553 lines
13 KiB
C
553 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Parade PS8622 eDP/LVDS bridge driver
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*
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* Copyright (C) 2014 Google, Inc.
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*/
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#include <linux/backlight.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/pm.h>
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#include <linux/regulator/consumer.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_of.h>
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#include <drm/drm_panel.h>
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#include <drm/drm_print.h>
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#include <drm/drm_probe_helper.h>
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/* Brightness scale on the Parade chip */
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#define PS8622_MAX_BRIGHTNESS 0xff
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/* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */
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#define PS8622_POWER_RISE_T1_MIN_US 10
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#define PS8622_POWER_RISE_T1_MAX_US 10000
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#define PS8622_RST_HIGH_T2_MIN_US 3000
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#define PS8622_RST_HIGH_T2_MAX_US 30000
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#define PS8622_PWMO_END_T12_MS 200
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#define PS8622_POWER_FALL_T16_MAX_US 10000
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#define PS8622_POWER_OFF_T17_MS 500
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#if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \
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(PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US))
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#error "T2.min + T1.max must be less than T2.max + T1.min"
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#endif
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struct ps8622_bridge {
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struct i2c_client *client;
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struct drm_bridge bridge;
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struct drm_bridge *panel_bridge;
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struct regulator *v12;
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struct backlight_device *bl;
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struct gpio_desc *gpio_slp;
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struct gpio_desc *gpio_rst;
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u32 max_lane_count;
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u32 lane_count;
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bool enabled;
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};
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static inline struct ps8622_bridge *
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bridge_to_ps8622(struct drm_bridge *bridge)
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{
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return container_of(bridge, struct ps8622_bridge, bridge);
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}
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static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val)
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{
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int ret;
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struct i2c_adapter *adap = client->adapter;
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struct i2c_msg msg;
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u8 data[] = {reg, val};
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msg.addr = client->addr + page;
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msg.flags = 0;
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msg.len = sizeof(data);
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msg.buf = data;
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ret = i2c_transfer(adap, &msg, 1);
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if (ret != 1)
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pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n",
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client->addr + page, reg, val, ret);
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return !(ret == 1);
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}
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static int ps8622_send_config(struct ps8622_bridge *ps8622)
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{
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struct i2c_client *cl = ps8622->client;
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int err = 0;
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/* HPD low */
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err = ps8622_set(cl, 0x02, 0xa1, 0x01);
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if (err)
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goto error;
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/* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */
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err = ps8622_set(cl, 0x04, 0x14, 0x01);
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if (err)
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goto error;
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/* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */
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err = ps8622_set(cl, 0x04, 0xe3, 0x20);
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if (err)
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goto error;
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/* [7] RCO SS enable */
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err = ps8622_set(cl, 0x04, 0xe2, 0x80);
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if (err)
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goto error;
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/* RPHY Setting
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* [3:2] CDR tune wait cycle before measure for fine tune
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* b00: 1us b01: 0.5us b10:2us, b11: 4us
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*/
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err = ps8622_set(cl, 0x04, 0x8a, 0x0c);
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if (err)
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goto error;
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/* [3] RFD always on */
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err = ps8622_set(cl, 0x04, 0x89, 0x08);
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if (err)
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goto error;
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/* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */
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err = ps8622_set(cl, 0x04, 0x71, 0x2d);
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if (err)
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goto error;
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/* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */
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err = ps8622_set(cl, 0x04, 0x7d, 0x07);
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if (err)
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goto error;
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/* [1:0] Fmin=+4bands */
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err = ps8622_set(cl, 0x04, 0x7b, 0x00);
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if (err)
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goto error;
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/* [7:5] DCO_FTRNG=+-40% */
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err = ps8622_set(cl, 0x04, 0x7a, 0xfd);
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if (err)
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goto error;
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/* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */
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err = ps8622_set(cl, 0x04, 0xc0, 0x12);
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if (err)
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goto error;
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/* Gitune=-37% */
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err = ps8622_set(cl, 0x04, 0xc1, 0x92);
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if (err)
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goto error;
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/* Fbstep=100% */
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err = ps8622_set(cl, 0x04, 0xc2, 0x1c);
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if (err)
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goto error;
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/* [7] LOS signal disable */
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err = ps8622_set(cl, 0x04, 0x32, 0x80);
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if (err)
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goto error;
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/* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */
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err = ps8622_set(cl, 0x04, 0x00, 0xb0);
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if (err)
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goto error;
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/* [7:6] Right-bar GPIO output strength is 8mA */
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err = ps8622_set(cl, 0x04, 0x15, 0x40);
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if (err)
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goto error;
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/* EQ Training State Machine Setting, RCO calibration start */
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err = ps8622_set(cl, 0x04, 0x54, 0x10);
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if (err)
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goto error;
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/* Logic, needs more than 10 I2C command */
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/* [4:0] MAX_LANE_COUNT set to max supported lanes */
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err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count);
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if (err)
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goto error;
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/* [4:0] LANE_COUNT_SET set to chosen lane count */
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err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count);
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if (err)
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goto error;
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err = ps8622_set(cl, 0x00, 0x52, 0x20);
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if (err)
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goto error;
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/* HPD CP toggle enable */
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err = ps8622_set(cl, 0x00, 0xf1, 0x03);
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if (err)
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goto error;
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err = ps8622_set(cl, 0x00, 0x62, 0x41);
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if (err)
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goto error;
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/* Counter number, add 1ms counter delay */
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err = ps8622_set(cl, 0x00, 0xf6, 0x01);
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if (err)
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goto error;
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/* [6]PWM function control by DPCD0040f[7], default is PWM block */
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err = ps8622_set(cl, 0x00, 0x77, 0x06);
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if (err)
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goto error;
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/* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */
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err = ps8622_set(cl, 0x00, 0x4c, 0x04);
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if (err)
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goto error;
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/* DPCD00400='h00, Parade OUI ='h001cf8 */
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err = ps8622_set(cl, 0x01, 0xc0, 0x00);
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if (err)
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goto error;
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/* DPCD00401='h1c */
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err = ps8622_set(cl, 0x01, 0xc1, 0x1c);
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if (err)
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goto error;
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/* DPCD00402='hf8 */
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err = ps8622_set(cl, 0x01, 0xc2, 0xf8);
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if (err)
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goto error;
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/* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */
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err = ps8622_set(cl, 0x01, 0xc3, 0x44);
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if (err)
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goto error;
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/* DPCD404 */
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err = ps8622_set(cl, 0x01, 0xc4, 0x32);
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if (err)
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goto error;
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/* DPCD405 */
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err = ps8622_set(cl, 0x01, 0xc5, 0x53);
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if (err)
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goto error;
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/* DPCD406 */
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err = ps8622_set(cl, 0x01, 0xc6, 0x4c);
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if (err)
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goto error;
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/* DPCD407 */
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err = ps8622_set(cl, 0x01, 0xc7, 0x56);
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if (err)
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goto error;
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/* DPCD408 */
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err = ps8622_set(cl, 0x01, 0xc8, 0x35);
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if (err)
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goto error;
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/* DPCD40A, Initial Code major revision '01' */
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err = ps8622_set(cl, 0x01, 0xca, 0x01);
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if (err)
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goto error;
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/* DPCD40B, Initial Code minor revision '05' */
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err = ps8622_set(cl, 0x01, 0xcb, 0x05);
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if (err)
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goto error;
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if (ps8622->bl) {
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/* DPCD720, internal PWM */
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err = ps8622_set(cl, 0x01, 0xa5, 0xa0);
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if (err)
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goto error;
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/* FFh for 100% brightness, 0h for 0% brightness */
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err = ps8622_set(cl, 0x01, 0xa7,
