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> 27330b48bdSThierry Reding 28ebc94461SRob Herring #include <drm/drm_of.h> 29330b48bdSThierry Reding #include <drm/drm_panel.h> 30330b48bdSThierry Reding 31330b48bdSThierry Reding #include "drmP.h" 32330b48bdSThierry Reding #include "drm_crtc.h" 33330b48bdSThierry Reding #include "drm_crtc_helper.h" 34330b48bdSThierry Reding #include "drm_atomic_helper.h" 35330b48bdSThierry Reding 36330b48bdSThierry Reding /* Brightness scale on the Parade chip */ 37330b48bdSThierry Reding #define PS8622_MAX_BRIGHTNESS 0xff 38330b48bdSThierry Reding 39330b48bdSThierry Reding /* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */ 40330b48bdSThierry Reding #define PS8622_POWER_RISE_T1_MIN_US 10 41330b48bdSThierry Reding #define PS8622_POWER_RISE_T1_MAX_US 10000 42330b48bdSThierry Reding #define PS8622_RST_HIGH_T2_MIN_US 3000 43330b48bdSThierry Reding #define PS8622_RST_HIGH_T2_MAX_US 30000 44330b48bdSThierry Reding #define PS8622_PWMO_END_T12_MS 200 45330b48bdSThierry Reding #define PS8622_POWER_FALL_T16_MAX_US 10000 46330b48bdSThierry Reding #define PS8622_POWER_OFF_T17_MS 500 47330b48bdSThierry Reding 48330b48bdSThierry Reding #if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \ 49330b48bdSThierry Reding (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US)) 50330b48bdSThierry Reding #error "T2.min + T1.max must be less than T2.max + T1.min" 51330b48bdSThierry Reding #endif 52330b48bdSThierry Reding 53330b48bdSThierry Reding struct ps8622_bridge { 54330b48bdSThierry Reding struct drm_connector connector; 55330b48bdSThierry Reding struct i2c_client *client; 56330b48bdSThierry Reding struct drm_bridge bridge; 57330b48bdSThierry Reding struct drm_panel *panel; 58330b48bdSThierry Reding struct regulator *v12; 59330b48bdSThierry Reding struct backlight_device *bl; 60330b48bdSThierry Reding 61330b48bdSThierry Reding struct gpio_desc *gpio_slp; 62330b48bdSThierry Reding struct gpio_desc *gpio_rst; 63330b48bdSThierry Reding 64330b48bdSThierry Reding u32 max_lane_count; 65330b48bdSThierry Reding u32 lane_count; 66330b48bdSThierry Reding 67330b48bdSThierry Reding bool enabled; 68330b48bdSThierry Reding }; 69330b48bdSThierry Reding 70330b48bdSThierry Reding static inline struct ps8622_bridge * 71330b48bdSThierry Reding bridge_to_ps8622(struct drm_bridge *bridge) 72330b48bdSThierry Reding { 73330b48bdSThierry Reding return container_of(bridge, struct ps8622_bridge, bridge); 74330b48bdSThierry Reding } 75330b48bdSThierry Reding 76330b48bdSThierry Reding static inline struct ps8622_bridge * 77330b48bdSThierry Reding connector_to_ps8622(struct drm_connector *connector) 78330b48bdSThierry Reding { 79330b48bdSThierry Reding return container_of(connector, struct ps8622_bridge, connector); 80330b48bdSThierry Reding } 81330b48bdSThierry Reding 82330b48bdSThierry Reding static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val) 83330b48bdSThierry Reding { 84330b48bdSThierry Reding int ret; 85330b48bdSThierry Reding struct i2c_adapter *adap = client->adapter; 86330b48bdSThierry Reding struct i2c_msg msg; 87330b48bdSThierry Reding u8 data[] = {reg, val}; 88330b48bdSThierry Reding 89330b48bdSThierry Reding msg.addr = client->addr + page; 90330b48bdSThierry Reding msg.flags = 0; 91330b48bdSThierry Reding msg.len = sizeof(data); 92330b48bdSThierry Reding msg.buf = data; 93330b48bdSThierry Reding 94330b48bdSThierry Reding ret = i2c_transfer(adap, &msg, 1); 95330b48bdSThierry Reding if (ret != 1) 96330b48bdSThierry Reding pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n", 97330b48bdSThierry Reding client->addr + page, reg, val, ret); 98330b48bdSThierry Reding return !