--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2016 InforceComputing
+ * Copyright (C) 2016 Linaro Ltd
+ * Copyright (C) 2023 BayLibre, SAS
+ *
+ * Authors:
+ * - Vinay Simha BN <simhavcs@gmail.com>
+ * - Sumit Semwal <sumit.semwal@linaro.org>
+ * - Guillaume La Roque <glaroque@baylibre.com>
+ *
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#define DSI_REG_MCAP 0xB0
+#define DSI_REG_IS 0xB3 /* Interface Setting */
+#define DSI_REG_IIS 0xB4 /* Interface ID Setting */
+#define DSI_REG_CTRL 0xB6
+
+enum {
+ IOVCC = 0,
+ POWER = 1
+};
+
+struct stk_panel {
+ bool prepared;
+ const struct drm_display_mode *mode;
+ struct backlight_device *backlight;
+ struct drm_panel base;
+ struct gpio_desc *enable_gpio; /* Power IC supply enable */
+ struct gpio_desc *reset_gpio; /* External reset */
+ struct mipi_dsi_device *dsi;
+ struct regulator_bulk_data supplies[2];
+};
+
+static inline struct stk_panel *to_stk_panel(struct drm_panel *panel)
+{
+ return container_of(panel, struct stk_panel, base);
+}
+
+static int stk_panel_init(struct stk_panel *stk)
+{
+ struct mipi_dsi_device *dsi = stk->dsi;
+ struct device *dev = &stk->dsi->dev;
+ int ret;
+
+ ret = mipi_dsi_dcs_soft_reset(dsi);
+ if (ret < 0) {
+ dev_err(dev, "failed to mipi_dsi_dcs_soft_reset: %d\n", ret);
+ return ret;
+ }
+ mdelay(5);
+
+ ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+ if (ret < 0) {
+ dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
+ return ret;
+ }
+ msleep(120);
+
+ mipi_dsi_generic_write_seq(dsi, DSI_REG_MCAP, 0x04);
+
+ /* Interface setting, video mode */
+ mipi_dsi_generic_write_seq(dsi, DSI_REG_IS, 0x14, 0x08, 0x00, 0x22, 0x00);
+ mipi_dsi_generic_write_seq(dsi, DSI_REG_IIS, 0x0C, 0x00);
+ mipi_dsi_generic_write_seq(dsi, DSI_REG_CTRL, 0x3A, 0xD3);
+
+ ret = mipi_dsi_dcs_set_display_brightness(dsi, 0x77);
+ if (ret < 0) {
+ dev_err(dev, "failed to write display brightness: %d\n", ret);
+ return ret;
+ }
+
+ mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
+ MIPI_DCS_WRITE_MEMORY_START);
+
+ ret = mipi_dsi_dcs_set_pixel_format(dsi, 0x77);
+ if (ret < 0) {
+ dev_err(dev, "failed to set pixel format: %d\n", ret);
+ return ret;
+ }
+
+ ret = mipi_dsi_dcs_set_column_address(dsi, 0, stk->mode->hdisplay - 1);
+ if (ret < 0) {
+ dev_err(dev, "failed to set column address: %d\n", ret);
+ return ret;
+ }
+
+ ret = mipi_dsi_dcs_set_page_address(dsi, 0, stk->mode->vdisplay - 1);
+ if (ret < 0) {
+ dev_err(dev, "failed to set page address: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int stk_panel_on(struct stk_panel *stk)
+{
+ struct mipi_dsi_device *dsi = stk->dsi;
+ struct device *dev = &stk->dsi->dev;
+ int ret;
+
+ ret = mipi_dsi_dcs_set_display_on(dsi);
+ if (ret < 0)
+ dev_err(dev, "failed to set display on: %d\n", ret);
+
+ mdelay(20);
+
+ return ret;
+}
+
+static void stk_panel_off(struct stk_panel *stk)
+{
+ struct mipi_dsi_device *dsi = stk->dsi;
+ struct device *dev = &stk->dsi->dev;
+ int ret;
+
+ dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+ ret = mipi_dsi_dcs_set_display_off(dsi);
+ if (ret < 0)
+ dev_err(dev, "failed to set display off: %d\n", ret);
+
+ ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+ if (ret < 0)
