+++ /dev/null
-/*
- * Parade PS8622 eDP/LVDS bridge driver
- *
- * Copyright (C) 2014 Google, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-#include <linux/backlight.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/fb.h>
-#include <linux/gpio.h>
-#include <linux/i2c.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/of_graph.h>
-#include <linux/pm.h>
-#include <linux/regulator/consumer.h>
-
-#include <drm/drm_panel.h>
-
-#include "drmP.h"
-#include "drm_crtc.h"
-#include "drm_crtc_helper.h"
-
-/* Brightness scale on the Parade chip */
-#define PS8622_MAX_BRIGHTNESS 0xff
-
-/* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */
-#define PS8622_POWER_RISE_T1_MIN_US 10
-#define PS8622_POWER_RISE_T1_MAX_US 10000
-#define PS8622_RST_HIGH_T2_MIN_US 3000
-#define PS8622_RST_HIGH_T2_MAX_US 30000
-#define PS8622_PWMO_END_T12_MS 200
-#define PS8622_POWER_FALL_T16_MAX_US 10000
-#define PS8622_POWER_OFF_T17_MS 500
-
-#if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \
- (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US))
-#error "T2.min + T1.max must be less than T2.max + T1.min"
-#endif
-
-struct ps8622_bridge {
- struct drm_connector connector;
- struct i2c_client *client;
- struct drm_bridge bridge;
- struct drm_panel *panel;
- struct regulator *v12;
- struct backlight_device *bl;
-
- struct gpio_desc *gpio_slp;
- struct gpio_desc *gpio_rst;
-
- u32 max_lane_count;
- u32 lane_count;
-
- bool enabled;
-};
-
-static inline struct ps8622_bridge *
- bridge_to_ps8622(struct drm_bridge *bridge)
-{
- return container_of(bridge, struct ps8622_bridge, bridge);
-}
-
-static inline struct ps8622_bridge *
- connector_to_ps8622(struct drm_connector *connector)
-{
- return container_of(connector, struct ps8622_bridge, connector);
-}
-
-static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val)
-{
- int ret;
- struct i2c_adapter *adap = client->adapter;
- struct i2c_msg msg;
- u8 data[] = {reg, val};
-
- msg.addr = client->addr + page;
- msg.flags = 0;
- msg.len = sizeof(data);
- msg.buf = data;
-
- ret = i2c_transfer(adap, &msg, 1);
- if (ret != 1)
- pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n",
- client->addr + page, reg, val, ret);
- return !(ret == 1);
-}
-
-static int ps8622_send_config(struct ps8622_bridge *ps8622)
-{
- struct i2c_client *cl = ps8622->client;
- int err = 0;
-
- /* HPD low */
- err = ps8622_set(cl, 0x02, 0xa1, 0x01);
- if (err)
- goto error;
-
- /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */
- err = ps8622_set(cl, 0x04, 0x14, 0x01);
- if (err)
- goto error;
-
- /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */
- err = ps8622_set(cl, 0x04, 0xe3, 0x20);
- if (err)
- goto error;
-
- /* [7] RCO SS enable */
- err = ps8622_set(cl, 0x04, 0xe2, 0x80);
- if (err)
- goto error;
-
- /* RPHY Setting
- * [3:2] CDR tune wait cycle before measure for fine tune
- * b00: 1us b01: 0.5us b10:2us, b11: 4us
- */
- err = ps8622_set(cl, 0x04, 0x8a, 0x0c);
- if (err)
- goto error;
-
- /* [3] RFD always on */
- err = ps8622_set(cl, 0x04, 0x89, 0x08);
- if (err)
- goto error;
-
- /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */
- err = ps8622_set(cl, 0x04, 0x71, 0x2d);
- if (err)
- goto error;
-
- /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */
- err = ps8622_set(cl, 0x04, 0x7d, 0x07);
- if (err)
- goto error;
-
- /* [1:0] Fmin=+4bands */
- err = ps8622_set(cl, 0x04, 0x7b, 0x00);
- if (err)
- goto error;
-
- /* [7:5] DCO_FTRNG=+-40% */
- err = ps8622_set(cl, 0x04, 0x7a, 0xfd);
