blob: 31e88cb39f8a0d7fc013f81aa4cf46ea6bd3cc56 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2016 MediaTek Inc.
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <drm/display/drm_dp_aux_bus.h>
#include <drm/display/drm_dp_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_edid.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#define PAGE0_AUXCH_CFG3 0x76
#define AUXCH_CFG3_RESET 0xff
#define PAGE0_SWAUX_ADDR_7_0 0x7d
#define PAGE0_SWAUX_ADDR_15_8 0x7e
#define PAGE0_SWAUX_ADDR_23_16 0x7f
#define SWAUX_ADDR_MASK GENMASK(19, 0)
#define PAGE0_SWAUX_LENGTH 0x80
#define SWAUX_LENGTH_MASK GENMASK(3, 0)
#define SWAUX_NO_PAYLOAD BIT(7)
#define PAGE0_SWAUX_WDATA 0x81
#define PAGE0_SWAUX_RDATA 0x82
#define PAGE0_SWAUX_CTRL 0x83
#define SWAUX_SEND BIT(0)
#define PAGE0_SWAUX_STATUS 0x84
#define SWAUX_M_MASK GENMASK(4, 0)
#define SWAUX_STATUS_MASK GENMASK(7, 5)
#define SWAUX_STATUS_NACK (0x1 << 5)
#define SWAUX_STATUS_DEFER (0x2 << 5)
#define SWAUX_STATUS_ACKM (0x3 << 5)
#define SWAUX_STATUS_INVALID (0x4 << 5)
#define SWAUX_STATUS_I2C_NACK (0x5 << 5)
#define SWAUX_STATUS_I2C_DEFER (0x6 << 5)
#define SWAUX_STATUS_TIMEOUT (0x7 << 5)
#define PAGE2_GPIO_H 0xa7
#define PS_GPIO9 BIT(1)
#define PAGE2_I2C_BYPASS 0xea
#define I2C_BYPASS_EN 0xd0
#define PAGE2_MCS_EN 0xf3
#define MCS_EN BIT(0)
#define PAGE3_SET_ADD 0xfe
#define VDO_CTL_ADD 0x13
#define VDO_DIS 0x18
#define VDO_EN 0x1c
#define NUM_MIPI_LANES 4
#define COMMON_PS8640_REGMAP_CONFIG \
.reg_bits = 8, \
.val_bits = 8, \
.cache_type = REGCACHE_NONE
/*
* PS8640 uses multiple addresses:
* page[0]: for DP control
* page[1]: for VIDEO Bridge
* page[2]: for control top
* page[3]: for DSI Link Control1
* page[4]: for MIPI Phy
* page[5]: for VPLL
* page[6]: for DSI Link Control2
* page[7]: for SPI ROM mapping
*/
enum page_addr_offset {
PAGE0_DP_CNTL = 0,
PAGE1_VDO_BDG,
PAGE2_TOP_CNTL,
PAGE3_DSI_CNTL1,
PAGE4_MIPI_PHY,
PAGE5_VPLL,
PAGE6_DSI_CNTL2,
PAGE7_SPI_CNTL,
MAX_DEVS
};
enum ps8640_vdo_control {
DISABLE = VDO_DIS,
ENABLE = VDO_EN,
};
struct ps8640 {
struct drm_bridge bridge;
struct drm_bridge *panel_bridge;
struct drm_dp_aux aux;
struct mipi_dsi_device *dsi;
struct i2c_client *page[MAX_DEVS];
struct regmap *regmap[MAX_DEVS];
struct regulator_bulk_data supplies[2];
struct gpio_desc *gpio_reset;
struct gpio_desc *gpio_powerdown;
struct device_link *link;
bool pre_enabled;
};
static const struct regmap_config ps8640_regmap_config[] = {
[PAGE0_DP_CNTL] = {
COMMON_PS8640_REGMAP_CONFIG,
.max_register = 0xbf,
},
[PAGE1_VDO_BDG] = {
COMMON_PS8640_REGMAP_CONFIG,
.max_register = 0xff,
},
[PAGE2_TOP_CNTL] = {
COMMON_PS8640_REGMAP_CONFIG,
.max_register = 0xff,
},
[PAGE3_DSI_CNTL1] = {
COMMON_PS8640_REGMAP_CONFIG,
.max_register = 0xff,
},
[PAGE4_MIPI_PHY] = {
COMMON_PS8640_REGMAP_CONFIG,
.max_register = 0xff,
},
[PAGE5_VPLL] = {
COMMON_PS8640_REGMAP_CONFIG,
.max_register = 0x7f,
},
[PAGE6_DSI_CNTL2] = {
COMMON_PS8640_REGMAP_CONFIG,
.max_register = 0xff,
},
[PAGE7_SPI_CNTL] = {
COMMON_PS8640_REGMAP_CONFIG,
