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// SPDX-License-Identifier: GPL-2.0
/*
* Panel driver for the Samsung S6D27A1 480x800 DPI RGB panel.
* Found in the Samsung Galaxy Ace 2 GT-I8160 mobile phone.
*/
#include <drm/drm_mipi_dbi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/media-bus-format.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <video/mipi_display.h>
#define S6D27A1_PASSWD_L2 0xF0 /* Password Command for Level 2 Control */
#define S6D27A1_RESCTL 0xB3 /* Resolution Select Control */
#define S6D27A1_PANELCTL2 0xB4 /* ASG Signal Control */
#define S6D27A1_READID1 0xDA /* Read panel ID 1 */
#define S6D27A1_READID2 0xDB /* Read panel ID 2 */
#define S6D27A1_READID3 0xDC /* Read panel ID 3 */
#define S6D27A1_DISPCTL 0xF2 /* Display Control */
#define S6D27A1_MANPWR 0xF3 /* Manual Control */
#define S6D27A1_PWRCTL1 0xF4 /* Power Control */
#define S6D27A1_SRCCTL 0xF6 /* Source Control */
#define S6D27A1_PANELCTL 0xF7 /* Panel Control*/
static const u8 s6d27a1_dbi_read_commands[] = {
S6D27A1_READID1,
S6D27A1_READID2,
S6D27A1_READID3,
0, /* sentinel */
};
struct s6d27a1 {
struct device *dev;
struct mipi_dbi dbi;
struct drm_panel panel;
struct gpio_desc *reset;
struct regulator_bulk_data regulators[2];
};
static const struct drm_display_mode s6d27a1_480_800_mode = {
/*
* The vendor driver states that the S6D27A1 panel
* has a pixel clock frequency of 49920000 Hz / 2 = 24960000 Hz.
*/
.clock = 24960,
.hdisplay = 480,
.hsync_start = 480 + 63,
.hsync_end = 480 + 63 + 2,
.htotal = 480 + 63 + 2 + 63,
.vdisplay = 800,
.vsync_start = 800 + 11,
.vsync_end = 800 + 11 + 2,
.vtotal = 800 + 11 + 2 + 10,
.width_mm = 50,
.height_mm = 84,
.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
};
static inline struct s6d27a1 *to_s6d27a1(struct drm_panel *panel)
{
return container_of(panel, struct s6d27a1, panel);
}
static void s6d27a1_read_mtp_id(struct s6d27a1 *ctx)
{
struct mipi_dbi *dbi = &ctx->dbi;
u8 id1, id2, id3;
int ret;
ret = mipi_dbi_command_read(dbi, S6D27A1_READID1, &id1);
if (ret) {
dev_err(ctx->dev, "unable to read MTP ID 1\n");
return;
}
ret = mipi_dbi_command_read(dbi, S6D27A1_READID2, &id2);
if (ret) {
dev_err(ctx->dev, "unable to read MTP ID 2\n");
return;
}
ret = mipi_dbi_command_read(dbi, S6D27A1_READID3, &id3);
if (ret) {
dev_err(ctx->dev, "unable to read MTP ID 3\n");
return;
}
dev_info(ctx->dev, "MTP ID: %02x %02x %02x\n", id1, id2, id3);
}
static int s6d27a1_power_on(struct s6d27a1 *ctx)
{
struct mipi_dbi *dbi = &ctx->dbi;
int ret;
/* Power up */
ret = regulator_bulk_enable(ARRAY_SIZE(ctx->regulators),
ctx->regulators);
if (ret) {
dev_err(ctx->dev, "failed to enable regulators: %d\n", ret);
return ret;
}
msleep(20);
/* Assert reset >=1 ms */
gpiod_set_value_cansleep(ctx->reset, 1);
usleep_range(1000, 5000);
/* De-assert reset */
gpiod_set_value_cansleep(ctx->reset, 0);
/* Wait >= 10 ms */
msleep(20);
/*
* Exit sleep mode and initialize display - some hammering is
* necessary.