(ret == 1); 99330b48bdSThierry Reding } 100330b48bdSThierry Reding 101330b48bdSThierry Reding static int ps8622_send_config(struct ps8622_bridge *ps8622) 102330b48bdSThierry Reding { 103330b48bdSThierry Reding struct i2c_client *cl = ps8622->client; 104330b48bdSThierry Reding int err = 0; 105330b48bdSThierry Reding 106330b48bdSThierry Reding /* HPD low */ 107330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xa1, 0x01); 108330b48bdSThierry Reding if (err) 109330b48bdSThierry Reding goto error; 110330b48bdSThierry Reding 111330b48bdSThierry Reding /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */ 112330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x14, 0x01); 113330b48bdSThierry Reding if (err) 114330b48bdSThierry Reding goto error; 115330b48bdSThierry Reding 116330b48bdSThierry Reding /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */ 117330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xe3, 0x20); 118330b48bdSThierry Reding if (err) 119330b48bdSThierry Reding goto error; 120330b48bdSThierry Reding 121330b48bdSThierry Reding /* [7] RCO SS enable */ 122330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xe2, 0x80); 123330b48bdSThierry Reding if (err) 124330b48bdSThierry Reding goto error; 125330b48bdSThierry Reding 126330b48bdSThierry Reding /* RPHY Setting 127330b48bdSThierry Reding * [3:2] CDR tune wait cycle before measure for fine tune 128330b48bdSThierry Reding * b00: 1us b01: 0.5us b10:2us, b11: 4us 129330b48bdSThierry Reding */ 130330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x8a, 0x0c); 131330b48bdSThierry Reding if (err) 132330b48bdSThierry Reding goto error; 133330b48bdSThierry Reding 134330b48bdSThierry Reding /* [3] RFD always on */ 135330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x89, 0x08); 136330b48bdSThierry Reding if (err) 137330b48bdSThierry Reding goto error; 138330b48bdSThierry Reding 139330b48bdSThierry Reding /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */ 140330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x71, 0x2d); 141330b48bdSThierry Reding if (err) 142330b48bdSThierry Reding goto error; 143330b48bdSThierry Reding 144330b48bdSThierry Reding /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */ 145330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7d, 0x07); 146330b48bdSThierry Reding if (err) 147330b48bdSThierry Reding goto error; 148330b48bdSThierry Reding 149330b48bdSThierry Reding /* [1:0] Fmin=+4bands */ 150330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7b, 0x00); 151330b48bdSThierry Reding if (err) 152330b48bdSThierry Reding goto error; 153330b48bdSThierry Reding 154330b48bdSThierry Reding /* [7:5] DCO_FTRNG=+-40% */ 155330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7a, 0xfd); 156330b48bdSThierry Reding if (err) 157330b48bdSThierry Reding goto error; 158330b48bdSThierry Reding 159330b48bdSThierry Reding /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */ 160330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc0, 0x12); 161330b48bdSThierry Reding if (err) 162330b48bdSThierry Reding goto error; 163330b48bdSThierry Reding 164330b48bdSThierry Reding /* Gitune=-37% */ 165330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc1, 0x92); 166330b48bdSThierry Reding if (err) 167330b48bdSThierry Reding goto error; 168330b48bdSThierry Reding 169330b48bdSThierry Reding /* Fbstep=100% */ 170330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc2, 0x1c); 171330b48bdSThierry Reding if (err) 172330b48bdSThierry Reding goto error; 173330b48bdSThierry Reding 174330b48bdSThierry Reding /* [7] LOS signal disable */ 175330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x32, 0x80); 176330b48bdSThierry Reding if (err) 177330b48bdSThierry Reding goto error; 178330b48bdSThierry Reding 179330b48bdSThierry Reding /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */ 180330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x00, 0xb0); 181330b48bdSThierry Reding if (err) 182330b48bdSThierry