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/*
* 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/regulator/consumer.h>
#include <drm/drm_bridge.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#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 DP_NUM_LANES 4
/*
* 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 mipi_dsi_device *dsi;
struct i2c_client *page[MAX_DEVS];
struct regulator_bulk_data supplies[2];
struct gpio_desc *gpio_reset;
struct gpio_desc *gpio_powerdown;
bool powered;
};
static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
{
return container_of(e, struct ps8640, bridge);
}
static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
const enum ps8640_vdo_control ctrl)
{
struct i2c_client *client = ps_bridge->page[PAGE3_DSI_CNTL1];
u8 vdo_ctrl_buf[] = { VDO_CTL_ADD, ctrl };
int ret;
ret = i2c_smbus_write_i2c_block_data(client, PAGE3_SET_ADD,
sizeof(vdo_ctrl_buf),
vdo_ctrl_buf);
if (ret < 0) {
DRM_ERROR("failed to %sable VDO: %d\n",
ctrl == ENABLE ? "en" : "dis", ret);
return ret;
}
return 0;
}
static void ps8640_bridge_poweron(struct ps8640 *ps_bridge)
{
struct i2c_client *client = ps_bridge->page[PAGE2_TOP_CNTL];
unsigned long timeout;
int ret, status;
if (ps_bridge->powered)
return;
ret = regulator_bulk_enable(ARRAY_SIZE(ps_bridge->supplies),
ps_bridge->supplies);
if (ret < 0) {
DRM_ERROR("cannot enable regulators %d\n", ret);
return;
}
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);
/*
* Wait for the ps8640 embedded MCU to be ready
* First wait 200ms and then check the MCU ready flag every 20ms
*/
msleep(200);
timeout = jiffies + msecs_to_jiffies(200) + 1;
while (time_is_after_jiffies(timeout)) {
status = i2c_smbus_read_byte_data(client, PAGE2_GPIO_H);
if (status < 0) {
DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", status);
goto err_regulators_disable;
}
if ((status & PS_GPIO9) == PS_GPIO9)
break;
msleep(20);
}
msleep(50);
/*
* 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.
*/
status = i2c_smbus_read_byte_data(client, PAGE2_MCS_EN);
if (status < 0) {
DRM_ERROR("failed read PAGE2_MCS_EN: %d\n", status);
goto err_regulators_disable;
}
ret = i2c_smbus_write_byte_data(client, PAGE2_MCS_EN,
status & ~MCS_EN);
if (ret < 0) {
DRM_ERROR("failed write PAGE2_MCS_EN: %d\n", ret);
goto err_regulators_disable;
}
/* Switch access edp panel's edid through i2c */
ret = i2c_smbus_write_byte_data(client, PAGE2_I2C_BYPASS,
I2C_BYPASS_EN);
if (ret < 0) {
DRM_ERROR("failed write PAGE2_I2C_BYPASS: %d\n", ret);
goto err_regulators_disable;
}
ps_bridge->powered = true;
return;
err_regulators_disable:
regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
ps_bridge->supplies);
}
static void ps8640_bridge_poweroff(struct ps8640 *ps_bridge)
{
int ret;
if (!ps_bridge->powered)
return;
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)
DRM_ERROR("cannot disable regulators %d\n", ret);
ps_bridge->powered = false;
}
static void ps8640_pre_enable(struct drm_bridge *bridge)
{
struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
int ret;
ps8640_bridge_poweron(ps_bridge);
ret = ps8640_bridge_vdo_control(ps_bridge, ENABLE);
if (ret < 0)
ps8640_bridge_poweroff(ps_bridge);
}
static void ps8640_post_disable(struct drm_bridge *bridge)
{
struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
ps8640_bridge_vdo_control(ps_bridge, DISABLE);
ps8640_bridge_poweroff(ps_bridge);
}
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;
struct device_node *in_ep, *dsi_node;
struct mipi_dsi_device *dsi;
struct mipi_dsi_host *host;
int ret;
const struct mipi_dsi_device_info info = { .type = "ps8640",
.channel = 0,
.node = NULL,
};
if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
return -EINVAL;
/* 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 -ENODEV;
dsi = mipi_dsi_device_register_full(host, &info);
if (IS_ERR(dsi)) {
dev_err(dev, "failed to create dsi device\n");
ret = PTR_ERR(dsi);
return ret;
}
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 = DP_NUM_LANES;
ret = mipi_dsi_attach(dsi);
if (ret)
goto err_dsi_attach;
/* Attach the panel-bridge to the dsi bridge */
return drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge,
&ps_bridge->bridge, flags);
err_dsi_attach:
mipi_dsi_device_unregister(dsi);
return ret;
}
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->powered;
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 const struct drm_bridge_funcs ps8640_bridge_funcs = {
.attach = ps8640_bridge_attach,
.get_edid = ps8640_bridge_get_edid,
.post_disable = ps8640_post_disable,
.pre_enable = ps8640_pre_enable,
};
static int ps8640_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct device_node *np = dev->of_node;
struct ps8640 *ps_bridge;
struct drm_panel *panel;
int ret;
u32 i;
ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
if (!ps_bridge)
return -ENOMEM;
/* port@1 is ps8640 output port */
ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
if (ret < 0)
return ret;
if (!panel)
return -ENODEV;
ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
if (IS_ERR(ps_bridge->panel_bridge))
return PTR_ERR(ps_bridge->panel_bridge);
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.ops = DRM_BRIDGE_OP_EDID;
ps_bridge->bridge.type = DRM_MODE_CONNECTOR_eDP;
ps_bridge->page[PAGE0_DP_CNTL] = client;
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])) {
dev_err(dev, "failed i2c dummy device, address %02x\n",
client->addr + i);
return PTR_ERR(ps_bridge->page[i]);
}
}
i2c_set_clientdata(client, ps_bridge);
drm_bridge_add(&ps_bridge->bridge);
return 0;
}
static int ps8640_remove(struct i2c_client *client)
{
struct ps8640 *ps_bridge = i2c_get_clientdata(client);
drm_bridge_remove(&ps_bridge->bridge);
return 0;
}
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,
.remove = ps8640_remove,
.driver = {
.name = "ps8640",
.of_match_table = ps8640_match,
},
};
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");
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