// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2019, Michael Srba
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <video/mipi_display.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
struct s6e88a0_ams452ef01 {
struct drm_panel panel;
struct mipi_dsi_device *dsi;
struct regulator_bulk_data supplies[2 ];
struct gpio_desc *reset_gpio;
};
static inline struct
s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel)
{
return container_of(panel, struct s6e88a0_ams452ef01, panel);
}
static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx)
{
gpiod_set_value_cansleep(ctx->reset_gpio, 1 );
usleep_range(5000 , 6000 );
gpiod_set_value_cansleep(ctx->reset_gpio, 0 );
usleep_range(1000 , 2000 );
gpiod_set_value_cansleep(ctx->reset_gpio, 1 );
usleep_range(10000 , 11000 );
}
static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx)
{
struct mipi_dsi_device *dsi = ctx->dsi;
struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
dsi->mode_flags |= MIPI_DSI_MODE_LPM;
mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0 xf0, 0 x5a, 0 x5a); // enable LEVEL2 commands
mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0 xcc, 0 x4c); // set Pixel Clock Divider polarity
mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
mipi_dsi_msleep(&dsi_ctx, 120 );
// set default brightness/gama
mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0 xca,
0 x01, 0 x00, 0 x01, 0 x00, 0 x01, 0 x00,// V255 RR,GG,BB
0 x80, 0 x80, 0 x80, // V203 R,G,B
0 x80, 0 x80, 0 x80, // V151 R,G,B
0 x80, 0 x80, 0 x80, // V87 R,G,B
0 x80, 0 x80, 0 x80, // V51 R,G,B
0 x80, 0 x80, 0 x80, // V35 R,G,B
0 x80, 0 x80, 0 x80, // V23 R,G,B
0 x80, 0 x80, 0 x80, // V11 R,G,B
0 x6b, 0 x68, 0 x71, // V3 R,G,B
0 x00, 0 x00, 0 x00); // V1 R,G,B
// set default Amoled Off Ratio
mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0 xb2, 0 x40, 0 x0a, 0 x17, 0 x00, 0 x0a);
mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0 xb6, 0 x2c, 0 x0b); // set default elvss voltage
mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_POWER_SAVE, 0 x00);
mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0 xf7, 0 x03); // gamma/aor update
mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0 xf0, 0 xa5, 0 xa5); // disable LEVEL2 commands
mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
return dsi_ctx.accum_err;
}
static void s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx)
{
struct mipi_dsi_device *dsi = ctx->dsi;
struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi};
dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
mipi_dsi_msleep(&dsi_ctx, 35 );
mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
mipi_dsi_msleep(&dsi_ctx, 120 );
}
static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)
{
struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
if (ret < 0 )
return ret;
s6e88a0_ams452ef01_reset(ctx);
ret = s6e88a0_ams452ef01_on(ctx);
if (ret < 0 ) {
gpiod_set_value_cansleep(ctx->reset_gpio, 0 );
regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
ctx->supplies);
return ret;
}
return 0 ;
}
static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)
{
struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
s6e88a0_ams452ef01_off(ctx);
gpiod_set_value_cansleep(ctx->reset_gpio, 0 );
regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
return 0 ;
}
static const struct drm_display_mode s6e88a0_ams452ef01_mode = {
.clock = (540 + 88 + 4 + 20 ) * (960 + 14 + 2 + 8 ) * 60 / 1000 ,
.hdisplay = 540 ,
.hsync_start = 540 + 88 ,
.hsync_end = 540 + 88 + 4 ,
.htotal = 540 + 88 + 4 + 20 ,
.vdisplay = 960 ,
.vsync_start = 960 + 14 ,
.vsync_end = 960 + 14 + 2 ,
.vtotal = 960 + 14 + 2 + 8 ,
.width_mm = 56 ,
.height_mm = 100 ,
};
static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_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;
drm_mode_probed_add(connector, mode);
return 1 ;
}
static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = {
.unprepare = s6e88a0_ams452ef01_unprepare,
.prepare = s6e88a0_ams452ef01_prepare,
.get_modes = s6e88a0_ams452ef01_get_modes,
};
static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
struct s6e88a0_ams452ef01 *ctx;
int ret;
ctx = devm_drm_panel_alloc(dev, struct s6e88a0_ams452ef01, panel,
&s6e88a0_ams452ef01_panel_funcs,
DRM_MODE_CONNECTOR_DSI);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ctx->supplies[0 ].supply = "vdd3" ;
ctx->supplies[1 ].supply = "vci" ;
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
ctx->supplies);
if (ret < 0 ) {
dev_err(dev, "Failed to get regulators: %d\n" , ret);
return ret;
}
ctx->reset_gpio = devm_gpiod_get(dev, "reset" , GPIOD_OUT_LOW);
if (IS_ERR(ctx->reset_gpio)) {
ret = PTR_ERR(ctx->reset_gpio);
dev_err(dev, "Failed to get reset-gpios: %d\n" , ret);
return ret;
}
ctx->dsi = dsi;
mipi_dsi_set_drvdata(dsi, ctx);
dsi->lanes = 2 ;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
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 s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi)
{
struct s6e88a0_ams452ef01 *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 s6e88a0_ams452ef01_of_match[] = {
{ .compatible = "samsung,s6e88a0-ams452ef01" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match);
static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = {
.probe = s6e88a0_ams452ef01_probe,
.remove = s6e88a0_ams452ef01_remove,
.driver = {
.name = "panel-s6e88a0-ams452ef01" ,
.of_match_table = s6e88a0_ams452ef01_of_match,
},
};
module_mipi_dsi_driver(s6e88a0_ams452ef01_driver);
MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>" );
MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller" );
MODULE_LICENSE("GPL v2" );
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(vorverarbeitet am 2026-06-05)
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