- if (err)
- goto error;
-
- /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */
- err = ps8622_set(cl, 0x04, 0xc0, 0x12);
- if (err)
- goto error;
-
- /* Gitune=-37% */
- err = ps8622_set(cl, 0x04, 0xc1, 0x92);
- if (err)
- goto error;
-
- /* Fbstep=100% */
- err = ps8622_set(cl, 0x04, 0xc2, 0x1c);
- if (err)
- goto error;
-
- /* [7] LOS signal disable */
- err = ps8622_set(cl, 0x04, 0x32, 0x80);
- if (err)
- goto error;
-
- /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */
- err = ps8622_set(cl, 0x04, 0x00, 0xb0);
- if (err)
- goto error;
-
- /* [7:6] Right-bar GPIO output strength is 8mA */
- err = ps8622_set(cl, 0x04, 0x15, 0x40);
- if (err)
- goto error;
-
- /* EQ Training State Machine Setting, RCO calibration start */
- err = ps8622_set(cl, 0x04, 0x54, 0x10);
- if (err)
- goto error;
-
- /* Logic, needs more than 10 I2C command */
- /* [4:0] MAX_LANE_COUNT set to max supported lanes */
- err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count);
- if (err)
- goto error;
-
- /* [4:0] LANE_COUNT_SET set to chosen lane count */
- err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count);
- if (err)
- goto error;
-
- err = ps8622_set(cl, 0x00, 0x52, 0x20);
- if (err)
- goto error;
-
- /* HPD CP toggle enable */
- err = ps8622_set(cl, 0x00, 0xf1, 0x03);
- if (err)
- goto error;
-
- err = ps8622_set(cl, 0x00, 0x62, 0x41);
- if (err)
- goto error;
-
- /* Counter number, add 1ms counter delay */
- err = ps8622_set(cl, 0x00, 0xf6, 0x01);
- if (err)
- goto error;
-
- /* [6]PWM function control by DPCD0040f[7], default is PWM block */
- err = ps8622_set(cl, 0x00, 0x77, 0x06);
- if (err)
- goto error;
-
- /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */
- err = ps8622_set(cl, 0x00, 0x4c, 0x04);
- if (err)
- goto error;
-
- /* DPCD00400='h00, Parade OUI ='h001cf8 */
- err = ps8622_set(cl, 0x01, 0xc0, 0x00);
- if (err)
- goto error;
-
- /* DPCD00401='h1c */
- err = ps8622_set(cl, 0x01, 0xc1, 0x1c);
- if (err)
- goto error;
-
- /* DPCD00402='hf8 */
- err = ps8622_set(cl, 0x01, 0xc2, 0xf8);
- if (err)
- goto error;
-
- /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */
- err = ps8622_set(cl, 0x01, 0xc3, 0x44);
- if (err)
- goto error;
-
- /* DPCD404 */
- err = ps8622_set(cl, 0x01, 0xc4, 0x32);
- if (err)
- goto error;
-
- /* DPCD405 */
- err = ps8622_set(cl, 0x01, 0xc5, 0x53);
- if (err)
- goto error;
-
- /* DPCD406 */
- err = ps8622_set(cl, 0x01, 0xc6, 0x4c);
- if (err)
- goto error;
-
- /* DPCD407 */
- err = ps8622_set(cl, 0x01, 0xc7, 0x56);
- if (err)
- goto error;
-
- /* DPCD408 */
- err = ps8622_set(cl, 0x01, 0xc8, 0x35);
- if (err)
- goto error;
-
- /* DPCD40A, Initial Code major revision '01' */
- err = ps8622_set(cl, 0x01, 0xca, 0x01);
- if (err)
- goto error;
-
- /* DPCD40B, Initial Code minor revision '05' */
- err = ps8622_set(cl, 0x01, 0xcb, 0x05);
- if (err)
- goto error;
-
-
- if (ps8622->bl) {
- /* DPCD720, internal PWM */
- err = ps8622_set(cl, 0x01, 0xa5, 0xa0);
- if (err)
- goto error;
-
- /* FFh for 100% brightness, 0h for 0% brightness */
- err = ps8622_set(cl, 0x01, 0xa7,
- ps8622->bl->props.brightness);
- if (err)
- goto error;
- } else {
- /* DPCD720, external PWM */
- err = ps8622_set(cl, 0x01, 0xa5, 0x80);
- if (err)
- goto error;
- }
-
- /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */
- err = ps8622_set(cl, 0x01, 0xcc, 0x13);
- if (err)
- goto error;
-
- /* Enable SSC set by register */
- err = ps8622_set(cl, 0x02, 0xb1, 0x20);
- if (err)
