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// SPDX-License-Identifier: GPL-2.0+
/*
* MIPI-DSI Samsung s6d16d0 panel driver. This is a 864x480
* AMOLED panel with a command-only DSI interface.
*/
#include <drm/drm_modes.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
#include <linux/delay.h>
#include <linux/of_device.h>
#include <linux/module.h>
struct s6d16d0 {
struct device *dev;
struct drm_panel panel;
struct regulator *supply;
struct gpio_desc *reset_gpio;
};
/*
* The timings are not very helpful as the display is used in
* command mode.
*/
static const struct drm_display_mode samsung_s6d16d0_mode = {
/* HS clock, (htotal*vtotal*vrefresh)/1000 */
.clock = 420160,
.hdisplay = 864,
.hsync_start = 864 + 154,
.hsync_end = 864 + 154 + 16,
.htotal = 864 + 154 + 16 + 32,
.vdisplay = 480,
.vsync_start = 480 + 1,
.vsync_end = 480 + 1 + 1,
.vtotal = 480 + 1 + 1 + 1,
.width_mm = 84,
.height_mm = 48,
};
static inline struct s6d16d0 *panel_to_s6d16d0(struct drm_panel *panel)
{
return container_of(panel, struct s6d16d0, panel);
}
static int s6d16d0_unprepare(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
/* Enter sleep mode */
ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
if (ret) {
dev_err(s6->dev, "failed to enter sleep mode (%d)\n", ret);
return ret;
}
/* Assert RESET */
gpiod_set_value_cansleep(s6->reset_gpio, 1);
regulator_disable(s6->supply);
return 0;
}
static int s6d16d0_prepare(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
ret = regulator_enable(s6->supply);
if (ret) {
dev_err(s6->dev, "failed to enable supply (%d)\n", ret);
return ret;
}
/* Assert RESET */
gpiod_set_value_cansleep(s6->reset_gpio, 1);
udelay(10);
/* De-assert RESET */
gpiod_set_value_cansleep(s6->reset_gpio, 0);
msleep(120);
/* Enabe tearing mode: send TE (tearing effect) at VBLANK */
ret = mipi_dsi_dcs_set_tear_on(dsi,
MIPI_DSI_DCS_TEAR_MODE_VBLANK);
if (ret) {
dev_err(s6->dev, "failed to enable vblank TE (%d)\n", ret);
return ret;
}
/* Exit sleep mode and power on */
ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
if (ret) {
dev_err(s6->dev, "failed to exit sleep mode (%d)\n", ret);
return ret;
}
return 0;
}
static int s6d16d0_enable(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
ret = mipi_dsi_dcs_set_display_on(dsi);
if (ret) {
dev_err(s6->dev, "failed to turn display on (%d)\n", ret);
return ret;
}
return 0;
}
static int s6d16d0_disable(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
ret = mipi_dsi_dcs_set_display_off(dsi);
if (ret) {
dev_err(s6->dev, "failed to turn display off (%d)\n", ret);
return ret;
}
return 0;
}
static int s6d16d0_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &samsung_s6d16d0_mode);
if (!mode) {
dev_err(panel->dev, "bad mode or failed to add mode\n");
return -EINVAL;
}
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; /* Number of modes */
}
static const struct drm_panel_funcs s6d16d0_drm_funcs = {
.disable = s6d16d0_disable,
.unprepare = s6d16d0_unprepare,
.prepare = s6d16d0_prepare,
.enable = s6d16d0_enable,
.get_modes = s6d16d0_get_modes,
};
static int s6d16d0_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
struct s6d16d0 *s6;
int ret;
s6 = devm_kzalloc(dev, sizeof(struct s6d16d0), GFP_KERNEL);
if (!s6)
return -ENOMEM;
mipi_dsi_set_drvdata(dsi, s6);
s6->dev = dev;
dsi->lanes = 2;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->hs_rate = 420160000;
dsi->lp_rate = 19200000;
/*
* This display uses command mode so no MIPI_DSI_MODE_VIDEO
* or MIPI_DSI_MODE_VIDEO_SYNC_PULSE
*
* As we only send commands we do not need to be continuously
* clocked.
*/
dsi->mode_flags = MIPI_DSI_CLOCK_NON_CONTINUOUS;
s6->supply = devm_regulator_get(dev, "vdd1");
if (IS_ERR(s6->supply))
return PTR_ERR(s6->supply);
/* This asserts RESET by default */
s6->reset_gpio = devm_gpiod_get_optional(dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(s6->reset_gpio)) {
ret = PTR_ERR(s6->reset_gpio);
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to request GPIO (%d)\n", ret);
return ret;
}
drm_panel_init(&s6->panel, dev, &s6d16d0_drm_funcs,
DRM_MODE_CONNECTOR_DSI);
drm_panel_add(&s6->panel);
ret = mipi_dsi_attach(dsi);
if (ret < 0)
drm_panel_remove(&s6->panel);
return ret;
}
static int s6d16d0_remove(struct mipi_dsi_device *dsi)
{
struct s6d16d0 *s6 = mipi_dsi_get_drvdata(dsi);
mipi_dsi_detach(dsi);
drm_panel_remove(&s6->panel);
return 0;
}
static const struct of_device_id s6d16d0_of_match[] = {
{ .compatible = "samsung,s6d16d0" },
{ }
};
MODULE_DEVICE_TABLE(of, s6d16d0_of_match);
static struct mipi_dsi_driver s6d16d0_driver = {
.probe = s6d16d0_probe,
.remove = s6d16d0_remove,
.driver = {
.name = "panel-samsung-s6d16d0",
.of_match_table = s6d16d0_of_match,
},
};
module_mipi_dsi_driver(s6d16d0_driver);
MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>");
MODULE_DESCRIPTION("MIPI-DSI s6d16d0 Panel Driver");
MODULE_LICENSE("GPL v2");
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