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ps8622->bl->props.brightness);
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if (err)
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goto error;
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} else {
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/* DPCD720, external PWM */
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err = ps8622_set(cl, 0x01, 0xa5, 0x80);
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if (err)
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goto error;
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}
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/* Set LVDS output as 6bit-VESA mapping, single LVDS channel */
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err = ps8622_set(cl, 0x01, 0xcc, 0x13);
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if (err)
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goto error;
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/* Enable SSC set by register */
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err = ps8622_set(cl, 0x02, 0xb1, 0x20);
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if (err)
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goto error;
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/* Set SSC enabled and +/-1% central spreading */
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err = ps8622_set(cl, 0x04, 0x10, 0x16);
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if (err)
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goto error;
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/* Logic end */
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/* MPU Clock source: LC => RCO */
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err = ps8622_set(cl, 0x04, 0x59, 0x60);
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if (err)
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goto error;
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/* LC -> RCO */
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err = ps8622_set(cl, 0x04, 0x54, 0x14);
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if (err)
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goto error;
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/* HPD high */
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err = ps8622_set(cl, 0x02, 0xa1, 0x91);
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error:
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return err ? -EIO : 0;
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}
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static int ps8622_backlight_update(struct backlight_device *bl)
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{
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struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev);
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int ret, brightness = backlight_get_brightness(bl);
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if (!ps8622->enabled)
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return -EINVAL;
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ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness);
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return ret;
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}
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static const struct backlight_ops ps8622_backlight_ops = {
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.update_status = ps8622_backlight_update,
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};
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static void ps8622_pre_enable(struct drm_bridge *bridge)
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{
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struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
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int ret;
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if (ps8622->enabled)
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return;
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gpiod_set_value(ps8622->gpio_rst, 0);
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if (ps8622->v12) {
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ret = regulator_enable(ps8622->v12);
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if (ret)
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DRM_ERROR("fails to enable ps8622->v12");
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}
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gpiod_set_value(ps8622->gpio_slp, 1);
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/*
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* T1 is the range of time that it takes for the power to rise after we
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* enable the lcd/ps8622 fet. T2 is the range of time in which the
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* data sheet specifies we should deassert the reset pin.
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*
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* If it takes T1.max for the power to rise, we need to wait atleast
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* T2.min before deasserting the reset pin. If it takes T1.min for the
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* power to rise, we need to wait at most T2.max before deasserting the
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* reset pin.
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*/
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usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US,
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PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US);
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gpiod_set_value(ps8622->gpio_rst, 1);
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/* wait 20ms after RST high */
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usleep_range(20000, 30000);
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ret = ps8622_send_config(ps8622);
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if (ret) {
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DRM_ERROR("Failed to send config to bridge (%d)\n", ret);
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return;
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}
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ps8622->enabled = true;
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}
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static void ps8622_disable(struct drm_bridge *bridge)
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{
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/* Delay after panel is disabled */
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msleep(PS8622_PWMO_END_T12_MS);
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}
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static void ps8622_post_disable(struct drm_bridge *bridge)
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{
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struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
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if (!ps8622->enabled)
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return;
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ps8622->enabled = false;
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/*
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* This doesn't matter if the regulators are turned off, but something
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* else might keep them on. In that case, we want to assert the slp gpio
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* to lower power.
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*/
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gpiod_set_value(ps8622->gpio_slp, 0);
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if (ps8622->v12)
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regulator_disable(ps8622->v12);
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/*
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* Sleep for at least the amount of time that it takes the power rail to
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* fall to prevent asserting the rst gpio from doing anything.