+ dev_err(dev, "failed to enter sleep mode: %d\n", ret);
+
+ msleep(100);
+}
+
+static int stk_panel_unprepare(struct drm_panel *panel)
+{
+ struct stk_panel *stk = to_stk_panel(panel);
+
+ if (!stk->prepared)
+ return 0;
+
+ stk_panel_off(stk);
+ regulator_bulk_disable(ARRAY_SIZE(stk->supplies), stk->supplies);
+ gpiod_set_value(stk->reset_gpio, 0);
+ gpiod_set_value(stk->enable_gpio, 1);
+
+ stk->prepared = false;
+
+ return 0;
+}
+
+static int stk_panel_prepare(struct drm_panel *panel)
+{
+ struct stk_panel *stk = to_stk_panel(panel);
+ struct device *dev = &stk->dsi->dev;
+ int ret;
+
+ if (stk->prepared)
+ return 0;
+
+ gpiod_set_value(stk->reset_gpio, 0);
+ gpiod_set_value(stk->enable_gpio, 0);
+ ret = regulator_enable(stk->supplies[IOVCC].consumer);
+ if (ret < 0)
+ return ret;
+
+ mdelay(8);
+ ret = regulator_enable(stk->supplies[POWER].consumer);
+ if (ret < 0)
+ goto iovccoff;
+
+ mdelay(20);
+ gpiod_set_value(stk->enable_gpio, 1);
+ mdelay(20);
+ gpiod_set_value(stk->reset_gpio, 1);
+ mdelay(10);
+ ret = stk_panel_init(stk);
+ if (ret < 0) {
+ dev_err(dev, "failed to init panel: %d\n", ret);
+ goto poweroff;
+ }
+
+ ret = stk_panel_on(stk);
+ if (ret < 0) {
+ dev_err(dev, "failed to set panel on: %d\n", ret);
+ goto poweroff;
+ }
+
+ stk->prepared = true;
+
+ return 0;
+
+poweroff:
+ regulator_disable(stk->supplies[POWER].consumer);
+iovccoff:
+ regulator_disable(stk->supplies[IOVCC].consumer);
+ gpiod_set_value(stk->reset_gpio, 0);
+ gpiod_set_value(stk->enable_gpio, 0);
+
+ return ret;
+}
+
+static const struct drm_display_mode default_mode = {
+ .clock = 163204,
+ .hdisplay = 1200,
+ .hsync_start = 1200 + 144,
+ .hsync_end = 1200 + 144 + 16,
+ .htotal = 1200 + 144 + 16 + 45,
+ .vdisplay = 1920,
+ .vsync_start = 1920 + 8,
+ .vsync_end = 1920 + 8 + 4,
+ .vtotal = 1920 + 8 + 4 + 4,
+ .width_mm = 95,
+ .height_mm = 151,
+};
+
+static int stk_panel_get_modes(struct drm_panel *panel,
+ struct drm_connector *connector)
+{
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(connector->dev, &default_mode);
+ if (!mode) {
+ dev_err(panel->dev, "failed to add mode %ux%ux@%u\n",
+ default_mode.hdisplay, default_mode.vdisplay,
+ drm_mode_vrefresh(&default_mode));
+ return -ENOMEM;
+ }
+
+ drm_mode_set_name(mode);
+ drm_mode_probed_add(connector, mode);
+ connector->display_info.width_mm = default_mode.width_mm;
+ connector->display_info.height_mm = default_mode.height_mm;
+ return 1;
+}
+
+static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
+{
+ struct mipi_dsi_device *dsi = bl_get_data(bl);
+ int ret;
+ u16 brightness;
+
+ dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+ ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
+ if (ret < 0)
+ return ret;
+
+ dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+ return brightness & 0xff;
+}
+
+static int dsi_dcs_bl_update_status(struct backlight_device *bl)
+{
+ struct mipi_dsi_device *dsi = bl_get_data(bl);
+ struct device *dev = &dsi->dev;
+ int ret;
+
+ dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+ ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
+ if (ret < 0) {
+ dev_err(dev, "failed to set DSI control: %d\n", ret);
+ return ret;
+ }
+
+ dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+ return 0;
+}
+
+static const struct backlight_ops dsi_bl_ops = {
+ .update_status = dsi_dcs_bl_update_status,
+ .get_brightness = dsi_dcs_bl_get_brightness,
+};
+
+static struct backlight_device *
+drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
+{
+ struct device *dev = &dsi->dev;
+ struct backlight_properties props = {
+ .type = BACKLIGHT_RAW,
+ .brightness = 255,
+ .max_brightness = 255,
+ };
+
+ return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+ &dsi_bl_ops, &props);
+}
+
+static const struct drm_panel_funcs stk_panel_funcs = {
+ .unprepare = stk_panel_unprepare,
+ .prepare = stk_panel_prepare,
+ .get_modes = stk_panel_get_modes,
+};
+
+static const struct of_device_id stk_of_match[] = {
+ { .compatible = "startek,kd070fhfid015", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, stk_of_match);
+
+static int stk_panel_add(struct stk_panel *stk)
+{
+ struct device *dev = &stk->dsi->dev;
+ int ret;
+
+ stk->mode = &default_mode;
+
+ stk->supplies[IOVCC].supply = "iovcc";
+ stk->supplies[POWER].supply = "power";
+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(stk->supplies), stk->supplies);
+ if (ret) {
+ dev_err(dev, "regulator_bulk failed\n");
+ return ret;
+ }
+
+ stk->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(stk->reset_gpio)) {
+ ret = PTR_ERR(stk->reset_gpio);
+ dev_err(dev, "cannot get reset-gpios %d\n", ret);
+ return ret;
+ }
+
+ stk->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
+ if (IS_ERR(stk->enable_gpio)) {
+ ret = PTR_ERR(stk->enable_gpio);
+ dev_err(dev, "cannot get enable-gpio %d\n", ret);
+ return ret;
+ }
+
+ stk->backlight = drm_panel_create_dsi_backlight(stk->dsi);
+ if (IS_ERR(stk->backlight)) {
+ ret = PTR_ERR(stk->backlight);
+ dev_err(dev, "failed to register backlight %d\n", ret);
+ return ret;
+ }
+
+ drm_panel_init(&stk->base, &stk->dsi->dev, &stk_panel_funcs,
+ DRM_MODE_CONNECTOR_DSI);
+
+ drm_panel_add(&stk->base);
+
+ return 0;
+}
+
+static int stk_panel_probe(struct mipi_dsi_device *dsi)
+{
+ struct stk_panel *stk;
+ int ret;
+
+ dsi->lanes = 4;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->mode_flags = (MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM);
+
+ stk = devm_kzalloc(&dsi->dev, sizeof(*stk), GFP_KERNEL);
+ if (!stk)
+ return -ENOMEM;
+
+ mipi_dsi_set_drvdata(dsi, stk);
+
+ stk->dsi = dsi;
+
+ ret = stk_panel_add(stk);
+ if (ret < 0)
+ return ret;
+
+ ret = mipi_dsi_attach(dsi);
+ if (ret < 0)
+ drm_panel_remove(&stk->base);
+
+ return 0;
+}
+
+static void stk_panel_remove(struct mipi_dsi_device *dsi)
+{
+ struct stk_panel *stk = mipi_dsi_get_drvdata(dsi);
+ int err;
+
+ err = mipi_dsi_detach(dsi);
+ if (err < 0)
+ dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
+ err);
+
+ drm_panel_remove(&stk->base);
+}
+
+static struct mipi_dsi_driver stk_panel_driver = {
+ .driver = {
+ .name = "panel-startek-kd070fhfid015",
+ .of_match_table = stk_of_match,
+ },
+ .probe = stk_panel_probe,
+ .remove = stk_panel_remove,
+};
+module_mipi_dsi_driver(stk_panel_driver);
+
+MODULE_AUTHOR("Guillaume La Roque <glaroque@baylibre.com>");
+MODULE_DESCRIPTION("STARTEK KD070FHFID015");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff