSThierry Reding { 362330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 363330b48bdSThierry Reding int ret; 364330b48bdSThierry Reding 365330b48bdSThierry Reding if (ps8622->enabled) 366330b48bdSThierry Reding return; 367330b48bdSThierry Reding 368330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 0); 369330b48bdSThierry Reding 370330b48bdSThierry Reding if (ps8622->v12) { 371330b48bdSThierry Reding ret = regulator_enable(ps8622->v12); 372330b48bdSThierry Reding if (ret) 373330b48bdSThierry Reding DRM_ERROR("fails to enable ps8622->v12"); 374330b48bdSThierry Reding } 375330b48bdSThierry Reding 376330b48bdSThierry Reding if (drm_panel_prepare(ps8622->panel)) { 377330b48bdSThierry Reding DRM_ERROR("failed to prepare panel\n"); 378330b48bdSThierry Reding return; 379330b48bdSThierry Reding } 380330b48bdSThierry Reding 381330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_slp, 1); 382330b48bdSThierry Reding 383330b48bdSThierry Reding /* 384330b48bdSThierry Reding * T1 is the range of time that it takes for the power to rise after we 385330b48bdSThierry Reding * enable the lcd/ps8622 fet. T2 is the range of time in which the 386330b48bdSThierry Reding * data sheet specifies we should deassert the reset pin. 387330b48bdSThierry Reding * 388330b48bdSThierry Reding * If it takes T1.max for the power to rise, we need to wait atleast 389330b48bdSThierry Reding * T2.min before deasserting the reset pin. If it takes T1.min for the 390330b48bdSThierry Reding * power to rise, we need to wait at most T2.max before deasserting the 391330b48bdSThierry Reding * reset pin. 392330b48bdSThierry Reding */ 393330b48bdSThierry Reding usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US, 394330b48bdSThierry Reding PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US); 395330b48bdSThierry Reding 396330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 1); 397330b48bdSThierry Reding 398330b48bdSThierry Reding /* wait 20ms after RST high */ 399330b48bdSThierry Reding usleep_range(20000, 30000); 400330b48bdSThierry Reding 401330b48bdSThierry Reding ret = ps8622_send_config(ps8622); 402330b48bdSThierry Reding if (ret) { 403330b48bdSThierry Reding DRM_ERROR("Failed to send config to bridge (%d)\n", ret); 404330b48bdSThierry Reding return; 405330b48bdSThierry Reding } 406330b48bdSThierry Reding 407330b48bdSThierry Reding ps8622->enabled = true; 408330b48bdSThierry Reding } 409330b48bdSThierry Reding 410330b48bdSThierry Reding static void ps8622_enable(struct drm_bridge *bridge) 411330b48bdSThierry Reding { 412330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 413330b48bdSThierry Reding 414330b48bdSThierry Reding if (drm_panel_enable(ps8622->panel)) { 415330b48bdSThierry Reding DRM_ERROR("failed to enable panel\n"); 416330b48bdSThierry Reding return; 417330b48bdSThierry Reding } 418330b48bdSThierry Reding } 419330b48bdSThierry Reding 420330b48bdSThierry Reding static void ps8622_disable(struct drm_bridge *bridge) 421330b48bdSThierry Reding { 422330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 423330b48bdSThierry Reding 424330b48bdSThierry Reding if (drm_panel_disable(ps8622->panel)) { 425330b48bdSThierry Reding DRM_ERROR("failed to disable panel\n"); 426330b48bdSThierry Reding return; 427330b48bdSThierry Reding } 428330b48bdSThierry Reding msleep(PS8622_PWMO_END_T12_MS); 429330b48bdSThierry Reding } 430330b48bdSThierry Reding 431330b48bdSThierry Reding static void ps8622_post_disable(struct drm_bridge *bridge) 432330b48bdSThierry Reding { 433330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 434330b48bdSThierry Reding 435330b48bdSThierry Reding if (!ps8622->enabled) 436330b48bdSThierry Reding return; 437330b48bdSThierry Reding 438330b48bdSThierry Reding ps8622->enabled = false; 439330b48bdSThierry Reding 440330b48bdSThierry Reding /* 441330b48bdSThierry Reding * This doesn't matter if the regulators are turned off, but something 442330b48bdSThierry Reding * else might keep them on. In that case, we want to assert the slp gpio 443330b48bdSThierry Reding * to lower power. 444330b48bdSThierry Reding */ 445330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_slp, 0); 446330b48bdSThierry Reding 447330b48bdSThierry Reding if (drm_panel_unprepare(ps8622->panel)) { 448330b48bdSThierry Reding DRM_ERROR("failed to unprepare panel\n"); 449330b48bdSThierry Reding return; 450330b48bdSThierry Reding } 451330b48bdSThierry Reding 452330b48bdSThierry Reding if (ps8622->v12) 453330b48bdSThierry Reding regulator_disable(ps8622->v12); 454330b48bdSThierry Reding 455330b48bdSThierry Reding /* 456330b48bdSThierry Reding * Sleep for at least the amount of time that it takes the power rail to 457330b48bdSThierry Reding * fall to prevent asserting the rst gpio from doing anything. 458330b48bdSThierry Reding */ 459330b48bdSThierry Reding usleep_range(PS8622_POWER_FALL_T16_MAX_US, 460330b48bdSThierry Reding 2 * PS8622_POWER_FALL_T16_MAX_US); 461330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 0); 462330b48bdSThierry Reding 463330b48bdSThierry Reding msleep(PS8622_POWER_OFF_T17_MS); 464330b48bdSThierry Reding } 465330b48bdSThierry Reding 466330b48bdSThierry Reding static int ps8622_get_modes(struct drm_connector *connector) 467330b48bdSThierry Reding { 468330b48bdSThierry Reding struct ps8622_bridge *ps8622; 469330b48bdSThierry Reding 470330b48bdSThierry Reding ps8622 = connector_to_ps8622(connector); 471330b48bdSThierry Reding 472330b48bdSThierry Reding return drm_panel_get_modes(ps8622->panel); 473330b48bdSThierry Reding } 474330b48bdSThierry Reding 475330b48bdSThierry Reding static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = { 476330b48bdSThierry Reding .get_modes = ps8622_get_modes, 477330b48bdSThierry Reding }; 478330b48bdSThierry Reding 479330b48bdSThierry Reding static const struct drm_connector_funcs ps8622_connector_funcs = { 480330b48bdSThierry Reding .fill_modes = drm_helper_probe_single_connector_modes, 481bf3b123eSMarek Vasut .destroy = drm_connector_cleanup, 482330b48bdSThierry Reding .reset = drm_atomic_helper_connector_reset, 483330b48bdSThierry Reding .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 484330b48bdSThierry Reding .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 485330b48bdSThierry Reding }; 486330b48bdSThierry Reding 487330b48bdSThierry Reding static int ps8622_attach(struct drm_bridge *bridge) 488330b48bdSThierry Reding { 489330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 490330b48bdSThierry Reding int ret; 491330b48bdSThierry Reding 492330b48bdSThierry Reding if (!bridge->encoder) { 493330b48bdSThierry Reding DRM_ERROR("Parent encoder object not found"); 494330b48bdSThierry Reding return -ENODEV; 495330b48bdSThierry Reding } 496330b48bdSThierry Reding 497330b48bdSThierry Reding ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD; 498330b48bdSThierry Reding ret = drm_connector_init(bridge->dev, &ps8622->connector, 499330b48bdSThierry Reding &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS); 500330b48bdSThierry Reding if (ret) { 501330b48bdSThierry Reding DRM_ERROR("Failed to initialize