--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Raydium RM67191 MIPI-DSI panel driver
+ *
+ * Copyright 2019 NXP
+ */
+
+#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 <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+/* Panel specific color-format bits */
+#define COL_FMT_16BPP 0x55
+#define COL_FMT_18BPP 0x66
+#define COL_FMT_24BPP 0x77
+
+/* Write Manufacture Command Set Control */
+#define WRMAUCCTR 0xFE
+
+/* Manufacturer Command Set pages (CMD2) */
+struct cmd_set_entry {
+ u8 cmd;
+ u8 param;
+};
+
+/*
+ * There is no description in the Reference Manual about these commands.
+ * We received them from vendor, so just use them as is.
+ */
+static const struct cmd_set_entry manufacturer_cmd_set[] = {
+ {0xFE, 0x0B},
+ {0x28, 0x40},
+ {0x29, 0x4F},
+ {0xFE, 0x0E},
+ {0x4B, 0x00},
+ {0x4C, 0x0F},
+ {0x4D, 0x20},
+ {0x4E, 0x40},
+ {0x4F, 0x60},
+ {0x50, 0xA0},
+ {0x51, 0xC0},
+ {0x52, 0xE0},
+ {0x53, 0xFF},
+ {0xFE, 0x0D},
+ {0x18, 0x08},
+ {0x42, 0x00},
+ {0x08, 0x41},
+ {0x46, 0x02},
+ {0x72, 0x09},
+ {0xFE, 0x0A},
+ {0x24, 0x17},
+ {0x04, 0x07},
+ {0x1A, 0x0C},
+ {0x0F, 0x44},
+ {0xFE, 0x04},
+ {0x00, 0x0C},
+ {0x05, 0x08},
+ {0x06, 0x08},
+ {0x08, 0x08},
+ {0x09, 0x08},
+ {0x0A, 0xE6},
+ {0x0B, 0x8C},
+ {0x1A, 0x12},
+ {0x1E, 0xE0},
+ {0x29, 0x93},
+ {0x2A, 0x93},
+ {0x2F, 0x02},
+ {0x31, 0x02},
+ {0x33, 0x05},
+ {0x37, 0x2D},
+ {0x38, 0x2D},
+ {0x3A, 0x1E},
+ {0x3B, 0x1E},
+ {0x3D, 0x27},
+ {0x3F, 0x80},
+ {0x40, 0x40},
+ {0x41, 0xE0},
+ {0x4F, 0x2F},
+ {0x50, 0x1E},
+ {0xFE, 0x06},
+ {0x00, 0xCC},
+ {0x05, 0x05},
+ {0x07, 0xA2},
+ {0x08, 0xCC},
+ {0x0D, 0x03},
+ {0x0F, 0xA2},
+ {0x32, 0xCC},
+ {0x37, 0x05},
+ {0x39, 0x83},
+ {0x3A, 0xCC},
+ {0x41, 0x04},
+ {0x43, 0x83},
+ {0x44, 0xCC},
+ {0x49, 0x05},
+ {0x4B, 0xA2},
+ {0x4C, 0xCC},
+ {0x51, 0x03},
+ {0x53, 0xA2},
+ {0x75, 0xCC},
+ {0x7A, 0x03},
+ {0x7C, 0x83},
+ {0x7D, 0xCC},
+ {0x82, 0x02},
+ {0x84, 0x83},
+ {0x85, 0xEC},
+ {0x86, 0x0F},
+ {0x87, 0xFF},
+ {0x88, 0x00},
+ {0x8A, 0x02},
+ {0x8C, 0xA2},
+ {0x8D, 0xEA},
+ {0x8E, 0x01},
+ {0x8F, 0xE8},
+ {0xFE, 0x06},
+ {0x90, 0x0A},
+ {0x92, 0x06},
+ {0x93, 0xA0},
+ {0x94, 0xA8},
+ {0x95, 0xEC},
+ {0x96, 0x0F},
+ {0x97, 0xFF},
+ {0x98, 0x00},
+ {0x9A, 0x02},
+ {0x9C, 0xA2},
+ {0xAC, 0x04},
+ {0xFE, 0x06},
+ {0xB1, 0x12},
+ {0xB2, 0x17},
+ {0xB3, 0x17},
+ {0xB4, 0x17},
+ {0xB5, 0x17},
+ {0xB6, 0x11},
+ {0xB7, 0x08},
+ {0xB8, 0x09},
+ {0xB9, 0x06},
+ {0xBA, 0x07},
+ {0xBB, 0x17},
+ {0xBC, 0x17},
+ {0xBD, 0x17},
+ {0xBE, 0x17},
+ {0xBF, 0x17},
+ {0xC0, 0x17},
+ {0xC1, 0x17},
+ {0xC2, 0x17},
+ {0xC3, 0x17},
+ {0xC4, 0x0F},
+ {0xC5, 0x0E},
+ {0xC6, 0x00},
+ {0xC7, 0x01},
+ {0xC8, 0x10},
+ {0xFE, 0x06},
+ {0x95, 0xEC},
+ {0x8D, 0xEE},
+ {0x44, 0xEC},
+ {0x4C, 0xEC},
+ {0x32, 0xEC},
+ {0x3A, 0xEC},
+ {0x7D, 0xEC},
+ {0x75, 0xEC},
+ {0x00, 0xEC},
+ {0x08, 0xEC},
+ {0x85, 0xEC},
+ {0xA6, 0x21},
