diff --git a/MAINTAINERS b/MAINTAINERS
index 851255b71cccd18f69890243e19b6c242176c9f7..c363209130c0318b907807dda1d6d0974d2df56e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5962,6 +5962,12 @@ T: git git://anongit.freedesktop.org/drm/drm-misc
F: Documentation/devicetree/bindings/display/panel/samsung,lms397kf04.yaml
F: drivers/gpu/drm/panel/panel-samsung-db7430.c
+DRM DRIVER FOR SAMSUNG S6D27A1 PANELS
+M: Markuss Broks <markuss.broks@gmail.com>
+S: Maintained
+F: Documentation/devicetree/bindings/display/panel/samsung,s6d27a1.yaml
+F: driver/gpu/drm/panel/panel-samsung-s6d27a1.c
+
DRM DRIVER FOR SITRONIX ST7703 PANELS
M: Guido Günther <agx@sigxcpu.org>
R: Purism Kernel Team <kernel@puri.sm>
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index beb581b96ecdc6f9dbdbc64676137de854428cd4..0b37849413121252e5671e1eab106e413bc29fcf 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -392,6 +392,17 @@ config DRM_PANEL_SAMSUNG_S6D16D0
depends on DRM_MIPI_DSI
select VIDEOMODE_HELPERS
+config DRM_PANEL_SAMSUNG_S6D27A1
+ tristate "Samsung S6D27A1 DPI panel driver"
+ depends on OF && SPI && GPIOLIB
+ select DRM_MIPI_DBI
+ help
+ Say Y here if you want to enable support for the Samsung
+ S6D27A1 DPI 480x800 panel.
+
+ This panel can be found in Samsung Galaxy Ace 2
+ GT-I8160 mobile phone.
+
config DRM_PANEL_SAMSUNG_S6E3HA2
tristate "Samsung S6E3HA2 DSI video mode panel"
depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index c8132050bcec00efde64a27987f1f78d48affaf9..60c0149fc54af0a1e42ab887db2af7dbaa26928c 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20) += panel-samsung-atna33xc20.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
+obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D27A1) += panel-samsung-s6d27a1.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6d27a1.c b/drivers/gpu/drm/panel/panel-samsung-s6d27a1.c
new file mode 100644
index 0000000000000000000000000000000000000000..1696ceb36aa0227220a4e912fa5420da205fd389
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-samsung-s6d27a1.c
@@ -0,0 +1,320 @@
+// 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 int s6d27a1_remove(struct spi_device *spi)
+{
+ struct s6d27a1 *ctx = spi_get_drvdata(spi);
+
+ drm_panel_remove(&ctx->panel);
+ return 0;
+}
+
+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");