connector with drm\n"); 502330b48bdSThierry Reding return ret; 503330b48bdSThierry Reding } 504330b48bdSThierry Reding drm_connector_helper_add(&ps8622->connector, 505330b48bdSThierry Reding &ps8622_connector_helper_funcs); 506330b48bdSThierry Reding drm_connector_register(&ps8622->connector); 507cde4c44dSDaniel Vetter drm_connector_attach_encoder(&ps8622->connector, 508330b48bdSThierry Reding bridge->encoder); 509330b48bdSThierry Reding 510330b48bdSThierry Reding if (ps8622->panel) 511330b48bdSThierry Reding drm_panel_attach(ps8622->panel, &ps8622->connector); 512330b48bdSThierry Reding 513330b48bdSThierry Reding drm_helper_hpd_irq_event(ps8622->connector.dev); 514330b48bdSThierry Reding 515330b48bdSThierry Reding return ret; 516330b48bdSThierry Reding } 517330b48bdSThierry Reding 518330b48bdSThierry Reding static const struct drm_bridge_funcs ps8622_bridge_funcs = { 519330b48bdSThierry Reding .pre_enable = ps8622_pre_enable, 520330b48bdSThierry Reding .enable = ps8622_enable, 521330b48bdSThierry Reding .disable = ps8622_disable, 522330b48bdSThierry Reding .post_disable = ps8622_post_disable, 523330b48bdSThierry Reding .attach = ps8622_attach, 524330b48bdSThierry Reding }; 525330b48bdSThierry Reding 526330b48bdSThierry Reding static const struct of_device_id ps8622_devices[] = { 527330b48bdSThierry Reding {.compatible = "parade,ps8622",}, 528330b48bdSThierry Reding {.compatible = "parade,ps8625",}, 529330b48bdSThierry Reding {} 530330b48bdSThierry Reding }; 531330b48bdSThierry Reding MODULE_DEVICE_TABLE(of, ps8622_devices); 532330b48bdSThierry Reding 533330b48bdSThierry Reding static int ps8622_probe(struct i2c_client *client, 534330b48bdSThierry Reding const struct i2c_device_id *id) 535330b48bdSThierry Reding { 536330b48bdSThierry Reding struct device *dev = &client->dev; 537330b48bdSThierry Reding struct ps8622_bridge *ps8622; 538330b48bdSThierry Reding int ret; 539330b48bdSThierry Reding 540330b48bdSThierry Reding ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL); 541330b48bdSThierry Reding if (!ps8622) 542330b48bdSThierry Reding return -ENOMEM; 543330b48bdSThierry Reding 544ebc94461SRob Herring ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL); 545ebc94461SRob Herring if (ret) 546ebc94461SRob Herring return ret; 547330b48bdSThierry Reding 548330b48bdSThierry Reding ps8622->client = client; 549330b48bdSThierry Reding 550330b48bdSThierry Reding ps8622->v12 = devm_regulator_get(dev, "vdd12"); 551330b48bdSThierry Reding if (IS_ERR(ps8622->v12)) { 552330b48bdSThierry Reding dev_info(dev, "no 1.2v regulator found for PS8622\n"); 553330b48bdSThierry Reding ps8622->v12 = NULL; 554330b48bdSThierry Reding } 555330b48bdSThierry Reding 556330b48bdSThierry Reding ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH); 557330b48bdSThierry Reding if (IS_ERR(ps8622->gpio_slp)) { 558330b48bdSThierry Reding ret = PTR_ERR(ps8622->gpio_slp); 559330b48bdSThierry Reding dev_err(dev, "cannot get gpio_slp %d\n", ret); 560330b48bdSThierry Reding return ret; 561330b48bdSThierry Reding } 562330b48bdSThierry Reding 563330b48bdSThierry Reding /* 564330b48bdSThierry Reding * Assert the reset pin high to avoid the bridge being 565330b48bdSThierry Reding * initialized prematurely 566330b48bdSThierry Reding */ 567330b48bdSThierry Reding ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); 568330b48bdSThierry Reding if (IS_ERR(ps8622->gpio_rst)) { 569330b48bdSThierry Reding ret = PTR_ERR(ps8622->gpio_rst); 570330b48bdSThierry Reding dev_err(dev, "cannot get gpio_rst %d\n", ret); 