.max_register = 0xff,
},
};
static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
{
return container_of(e, struct ps8640, bridge);
}
static inline struct ps8640 *aux_to_ps8640(struct drm_dp_aux *aux)
{
return container_of(aux, struct ps8640, aux);
}
static bool ps8640_of_panel_on_aux_bus(struct device *dev)
{
struct device_node *bus, *panel;
bus = of_get_child_by_name(dev->of_node, "aux-bus");
if (!bus)
return false;
panel = of_get_child_by_name(bus, "panel");
of_node_put(bus);
if (!panel)
return false;
of_node_put(panel);
return true;
}
static int _ps8640_wait_hpd_asserted(struct ps8640 *ps_bridge, unsigned long wait_us)
{
struct regmap *map = ps_bridge->regmap[PAGE2_TOP_CNTL];
int status;
/*
* Apparently something about the firmware in the chip signals that
* HPD goes high by reporting GPIO9 as high (even though HPD isn't
* actually connected to GPIO9).
*/
return regmap_read_poll_timeout(map, PAGE2_GPIO_H, status,
status & PS_GPIO9, wait_us / 10, wait_us);
}
static int ps8640_wait_hpd_asserted(struct drm_dp_aux *aux, unsigned long wait_us)
{
struct ps8640 *ps_bridge = aux_to_ps8640(aux);
struct device *dev = &ps_bridge->page[PAGE0_DP_CNTL]->dev;
int ret;
/*
* Note that this function is called by code that has already powered
* the panel. We have to power ourselves up but we don't need to worry
* about powering the panel.
*/
pm_runtime_get_sync(dev);
ret = _ps8640_wait_hpd_asserted(ps_bridge, wait_us);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
return ret;
}
static ssize_t ps8640_aux_transfer_msg(struct drm_dp_aux *aux,
struct drm_dp_aux_msg *msg)
{
struct ps8640 *ps_bridge = aux_to_ps8640(aux);
struct regmap *map = ps_bridge->regmap[PAGE0_DP_CNTL];
struct device *dev = &ps_bridge->page[PAGE0_DP_CNTL]->dev;
unsigned int len = msg->size;
unsigned int data;
unsigned int base;
int ret;
u8 request = msg->request &
~(DP_AUX_I2C_MOT | DP_AUX_I2C_WRITE_STATUS_UPDATE);
u8 *buf = msg->buffer;
u8 addr_len[PAGE0_SWAUX_LENGTH + 1 - PAGE0_SWAUX_ADDR_7_0];
u8 i;
bool is_native_aux = false;
if (len > DP_AUX_MAX_PAYLOAD_BYTES)
return -EINVAL;
if (msg->address & ~SWAUX_ADDR_MASK)
return -EINVAL;
switch (request) {
case DP_AUX_NATIVE_WRITE:
case DP_AUX_NATIVE_READ:
is_native_aux = true;
fallthrough;
case DP_AUX_I2C_WRITE:
case DP_AUX_I2C_READ:
break;
default:
return -EINVAL;
}
ret = regmap_write(map, PAGE0_AUXCH_CFG3, AUXCH_CFG3_RESET);
if (ret) {
DRM_DEV_ERROR(dev, "failed to write PAGE0_AUXCH_CFG3: %d\n",
ret);
return ret;
}
/* Assume it's good */
msg->reply = 0;
base = PAGE0_SWAUX_ADDR_7_0;
addr_len[PAGE0_SWAUX_ADDR_7_0 - base] = msg->address;
addr_len[PAGE0_SWAUX_ADDR_15_8 - base] = msg->address >> 8;
addr_len[PAGE0_SWAUX_ADDR_23_16 - base] = (msg->address >> 16) |
(msg->request << 4);
addr_len[PAGE0_SWAUX_LENGTH - base] = (len == 0) ? SWAUX_NO_PAYLOAD :
((len - 1) & SWAUX_LENGTH_MASK);
regmap_bulk_write(map, PAGE0_SWAUX_ADDR_7_0, addr_len,
ARRAY_SIZE(addr_len));
if (len && (request == DP_AUX_NATIVE_WRITE ||
