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/fb.h> 20330b48bdSThierry Reding #include <linux/gpio.h> 21330b48bdSThierry Reding #include <linux/gpio/consumer.h> 22330b48bdSThierry Reding #include <linux/i2c.h> 23330b48bdSThierry Reding #include <linux/module.h> 24330b48bdSThierry Reding #include <linux/of.h> 25330b48bdSThierry Reding #include <linux/of_device.h> 26330b48bdSThierry Reding #include <linux/of_graph.h> 27330b48bdSThierry Reding #include <linux/pm.h> 28330b48bdSThierry Reding #include <linux/regulator/consumer.h> 29330b48bdSThierry Reding 30330b48bdSThierry Reding #include <drm/drm_panel.h> 31330b48bdSThierry Reding 32330b48bdSThierry Reding #include "drmP.h" 33330b48bdSThierry Reding #include "drm_crtc.h" 34330b48bdSThierry Reding #include "drm_crtc_helper.h" 35330b48bdSThierry Reding #include "drm_atomic_helper.h" 36330b48bdSThierry Reding 37330b48bdSThierry Reding /* Brightness scale on the Parade chip */ 38330b48bdSThierry Reding #define PS8622_MAX_BRIGHTNESS 0xff 39330b48bdSThierry Reding 40330b48bdSThierry Reding /* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */ 41330b48bdSThierry Reding #define PS8622_POWER_RISE_T1_MIN_US 10 42330b48bdSThierry Reding #define PS8622_POWER_RISE_T1_MAX_US 10000 43330b48bdSThierry Reding #define PS8622_RST_HIGH_T2_MIN_US 3000 44330b48bdSThierry Reding #define PS8622_RST_HIGH_T2_MAX_US 30000 45330b48bdSThierry Reding #define PS8622_PWMO_END_T12_MS 200 46330b48bdSThierry Reding #define PS8622_POWER_FALL_T16_MAX_US 10000 47330b48bdSThierry Reding #define PS8622_POWER_OFF_T17_MS 500 48330b48bdSThierry Reding 49330b48bdSThierry Reding #if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \ 50330b48bdSThierry Reding (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US)) 51330b48bdSThierry Reding #error "T2.min + T1.max must be less than T2.max + T1.min" 52330b48bdSThierry Reding #endif 53330b48bdSThierry Reding 54330b48bdSThierry Reding struct ps8622_bridge { 55330b48bdSThierry Reding struct drm_connector connector; 56330b48bdSThierry Reding struct i2c_client *client; 57330b48bdSThierry Reding struct drm_bridge bridge; 58330b48bdSThierry Reding struct drm_panel *panel; 59330b48bdSThierry Reding struct regulator *v12; 60330b48bdSThierry Reding struct backlight_device *bl; 61330b48bdSThierry Reding 62330b48bdSThierry Reding struct gpio_desc *gpio_slp; 63330b48bdSThierry Reding struct gpio_desc *gpio_rst; 64330b48bdSThierry Reding 65330b48bdSThierry Reding u32 max_lane_count; 66330b48bdSThierry Reding u32 lane_count; 67330b48bdSThierry Reding 68330b48bdSThierry Reding bool enabled; 69330b48bdSThierry Reding }; 70330b48bdSThierry Reding 71330b48bdSThierry Reding static inline struct ps8622_bridge * 72330b48bdSThierry Reding bridge_to_ps8622(struct drm_bridge *bridge) 73330b48bdSThierry Reding { 74330b48bdSThierry Reding return container_of(bridge, struct ps8622_bridge, bridge); 75330b48bdSThierry Reding } 76330b48bdSThierry Reding 77330b48bdSThierry Reding static inline struct ps8622_bridge * 78330b48bdSThierry Reding connector_to_ps8622(struct drm_connector *connector) 79330b48bdSThierry Reding { 80330b48bdSThierry Reding return container_of(connector, struct ps8622_bridge, connector); 81330b48bdSThierry Reding } 82330b48bdSThierry Reding 83330b48bdSThierry Reding static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val) 84330b48bdSThierry Reding { 85330b48bdSThierry Reding int ret; 86330b48bdSThierry Reding struct i2c_adapter *adap = client->adapter; 87330b48bdSThierry Reding struct i2c_msg msg; 88330b48bdSThierry Reding u8 data[] = {reg, val}; 89330b48bdSThierry Reding 90330b48bdSThierry Reding msg.addr = client->addr + page; 91330b48bdSThierry Reding msg.flags = 0; 92330b48bdSThierry Reding msg.len = sizeof(data); 93330b48bdSThierry Reding msg.buf = data; 94330b48bdSThierry Reding 95330b48bdSThierry Reding ret = i2c_transfer(adap, &msg, 1); 96330b48bdSThierry Reding if (ret != 1) 97330b48bdSThierry Reding pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n", 98330b48bdSThierry Reding client->addr + page, reg, val, ret); 99330b48bdSThierry Reding return !