+ {0xA7, 0x05},
+ {0xA9, 0x06},
+ {0x82, 0x06},
+ {0x41, 0x06},
+ {0x7A, 0x07},
+ {0x37, 0x07},
+ {0x05, 0x06},
+ {0x49, 0x06},
+ {0x0D, 0x04},
+ {0x51, 0x04},
+};
+
+static const u32 rad_bus_formats[] = {
+ MEDIA_BUS_FMT_RGB888_1X24,
+ MEDIA_BUS_FMT_RGB666_1X18,
+ MEDIA_BUS_FMT_RGB565_1X16,
+};
+
+static const u32 rad_bus_flags = DRM_BUS_FLAG_DE_LOW |
+ DRM_BUS_FLAG_PIXDATA_NEGEDGE;
+
+struct rad_panel {
+ struct drm_panel panel;
+ struct mipi_dsi_device *dsi;
+
+ struct gpio_desc *reset;
+ struct backlight_device *backlight;
+
+ struct regulator_bulk_data *supplies;
+ unsigned int num_supplies;
+
+ bool prepared;
+ bool enabled;
+};
+
+static const struct drm_display_mode default_mode = {
+ .clock = 132000,
+ .hdisplay = 1080,
+ .hsync_start = 1080 + 20,
+ .hsync_end = 1080 + 20 + 2,
+ .htotal = 1080 + 20 + 2 + 34,
+ .vdisplay = 1920,
+ .vsync_start = 1920 + 10,
+ .vsync_end = 1920 + 10 + 2,
+ .vtotal = 1920 + 10 + 2 + 4,
+ .vrefresh = 60,
+ .width_mm = 68,
+ .height_mm = 121,
+ .flags = DRM_MODE_FLAG_NHSYNC |
+ DRM_MODE_FLAG_NVSYNC,
+};
+
+static inline struct rad_panel *to_rad_panel(struct drm_panel *panel)
+{
+ return container_of(panel, struct rad_panel, panel);
+}
+
+static int rad_panel_push_cmd_list(struct mipi_dsi_device *dsi)
+{
+ size_t i;
+ size_t count = ARRAY_SIZE(manufacturer_cmd_set);
+ int ret = 0;
+
+ for (i = 0; i < count; i++) {
+ const struct cmd_set_entry *entry = &manufacturer_cmd_set[i];
+ u8 buffer[2] = { entry->cmd, entry->param };
+
+ ret = mipi_dsi_generic_write(dsi, &buffer, sizeof(buffer));
+ if (ret < 0)
+ return ret;
+ }
+
+ return ret;
+};
+
+static int color_format_from_dsi_format(enum mipi_dsi_pixel_format format)
+{
+ switch (format) {
+ case MIPI_DSI_FMT_RGB565:
+ return COL_FMT_16BPP;
+ case MIPI_DSI_FMT_RGB666:
+ case MIPI_DSI_FMT_RGB666_PACKED:
+ return COL_FMT_18BPP;
+ case MIPI_DSI_FMT_RGB888:
+ return COL_FMT_24BPP;
+ default:
+ return COL_FMT_24BPP; /* for backward compatibility */
+ }
+};
+
+static int rad_panel_prepare(struct drm_panel *panel)
+{
+ struct rad_panel *rad = to_rad_panel(panel);
+ int ret;
+
+ if (rad->prepared)
+ return 0;
+
+ ret = regulator_bulk_enable(rad->num_supplies, rad->supplies);
+ if (ret)
+ return ret;
+
+ if (rad->reset) {
+ gpiod_set_value_cansleep(rad->reset, 1);
+ usleep_range(3000, 5000);
+ gpiod_set_value_cansleep(rad->reset, 0);
+ usleep_range(18000, 20000);
+ }
+
+ rad->prepared = true;
+
+ return 0;
+}
+
+static int rad_panel_unprepare(struct drm_panel *panel)
+{
+ struct rad_panel *rad = to_rad_panel(panel);
+ int ret;
+
+ if (!rad->prepared)
+ return 0;
+
+ /*
+ * Right after asserting the reset, we need to release it, so that the
+ * touch driver can have an active connection with the touch controller
+ * even after the display is turned off.
+ */
+ if (rad->reset) {
+ gpiod_set_value_cansleep(rad->reset, 1);
+ usleep_range(15000, 17000);