Reding goto error; 183330b48bdSThierry Reding 184330b48bdSThierry Reding /* [7:6] Right-bar GPIO output strength is 8mA */ 185330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x15, 0x40); 186330b48bdSThierry Reding if (err) 187330b48bdSThierry Reding goto error; 188330b48bdSThierry Reding 189330b48bdSThierry Reding /* EQ Training State Machine Setting, RCO calibration start */ 190330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x54, 0x10); 191330b48bdSThierry Reding if (err) 192330b48bdSThierry Reding goto error; 193330b48bdSThierry Reding 194330b48bdSThierry Reding /* Logic, needs more than 10 I2C command */ 195330b48bdSThierry Reding /* [4:0] MAX_LANE_COUNT set to max supported lanes */ 196330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count); 197330b48bdSThierry Reding if (err) 198330b48bdSThierry Reding goto error; 199330b48bdSThierry Reding 200330b48bdSThierry Reding /* [4:0] LANE_COUNT_SET set to chosen lane count */ 201330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count); 202330b48bdSThierry Reding if (err) 203330b48bdSThierry Reding goto error; 204330b48bdSThierry Reding 205330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x52, 0x20); 206330b48bdSThierry Reding if (err) 207330b48bdSThierry Reding goto error; 208330b48bdSThierry Reding 209330b48bdSThierry Reding /* HPD CP toggle enable */ 210330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0xf1, 0x03); 211330b48bdSThierry Reding if (err) 212330b48bdSThierry Reding goto error; 213330b48bdSThierry Reding 214330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x62, 0x41); 215330b48bdSThierry Reding if (err) 216330b48bdSThierry Reding goto error; 217330b48bdSThierry Reding 218330b48bdSThierry Reding /* Counter number, add 1ms counter delay */ 219330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0xf6, 0x01); 220330b48bdSThierry Reding if (err) 221330b48bdSThierry Reding goto error; 222330b48bdSThierry Reding 223330b48bdSThierry Reding /* [6]PWM function control by DPCD0040f[7], default is PWM block */ 224330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x77, 0x06); 225330b48bdSThierry Reding if (err) 226330b48bdSThierry Reding goto error; 227330b48bdSThierry Reding 228330b48bdSThierry Reding /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */ 229330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x4c, 0x04); 230330b48bdSThierry Reding if (err) 231330b48bdSThierry Reding goto error; 232330b48bdSThierry Reding 233330b48bdSThierry Reding /* DPCD00400='h00, Parade OUI ='h001cf8 */ 234330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc0, 0x00); 235330b48bdSThierry Reding if (err) 236330b48bdSThierry Reding goto error; 237330b48bdSThierry Reding 238330b48bdSThierry Reding /* DPCD00401='h1c */ 239330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc1, 0x1c); 240330b48bdSThierry Reding if (err) 241330b48bdSThierry Reding goto error; 242330b48bdSThierry Reding 243330b48bdSThierry Reding /* DPCD00402='hf8 */ 244330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc2, 0xf8); 245330b48bdSThierry Reding if (err) 246330b48bdSThierry Reding goto error; 247330b48bdSThierry Reding 248330b48bdSThierry Reding /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */ 249330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc3, 0x44); 250330b48bdSThierry Reding if (err) 251330b48bdSThierry Reding goto error; 252330b48bdSThierry Reding 253330b48bdSThierry Reding /* DPCD404 */ 254330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc4, 0x32); 255330b48bdSThierry Reding if (err) 256330b48bdSThierry Reding goto error; 257330b48bdSThierry Reding 258330b48bdSThierry Reding /* DPCD405 */ 259330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc5, 0x53); 260330b48bdSThierry Reding if (err) 261330b48bdSThierry Reding goto error; 262330b48bdSThierry