(ret == 1); 100330b48bdSThierry Reding } 101330b48bdSThierry Reding 102330b48bdSThierry Reding static int ps8622_send_config(struct ps8622_bridge *ps8622) 103330b48bdSThierry Reding { 104330b48bdSThierry Reding struct i2c_client *cl = ps8622->client; 105330b48bdSThierry Reding int err = 0; 106330b48bdSThierry Reding 107330b48bdSThierry Reding /* HPD low */ 108330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xa1, 0x01); 109330b48bdSThierry Reding if (err) 110330b48bdSThierry Reding goto error; 111330b48bdSThierry Reding 112330b48bdSThierry Reding /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */ 113330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x14, 0x01); 114330b48bdSThierry Reding if (err) 115330b48bdSThierry Reding goto error; 116330b48bdSThierry Reding 117330b48bdSThierry Reding /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */ 118330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xe3, 0x20); 119330b48bdSThierry Reding if (err) 120330b48bdSThierry Reding goto error; 121330b48bdSThierry Reding 122330b48bdSThierry Reding /* [7] RCO SS enable */ 123330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xe2, 0x80); 124330b48bdSThierry Reding if (err) 125330b48bdSThierry Reding goto error; 126330b48bdSThierry Reding 127330b48bdSThierry Reding /* RPHY Setting 128330b48bdSThierry Reding * [3:2] CDR tune wait cycle before measure for fine tune 129330b48bdSThierry Reding * b00: 1us b01: 0.5us b10:2us, b11: 4us 130330b48bdSThierry Reding */ 131330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x8a, 0x0c); 132330b48bdSThierry Reding if (err) 133330b48bdSThierry Reding goto error; 134330b48bdSThierry Reding 135330b48bdSThierry Reding /* [3] RFD always on */ 136330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x89, 0x08); 137330b48bdSThierry Reding if (err) 138330b48bdSThierry Reding goto error; 139330b48bdSThierry Reding 140330b48bdSThierry Reding /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */ 141330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x71, 0x2d); 142330b48bdSThierry Reding if (err) 143330b48bdSThierry Reding goto error; 144330b48bdSThierry Reding 145330b48bdSThierry Reding /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */ 146330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7d, 0x07); 147330b48bdSThierry Reding if (err) 148330b48bdSThierry Reding goto error; 149330b48bdSThierry Reding 150330b48bdSThierry Reding /* [1:0] Fmin=+4bands */ 151330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7b, 0x00); 152330b48bdSThierry Reding if (err) 153330b48bdSThierry Reding goto error; 154330b48bdSThierry Reding 155330b48bdSThierry Reding /* [7:5] DCO_FTRNG=+-40% */ 156330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x7a, 0xfd); 157330b48bdSThierry Reding if (err) 158330b48bdSThierry Reding goto error; 159330b48bdSThierry Reding 160330b48bdSThierry Reding /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */ 161330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc0, 0x12); 162330b48bdSThierry Reding if (err) 163330b48bdSThierry Reding goto error; 164330b48bdSThierry Reding 165330b48bdSThierry Reding /* Gitune=-37% */ 166330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc1, 0x92); 167330b48bdSThierry Reding if (err) 168330b48bdSThierry Reding goto error; 169330b48bdSThierry Reding 170330b48bdSThierry Reding /* Fbstep=100% */ 171330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0xc2, 0x1c); 172330b48bdSThierry Reding if (err) 173330b48bdSThierry Reding goto error; 174330b48bdSThierry Reding 175330b48bdSThierry Reding /* [7] LOS signal disable */ 176330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x32, 0x80); 177330b48bdSThierry Reding if (err) 178330b48bdSThierry Reding goto error; 179330b48bdSThierry Reding 180330b48bdSThierry Reding /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */ 181330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x00, 0xb0); 182330b48bdSThierry Reding if (err) 183330b48bdSThierry Reding goto error; 184330b48bdSThierry Reding 185330b48bdSThierry Reding /* [7:6] Right-bar