| // 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 void s6d16d0_remove(struct mipi_dsi_device *dsi) |
| { |
| struct s6d16d0 *s6 = mipi_dsi_get_drvdata(dsi); |
| |
| mipi_dsi_detach(dsi); |
| drm_panel_remove(&s6->panel); |
| } |
| |
| 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"); |