Reding 263330b48bdSThierry Reding /* DPCD406 */ 264330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc6, 0x4c); 265330b48bdSThierry Reding if (err) 266330b48bdSThierry Reding goto error; 267330b48bdSThierry Reding 268330b48bdSThierry Reding /* DPCD407 */ 269330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc7, 0x56); 270330b48bdSThierry Reding if (err) 271330b48bdSThierry Reding goto error; 272330b48bdSThierry Reding 273330b48bdSThierry Reding /* DPCD408 */ 274330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc8, 0x35); 275330b48bdSThierry Reding if (err) 276330b48bdSThierry Reding goto error; 277330b48bdSThierry Reding 278330b48bdSThierry Reding /* DPCD40A, Initial Code major revision '01' */ 279330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xca, 0x01); 280330b48bdSThierry Reding if (err) 281330b48bdSThierry Reding goto error; 282330b48bdSThierry Reding 283330b48bdSThierry Reding /* DPCD40B, Initial Code minor revision '05' */ 284330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xcb, 0x05); 285330b48bdSThierry Reding if (err) 286330b48bdSThierry Reding goto error; 287330b48bdSThierry Reding 288330b48bdSThierry Reding 289330b48bdSThierry Reding if (ps8622->bl) { 290330b48bdSThierry Reding /* DPCD720, internal PWM */ 291330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa5, 0xa0); 292330b48bdSThierry Reding if (err) 293330b48bdSThierry Reding goto error; 294330b48bdSThierry Reding 295330b48bdSThierry Reding /* FFh for 100% brightness, 0h for 0% brightness */ 296330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa7, 297330b48bdSThierry Reding ps8622->bl->props.brightness); 298330b48bdSThierry Reding if (err) 299330b48bdSThierry Reding goto error; 300330b48bdSThierry Reding } else { 301330b48bdSThierry Reding /* DPCD720, external PWM */ 302330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa5, 0x80); 303330b48bdSThierry Reding if (err) 304330b48bdSThierry Reding goto error; 305330b48bdSThierry Reding } 306330b48bdSThierry Reding 307330b48bdSThierry Reding /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */ 308330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xcc, 0x13); 309330b48bdSThierry Reding if (err) 310330b48bdSThierry Reding goto error; 311330b48bdSThierry Reding 312330b48bdSThierry Reding /* Enable SSC set by register */ 313330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xb1, 0x20); 314330b48bdSThierry Reding if (err) 315330b48bdSThierry Reding goto error; 316330b48bdSThierry Reding 317330b48bdSThierry Reding /* Set SSC enabled and +/-1% central spreading */ 318330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x10, 0x16); 319330b48bdSThierry Reding if (err) 320330b48bdSThierry Reding goto error; 321330b48bdSThierry Reding 322330b48bdSThierry Reding /* Logic end */ 323330b48bdSThierry Reding /* MPU Clock source: LC => RCO */ 324330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x59, 0x60); 325330b48bdSThierry Reding if (err) 326330b48bdSThierry Reding goto error; 327330b48bdSThierry Reding 328330b48bdSThierry Reding /* LC -> RCO */ 329330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x54, 0x14); 330330b48bdSThierry Reding if (err) 331330b48bdSThierry Reding goto error; 332330b48bdSThierry Reding 333330b48bdSThierry Reding /* HPD high */ 334330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xa1, 0x91); 335330b48bdSThierry Reding 336330b48bdSThierry Reding error: 337330b48bdSThierry Reding return err ? -EIO : 0; 338330b48bdSThierry Reding } 339330b48bdSThierry Reding 340330b48bdSThierry Reding static int ps8622_backlight_update(struct backlight_device *bl) 341330b48bdSThierry Reding { 342330b48bdSThierry Reding struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev); 343330b48bdSThierry Reding int ret, brightness = bl->props.brightness; 344330b48bdSThierry