// SPDX-License-Identifier: GPL-2.0
/*
* Samsung S6D7AA0 MIPI-DSI TFT LCD controller drm_panel driver.
*
* Copyright (C) 2022 Artur Weber <[email protected]>
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/of.h>
#include <video/mipi_display.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
/* Manufacturer command set */
#define MCS_BL_CTL 0xc3
#define MCS_OTP_RELOAD 0xd0
#define MCS_PASSWD1 0xf0
#define MCS_PASSWD2 0xf1
#define MCS_PASSWD3 0xfc
struct s6d7aa0 {
struct drm_panel panel;
struct mipi_dsi_device *dsi;
struct gpio_desc *reset_gpio;
struct regulator_bulk_data supplies[2];
const struct s6d7aa0_panel_desc *desc;
};
struct s6d7aa0_panel_desc {
unsigned int panel_type;
int (*init_func)(struct s6d7aa0 *ctx);
int (*off_func)(struct s6d7aa0 *ctx);
const struct drm_display_mode *drm_mode;
unsigned long mode_flags;
u32 bus_flags;
bool has_backlight;
bool use_passwd3;
};
enum s6d7aa0_panels {
S6D7AA0_PANEL_LSL080AL02,
S6D7AA0_PANEL_LSL080AL03,
S6D7AA0_PANEL_LTL101AT01,
};
static inline struct s6d7aa0 *panel_to_s6d7aa0(struct drm_panel *panel)
{
return container_of(panel, struct s6d7aa0, panel);
}
static void s6d7aa0_reset(struct s6d7aa0 *ctx)
{
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
msleep(50);
gpiod_set_value_cansleep(ctx->reset_gpio, 0);
msleep(50);
}
static int s6d7aa0_lock(struct s6d7aa0 *ctx, bool lock)
{
struct mipi_dsi_device *dsi = ctx->dsi;
if (lock) {
mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD1, 0xa5, 0xa5);
mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD2, 0xa5, 0xa5);
if (ctx->desc->use_passwd3)
mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD3, 0x5a, 0x5a);
} else {
mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD1, 0x5a, 0x5a);
mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD2, 0x5a, 0x5a);
if (ctx->desc->use_passwd3)
mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD3, 0xa5, 0xa5);
}
return 0;
}
static int s6d7aa0_on(struct s6d7aa0 *ctx)
{
struct mipi_dsi_device *dsi = ctx->dsi;
struct device *dev = &dsi->dev;
int ret;
ret = ctx->desc->init_func(ctx);
if (ret < 0) {
dev_err(dev, "Failed to initialize panel: %d\n", ret);
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
return ret;
}
ret = mipi_dsi_dcs_set_display_on(dsi);
if (ret < 0) {
dev_err(dev, "Failed to set display on: %d\n", ret);
return ret;
}
return 0;
}
static int s6d7aa0_off(struct s6d7aa0 *ctx)
{
struct mipi_dsi_device *dsi = ctx->dsi;
struct device *dev = &dsi->dev;
int ret;
ret = ctx->desc->off_func(ctx);
if (ret < 0) {
dev_err(dev, "Panel-specific off function failed: %d\n", ret);
return ret;
}
ret = mipi_dsi_dcs_set_display_off(dsi);
if (ret < 0) {
dev_err(dev, "Failed to set display off: %d\n", ret);
return ret;
}
msleep(64);
ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
if (ret < 0) {
dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
return ret;
}
msleep(120);
return 0;
}
static int s6d7aa0_prepare(struct drm_panel *panel)
{
struct s6d7aa0 *ctx = panel_to_s6d7aa0(panel);
struct device *dev = &ctx->dsi->dev;
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
if (ret < 0) {
dev_err(dev, "Failed to enable regulators: %d\n", ret);
return ret;
}
s6d7aa0_reset(ctx);
ret = s6d7aa0_on(ctx);
if (ret < 0) {
dev_err(dev, "Failed to initialize panel: %d\n", ret);
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
return ret;
}
return 0;
}