request == DP_AUX_I2C_WRITE)) {
/* Write to the internal FIFO buffer */
for (i = 0; i < len; i++) {
ret = regmap_write(map, PAGE0_SWAUX_WDATA, buf[i]);
if (ret) {
DRM_DEV_ERROR(dev,
"failed to write WDATA: %d\n",
ret);
return ret;
}
}
}
regmap_write(map, PAGE0_SWAUX_CTRL, SWAUX_SEND);
/* Zero delay loop because i2c transactions are slow already */
regmap_read_poll_timeout(map, PAGE0_SWAUX_CTRL, data,
!(data & SWAUX_SEND), 0, 50 * 1000);
regmap_read(map, PAGE0_SWAUX_STATUS, &data);
if (ret) {
DRM_DEV_ERROR(dev, "failed to read PAGE0_SWAUX_STATUS: %d\n",
ret);
return ret;
}
switch (data & SWAUX_STATUS_MASK) {
/* Ignore the DEFER cases as they are already handled in hardware */
case SWAUX_STATUS_NACK:
case SWAUX_STATUS_I2C_NACK:
/*
* The programming guide is not clear about whether a I2C NACK
* would trigger SWAUX_STATUS_NACK or SWAUX_STATUS_I2C_NACK. So
* we handle both cases together.
*/
if (is_native_aux)
msg->reply |= DP_AUX_NATIVE_REPLY_NACK;
else
msg->reply |= DP_AUX_I2C_REPLY_NACK;
fallthrough;
case SWAUX_STATUS_ACKM:
len = data & SWAUX_M_MASK;
break;
case SWAUX_STATUS_INVALID:
return -EOPNOTSUPP;
case SWAUX_STATUS_TIMEOUT:
return -ETIMEDOUT;
}
if (len && (request == DP_AUX_NATIVE_READ ||
request == DP_AUX_I2C_READ)) {
/* Read from the internal FIFO buffer */
for (i = 0; i < len; i++) {
ret = regmap_read(map, PAGE0_SWAUX_RDATA, &data);
if (ret) {
DRM_DEV_ERROR(dev,
"failed to read RDATA: %d\n",
ret);
return ret;
}
buf[i] = data;
}
}
return len;
}
static ssize_t ps8640_aux_transfer(struct drm_dp_aux *aux,
struct drm_dp_aux_msg *msg)
{
struct ps8640 *ps_bridge = aux_to_ps8640(aux);
struct device *dev = &ps_bridge->page[PAGE0_DP_CNTL]->dev;
int ret;
pm_runtime_get_sync(dev);
ret = ps8640_aux_transfer_msg(aux, msg);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
return ret;
}
static void ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
const enum ps8640_vdo_control ctrl)
{
struct regmap *map = ps_bridge->regmap[PAGE3_DSI_CNTL1];
struct device *dev = &ps_bridge->page[PAGE3_DSI_CNTL1]->dev;
u8 vdo_ctrl_buf[] = { VDO_CTL_ADD, ctrl };
int ret;
ret = regmap_bulk_write(map, PAGE3_SET_ADD,
vdo_ctrl_buf, sizeof(vdo_ctrl_buf));
if (ret < 0)
dev_err(dev, "failed to %sable VDO: %d\n",
ctrl == ENABLE ? "en" : "dis", ret);
}
static int __maybe_unused ps8640_resume(struct device *dev)
{
struct ps8640 *ps_bridge = dev_get_drvdata(dev);
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(ps_bridge->supplies),
ps_bridge->supplies);
if (ret < 0) {
dev_err(dev, "cannot enable regulators %d\n", ret);
return ret;
}
gpiod_set_value(ps_bridge->gpio_powerdown, 0);
gpiod_set_value(ps_bridge->gpio_reset, 1);
usleep_range(2000, 2500);
gpiod_set_value(ps_bridge->gpio_reset, 0);
/*
* Mystery 200 ms delay for the "MCU to be ready". It's unclear if
* this is truly necessary since the MCU will already signal that
* things are "good to go" by signaling HPD on "gpio 9". See
* _ps8640_wait_hpd_asserted(). For now we'll keep this mystery delay
* just in case.