GPIO output strength is 8mA */ 186330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x15, 0x40); 187330b48bdSThierry Reding if (err) 188330b48bdSThierry Reding goto error; 189330b48bdSThierry Reding 190330b48bdSThierry Reding /* EQ Training State Machine Setting, RCO calibration start */ 191330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x54, 0x10); 192330b48bdSThierry Reding if (err) 193330b48bdSThierry Reding goto error; 194330b48bdSThierry Reding 195330b48bdSThierry Reding /* Logic, needs more than 10 I2C command */ 196330b48bdSThierry Reding /* [4:0] MAX_LANE_COUNT set to max supported lanes */ 197330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count); 198330b48bdSThierry Reding if (err) 199330b48bdSThierry Reding goto error; 200330b48bdSThierry Reding 201330b48bdSThierry Reding /* [4:0] LANE_COUNT_SET set to chosen lane count */ 202330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count); 203330b48bdSThierry Reding if (err) 204330b48bdSThierry Reding goto error; 205330b48bdSThierry Reding 206330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x52, 0x20); 207330b48bdSThierry Reding if (err) 208330b48bdSThierry Reding goto error; 209330b48bdSThierry Reding 210330b48bdSThierry Reding /* HPD CP toggle enable */ 211330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0xf1, 0x03); 212330b48bdSThierry Reding if (err) 213330b48bdSThierry Reding goto error; 214330b48bdSThierry Reding 215330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x62, 0x41); 216330b48bdSThierry Reding if (err) 217330b48bdSThierry Reding goto error; 218330b48bdSThierry Reding 219330b48bdSThierry Reding /* Counter number, add 1ms counter delay */ 220330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0xf6, 0x01); 221330b48bdSThierry Reding if (err) 222330b48bdSThierry Reding goto error; 223330b48bdSThierry Reding 224330b48bdSThierry Reding /* [6]PWM function control by DPCD0040f[7], default is PWM block */ 225330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x77, 0x06); 226330b48bdSThierry Reding if (err) 227330b48bdSThierry Reding goto error; 228330b48bdSThierry Reding 229330b48bdSThierry Reding /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */ 230330b48bdSThierry Reding err = ps8622_set(cl, 0x00, 0x4c, 0x04); 231330b48bdSThierry Reding if (err) 232330b48bdSThierry Reding goto error; 233330b48bdSThierry Reding 234330b48bdSThierry Reding /* DPCD00400='h00, Parade OUI ='h001cf8 */ 235330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc0, 0x00); 236330b48bdSThierry Reding if (err) 237330b48bdSThierry Reding goto error; 238330b48bdSThierry Reding 239330b48bdSThierry Reding /* DPCD00401='h1c */ 240330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc1, 0x1c); 241330b48bdSThierry Reding if (err) 242330b48bdSThierry Reding goto error; 243330b48bdSThierry Reding 244330b48bdSThierry Reding /* DPCD00402='hf8 */ 245330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc2, 0xf8); 246330b48bdSThierry Reding if (err) 247330b48bdSThierry Reding goto error; 248330b48bdSThierry Reding 249330b48bdSThierry Reding /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */ 250330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc3, 0x44); 251330b48bdSThierry Reding if (err) 252330b48bdSThierry Reding goto error; 253330b48bdSThierry Reding 254330b48bdSThierry Reding /* DPCD404 */ 255330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc4, 0x32); 256330b48bdSThierry Reding if (err) 257330b48bdSThierry Reding goto error; 258330b48bdSThierry Reding 259330b48bdSThierry Reding /* DPCD405 */ 260330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc5, 0x53); 261330b48bdSThierry Reding if (err) 262330b48bdSThierry Reding goto error; 263330b48bdSThierry Reding 264330b48bdSThierry Reding /* DPCD406 */ 265330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc6, 0x4c); 266330b48bdSThierry Reding if (err) 267330b48bdSThierry Reding goto error; 268330b48bdSThierry Reding 269330b48bdSThierry Reding /* DPCD407 */ 270330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc7, 0x56); 271330b48bdSThierry