Reding 345330b48bdSThierry Reding if (bl->props.power != FB_BLANK_UNBLANK || 346330b48bdSThierry Reding bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) 347330b48bdSThierry Reding brightness = 0; 348330b48bdSThierry Reding 349330b48bdSThierry Reding if (!ps8622->enabled) 350330b48bdSThierry Reding return -EINVAL; 351330b48bdSThierry Reding 352330b48bdSThierry Reding ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness); 353330b48bdSThierry Reding 354330b48bdSThierry Reding return ret; 355330b48bdSThierry Reding } 356330b48bdSThierry Reding 357330b48bdSThierry Reding static const struct backlight_ops ps8622_backlight_ops = { 358330b48bdSThierry Reding .update_status = ps8622_backlight_update, 359330b48bdSThierry Reding }; 360330b48bdSThierry Reding 361330b48bdSThierry Reding static void ps8622_pre_enable(struct drm_bridge *bridge) 362330b48bdSThierry Reding { 363330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 364330b48bdSThierry Reding int ret; 365330b48bdSThierry Reding 366330b48bdSThierry Reding if (ps8622->enabled) 367330b48bdSThierry Reding return; 368330b48bdSThierry Reding 369330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 0); 370330b48bdSThierry Reding 371330b48bdSThierry Reding if (ps8622->v12) { 372330b48bdSThierry Reding ret = regulator_enable(ps8622->v12); 373330b48bdSThierry Reding if (ret) 374330b48bdSThierry Reding DRM_ERROR("fails to enable ps8622->v12"); 375330b48bdSThierry Reding } 376330b48bdSThierry Reding 377330b48bdSThierry Reding if (drm_panel_prepare(ps8622->panel)) { 378330b48bdSThierry Reding DRM_ERROR("failed to prepare panel\n"); 379330b48bdSThierry Reding return; 380330b48bdSThierry Reding } 381330b48bdSThierry Reding 382330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_slp, 1); 383330b48bdSThierry Reding 384330b48bdSThierry Reding /* 385330b48bdSThierry Reding * T1 is the range of time that it takes for the power to rise after we 386330b48bdSThierry Reding * enable the lcd/ps8622 fet. T2 is the range of time in which the 387330b48bdSThierry Reding * data sheet specifies we should deassert the reset pin. 388330b48bdSThierry Reding * 389330b48bdSThierry Reding * If it takes T1.max for the power to rise, we need to wait atleast 390330b48bdSThierry Reding * T2.min before deasserting the reset pin. If it takes T1.min for the 391330b48bdSThierry Reding * power to rise, we need to wait at most T2.max before deasserting the 392330b48bdSThierry Reding * reset pin. 393330b48bdSThierry Reding */ 394330b48bdSThierry Reding usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US, 395330b48bdSThierry Reding PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US); 396330b48bdSThierry Reding 397330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 1); 398330b48bdSThierry Reding 399330b48bdSThierry Reding /* wait 20ms after RST high */ 400330b48bdSThierry Reding usleep_range(20000, 30000); 401330b48bdSThierry Reding 402330b48bdSThierry Reding ret = ps8622_send_config(ps8622); 403330b48bdSThierry Reding if (ret) { 404330b48bdSThierry Reding DRM_ERROR("Failed to send config to bridge (%d)\n", ret); 405330b48bdSThierry Reding return; 406330b48bdSThierry Reding } 407330b48bdSThierry Reding 408330b48bdSThierry Reding ps8622->enabled = true; 409330b48bdSThierry Reding } 410330b48bdSThierry Reding 411330b48bdSThierry Reding static void ps8622_enable(struct drm_bridge *bridge) 412330b48bdSThierry Reding { 413330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 414330b48bdSThierry Reding 415330b48bdSThierry Reding if (drm_panel_enable(ps8622->panel)) { 416330b48bdSThierry Reding DRM_ERROR("failed to enable panel\n"); 417330b48bdSThierry Reding return; 418330b48bdSThierry Reding } 419330b48bdSThierry Reding } 420330b48bdSThierry Reding 421330b48bdSThierry Reding static void ps8622_disable(struct drm_bridge *bridge) 422330b48bdSThierry Reding { 423330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 424330b48bdSThierry Reding 425330b48bdSThierry Reding if (drm_panel_disable(ps8622->panel)) { 426330b48bdSThierry Reding DRM_ERROR("failed to disable panel\n"); 427330b48bdSThierry Reding return; 428330b48bdSThierry Reding } 429330b48bdSThierry Reding msleep(PS8622_PWMO_END_T12_MS); 430330b48bdSThierry Reding } 431330b48bdSThierry Reding 432330b48bdSThierry Reding static void ps8622_post_disable(struct drm_bridge *bridge) 433330b48bdSThierry Reding { 434330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 435330b48bdSThierry Reding 436330b48bdSThierry Reding if (!ps8622->enabled) 437330b48bdSThierry Reding return; 438330b48bdSThierry Reding 439330b48bdSThierry Reding ps8622->enabled = false; 440330b48bdSThierry Reding 441330b48bdSThierry Reding /* 442330b48bdSThierry Reding * This doesn't matter if the regulators are turned off, but something 443330b48bdSThierry Reding * else might keep them on. In that case, we want to assert the slp gpio 444330b48bdSThierry Reding * to lower power. 445330b48bdSThierry Reding */ 446330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_slp, 0); 447330b48bdSThierry Reding 448330b48bdSThierry Reding if (drm_panel_unprepare(ps8622->panel)) { 449330b48bdSThierry Reding DRM_ERROR("failed to unprepare panel\n"); 450330b48bdSThierry Reding return; 451330b48bdSThierry Reding } 452330b48bdSThierry Reding 453330b48bdSThierry Reding if (ps8622->v12) 454330b48bdSThierry Reding regulator_disable(ps8622->v12); 455330b48bdSThierry Reding 456330b48bdSThierry Reding /* 457330b48bdSThierry Reding * Sleep for at least the amount of time that it takes the power rail to 458330b48bdSThierry Reding * fall to prevent asserting the rst gpio from doing anything. 459330b48bdSThierry Reding */ 460330b48bdSThierry Reding usleep_range(PS8622_POWER_FALL_T16_MAX_US, 461330b48bdSThierry Reding 2 * PS8622_POWER_FALL_T16_MAX_US); 462330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 0); 463330b48bdSThierry Reding 464330b48bdSThierry Reding msleep(PS8622_POWER_OFF_T17_MS); 465330b48bdSThierry Reding } 466330b48bdSThierry Reding 467330b48bdSThierry Reding static int ps8622_get_modes(struct drm_connector *connector) 468330b48bdSThierry Reding { 469330b48bdSThierry Reding struct ps8622_bridge *ps8622; 470330b48bdSThierry Reding 471330b48bdSThierry Reding ps8622 = connector_to_ps8622(connector); 472330b48bdSThierry Reding 473330b48bdSThierry Reding return drm_panel_get_modes(ps8622->panel); 474330b48bdSThierry Reding } 475330b48bdSThierry Reding 476330b48bdSThierry Reding static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = { 477330b48bdSThierry Reding .get_modes = ps8622_get_modes, 478330b48bdSThierry Reding }; 479330b48bdSThierry Reding 480330b48bdSThierry Reding static const struct drm_connector_funcs ps8622_connector_funcs = { 481330b48bdSThierry Reding .dpms = drm_atomic_helper_connector_dpms, 482330b48bdSThierry Reding .fill_modes = drm_helper_probe_single_connector_modes, 483bf3b123eSMarek Vasut .destroy = drm_connector_cleanup, 484330b48bdSThierry Reding .reset = drm_atomic_helper_connector_reset, 485330b48bdSThierry Reding .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 486330b48bdSThierry Reding .