571330b48bdSThierry Reding return ret; 572330b48bdSThierry Reding } 573330b48bdSThierry Reding 574330b48bdSThierry Reding ps8622->max_lane_count = id->driver_data; 575330b48bdSThierry Reding 576330b48bdSThierry Reding if (of_property_read_u32(dev->of_node, "lane-count", 577330b48bdSThierry Reding &ps8622->lane_count)) { 578330b48bdSThierry Reding ps8622->lane_count = ps8622->max_lane_count; 579330b48bdSThierry Reding } else if (ps8622->lane_count > ps8622->max_lane_count) { 580330b48bdSThierry Reding dev_info(dev, "lane-count property is too high," 581330b48bdSThierry Reding "using max_lane_count\n"); 582330b48bdSThierry Reding ps8622->lane_count = ps8622->max_lane_count; 583330b48bdSThierry Reding } 584330b48bdSThierry Reding 585330b48bdSThierry Reding if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) { 586330b48bdSThierry Reding ps8622->bl = backlight_device_register("ps8622-backlight", 587330b48bdSThierry Reding dev, ps8622, &ps8622_backlight_ops, 588330b48bdSThierry Reding NULL); 589330b48bdSThierry Reding if (IS_ERR(ps8622->bl)) { 590330b48bdSThierry Reding DRM_ERROR("failed to register backlight\n"); 591330b48bdSThierry Reding ret = PTR_ERR(ps8622->bl); 592330b48bdSThierry Reding ps8622->bl = NULL; 593330b48bdSThierry Reding return ret; 594330b48bdSThierry Reding } 595330b48bdSThierry Reding ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS; 596330b48bdSThierry Reding ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS; 597330b48bdSThierry Reding } 598330b48bdSThierry Reding 599330b48bdSThierry Reding ps8622->bridge.funcs = &ps8622_bridge_funcs; 600330b48bdSThierry Reding ps8622->bridge.of_node = dev->of_node; 601d0ceb3ecSInki Dae drm_bridge_add(&ps8622->bridge); 602330b48bdSThierry Reding 603330b48bdSThierry Reding i2c_set_clientdata(client, ps8622); 604330b48bdSThierry Reding 605330b48bdSThierry Reding return 0; 606330b48bdSThierry Reding } 607330b48bdSThierry Reding 608330b48bdSThierry Reding static int ps8622_remove(struct i2c_client *client) 609330b48bdSThierry Reding { 610330b48bdSThierry Reding struct ps8622_bridge *ps8622 = i2c_get_clientdata(client); 611330b48bdSThierry Reding 612330b48bdSThierry Reding backlight_device_unregister(ps8622->bl); 613330b48bdSThierry Reding drm_bridge_remove(&ps8622->bridge); 614330b48bdSThierry Reding 615330b48bdSThierry Reding return 0; 616330b48bdSThierry Reding } 617330b48bdSThierry Reding 618330b48bdSThierry Reding static const struct i2c_device_id ps8622_i2c_table[] = { 619330b48bdSThierry Reding /* Device type, max_lane_count */ 620330b48bdSThierry Reding {"ps8622", 1}, 621330b48bdSThierry Reding {"ps8625", 2}, 622330b48bdSThierry Reding {}, 623330b48bdSThierry Reding }; 624330b48bdSThierry Reding MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table); 625330b48bdSThierry Reding 626330b48bdSThierry Reding static struct i2c_driver ps8622_driver = { 627330b48bdSThierry Reding .id_table = ps8622_i2c_table, 628330b48bdSThierry Reding .probe = ps8622_probe, 629330b48bdSThierry Reding .remove = ps8622_remove, 630330b48bdSThierry Reding .driver = { 631330b48bdSThierry Reding .name = "ps8622", 632330b48bdSThierry Reding .of_match_table = ps8622_devices, 633330b48bdSThierry Reding }, 634330b48bdSThierry Reding }; 635330b48bdSThierry Reding module_i2c_driver(ps8622_driver); 636330b48bdSThierry Reding 637330b48bdSThierry Reding MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>"); 638330b48bdSThierry Reding MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver"); 639330b48bdSThierry Reding MODULE_LICENSE("GPL v2"); 640