Reding if (err) 272330b48bdSThierry Reding goto error; 273330b48bdSThierry Reding 274330b48bdSThierry Reding /* DPCD408 */ 275330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xc8, 0x35); 276330b48bdSThierry Reding if (err) 277330b48bdSThierry Reding goto error; 278330b48bdSThierry Reding 279330b48bdSThierry Reding /* DPCD40A, Initial Code major revision '01' */ 280330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xca, 0x01); 281330b48bdSThierry Reding if (err) 282330b48bdSThierry Reding goto error; 283330b48bdSThierry Reding 284330b48bdSThierry Reding /* DPCD40B, Initial Code minor revision '05' */ 285330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xcb, 0x05); 286330b48bdSThierry Reding if (err) 287330b48bdSThierry Reding goto error; 288330b48bdSThierry Reding 289330b48bdSThierry Reding 290330b48bdSThierry Reding if (ps8622->bl) { 291330b48bdSThierry Reding /* DPCD720, internal PWM */ 292330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa5, 0xa0); 293330b48bdSThierry Reding if (err) 294330b48bdSThierry Reding goto error; 295330b48bdSThierry Reding 296330b48bdSThierry Reding /* FFh for 100% brightness, 0h for 0% brightness */ 297330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa7, 298330b48bdSThierry Reding ps8622->bl->props.brightness); 299330b48bdSThierry Reding if (err) 300330b48bdSThierry Reding goto error; 301330b48bdSThierry Reding } else { 302330b48bdSThierry Reding /* DPCD720, external PWM */ 303330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xa5, 0x80); 304330b48bdSThierry Reding if (err) 305330b48bdSThierry Reding goto error; 306330b48bdSThierry Reding } 307330b48bdSThierry Reding 308330b48bdSThierry Reding /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */ 309330b48bdSThierry Reding err = ps8622_set(cl, 0x01, 0xcc, 0x13); 310330b48bdSThierry Reding if (err) 311330b48bdSThierry Reding goto error; 312330b48bdSThierry Reding 313330b48bdSThierry Reding /* Enable SSC set by register */ 314330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xb1, 0x20); 315330b48bdSThierry Reding if (err) 316330b48bdSThierry Reding goto error; 317330b48bdSThierry Reding 318330b48bdSThierry Reding /* Set SSC enabled and +/-1% central spreading */ 319330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x10, 0x16); 320330b48bdSThierry Reding if (err) 321330b48bdSThierry Reding goto error; 322330b48bdSThierry Reding 323330b48bdSThierry Reding /* Logic end */ 324330b48bdSThierry Reding /* MPU Clock source: LC => RCO */ 325330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x59, 0x60); 326330b48bdSThierry Reding if (err) 327330b48bdSThierry Reding goto error; 328330b48bdSThierry Reding 329330b48bdSThierry Reding /* LC -> RCO */ 330330b48bdSThierry Reding err = ps8622_set(cl, 0x04, 0x54, 0x14); 331330b48bdSThierry Reding if (err) 332330b48bdSThierry Reding goto error; 333330b48bdSThierry Reding 334330b48bdSThierry Reding /* HPD high */ 335330b48bdSThierry Reding err = ps8622_set(cl, 0x02, 0xa1, 0x91); 336330b48bdSThierry Reding 337330b48bdSThierry Reding error: 338330b48bdSThierry Reding return err ? -EIO : 0; 339330b48bdSThierry Reding } 340330b48bdSThierry Reding 341330b48bdSThierry Reding static int ps8622_backlight_update(struct backlight_device *bl) 342330b48bdSThierry Reding { 343330b48bdSThierry Reding struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev); 344330b48bdSThierry Reding int ret, brightness = bl->props.brightness; 345330b48bdSThierry Reding 346330b48bdSThierry Reding if (bl->props.power != FB_BLANK_UNBLANK || 347330b48bdSThierry Reding bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) 348330b48bdSThierry Reding brightness = 0; 349330b48bdSThierry Reding 350330b48bdSThierry Reding if (!ps8622->enabled) 351330b48bdSThierry Reding return -EINVAL; 352330b48bdSThierry Reding 353330b48bdSThierry Reding ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness); 354330b48bdSThierry Reding 355330b48bdSThierry Reding return ret; 356330b48bdSThierry Reding } 357330b48bdSThierry Reding 358330b48bdSThierry Reding static const struct backlight_ops ps8622_backlight_ops = { 359330b48bdSThierry Reding .update_status = ps8622_backlight_update, 360330b48bdSThierry Reding }; 361330b48bdSThierry Reding 362330b48bdSThierry Reding static void ps8622_pre_enable(struct drm_bridge *bridge) 363330b48bdSThierry Reding { 364330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 365330b48bdSThierry Reding int ret; 366330b48bdSThierry Reding 367330b48bdSThierry Reding if (ps8622->enabled) 368330b48bdSThierry Reding return; 369330b48bdSThierry Reding 370330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 0); 371330b48bdSThierry Reding 372330b48bdSThierry Reding if (ps8622->v12) { 373330b48bdSThierry Reding ret = regulator_enable(ps8622->v12); 374330b48bdSThierry Reding if (ret) 375330b48bdSThierry Reding DRM_ERROR("fails to enable ps8622->v12"); 376330b48bdSThierry Reding } 377330b48bdSThierry Reding 378330b48bdSThierry Reding if (drm_panel_prepare(ps8622->panel)) { 379330b48bdSThierry Reding DRM_ERROR("failed to prepare panel\n"); 380330b48bdSThierry Reding return; 381330b48bdSThierry Reding } 382330b48bdSThierry Reding 383330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_slp, 1); 384330b48bdSThierry Reding 385330b48bdSThierry Reding /* 386330b48bdSThierry Reding * T1 is the range of time that it takes for the power to rise after we 387330b48bdSThierry Reding * enable the lcd/ps8622 fet. T2 is the range of time in which the 388330b48bdSThierry Reding * data sheet specifies we should deassert the reset pin. 389330b48bdSThierry Reding * 390330b48bdSThierry Reding * If it takes T1.max for the power to rise, we need to wait atleast 391330b48bdSThierry Reding * T2.min before deasserting the reset pin. If it takes T1.min for the 392330b48bdSThierry Reding * power to rise, we need to wait at most T2.max before deasserting the 393330b48bdSThierry Reding * reset pin. 394330b48bdSThierry Reding */ 395330b48bdSThierry Reding usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US, 396330b48bdSThierry Reding PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US); 397330b48bdSThierry Reding 398330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 1); 399330b48bdSThierry Reding 400330b48bdSThierry Reding /* wait 20ms after RST high */ 401330b48bdSThierry Reding usleep_range(20000, 30000); 402330b48bdSThierry Reding 403330b48bdSThierry Reding ret = ps8622_send_config(ps8622); 404330b48bdSThierry Reding if (ret) { 405330b48bdSThierry Reding DRM_ERROR("Failed to send config to bridge (%d)\n", ret); 406330b48bdSThierry Reding return; 407330b48bdSThierry Reding } 408330b48bdSThierry Reding 409330b48bdSThierry Reding ps8622->enabled = true; 410330b48bdSThierry Reding } 411330b48bdSThierry Reding 412330b48bdSThierry Reding static void ps8622_enable(struct drm_bridge *bridge) 413330b48bdSThierry Reding { 414330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 415330b48bdSThierry Reding 416330b48bdSThierry Reding if (drm_panel_enable(ps8622->panel)) { 417330b48bdSThierry Reding DRM_ERROR("failed to enable panel\n"); 418330b48bdSThierry Reding return; 419330b48bdSThierry Reding } 420330b48bdSThierry Reding } 421330b48bdSThierry Reding 422330b48bdSThierry Reding static void ps8622_disable(struct drm_bridge *bridge) 423330b48bdSThierry Reding { 424330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 425330b48bdSThierry Reding 426330b48bdSThierry Reding if (drm_panel_disable(ps8622->panel)) { 427330b48bdSThierry Reding DRM_ERROR("failed to disable panel\n"); 428330b48bdSThierry Reding return; 429330b48bdSThierry Reding } 430330b48bdSThierry Reding msleep(PS8622_PWMO_END_T12_MS); 431330b48bdSThierry Reding } 432330b48bdSThierry Reding 433330b48bdSThierry Reding static void ps8622_post_disable(struct drm_bridge *bridge) 434330b48bdSThierry Reding { 435330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 436330b48bdSThierry Reding 437330b48bdSThierry Reding if (!ps8622->enabled) 438330b48bdSThierry Reding return; 439330b48bdSThierry Reding 440330b48bdSThierry Reding ps8622->enabled = false; 441330b48bdSThierry Reding 442330b48bdSThierry Reding /* 443330b48bdSThierry Reding * This doesn't matter if the regulators are turned off, but something 444330b48bdSThierry Reding * else might keep them on. In that case, we want to assert the slp gpio 445330b48bdSThierry Reding * to lower power. 