static int s6d7aa0_disable(struct drm_panel *panel)
{
struct s6d7aa0 *ctx = panel_to_s6d7aa0(panel);
struct device *dev = &ctx->dsi->dev;
int ret;
ret = s6d7aa0_off(ctx);
if (ret < 0)
dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
return 0;
}
static int s6d7aa0_unprepare(struct drm_panel *panel)
{
struct s6d7aa0 *ctx = panel_to_s6d7aa0(panel);
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
return 0;
}
/* Backlight control code */
static int s6d7aa0_bl_update_status(struct backlight_device *bl)
{
struct mipi_dsi_device *dsi = bl_get_data(bl);
u16 brightness = backlight_get_brightness(bl);
int ret;
ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
if (ret < 0)
return ret;
return 0;
}
static int s6d7aa0_bl_get_brightness(struct backlight_device *bl)
{
struct mipi_dsi_device *dsi = bl_get_data(bl);
u16 brightness;
int ret;
ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
if (ret < 0)
return ret;
return brightness & 0xff;
}
static const struct backlight_ops s6d7aa0_bl_ops = {
.update_status = s6d7aa0_bl_update_status,
.get_brightness = s6d7aa0_bl_get_brightness,
};
static struct backlight_device *
s6d7aa0_create_backlight(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
const struct backlight_properties props = {
.type = BACKLIGHT_RAW,
.brightness = 255,
.max_brightness = 255,
};
return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
&s6d7aa0_bl_ops, &props);
}
/* Initialization code and structures for LSL080AL02 panel */
static int s6d7aa0_lsl080al02_init(struct s6d7aa0 *ctx)
{
struct mipi_dsi_device *dsi = ctx->dsi;
struct device *dev = &dsi->dev;
int ret;
usleep_range(20000, 25000);
ret = s6d7aa0_lock(ctx, false);
if (ret < 0) {
dev_err(dev, "Failed to unlock registers: %d\n", ret);
return ret;
}
mipi_dsi_dcs_write_seq(dsi, MCS_OTP_RELOAD, 0x00, 0x10);
usleep_range(1000, 1500);
/* SEQ_B6_PARAM_8_R01 */
mipi_dsi_dcs_write_seq(dsi, 0xb6, 0x10);
/* BL_CTL_ON */
mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0x40, 0x00, 0x28);
usleep_range(5000, 6000);
mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x04);
ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
if (ret < 0) {
dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
return ret;
}
msleep(120);
mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
ret = s6d7aa0_lock(ctx, true);
if (ret < 0) {
dev_err(dev, "Failed to lock registers: %d\n", ret);
return ret;
}
ret = mipi_dsi_dcs_set_display_on(dsi);
if (ret < 0) {
dev_err(dev, "Failed to set display on: %d\n", ret);
return ret;
}
return 0;
}
static int s6d7aa0_lsl080al02_off(struct s6d7aa0 *ctx)
{
struct mipi_dsi_device *dsi = ctx->dsi;
/* BL_CTL_OFF */
mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0x40, 0x00, 0x20);
return 0;
}
static const struct drm_display_mode s6d7aa0_lsl080al02_mode = {
.clock = (800 + 16 + 4 + 140) * (1280 + 8 + 4 + 4) * 60 / 1000,
.hdisplay = 800,
.hsync_start = 800 + 16,
.hsync_end = 800 + 16 + 4,
.htotal = 800 + 16 + 4 + 140,
.vdisplay = 1280,
.vsync_start = 1280 + 8,
.vsync_end = 1280 + 8 + 4,
.vtotal = 1280 + 8 + 4 + 4,
.width_mm = 108,
.height_mm = 173,
};
static const struct s6d7aa0_panel_desc s6d7aa0_lsl080al02_desc = {
.panel_type = S6D7AA0_PANEL_LSL080AL02,
.init_func = s6d7aa0_lsl080al02_init,
.off_func = s6d7aa0_lsl080al02_off,
.drm_mode = &s6d7aa0_lsl080al02_mode,
.mode_flags = MIPI_DSI_MODE_VSYNC_FLUSH | MIPI_DSI_MODE_VIDEO_NO_HFP,
.bus_flags = 0,
