--- /dev/null
+// 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 <drm/drm_print.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,
+ /*
+ * This depends on the clocking HS vs LP rate, this value
+ * is calculated as:
+ * vrefresh = (clock * 1000) / (htotal*vtotal)
+ */
+ .vrefresh = 816,
+ .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) {
+ DRM_DEV_ERROR(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) {
+ DRM_DEV_ERROR(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) {
+ DRM_DEV_ERROR(s6->dev, "failed to enble vblank TE (%d)\n",
+ ret);
+ return ret;
+ }
+ /* Exit sleep mode and power on */
+ ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+ if (ret) {
+ DRM_DEV_ERROR(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) {
+ DRM_DEV_ERROR(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) {
+ DRM_DEV_ERROR(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 = panel->connector;
+ struct drm_display_mode *mode;
+
+ strncpy(connector->display_info.name, "Samsung S6D16D0\0",
+ DRM_DISPLAY_INFO_LEN);
+
+ mode = drm_mode_duplicate(panel->drm, &samsung_s6d16d0_mode);
+ if (!mode) {
+ DRM_ERROR("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 |
+ MIPI_DSI_MODE_EOT_PACKET;
+
+ 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)
+ DRM_DEV_ERROR(dev, "failed to request GPIO (%d)\n",
+ ret);
+ return ret;
+ }
+
+ drm_panel_init(&s6->panel);
+ s6->panel.dev = dev;
+ s6->panel.funcs = &s6d16d0_drm_funcs;
+
+ ret = drm_panel_add(&s6->panel);
+ if (ret < 0)
+ return ret;
+
+ 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");
projects / linux.git / commitdiff