*/
msleep(200);
return 0;
}
static int __maybe_unused ps8640_suspend(struct device *dev)
{
struct ps8640 *ps_bridge = dev_get_drvdata(dev);
int ret;
gpiod_set_value(ps_bridge->gpio_reset, 1);
gpiod_set_value(ps_bridge->gpio_powerdown, 1);
ret = regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
ps_bridge->supplies);
if (ret < 0)
dev_err(dev, "cannot disable regulators %d\n", ret);
return ret;
}
static const struct dev_pm_ops ps8640_pm_ops = {
SET_RUNTIME_PM_OPS(ps8640_suspend, ps8640_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
};
static void ps8640_pre_enable(struct drm_bridge *bridge)
{
struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
struct regmap *map = ps_bridge->regmap[PAGE2_TOP_CNTL];
struct device *dev = &ps_bridge->page[PAGE0_DP_CNTL]->dev;
int ret;
pm_runtime_get_sync(dev);
ret = _ps8640_wait_hpd_asserted(ps_bridge, 200 * 1000);
if (ret < 0)
dev_warn(dev, "HPD didn't go high: %d\n", ret);
/*
* The Manufacturer Command Set (MCS) is a device dependent interface
* intended for factory programming of the display module default
* parameters. Once the display module is configured, the MCS shall be
* disabled by the manufacturer. Once disabled, all MCS commands are
* ignored by the display interface.
*/
ret = regmap_update_bits(map, PAGE2_MCS_EN, MCS_EN, 0);
if (ret < 0)
dev_warn(dev, "failed write PAGE2_MCS_EN: %d\n", ret);
/* Switch access edp panel's edid through i2c */
ret = regmap_write(map, PAGE2_I2C_BYPASS, I2C_BYPASS_EN);
if (ret < 0)
dev_warn(dev, "failed write PAGE2_MCS_EN: %d\n", ret);
ps8640_bridge_vdo_control(ps_bridge, ENABLE);
ps_bridge->pre_enabled = true;
}
static void ps8640_post_disable(struct drm_bridge *bridge)
{
struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
ps_bridge->pre_enabled = false;
ps8640_bridge_vdo_control(ps_bridge, DISABLE);
pm_runtime_put_sync_suspend(&ps_bridge->page[PAGE0_DP_CNTL]->dev);
}
static int ps8640_bridge_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
struct device *dev = &ps_bridge->page[0]->dev;
int ret;
if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
return -EINVAL;
ps_bridge->aux.drm_dev = bridge->dev;
ret = drm_dp_aux_register(&ps_bridge->aux);
if (ret) {
dev_err(dev, "failed to register DP AUX channel: %d\n", ret);
return ret;
}
ps_bridge->link = device_link_add(bridge->dev->dev, dev, DL_FLAG_STATELESS);
if (!ps_bridge->link) {
dev_err(dev, "failed to create device link");
ret = -EINVAL;
goto err_devlink;
}
/* Attach the panel-bridge to the dsi bridge */
ret = drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge,
&ps_bridge->bridge, flags);
if (ret)
goto err_bridge_attach;
return 0;
err_bridge_attach:
device_link_del(ps_bridge->link);
err_devlink:
drm_dp_aux_unregister(&ps_bridge->aux);
return ret;
}
static void ps8640_bridge_detach(struct drm_bridge *bridge)
{
struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
drm_dp_aux_unregister(&ps_bridge->aux);
if (ps_bridge->link)
device_link_del(ps_bridge->link);
}
static struct edid *ps8640_bridge_get_edid(struct drm_bridge *bridge,
struct drm_connector *connector)
{
struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
bool poweroff = !ps_bridge->pre_enabled;
struct edid *edid;
/*
* When we end calling get_edid() triggered by an ioctl, i.e
*
* drm_mode_getconnector (ioctl)
* -> drm_helper_probe_single_connector_modes
* -> drm_bridge_connector_get_modes
* -> ps8640_bridge_get_edid
*
* We need to make sure that what we need is enabled before reading
* EDID, for this chip, we need to do a full poweron, otherwise it will
* fail.