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*/
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usleep_range(PS8622_POWER_FALL_T16_MAX_US,
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2 * PS8622_POWER_FALL_T16_MAX_US);
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gpiod_set_value(ps8622->gpio_rst, 0);
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msleep(PS8622_POWER_OFF_T17_MS);
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}
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static int ps8622_attach(struct drm_bridge *bridge,
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enum drm_bridge_attach_flags flags)
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{
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struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
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return drm_bridge_attach(ps8622->bridge.encoder, ps8622->panel_bridge,
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&ps8622->bridge, flags);
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}
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static const struct drm_bridge_funcs ps8622_bridge_funcs = {
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.pre_enable = ps8622_pre_enable,
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.disable = ps8622_disable,
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.post_disable = ps8622_post_disable,
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.attach = ps8622_attach,
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};
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static const struct of_device_id ps8622_devices[] = {
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{.compatible = "parade,ps8622",},
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{.compatible = "parade,ps8625",},
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{}
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};
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MODULE_DEVICE_TABLE(of, ps8622_devices);
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static int ps8622_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct ps8622_bridge *ps8622;
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struct drm_bridge *panel_bridge;
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int ret;
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ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL);
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if (!ps8622)
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return -ENOMEM;
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panel_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, 0);
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if (IS_ERR(panel_bridge))
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return PTR_ERR(panel_bridge);
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ps8622->panel_bridge = panel_bridge;
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ps8622->client = client;
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ps8622->v12 = devm_regulator_get(dev, "vdd12");
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if (IS_ERR(ps8622->v12)) {
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dev_info(dev, "no 1.2v regulator found for PS8622\n");
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ps8622->v12 = NULL;
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}
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ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH);
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if (IS_ERR(ps8622->gpio_slp)) {
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ret = PTR_ERR(ps8622->gpio_slp);
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dev_err(dev, "cannot get gpio_slp %d\n", ret);
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return ret;
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}
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/*
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* Assert the reset pin high to avoid the bridge being
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* initialized prematurely
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*/
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ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(ps8622->gpio_rst)) {
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ret = PTR_ERR(ps8622->gpio_rst);
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dev_err(dev, "cannot get gpio_rst %d\n", ret);
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return ret;
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}
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ps8622->max_lane_count = id->driver_data;
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if (of_property_read_u32(dev->of_node, "lane-count",
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&ps8622->lane_count)) {
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ps8622->lane_count = ps8622->max_lane_count;
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} else if (ps8622->lane_count > ps8622->max_lane_count) {
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dev_info(dev, "lane-count property is too high,"
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"using max_lane_count\n");
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ps8622->lane_count = ps8622->max_lane_count;
|
|
}
|
|
|
|
if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) {
|
|
ps8622->bl = backlight_device_register("ps8622-backlight",
|
|
dev, ps8622, &ps8622_backlight_ops,
|
|
NULL);
|
|
if (IS_ERR(ps8622->bl)) {
|
|
DRM_ERROR("failed to register backlight\n");
|
|
ret = PTR_ERR(ps8622->bl);
|
|
ps8622->bl = NULL;
|
|
return ret;
|
|
}
|
|
ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS;
|
|
ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS;
|
|
}
|
|
|
|
ps8622->bridge.funcs = &ps8622_bridge_funcs;
|
|
ps8622->bridge.type = DRM_MODE_CONNECTOR_LVDS;
|
|
ps8622->bridge.of_node = dev->of_node;
|
|
drm_bridge_add(&ps8622->bridge);
|
|
|
|
i2c_set_clientdata(client, ps8622);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ps8622_remove(struct i2c_client *client)
|
|
{
|
|
struct ps8622_bridge *ps8622 = i2c_get_clientdata(client);
|
|
|
|
backlight_device_unregister(ps8622->bl);
|
|
drm_bridge_remove(&ps8622->bridge);
|
|
}
|
|
|
|
static const struct i2c_device_id ps8622_i2c_table[] = {
|
|
/* Device type, max_lane_count */
|
|
{"ps8622", 1},
|
|
{"ps8625", 2},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table);
|
|
|
|
static struct i2c_driver ps8622_driver = {
|
|
.id_table = ps8622_i2c_table,
|
|
.probe = ps8622_probe,
|
|
.remove = ps8622_remove,
|
|
.driver = {
|
|
.name = "ps8622",
|
|
.of_match_table = ps8622_devices,
|
|
},
|
|
};
|
|
module_i2c_driver(ps8622_driver);
|
|
|
|
MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>");
|
|
MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver");
|
|
MODULE_LICENSE("GPL v2");
|