*/
mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
msleep(120);
/* Magic to unlock level 2 control of the display */
mipi_dbi_command(dbi, S6D27A1_PASSWD_L2, 0x5A, 0x5A);
/* Configure resolution to 480RGBx800 */
mipi_dbi_command(dbi, S6D27A1_RESCTL, 0x22);
mipi_dbi_command(dbi, S6D27A1_PANELCTL2, 0x00, 0x02, 0x03, 0x04, 0x05, 0x08, 0x00, 0x0c);
mipi_dbi_command(dbi, S6D27A1_MANPWR, 0x01, 0x00, 0x00, 0x08, 0x08, 0x02, 0x00);
mipi_dbi_command(dbi, S6D27A1_DISPCTL, 0x19, 0x00, 0x08, 0x0D, 0x03, 0x41, 0x3F);
mipi_dbi_command(dbi, S6D27A1_PWRCTL1, 0x00, 0x00, 0x00, 0x00, 0x55,
0x44, 0x05, 0x88, 0x4B, 0x50);
mipi_dbi_command(dbi, S6D27A1_SRCCTL, 0x03, 0x09, 0x8A, 0x00, 0x01, 0x16);
mipi_dbi_command(dbi, S6D27A1_PANELCTL, 0x00, 0x05, 0x06, 0x07, 0x08,
0x01, 0x09, 0x0D, 0x0A, 0x0E,
0x0B, 0x0F, 0x0C, 0x10, 0x01,
0x11, 0x12, 0x13, 0x14, 0x05,
0x06, 0x07, 0x08, 0x01, 0x09,
0x0D, 0x0A, 0x0E, 0x0B, 0x0F,
0x0C, 0x10, 0x01, 0x11, 0x12,
0x13, 0x14);
/* lock the level 2 control */
mipi_dbi_command(dbi, S6D27A1_PASSWD_L2, 0xA5, 0xA5);
s6d27a1_read_mtp_id(ctx);
return 0;
}
static int s6d27a1_power_off(struct s6d27a1 *ctx)
{
/* Go into RESET and disable regulators */
gpiod_set_value_cansleep(ctx->reset, 1);
return regulator_bulk_disable(ARRAY_SIZE(ctx->regulators),
ctx->regulators);
}
static int s6d27a1_unprepare(struct drm_panel *panel)
{
struct s6d27a1 *ctx = to_s6d27a1(panel);
struct mipi_dbi *dbi = &ctx->dbi;
mipi_dbi_command(dbi, MIPI_DCS_ENTER_SLEEP_MODE);
msleep(120);
return s6d27a1_power_off(to_s6d27a1(panel));
}
static int s6d27a1_disable(struct drm_panel *panel)
{
struct s6d27a1 *ctx = to_s6d27a1(panel);
struct mipi_dbi *dbi = &ctx->dbi;
mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
msleep(25);
return 0;
}
static int s6d27a1_prepare(struct drm_panel *panel)
{
return s6d27a1_power_on(to_s6d27a1(panel));
}
static int s6d27a1_enable(struct drm_panel *panel)
{
struct s6d27a1 *ctx = to_s6d27a1(panel);
struct mipi_dbi *dbi = &ctx->dbi;
mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
return 0;
}
static int s6d27a1_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct s6d27a1 *ctx = to_s6d27a1(panel);
struct drm_display_mode *mode;
static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
mode = drm_mode_duplicate(connector->dev, &s6d27a1_480_800_mode);
if (!mode) {
dev_err(ctx->dev, "failed to add mode\n");
return -ENOMEM;
}
connector->display_info.bpc = 8;
connector->display_info.width_mm = mode->width_mm;
connector->display_info.height_mm = mode->height_mm;
connector->display_info.bus_flags =
DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
drm_display_info_set_bus_formats(&connector->display_info,
&bus_format, 1);
drm_mode_set_name(mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
drm_mode_probed_add(connector, mode);
return 1;
}
static const struct drm_panel_funcs s6d27a1_drm_funcs = {
.disable = s6d27a1_disable,
.unprepare = s6d27a1_unprepare,
.prepare = s6d27a1_prepare,
.enable = s6d27a1_enable,
.get_modes = s6d27a1_get_modes,
};
static int s6d27a1_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct s6d27a1 *ctx;
int ret;
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->dev = dev;
/*
* VCI is the analog voltage supply
* VCCIO is the digital I/O voltage supply
*/
ctx->regulators[0].supply = "vci";
ctx->regulators[1].supply = "vccio";
ret = devm_regulator_bulk_get(dev,
ARRAY_SIZE(ctx->regulators),
ctx->regulators);
if (ret)
return dev_err_probe(dev, ret, "failed to get regulators\n");
ctx->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(ctx->reset)) {
ret = PTR_ERR(ctx->reset);
return dev_err_probe(dev, ret, "no RESET GPIO\n");
}
ret = mipi_dbi_spi_init(spi, &ctx->dbi, NULL);
if (ret)
return dev_err_probe(dev, ret, "MIPI DBI init failed\n");
ctx->dbi.read_commands = s6d27a1_dbi_read_commands;
drm_panel_init(&ctx->panel, dev, &s6d27a1_drm_funcs,
DRM_MODE_CONNECTOR_DPI);
ret = drm_panel_of_backlight(&ctx->panel);
if (ret)
return dev_err_probe(dev, ret, "failed to add backlight\n");
spi_set_drvdata(spi, ctx);
drm_panel_add(&ctx->panel);
return 0;
}
static void s6d27a1_remove(struct spi_device *spi)
{
struct s6d27a1 *ctx = spi_get_drvdata(spi);
drm_panel_remove(&ctx->panel);
}
static const struct of_device_id s6d27a1_match[] = {
{ .compatible = "samsung,s6d27a1", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, s6d27a1_match);
static struct spi_driver s6d27a1_driver = {
.probe = s6d27a1_probe,
.remove = s6d27a1_remove,
.driver = {
.name = "s6d27a1-panel",
.of_match_table = s6d27a1_match,
},
};
module_spi_driver(s6d27a1_driver);
MODULE_AUTHOR("Markuss Broks <markuss.broks@gmail.com>");
MODULE_DESCRIPTION("Samsung S6D27A1 panel driver");
MODULE_LICENSE("GPL v2");
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