446330b48bdSThierry Reding */ 447330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_slp, 0); 448330b48bdSThierry Reding 449330b48bdSThierry Reding if (drm_panel_unprepare(ps8622->panel)) { 450330b48bdSThierry Reding DRM_ERROR("failed to unprepare panel\n"); 451330b48bdSThierry Reding return; 452330b48bdSThierry Reding } 453330b48bdSThierry Reding 454330b48bdSThierry Reding if (ps8622->v12) 455330b48bdSThierry Reding regulator_disable(ps8622->v12); 456330b48bdSThierry Reding 457330b48bdSThierry Reding /* 458330b48bdSThierry Reding * Sleep for at least the amount of time that it takes the power rail to 459330b48bdSThierry Reding * fall to prevent asserting the rst gpio from doing anything. 460330b48bdSThierry Reding */ 461330b48bdSThierry Reding usleep_range(PS8622_POWER_FALL_T16_MAX_US, 462330b48bdSThierry Reding 2 * PS8622_POWER_FALL_T16_MAX_US); 463330b48bdSThierry Reding gpiod_set_value(ps8622->gpio_rst, 0); 464330b48bdSThierry Reding 465330b48bdSThierry Reding msleep(PS8622_POWER_OFF_T17_MS); 466330b48bdSThierry Reding } 467330b48bdSThierry Reding 468330b48bdSThierry Reding static int ps8622_get_modes(struct drm_connector *connector) 469330b48bdSThierry Reding { 470330b48bdSThierry Reding struct ps8622_bridge *ps8622; 471330b48bdSThierry Reding 472330b48bdSThierry Reding ps8622 = connector_to_ps8622(connector); 473330b48bdSThierry Reding 474330b48bdSThierry Reding return drm_panel_get_modes(ps8622->panel); 475330b48bdSThierry Reding } 476330b48bdSThierry Reding 477330b48bdSThierry Reding static struct drm_encoder *ps8622_best_encoder(struct drm_connector *connector) 478330b48bdSThierry Reding { 479330b48bdSThierry Reding struct ps8622_bridge *ps8622; 480330b48bdSThierry Reding 481330b48bdSThierry Reding ps8622 = connector_to_ps8622(connector); 482330b48bdSThierry Reding 483330b48bdSThierry Reding return ps8622->bridge.encoder; 484330b48bdSThierry Reding } 485330b48bdSThierry Reding 486330b48bdSThierry Reding static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = { 487330b48bdSThierry Reding .get_modes = ps8622_get_modes, 488330b48bdSThierry Reding .best_encoder = ps8622_best_encoder, 489330b48bdSThierry Reding }; 490330b48bdSThierry Reding 491330b48bdSThierry Reding static enum drm_connector_status ps8622_detect(struct drm_connector *connector, 492330b48bdSThierry Reding bool force) 493330b48bdSThierry Reding { 494330b48bdSThierry Reding return connector_status_connected; 495330b48bdSThierry Reding } 496330b48bdSThierry Reding 497330b48bdSThierry Reding static void ps8622_connector_destroy(struct drm_connector *connector) 498330b48bdSThierry Reding { 499330b48bdSThierry Reding drm_connector_cleanup(connector); 500330b48bdSThierry Reding } 501330b48bdSThierry Reding 502330b48bdSThierry Reding static const struct drm_connector_funcs ps8622_connector_funcs = { 503330b48bdSThierry Reding .dpms = drm_atomic_helper_connector_dpms, 504330b48bdSThierry Reding .fill_modes = drm_helper_probe_single_connector_modes, 505330b48bdSThierry Reding .detect = ps8622_detect, 506330b48bdSThierry Reding .destroy = ps8622_connector_destroy, 507330b48bdSThierry Reding .reset = drm_atomic_helper_connector_reset, 508330b48bdSThierry Reding .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 509330b48bdSThierry Reding .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 510330b48bdSThierry Reding }; 511330b48bdSThierry Reding 512330b48bdSThierry Reding static int ps8622_attach(struct drm_bridge *bridge) 513330b48bdSThierry Reding { 514330b48bdSThierry Reding struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge); 515330b48bdSThierry Reding int ret; 516330b48bdSThierry Reding 517330b48bdSThierry Reding if (!bridge->encoder) { 518330b48bdSThierry Reding DRM_ERROR("Parent encoder object not found"); 519330b48bdSThierry Reding return -ENODEV; 520330b48bdSThierry Reding } 521330b48bdSThierry Reding 522330b48bdSThierry