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// SPDX-License-Identifier: GPL-2.0+
/*
* LG LD070WX3-SL01 DSI panel driver
*
* Copyright (c) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
*/
#include <backlight.h>
#include <dm.h>
#include <panel.h>
#include <log.h>
#include <mipi_dsi.h>
#include <linux/delay.h>
#include <power/regulator.h>
struct lg_ld070wx3_priv {
struct udevice *vdd;
struct udevice *vcc;
struct udevice *backlight;
};
static struct display_timing default_timing = {
.pixelclock.typ = 70000000,
.hactive.typ = 800,
.hfront_porch.typ = 32,
.hback_porch.typ = 48,
.hsync_len.typ = 8,
.vactive.typ = 1280,
.vfront_porch.typ = 5,
.vback_porch.typ = 3,
.vsync_len.typ = 1,
};
static void dcs_write_one(struct mipi_dsi_device *dsi, u8 cmd, u8 data)
{
mipi_dsi_dcs_write(dsi, cmd, &data, 1);
}
static int lg_ld070wx3_enable_backlight(struct udevice *dev)
{
struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
struct mipi_dsi_device *dsi = plat->device;
int ret;
ret = mipi_dsi_dcs_soft_reset(dsi);
if (ret < 0) {
log_debug("%s: failed to soft reset panel: %d\n",
__func__, ret);
return ret;
}
/* Delay before sending new command after soft reset */
mdelay(20);
/* Differential input impedance selection */
dcs_write_one(dsi, 0xAE, 0x0B);
/* Enter test mode 1 and 2*/
dcs_write_one(dsi, 0xEE, 0xEA);
dcs_write_one(dsi, 0xEF, 0x5F);
/* Increased MIPI CLK driving ability */
dcs_write_one(dsi, 0xF2, 0x68);
/* Exit test mode 1 and 2 */
dcs_write_one(dsi, 0xEE, 0x00);
dcs_write_one(dsi, 0xEF, 0x00);
return 0;
}
static int lg_ld070wx3_set_backlight(struct udevice *dev, int percent)
{
struct lg_ld070wx3_priv *priv = dev_get_priv(dev);
int ret;
ret = backlight_enable(priv->backlight);
if (ret)
return ret;
return backlight_set_brightness(priv->backlight, percent);
}
static int lg_ld070wx3_timings(struct udevice *dev,
struct display_timing *timing)
{
memcpy(timing, &default_timing, sizeof(*timing));
return 0;
}
static int lg_ld070wx3_of_to_plat(struct udevice *dev)
{
struct lg_ld070wx3_priv *priv = dev_get_priv(dev);
int ret;
ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
"backlight", &priv->backlight);
if (ret) {
log_debug("%s: cannot get backlight: ret = %d\n",
__func__, ret);
return ret;
}
ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
"vdd-supply", &priv->vdd);
if (ret) {
log_debug("%s: cannot get vdd-supply: ret = %d\n",
__func__, ret);
return ret;
}
ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
"vcc-supply", &priv->vcc);
if (ret) {
log_debug("%s: cannot get vcc-supply: ret = %d\n",
__func__, ret);
return ret;
}
return 0;
}
static int lg_ld070wx3_hw_init(struct udevice *dev)
{
struct lg_ld070wx3_priv *priv = dev_get_priv(dev);
int ret;
ret = regulator_set_enable_if_allowed(priv->vcc, 1);
if (ret) {
log_debug("%s: enabling vcc-supply failed (%d)\n",
__func__, ret);
return ret;
}
ret = regulator_set_enable_if_allowed(priv->vdd, 1);
if (ret) {
log_debug("%s: enabling vdd-supply failed (%d)\n",
__func__, ret);
return ret;
}
/*
* According to spec delay between enabling supply is 0,
* for regulators to reach required voltage ~5ms needed.
* MIPI interface signal for setup requires additional
* 110ms which in total results in 115ms.
*/
mdelay(115);
return 0;
}
static int lg_ld070wx3_probe(struct udevice *dev)
{
struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
/* fill characteristics of DSI data link */
plat->lanes = 4;
plat->format = MIPI_DSI_FMT_RGB888;
plat->mode_flags = MIPI_DSI_MODE_VIDEO;
return lg_ld070wx3_hw_init(dev);
}
static const struct panel_ops lg_ld070wx3_ops = {
.enable_backlight = lg_ld070wx3_enable_backlight,
.set_backlight = lg_ld070wx3_set_backlight,
.get_display_timing = lg_ld070wx3_timings,
};
static const struct udevice_id lg_ld070wx3_ids[] = {
{ .compatible = "lg,ld070wx3-sl01" },
{ }
};
U_BOOT_DRIVER(lg_ld070wx3) = {
.name = "lg_ld070wx3",
.id = UCLASS_PANEL,
.of_match = lg_ld070wx3_ids,
.ops = &lg_ld070wx3_ops,
.of_to_plat = lg_ld070wx3_of_to_plat,
.probe = lg_ld070wx3_probe,
.plat_auto = sizeof(struct mipi_dsi_panel_plat),
.priv_auto = sizeof(struct lg_ld070wx3_priv),
};
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