*/
drm_bridge_chain_pre_enable(bridge);
edid = drm_get_edid(connector,
ps_bridge->page[PAGE0_DP_CNTL]->adapter);
/*
* If we call the get_edid() function without having enabled the chip
* before, return the chip to its original power state.
*/
if (poweroff)
drm_bridge_chain_post_disable(bridge);
return edid;
}
static void ps8640_runtime_disable(void *data)
{
pm_runtime_dont_use_autosuspend(data);
pm_runtime_disable(data);
}
static const struct drm_bridge_funcs ps8640_bridge_funcs = {
.attach = ps8640_bridge_attach,
.detach = ps8640_bridge_detach,
.get_edid = ps8640_bridge_get_edid,
.post_disable = ps8640_post_disable,
.pre_enable = ps8640_pre_enable,
};
static int ps8640_bridge_get_dsi_resources(struct device *dev, struct ps8640 *ps_bridge)
{
struct device_node *in_ep, *dsi_node;
struct mipi_dsi_device *dsi;
struct mipi_dsi_host *host;
const struct mipi_dsi_device_info info = { .type = "ps8640",
.channel = 0,
.node = NULL,
};
/* port@0 is ps8640 dsi input port */
in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
if (!in_ep)
return -ENODEV;
dsi_node = of_graph_get_remote_port_parent(in_ep);
of_node_put(in_ep);
if (!dsi_node)
return -ENODEV;
host = of_find_mipi_dsi_host_by_node(dsi_node);
of_node_put(dsi_node);
if (!host)
return -EPROBE_DEFER;
dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
if (IS_ERR(dsi)) {
dev_err(dev, "failed to create dsi device\n");
return PTR_ERR(dsi);
}
ps_bridge->dsi = dsi;
dsi->host = host;
dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->lanes = NUM_MIPI_LANES;
return 0;
}
static int ps8640_bridge_link_panel(struct drm_dp_aux *aux)
{
struct ps8640 *ps_bridge = aux_to_ps8640(aux);
struct device *dev = aux->dev;
struct device_node *np = dev->of_node;
int ret;
/*
* NOTE about returning -EPROBE_DEFER from this function: if we
* return an error (most relevant to -EPROBE_DEFER) it will only
* be passed out to ps8640_probe() if it called this directly (AKA the
* panel isn't under the "aux-bus" node). That should be fine because
* if the panel is under "aux-bus" it's guaranteed to have probed by
* the time this function has been called.
*/
/* port@1 is ps8640 output port */
ps_bridge->panel_bridge = devm_drm_of_get_bridge(dev, np, 1, 0);
if (IS_ERR(ps_bridge->panel_bridge))
return PTR_ERR(ps_bridge->panel_bridge);
ret = devm_drm_bridge_add(dev, &ps_bridge->bridge);
if (ret)
return ret;
return devm_mipi_dsi_attach(dev, ps_bridge->dsi);
}
static int ps8640_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct ps8640 *ps_bridge;
int ret;
u32 i;
ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
if (!ps_bridge)
return -ENOMEM;
ps_bridge->supplies[0].supply = "vdd33";
ps_bridge->supplies[1].supply = "vdd12";
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies),
ps_bridge->supplies);
if (ret)
return ret;
ps_bridge->gpio_powerdown = devm_gpiod_get(&client->dev, "powerdown",
GPIOD_OUT_HIGH);
if (IS_ERR(ps_bridge->gpio_powerdown))
return PTR_ERR(ps_bridge->gpio_powerdown);
/*
* Assert the reset to avoid the bridge being initialized prematurely
*/
ps_bridge->gpio_reset = devm_gpiod_get(&client->dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(ps_bridge->gpio_reset))
return PTR_ERR(ps_bridge->gpio_reset);
ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
ps_bridge->bridge.of_node = dev->of_node;
ps_bridge->bridge.type = DRM_MODE_CONNECTOR_eDP;
/*
* In the device tree, if panel is listed under aux-bus of the bridge
* node, panel driver should be able to retrieve EDID by itself using
* aux-bus. So let's not set DRM_BRIDGE_OP_EDID here.
*/
if (!ps8640_of_panel_on_aux_bus(&client->dev))
ps_bridge->bridge.ops = DRM_BRIDGE_OP_EDID;
/*
* Get MIPI DSI resources early. These can return -EPROBE_DEFER so
* we want to get them out of the way sooner.
*/
ret = ps8640_bridge_get_dsi_resources(&client->dev, ps_bridge);
if (ret)
return ret;
ps_bridge->page[PAGE0_DP_CNTL] = client;
ps_bridge->regmap[PAGE0_DP_CNTL] = devm_regmap_init_i2c(client, ps8640_regmap_config);
if (IS_ERR(ps_bridge->regmap[PAGE0_DP_CNTL]))
return PTR_ERR(ps_bridge->regmap[PAGE0_DP_CNTL]);
for (i = 1; i < ARRAY_SIZE(ps_bridge->page); i++) {
ps_bridge->page[i] = devm_i2c_new_dummy_device(&client->dev,
client->adapter,
client->addr + i);
if (IS_ERR(ps_bridge->page[i]))
return PTR_ERR(ps_bridge->page[i]);
ps_bridge->regmap[i] = devm_regmap_init_i2c(ps_bridge->page[i],
ps8640_regmap_config + i);
if (IS_ERR(ps_bridge->regmap[i]))
return PTR_ERR(ps_bridge->regmap[i]);
}
i2c_set_clientdata(client, ps_bridge);
ps_bridge->aux.name = "parade-ps8640-aux";
ps_bridge->aux.dev = dev;
ps_bridge->aux.transfer = ps8640_aux_transfer;
ps_bridge->aux.wait_hpd_asserted = ps8640_wait_hpd_asserted;
drm_dp_aux_init(&ps_bridge->aux);
pm_runtime_enable(dev);
/*
* Powering on ps8640 takes ~300ms. To avoid wasting time on power
* cycling ps8640 too often, set autosuspend_delay to 1000ms to ensure
* the bridge wouldn't suspend in between each _aux_transfer_msg() call
* during EDID read (~20ms in my experiment) and in between the last
* _aux_transfer_msg() call during EDID read and the _pre_enable() call
* (~100ms in my experiment).
*/
pm_runtime_set_autosuspend_delay(dev, 1000);
pm_runtime_use_autosuspend(dev);
pm_suspend_ignore_children(dev, true);
ret = devm_add_action_or_reset(dev, ps8640_runtime_disable, dev);
if (ret)
return ret;
ret = devm_of_dp_aux_populate_bus(&ps_bridge->aux, ps8640_bridge_link_panel);
/*
* If devm_of_dp_aux_populate_bus() returns -ENODEV then it's up to
* usa to call ps8640_bridge_link_panel() directly. NOTE: in this case
* the function is allowed to -EPROBE_DEFER.
*/
if (ret == -ENODEV)
return ps8640_bridge_link_panel(&ps_bridge->aux);
return ret;
}
static const struct of_device_id ps8640_match[] = {
{ .compatible = "parade,ps8640" },
{ }
};
MODULE_DEVICE_TABLE(of, ps8640_match);
static struct i2c_driver ps8640_driver = {
.probe_new = ps8640_probe,
.driver = {
.name = "ps8640",
.of_match_table = ps8640_match,
.pm = &ps8640_pm_ops,
},
};
module_i2c_driver(ps8640_driver);
MODULE_AUTHOR("Jitao Shi <jitao.shi@mediatek.com>");
MODULE_AUTHOR("CK Hu <ck.hu@mediatek.com>");
MODULE_AUTHOR("Enric Balletbo i Serra <enric.balletbo@collabora.com>");
MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
MODULE_LICENSE("GPL v2");