Reding ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD; 523330b48bdSThierry Reding ret = drm_connector_init(bridge->dev, &ps8622->connector, 524330b48bdSThierry Reding &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS); 525330b48bdSThierry Reding if (ret) { 526330b48bdSThierry Reding DRM_ERROR("Failed to initialize connector with drm\n"); 527330b48bdSThierry Reding return ret; 528330b48bdSThierry Reding } 529330b48bdSThierry Reding drm_connector_helper_add(&ps8622->connector, 530330b48bdSThierry Reding &ps8622_connector_helper_funcs); 531330b48bdSThierry Reding drm_connector_register(&ps8622->connector); 532330b48bdSThierry Reding drm_mode_connector_attach_encoder(&ps8622->connector, 533330b48bdSThierry Reding bridge->encoder); 534330b48bdSThierry Reding 535330b48bdSThierry Reding if (ps8622->panel) 536330b48bdSThierry Reding drm_panel_attach(ps8622->panel, &ps8622->connector); 537330b48bdSThierry Reding 538330b48bdSThierry Reding drm_helper_hpd_irq_event(ps8622->connector.dev); 539330b48bdSThierry Reding 540330b48bdSThierry Reding return ret; 541330b48bdSThierry Reding } 542330b48bdSThierry Reding 543330b48bdSThierry Reding static const struct drm_bridge_funcs ps8622_bridge_funcs = { 544330b48bdSThierry Reding .pre_enable = ps8622_pre_enable, 545330b48bdSThierry Reding .enable = ps8622_enable, 546330b48bdSThierry Reding .disable = ps8622_disable, 547330b48bdSThierry Reding .post_disable = ps8622_post_disable, 548330b48bdSThierry Reding .attach = ps8622_attach, 549330b48bdSThierry Reding }; 550330b48bdSThierry Reding 551330b48bdSThierry Reding static const struct of_device_id ps8622_devices[] = { 552330b48bdSThierry Reding {.compatible = "parade,ps8622",}, 553330b48bdSThierry Reding {.compatible = "parade,ps8625",}, 554330b48bdSThierry Reding {} 555330b48bdSThierry Reding }; 556330b48bdSThierry Reding MODULE_DEVICE_TABLE(of, ps8622_devices); 557330b48bdSThierry Reding 558330b48bdSThierry Reding static int ps8622_probe(struct i2c_client *client, 559330b48bdSThierry Reding const struct i2c_device_id *id) 560330b48bdSThierry Reding { 561330b48bdSThierry Reding struct device *dev = &client->dev; 562330b48bdSThierry Reding struct device_node *endpoint, *panel_node; 563330b48bdSThierry Reding struct ps8622_bridge *ps8622; 564330b48bdSThierry Reding int ret; 565330b48bdSThierry Reding 566330b48bdSThierry Reding ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL); 567330b48bdSThierry Reding if (!ps8622) 568330b48bdSThierry Reding return -ENOMEM; 569330b48bdSThierry Reding 570330b48bdSThierry Reding endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); 571330b48bdSThierry Reding if (endpoint) { 572330b48bdSThierry Reding panel_node = of_graph_get_remote_port_parent(endpoint); 573330b48bdSThierry Reding if (panel_node) { 574330b48bdSThierry Reding ps8622->panel = of_drm_find_panel(panel_node); 575330b48bdSThierry Reding of_node_put(panel_node); 576330b48bdSThierry Reding if (!ps8622->panel) 577330b48bdSThierry Reding return -EPROBE_DEFER; 578330b48bdSThierry Reding } 579330b48bdSThierry Reding } 580330b48bdSThierry Reding 581330b48bdSThierry Reding ps8622->client = client; 582330b48bdSThierry Reding 583330b48bdSThierry Reding ps8622->v12 = devm_regulator_get(dev, "vdd12"); 584330b48bdSThierry Reding if (IS_ERR(ps8622->v12)) { 585330b48bdSThierry Reding dev_info(dev, "no 1.2v regulator found for PS8622\n"); 586330b48bdSThierry Reding ps8622->v12 = NULL; 587330b48bdSThierry Reding } 588330b48bdSThierry Reding 589330b48bdSThierry Reding ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH); 590330b48bdSThierry Reding if (IS_ERR(ps8622->gpio_slp)) { 591330b48bdSThierry Reding ret = PTR_ERR(ps8622->gpio_slp); 592330b48bdSThierry Reding dev_err(dev, "cannot get gpio_slp %d\n", ret); 593330b48bdSThierry Reding return ret; 594330b48bdSThierry Reding } 595330b48bdSThierry Reding 596330b48bdSThierry Reding /* 597330b48bdSThierry Reding * Assert the reset pin high to avoid the bridge being 598330b48bdSThierry Reding * initialized prematurely 599330b48bdSThierry Reding */ 600330b48bdSThierry Reding ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); 601330b48bdSThierry Reding if (IS_ERR(ps8622->gpio_rst)) { 602330b48bdSThierry Reding ret = PTR_ERR(ps8622->gpio_rst); 603330b48bdSThierry Reding dev_err(dev, "cannot get gpio_rst %d\n", ret); 604330b48bdSThierry Reding return ret; 605330b48bdSThierry Reding } 606330b48bdSThierry Reding 607330b48bdSThierry Reding ps8622->max_lane_count = id->driver_data; 608330b48bdSThierry Reding 609330b48bdSThierry Reding if (of_property_read_u32(dev->of_node, "lane-count", 610330b48bdSThierry Reding &ps8622->lane_count)) { 611330b48bdSThierry Reding ps8622->lane_count = ps8622->max_lane_count; 612330b48bdSThierry Reding } else if (ps8622->lane_count > ps8622->max_lane_count) { 613330b48bdSThierry Reding dev_info(dev, "lane-count property is too high," 614330b48bdSThierry Reding "using max_lane_count\n"); 615330b48bdSThierry Reding ps8622->lane_count = ps8622->max_lane_count; 616330b48bdSThierry Reding } 617330b48bdSThierry Reding 618330b48bdSThierry Reding if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) { 619330b48bdSThierry Reding ps8622->bl = backlight_device_register("ps8622-backlight", 620330b48bdSThierry Reding dev, ps8622, &ps8622_backlight_ops, 621330b48bdSThierry Reding NULL); 622330b48bdSThierry Reding if (IS_ERR(ps8622->bl)) { 623330b48bdSThierry Reding DRM_ERROR("failed to register backlight\n"); 624330b48bdSThierry Reding ret = PTR_ERR(ps8622->bl); 625330b48bdSThierry Reding ps8622->bl = NULL; 626330b48bdSThierry Reding return ret; 627330b48bdSThierry Reding } 628330b48bdSThierry Reding ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS; 629330b48bdSThierry Reding ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS; 630330b48bdSThierry Reding } 631330b48bdSThierry Reding 632330b48bdSThierry Reding ps8622->bridge.funcs = &ps8622_bridge_funcs; 633330b48bdSThierry Reding ps8622->bridge.of_node = dev->of_node; 634330b48bdSThierry Reding ret = drm_bridge_add(&ps8622->bridge); 635330b48bdSThierry Reding if (ret) { 636330b48bdSThierry Reding DRM_ERROR("Failed to add bridge\n"); 637330b48bdSThierry Reding return ret; 638330b48bdSThierry Reding } 639330b48bdSThierry Reding 640330b48bdSThierry Reding i2c_set_clientdata(client, ps8622); 641330b48bdSThierry Reding 642330b48bdSThierry Reding return 0; 643330b48bdSThierry Reding } 644330b48bdSThierry Reding 645330b48bdSThierry Reding static int ps8622_remove(struct i2c_client *client) 646330b48bdSThierry Reding { 647330b48bdSThierry Reding struct ps8622_bridge *ps8622 = i2c_get_clientdata(client); 648330b48bdSThierry Reding 649330b48bdSThierry Reding if (ps8622->bl) 650330b48bdSThierry Reding backlight_device_unregister(ps8622->bl); 651330b48bdSThierry Reding 652330b48bdSThierry Reding drm_bridge_remove(&ps8622->bridge); 653330b48bdSThierry Reding 654330b48bdSThierry Reding return 0; 655330b48bdSThierry Reding } 656330b48bdSThierry Reding 657330b48bdSThierry Reding static const struct i2c_device_id ps8622_i2c_table[] = { 658330b48bdSThierry Reding /* Device type, max_lane_count */ 659330b48bdSThierry Reding {"ps8622", 1}, 660330b48bdSThierry Reding {"ps8625", 2}, 661330b48bdSThierry Reding {}, 662330b48bdSThierry Reding }; 663330b48bdSThierry Reding MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table); 664330b48bdSThierry Reding 665330b48bdSThierry Reding static struct i2c_driver ps8622_driver = { 666330b48bdSThierry Reding .id_table = ps8622_i2c_table, 667330b48bdSThierry Reding .probe = ps8622_probe, 668330b48bdSThierry Reding .remove = ps8622_remove, 669330b48bdSThierry Reding .driver = { 670330b48bdSThierry Reding .name = "ps8622", 671330b48bdSThierry Reding .owner = THIS_MODULE, 672330b48bdSThierry Reding .of_match_table = ps8622_devices, 673330b48bdSThierry Reding }, 674330b48bdSThierry Reding }; 675330b48bdSThierry Reding module_i2c_driver(ps8622_driver); 676330b48bdSThierry Reding 677330b48bdSThierry Reding MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>"); 678330b48bdSThierry Reding MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver"); 679330b48bdSThierry Reding MODULE_LICENSE("GPL v2"); 680