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 487330b48bdSThierry Reding }; 488330b48bdSThierry Reding 489330b48bdSThierry Reding static int ps8622_attach(struct drm_bridge *bridge) 490330b48bdSThierry Reding { 491330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 492330b48bdSThierry Reding int ret; 493330b48bdSThierry Reding 494330b48bdSThierry Reding if (!bridge->encoder) { 495330b48bdSThierry Reding DRM_ERROR("Parent encoder object not found"); 496330b48bdSThierry Reding return -ENODEV; 497330b48bdSThierry Reding } 498330b48bdSThierry Reding 499330b48bdSThierry Reding ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD; 500330b48bdSThierry Reding ret = drm_connector_init(bridge->dev, &ps8622->connector, 501330b48bdSThierry Reding &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS); 502330b48bdSThierry Reding if (ret) { 503330b48bdSThierry Reding DRM_ERROR("Failed to initialize connector with drm\n"); 504330b48bdSThierry Reding return ret; 505330b48bdSThierry Reding } 506330b48bdSThierry Reding drm_connector_helper_add(&ps8622->connector, 507330b48bdSThierry Reding &ps8622_connector_helper_funcs); 508330b48bdSThierry Reding drm_connector_register(&ps8622->connector); 509330b48bdSThierry Reding drm_mode_connector_attach_encoder(&ps8622->connector, 510330b48bdSThierry Reding bridge->encoder); 511330b48bdSThierry Reding 512330b48bdSThierry Reding if (ps8622->panel) 513330b48bdSThierry Reding drm_panel_attach(ps8622->panel, &ps8622->connector); 514330b48bdSThierry Reding 515330b48bdSThierry Reding drm_helper_hpd_irq_event(ps8622->connector.dev); 516330b48bdSThierry Reding 517330b48bdSThierry Reding return ret; 518330b48bdSThierry Reding } 519330b48bdSThierry Reding 520330b48bdSThierry Reding static const struct drm_bridge_funcs ps8622_bridge_funcs = { 521330b48bdSThierry Reding .pre_enable = ps8622_pre_enable, 522330b48bdSThierry Reding .enable = ps8622_enable, 523330b48bdSThierry Reding .disable = ps8622_disable, 524330b48bdSThierry Reding .post_disable = ps8622_post_disable, 525330b48bdSThierry Reding .attach = ps8622_attach, 526330b48bdSThierry Reding }; 527330b48bdSThierry Reding 528330b48bdSThierry Reding static const struct of_device_id ps8622_devices[] = { 529330b48bdSThierry Reding {.compatible = "parade,ps8622",}, 530330b48bdSThierry Reding {.compatible = "parade,ps8625",}, 531330b48bdSThierry Reding {} 532330b48bdSThierry Reding }; 533330b48bdSThierry Reding MODULE_DEVICE_TABLE(of, ps8622_devices); 534330b48bdSThierry Reding 535330b48bdSThierry Reding static int ps8622_probe(struct i2c_client *client, 536330b48bdSThierry Reding const struct i2c_device_id *id) 537330b48bdSThierry Reding { 538330b48bdSThierry Reding struct device *dev = &client->dev; 539330b48bdSThierry Reding struct ps8622_bridge *ps8622; 540330b48bdSThierry Reding int ret; 541330b48bdSThierry Reding 542330b48bdSThierry Reding ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL); 543330b48bdSThierry Reding if (!ps8622) 544330b48bdSThierry Reding return -ENOMEM; 545330b48bdSThierry Reding 546ebc94461SRob Herring ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL); 547ebc94461SRob Herring if (ret) 548ebc94461SRob Herring return ret; 549330b48bdSThierry Reding 550330b48bdSThierry Reding ps8622->client = client; 551330b48bdSThierry Reding 552330b48bdSThierry Reding ps8622->v12 = devm_regulator_get(dev, "vdd12"); 553330b48bdSThierry Reding if (IS_ERR(ps8622->v12)) { 554330b48bdSThierry Reding dev_info(dev, "no 1.2v regulator found for PS8622\n"); 555330b48bdSThierry Reding ps8622->v12 = NULL; 556330b48bdSThierry Reding } 557330b48bdSThierry Reding 558330b48bdSThierry Reding ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH); 559330b48bdSThierry Reding if (IS_ERR(ps8622->gpio_slp)) { 560330b48bdSThierry Reding ret = PTR_ERR(ps8622->gpio_slp); 561330b48bdSThierry Reding dev_err(dev, "cannot get gpio_slp %d\n", ret); 562330b48bdSThierry Reding return ret; 563330b48bdSThierry Reding } 564330b48bdSThierry Reding 565330b48bdSThierry Reding /* 566330b48bdSThierry Reding * Assert the reset pin high to avoid the bridge being 567330b48bdSThierry Reding * initialized prematurely 568330b48bdSThierry Reding */ 569330b48bdSThierry Reding ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); 570330b48bdSThierry Reding if (IS_ERR(ps8622->gpio_rst)) { 571330b48bdSThierry Reding ret = PTR_ERR(ps8622->gpio_rst); 572330b48bdSThierry Reding dev_err(dev, "cannot get gpio_rst %d\n", ret); 573330b48bdSThierry Reding return ret; 574330b48bdSThierry Reding } 575330b48bdSThierry Reding 576330b48bdSThierry Reding ps8622->max_lane_count = id->driver_data; 577330b48bdSThierry Reding 578330b48bdSThierry Reding if (of_property_read_u32(dev->of_node, "lane-count", 579330b48bdSThierry Reding &ps8622->lane_count)) { 580330b48bdSThierry Reding ps8622->lane_count = ps8622->max_lane_count; 581330b48bdSThierry Reding } else if (ps8622->lane_count > ps8622->max_lane_count) { 582330b48bdSThierry Reding dev_info(dev, "lane-count property is too high," 583330b48bdSThierry Reding "using max_lane_count\n"); 584330b48bdSThierry Reding ps8622->lane_count = ps8622->max_lane_count; 585330b48bdSThierry Reding } 586330b48bdSThierry Reding 587330b48bdSThierry Reding if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) { 588330b48bdSThierry Reding ps8622->bl = backlight_device_register("ps8622-backlight", 589330b48bdSThierry Reding dev, ps8622, &ps8622_backlight_ops, 590330b48bdSThierry Reding NULL); 591330b48bdSThierry Reding if (IS_ERR(ps8622->bl)) { 592330b48bdSThierry Reding DRM_ERROR("failed to register backlight\n"); 593330b48bdSThierry Reding ret = PTR_ERR(ps8622->bl); 594330b48bdSThierry Reding ps8622->bl = NULL; 595330b48bdSThierry Reding return ret; 596330b48bdSThierry Reding } 597330b48bdSThierry Reding ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS; 598330b48bdSThierry Reding ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS; 599330b48bdSThierry Reding } 600330b48bdSThierry Reding 601330b48bdSThierry Reding ps8622->bridge.funcs = &ps8622_bridge_funcs; 602330b48bdSThierry Reding ps8622->bridge.of_node = dev->of_node; 603330b48bdSThierry Reding ret = drm_bridge_add(&ps8622->bridge); 604330b48bdSThierry Reding if (ret) { 605330b48bdSThierry Reding DRM_ERROR("Failed to add bridge\n"); 606330b48bdSThierry Reding return ret; 607330b48bdSThierry Reding } 608330b48bdSThierry Reding 609330b48bdSThierry Reding i2c_set_clientdata(client, ps8622); 610330b48bdSThierry Reding 611330b48bdSThierry Reding return 0; 612330b48bdSThierry Reding } 613330b48bdSThierry Reding 614330b48bdSThierry Reding static int ps8622_remove(struct i2c_client *client) 615330b48bdSThierry Reding { 616330b48bdSThierry Reding struct ps8622_bridge *ps8622 = i2c_get_clientdata(client); 617330b48bdSThierry Reding 618330b48bdSThierry Reding backlight_device_unregister(ps8622->bl); 619330b48bdSThierry Reding drm_bridge_remove(&ps8622->bridge); 620330b48bdSThierry Reding 621330b48bdSThierry Reding return 0; 622330b48bdSThierry Reding } 623330b48bdSThierry Reding 624330b48bdSThierry Reding static const struct i2c_device_id ps8622_i2c_table[] = { 625330b48bdSThierry Reding /* Device type, max_lane_count */ 626330b48bdSThierry Reding {"ps8622", 1}, 627330b48bdSThierry Reding {"ps8625", 2}, 628330b48bdSThierry Reding {}, 629330b48bdSThierry Reding }; 630330b48bdSThierry Reding MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table); 631330b48bdSThierry Reding 632330b48bdSThierry Reding static struct i2c_driver ps8622_driver = { 633330b48bdSThierry Reding .id_table = ps8622_i2c_table, 634330b48bdSThierry Reding .probe = ps8622_probe, 635330b48bdSThierry Reding .remove = ps8622_remove, 636330b48bdSThierry Reding .driver = { 637330b48bdSThierry Reding .name = "ps8622", 638330b48bdSThierry Reding .of_match_table = ps8622_devices, 639330b48bdSThierry Reding }, 640330b48bdSThierry Reding }; 641330b48bdSThierry Reding module_i2c_driver(ps8622_driver); 642330b48bdSThierry Reding 643330b48bdSThierry Reding MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>"); 644330b48bdSThierry Reding MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver"); 645330b48bdSThierry Reding MODULE_LICENSE("GPL v2"); 646