- goto error;
-
- /* Set SSC enabled and +/-1% central spreading */
- err = ps8622_set(cl, 0x04, 0x10, 0x16);
- if (err)
- goto error;
-
- /* Logic end */
- /* MPU Clock source: LC => RCO */
- err = ps8622_set(cl, 0x04, 0x59, 0x60);
- if (err)
- goto error;
-
- /* LC -> RCO */
- err = ps8622_set(cl, 0x04, 0x54, 0x14);
- if (err)
- goto error;
-
- /* HPD high */
- err = ps8622_set(cl, 0x02, 0xa1, 0x91);
-
-error:
- return err ? -EIO : 0;
-}
-
-static int ps8622_backlight_update(struct backlight_device *bl)
-{
- struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev);
- int ret, brightness = bl->props.brightness;
-
- if (bl->props.power != FB_BLANK_UNBLANK ||
- bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
- brightness = 0;
-
- if (!ps8622->enabled)
- return -EINVAL;
-
- ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness);
-
- return ret;
-}
-
-static const struct backlight_ops ps8622_backlight_ops = {
- .update_status = ps8622_backlight_update,
-};
-
-static void ps8622_pre_enable(struct drm_bridge *bridge)
-{
- struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
- int ret;
-
- if (ps8622->enabled)
- return;
-
- gpiod_set_value(ps8622->gpio_rst, 0);
-
- if (ps8622->v12) {
- ret = regulator_enable(ps8622->v12);
- if (ret)
- DRM_ERROR("fails to enable ps8622->v12");
- }
-
- if (drm_panel_prepare(ps8622->panel)) {
- DRM_ERROR("failed to prepare panel\n");
- return;
- }
-
- gpiod_set_value(ps8622->gpio_slp, 1);
-
- /*
- * T1 is the range of time that it takes for the power to rise after we
- * enable the lcd/ps8622 fet. T2 is the range of time in which the
- * data sheet specifies we should deassert the reset pin.
- *
- * If it takes T1.max for the power to rise, we need to wait atleast
- * T2.min before deasserting the reset pin. If it takes T1.min for the
- * power to rise, we need to wait at most T2.max before deasserting the
- * reset pin.
- */
- usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US,
- PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US);
-
- gpiod_set_value(ps8622->gpio_rst, 1);
-
- /* wait 20ms after RST high */
- usleep_range(20000, 30000);
-
- ret = ps8622_send_config(ps8622);
- if (ret) {
- DRM_ERROR("Failed to send config to bridge (%d)\n", ret);
- return;
- }
-
- ps8622->enabled = true;
-}
-
-static void ps8622_enable(struct drm_bridge *bridge)
-{
- struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
-
- if (drm_panel_enable(ps8622->panel)) {
- DRM_ERROR("failed to enable panel\n");
- return;
- }
-}
-
-static void ps8622_disable(struct drm_bridge *bridge)
-{
- struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
-
- if (drm_panel_disable(ps8622->panel)) {
- DRM_ERROR("failed to disable panel\n");
- return;
- }
- msleep(PS8622_PWMO_END_T12_MS);
-}
-
-static void ps8622_post_disable(struct drm_bridge *bridge)
-{
- struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
-
- if (!ps8622->enabled)
- return;
-
- ps8622->enabled = false;
-
- /*
- * This doesn't matter if the regulators are turned off, but something
- * else might keep them on. In that case, we want to assert the slp gpio
- * to lower power.
- */
- gpiod_set_value(ps8622->gpio_slp, 0);
-
- if (drm_panel_unprepare(ps8622->panel)) {
- DRM_ERROR("failed to unprepare panel\n");
- return;
- }
-
- if (ps8622->v12)
- regulator_disable(ps8622->v12);
-
- /*
- * Sleep for at least the amount of time that it takes the power rail to
- * fall to prevent asserting the rst gpio from doing anything.
- */
- usleep_range(PS8622_POWER_FALL_T16_MAX_US,
- 2 * PS8622_POWER_FALL_T16_MAX_US);
- gpiod_set_value(ps8622->gpio_rst, 0);
-
- msleep(PS8622_POWER_OFF_T17_MS);
-}
-
-static int ps8622_get_modes(struct drm_connector *connector)
-{
- struct ps8622_bridge *ps8622;
-
- ps8622 = connector_to_ps8622(connector);
-
- return drm_panel_get_modes(ps8622->panel);
-}
-
-static struct drm_encoder *ps8622_best_encoder(struct drm_connector *connector)
-{
- struct ps8622_bridge *ps8622;
-
- ps8622 = connector_to_ps8622(connector);
-
- return ps8622->bridge.encoder;
-}
-
-static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = {
- .get_modes = ps8622_get_modes,
- .best_encoder = ps8622_best_encoder,
-};
-
-static enum drm_connector_status ps8622_detect(struct drm_connector *connector,
- bool force)
-{
- return connector_status_connected;
-}
-
-static void ps8622_connector_destroy(struct drm_connector *connector)
-{
- drm_connector_cleanup(connector);
-}
-
-static const struct drm_connector_funcs ps8622_connector_funcs = {
- .dpms = drm_helper_connector_dpms,
- .fill_modes = drm_helper_probe_single_connector_modes,
- .detect = ps8622_detect,
- .destroy = ps8622_connector_destroy,
-};
-
-static int ps8622_attach(struct drm_bridge *bridge)
-{
- struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
- int ret;
-
- if (!bridge->encoder) {
- DRM_ERROR("Parent encoder object not found");
- return -ENODEV;
- }
-
- ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD;
- ret = drm_connector_init(bridge->dev, &ps8622->connector,
- &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
- if (ret) {
- DRM_ERROR("Failed to initialize connector with drm\n");
- return ret;
- }
- drm_connector_helper_add(&ps8622->connector,
- &ps8622_connector_helper_funcs);
- drm_connector_register(&ps8622->connector);
- drm_mode_connector_attach_encoder(&ps8622->connector,
- bridge->encoder);
-
- if (ps8622->panel)
- drm_panel_attach(ps8622->panel, &ps8622->connector);
-
- drm_helper_hpd_irq_event(ps8622->connector.dev);
-
- return ret;
-}
-
-static const struct drm_bridge_funcs ps8622_bridge_funcs = {
- .pre_enable = ps8622_pre_enable,
- .enable = ps8622_enable,
- .disable = ps8622_disable,
- .post_disable = ps8622_post_disable,
- .attach = ps8622_attach,
-};
-
-static const struct of_device_id ps8622_devices[] = {
- {.compatible = "parade,ps8622",},
- {.compatible = "parade,ps8625",},
- {}
-};
-MODULE_DEVICE_TABLE(of, ps8622_devices);
-
-static int ps8622_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct device *dev = &client->dev;
- struct device_node *endpoint, *panel_node;
- struct ps8622_bridge *ps8622;
- int ret;
-
- ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL);
- if (!ps8622)
- return -ENOMEM;
-
- endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
- if (endpoint) {
- panel_node = of_graph_get_remote_port_parent(endpoint);
- if (panel_node) {
- ps8622->panel = of_drm_find_panel(panel_node);
- of_node_put(panel_node);
- if (!ps8622->panel)
- return -EPROBE_DEFER;
- }
- }
-
- ps8622->client = client;
-
- ps8622->v12 = devm_regulator_get(dev, "vdd12");
- if (IS_ERR(ps8622->v12)) {
- dev_info(dev, "no 1.2v regulator found for PS8622\n");
- ps8622->v12 = NULL;
- }
-
- ps8622->gpio_slp = devm_gpiod_get(dev, "sleep");
- if (IS_ERR(ps8622->gpio_slp)) {
- ret = PTR_ERR(ps8622->gpio_slp);
- dev_err(dev, "cannot get gpio_slp %d\n", ret);
- return ret;
- }
- ret = gpiod_direction_output(ps8622->gpio_slp, 1);
- if (ret) {
- dev_err(dev, "cannot configure gpio_slp\n");
- return ret;
- }
-
- ps8622->gpio_rst = devm_gpiod_get(dev, "reset");
- if (IS_ERR(ps8622->gpio_rst)) {
- ret = PTR_ERR(ps8622->gpio_rst);
- dev_err(dev, "cannot get gpio_rst %d\n", ret);
- return ret;
- }
- /*
- * Assert the reset pin high to avoid the bridge being
- * initialized prematurely
- */
- ret = gpiod_direction_output(ps8622->gpio_rst, 1);
- if (ret) {
- dev_err(dev, "cannot configure gpio_rst\n");
- return ret;
- }
-
- ps8622->max_lane_count = id->driver_data;
-
- if (of_property_read_u32(dev->of_node, "lane-count",
- &ps8622->lane_count)) {
- ps8622->lane_count = ps8622->max_lane_count;
- } else if (ps8622->lane_count > ps8622->max_lane_count) {
- dev_info(dev, "lane-count property is too high,"
- "using max_lane_count\n");
- 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.of_node = dev->of_node;
- ret = drm_bridge_add(&ps8622->bridge);
- if (ret) {
- DRM_ERROR("Failed to add bridge\n");
- return ret;
- }
-
- i2c_set_clientdata(client, ps8622);
-
- return 0;
-}
-
-static int ps8622_remove(struct i2c_client *client)
-{
- struct ps8622_bridge *ps8622 = i2c_get_clientdata(client);
-
- if (ps8622->bl)
- backlight_device_unregister(ps8622->bl);
-
- drm_bridge_remove(&ps8622->bridge);
-
- return 0;
-}
-
-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",
- .owner = THIS_MODULE,
- .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");
Code Review / kvmfornfv.git / blobdiff