.has_backlight = false,
.use_passwd3 = false,
};
/* Initialization code and structures for LSL080AL03 panel */
static int s6d7aa0_lsl080al03_init(struct s6d7aa0 *ctx)
{
struct mipi_dsi_device *dsi = ctx->dsi;
struct device *dev = &dsi->dev;
int ret;
usleep_range(20000, 25000);
ret = s6d7aa0_lock(ctx, false);
if (ret < 0) {
dev_err(dev, "Failed to unlock registers: %d\n", ret);
return ret;
}
if (ctx->desc->panel_type == S6D7AA0_PANEL_LSL080AL03) {
mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0xc7, 0x00, 0x29);
mipi_dsi_dcs_write_seq(dsi, 0xbc, 0x01, 0x4e, 0xa0);
mipi_dsi_dcs_write_seq(dsi, 0xfd, 0x16, 0x10, 0x11, 0x23,
0x09);
mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x00, 0x02, 0x03, 0x21,
0x80, 0x78);
} else if (ctx->desc->panel_type == S6D7AA0_PANEL_LTL101AT01) {
mipi_dsi_dcs_write_seq(dsi, MCS_BL_CTL, 0x40, 0x00, 0x08);
mipi_dsi_dcs_write_seq(dsi, 0xbc, 0x01, 0x4e, 0x0b);
mipi_dsi_dcs_write_seq(dsi, 0xfd, 0x16, 0x10, 0x11, 0x23,
0x09);
mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x00, 0x02, 0x03, 0x21,
0x80, 0x68);
}
mipi_dsi_dcs_write_seq(dsi, 0xb3, 0x51);
mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x24);
mipi_dsi_dcs_write_seq(dsi, 0xf2, 0x02, 0x08, 0x08);
usleep_range(10000, 11000);
mipi_dsi_dcs_write_seq(dsi, 0xc0, 0x80, 0x80, 0x30);
mipi_dsi_dcs_write_seq(dsi, 0xcd,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e);
mipi_dsi_dcs_write_seq(dsi, 0xce,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00);
mipi_dsi_dcs_write_seq(dsi, 0xc1, 0x03);
ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
if (ret < 0) {
dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
return ret;
}
ret = s6d7aa0_lock(ctx, true);
if (ret < 0) {
dev_err(dev, "Failed to lock registers: %d\n", ret);
return ret;
}
ret = mipi_dsi_dcs_set_display_on(dsi);
if (ret < 0) {
dev_err(dev, "Failed to set display on: %d\n", ret);
return ret;
}
return 0;
}
static int s6d7aa0_lsl080al03_off(struct s6d7aa0 *ctx)
{
struct mipi_dsi_device *dsi = ctx->dsi;
mipi_dsi_dcs_write_seq(dsi, 0x22, 0x00);
return 0;
}
static const struct drm_display_mode s6d7aa0_lsl080al03_mode = {
.clock = (768 + 18 + 16 + 126) * (1024 + 8 + 2 + 6) * 60 / 1000,
.hdisplay = 768,
.hsync_start = 768 + 18,
.hsync_end = 768 + 18 + 16,
.htotal = 768 + 18 + 16 + 126,
.vdisplay = 1024,
.vsync_start = 1024 + 8,
.vsync_end = 1024 + 8 + 2,
.vtotal = 1024 + 8 + 2 + 6,
.width_mm = 122,
.height_mm = 163,
};
static const struct s6d7aa0_panel_desc s6d7aa0_lsl080al03_desc = {
.panel_type = S6D7AA0_PANEL_LSL080AL03,
.init_func = s6d7aa0_lsl080al03_init,
.off_func = s6d7aa0_lsl080al03_off,
.drm_mode = &s6d7aa0_lsl080al03_mode,
.mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET,
.bus_flags = 0,
.has_backlight = true,
.use_passwd3 = true,
};
/* Initialization structures for LTL101AT01 panel */
static const struct drm_display_mode s6d7aa0_ltl101at01_mode = {
.clock = (768 + 96 + 16 + 184) * (1024 + 8 + 2 + 6) * 60 / 1000,
.hdisplay = 768,
.hsync_start = 768 + 96,
.hsync_end = 768 + 96 + 16,
.htotal = 768 + 96 + 16 + 184,
.vdisplay = 1024,
.vsync_start = 1024 + 8,
.vsync_end = 1024 + 8 + 2,
.vtotal = 1024 + 8 + 2 + 6,
.width_mm = 148,
.height_mm = 197,
};
static const struct s6d7aa0_panel_desc s6d7aa0_ltl101at01_desc = {
.panel_type = S6D7AA0_PANEL_LTL101AT01,
.init_func = s6d7aa0_lsl080al03_init, /* Similar init to LSL080AL03 */
