aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/panel/panel-samsung-s6d27a1.c
diff options
context:
space:
mode:
authorMarkuss Broks <markuss.broks@gmail.com>2021-08-07 16:31:11 +0300
committerLinus Walleij <linus.walleij@linaro.org>2021-08-13 15:53:11 +0200
commitebd8cbf1fb968cb1c3e3cf7b26dfe2c1f201bdf0 (patch)
tree22f814ee4d4ab04eea038d7d6dbc53d1e2eb4226 /drivers/gpu/drm/panel/panel-samsung-s6d27a1.c
parentdrm/panel: Add DT bindings for Samsung S6D27A1 display panel (diff)
downloadlinux-dev-ebd8cbf1fb968cb1c3e3cf7b26dfe2c1f201bdf0.tar.xz
linux-dev-ebd8cbf1fb968cb1c3e3cf7b26dfe2c1f201bdf0.zip
drm/panel: s6d27a1: Add driver for Samsung S6D27A1 display panel
This adds a driver for Samsung S6D27A1 display controller and panel. This panel is found in the Samsung GT-I8160 mobile phone, and possibly some other mobile phones. This display needs manufacturer commands to configure it; the commands used in this driver were taken from downstream driver by Gareth Phillips; sadly, there is almost no documentation on what they actually do. This driver re-uses the DBI infrastructure to communicate with the display. This driver is heavily based on WideChips WS2401 display controller driver by Linus Walleij and on other panel drivers for reference. Signed-off-by: Markuss Broks <markuss.broks@gmail.com> [Up reset out time to 120 ms] Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20210807133111.5935-3-markuss.broks@gmail.com
Diffstat (limited to 'drivers/gpu/drm/panel/panel-samsung-s6d27a1.c')
-rw-r--r--drivers/gpu/drm/panel/panel-samsung-s6d27a1.c320
1 files changed, 320 insertions, 0 deletions
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 000000000000..1696ceb36aa0
--- /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");