.off_func = s6d7aa0_lsl080al03_off,
.drm_mode = &s6d7aa0_ltl101at01_mode,
.mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET,
.bus_flags = 0,
.has_backlight = true,
.use_passwd3 = true,
};
static int s6d7aa0_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
struct s6d7aa0 *ctx;
ctx = container_of(panel, struct s6d7aa0, panel);
if (!ctx)
return -EINVAL;
mode = drm_mode_duplicate(connector->dev, ctx->desc->drm_mode);
if (!mode)
return -ENOMEM;
drm_mode_set_name(mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
connector->display_info.width_mm = mode->width_mm;
connector->display_info.height_mm = mode->height_mm;
connector->display_info.bus_flags = ctx->desc->bus_flags;
drm_mode_probed_add(connector, mode);
return 1;
}
static const struct drm_panel_funcs s6d7aa0_panel_funcs = {
.disable = s6d7aa0_disable,
.prepare = s6d7aa0_prepare,
.unprepare = s6d7aa0_unprepare,
.get_modes = s6d7aa0_get_modes,
};
static int s6d7aa0_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
struct s6d7aa0 *ctx;
int ret;
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->desc = of_device_get_match_data(dev);
if (!ctx->desc)
return -ENODEV;
ctx->supplies[0].supply = "power";
ctx->supplies[1].supply = "vmipi";
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
ctx->supplies);
if (ret < 0)
return dev_err_probe(dev, ret, "Failed to get regulators\n");
ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(ctx->reset_gpio))
return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
"Failed to get reset-gpios\n");
ctx->dsi = dsi;
mipi_dsi_set_drvdata(dsi, ctx);
dsi->lanes = 4;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST
| ctx->desc->mode_flags;
drm_panel_init(&ctx->panel, dev, &s6d7aa0_panel_funcs,
DRM_MODE_CONNECTOR_DSI);
ctx->panel.prepare_prev_first = true;
ret = drm_panel_of_backlight(&ctx->panel);
if (ret)
return dev_err_probe(dev, ret, "Failed to get backlight\n");
/* Use DSI-based backlight as fallback if available */
if (ctx->desc->has_backlight && !ctx->panel.backlight) {
ctx->panel.backlight = s6d7aa0_create_backlight(dsi);
if (IS_ERR(ctx->panel.backlight))
return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
"Failed to create backlight\n");
}
drm_panel_add(&ctx->panel);
ret = mipi_dsi_attach(dsi);
if (ret < 0) {
dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
drm_panel_remove(&ctx->panel);
return ret;
}
return 0;
}
static void s6d7aa0_remove(struct mipi_dsi_device *dsi)
{
struct s6d7aa0 *ctx = mipi_dsi_get_drvdata(dsi);
int ret;
ret = mipi_dsi_detach(dsi);
if (ret < 0)
dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
drm_panel_remove(&ctx->panel);
}
static const struct of_device_id s6d7aa0_of_match[] = {
{
.compatible = "samsung,lsl080al02",
.data = &s6d7aa0_lsl080al02_desc
},
{
.compatible = "samsung,lsl080al03",
.data = &s6d7aa0_lsl080al03_desc
},
{
.compatible = "samsung,ltl101at01",
.data = &s6d7aa0_ltl101at01_desc
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, s6d7aa0_of_match);
static struct mipi_dsi_driver s6d7aa0_driver = {
.probe = s6d7aa0_probe,
.remove = s6d7aa0_remove,
.driver = {
.name = "panel-samsung-s6d7aa0",
.of_match_table = s6d7aa0_of_match,
},
};
module_mipi_dsi_driver(s6d7aa0_driver);
MODULE_AUTHOR("Artur Weber <[email protected]>");
MODULE_DESCRIPTION("Samsung S6D7AA0 MIPI-DSI LCD controller driver");
MODULE_LICENSE("GPL");
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