+ gpiod_set_value_cansleep(rad->reset, 0);
+ }
+
+ ret = regulator_bulk_disable(rad->num_supplies, rad->supplies);
+ if (ret)
+ return ret;
+
+ rad->prepared = false;
+
+ return 0;
+}
+
+static int rad_panel_enable(struct drm_panel *panel)
+{
+ struct rad_panel *rad = to_rad_panel(panel);
+ struct mipi_dsi_device *dsi = rad->dsi;
+ struct device *dev = &dsi->dev;
+ int color_format = color_format_from_dsi_format(dsi->format);
+ int ret;
+
+ if (rad->enabled)
+ return 0;
+
+ dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+ ret = rad_panel_push_cmd_list(dsi);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "Failed to send MCS (%d)\n", ret);
+ goto fail;
+ }
+
+ /* Select User Command Set table (CMD1) */
+ ret = mipi_dsi_generic_write(dsi, (u8[]){ WRMAUCCTR, 0x00 }, 2);
+ if (ret < 0)
+ goto fail;
+
+ /* Software reset */
+ ret = mipi_dsi_dcs_soft_reset(dsi);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "Failed to do Software Reset (%d)\n", ret);
+ goto fail;
+ }
+
+ usleep_range(15000, 17000);
+
+ /* Set DSI mode */
+ ret = mipi_dsi_generic_write(dsi, (u8[]){ 0xC2, 0x0B }, 2);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "Failed to set DSI mode (%d)\n", ret);
+ goto fail;
+ }
+ /* Set tear ON */
+ ret = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "Failed to set tear ON (%d)\n", ret);
+ goto fail;
+ }
+ /* Set tear scanline */
+ ret = mipi_dsi_dcs_set_tear_scanline(dsi, 0x380);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "Failed to set tear scanline (%d)\n", ret);
+ goto fail;
+ }
+ /* Set pixel format */
+ ret = mipi_dsi_dcs_set_pixel_format(dsi, color_format);
+ DRM_DEV_DEBUG_DRIVER(dev, "Interface color format set to 0x%x\n",
+ color_format);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "Failed to set pixel format (%d)\n", ret);
+ goto fail;
+ }
+ /* Exit sleep mode */
+ ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "Failed to exit sleep mode (%d)\n", ret);
+ goto fail;
+ }
+
+ usleep_range(5000, 7000);
+
+ ret = mipi_dsi_dcs_set_display_on(dsi);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "Failed to set display ON (%d)\n", ret);
+ goto fail;
+ }
+
+ backlight_enable(rad->backlight);
+
+ rad->enabled = true;
+
+ return 0;
+
+fail:
+ gpiod_set_value_cansleep(rad->reset, 1);
+
+ return ret;
+}
+
+static int rad_panel_disable(struct drm_panel *panel)
+{
+ struct rad_panel *rad = to_rad_panel(panel);
+ struct mipi_dsi_device *dsi = rad->dsi;
+ struct device *dev = &dsi->dev;
+ int ret;
+
+ if (!rad->enabled)
+ return 0;
+
+ dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+ backlight_disable(rad->backlight);
+
+ usleep_range(10000, 12000);
+
+ ret = mipi_dsi_dcs_set_display_off(dsi);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "Failed to set display OFF (%d)\n", ret);
+ return ret;
+ }
+
+ usleep_range(5000, 10000);
+
+ ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "Failed to enter sleep mode (%d)\n", ret);
+ return ret;
+ }
+
+ rad->enabled = false;
+
+ return 0;
+}
+
+static int rad_panel_get_modes(struct drm_panel *panel)
+{
+ struct drm_connector *connector = panel->connector;
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(panel->drm, &default_mode);
+ if (!mode) {
+ DRM_DEV_ERROR(panel->dev, "failed to add mode %ux%ux@%u\n",
+ default_mode.hdisplay, default_mode.vdisplay,
+ default_mode.vrefresh);
+ return -ENOMEM;
+ }
+
+ drm_mode_set_name(mode);
+ mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+ drm_mode_probed_add(panel->connector, mode);
+
+ connector->display_info.width_mm = mode->width_mm;
+ connector->display_info.height_mm = mode->height_mm;
+ connector->display_info.bus_flags = rad_bus_flags;
+
+ drm_display_info_set_bus_formats(&connector->display_info,
+ rad_bus_formats,
+ ARRAY_SIZE(rad_bus_formats));
+ return 1;
+}
+
+static int rad_bl_get_brightness(struct backlight_device *bl)
+{
+ struct mipi_dsi_device *dsi = bl_get_data(bl);
+ struct rad_panel *rad = mipi_dsi_get_drvdata(dsi);
+ u16 brightness;
+ int ret;
+
+ if (!rad->prepared)
+ return 0;
+
+ dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+ ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
+ if (ret < 0)
+ return ret;
+
+ bl->props.brightness = brightness;
+
+ return brightness & 0xff;
+}
+
+static int rad_bl_update_status(struct backlight_device *bl)
+{
+ struct mipi_dsi_device *dsi = bl_get_data(bl);
+ struct rad_panel *rad = mipi_dsi_get_drvdata(dsi);
+ int ret = 0;
+
+ if (!rad->prepared)
+ return 0;
+
+ dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+ ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static const struct backlight_ops rad_bl_ops = {
+ .update_status = rad_bl_update_status,
+ .get_brightness = rad_bl_get_brightness,
+};
+
+static const struct drm_panel_funcs rad_panel_funcs = {
+ .prepare = rad_panel_prepare,
+ .unprepare = rad_panel_unprepare,
+ .enable = rad_panel_enable,
+ .disable = rad_panel_disable,
+ .get_modes = rad_panel_get_modes,
+};
+
+static const char * const rad_supply_names[] = {
+ "v3p3",
+ "v1p8",
+};
+
+static int rad_init_regulators(struct rad_panel *rad)
+{
+ struct device *dev = &rad->dsi->dev;
+ int i;
+
+ rad->num_supplies = ARRAY_SIZE(rad_supply_names);
+ rad->supplies = devm_kcalloc(dev, rad->num_supplies,
+ sizeof(*rad->supplies), GFP_KERNEL);
+ if (!rad->supplies)
+ return -ENOMEM;
+
+ for (i = 0; i < rad->num_supplies; i++)
+ rad->supplies[i].supply = rad_supply_names[i];
+
+ return devm_regulator_bulk_get(dev, rad->num_supplies, rad->supplies);
+};
+
+static int rad_panel_probe(struct mipi_dsi_device *dsi)
+{
+ struct device *dev = &dsi->dev;
+ struct device_node *np = dev->of_node;
+ struct rad_panel *panel;
+ struct backlight_properties bl_props;
+ int ret;
+ u32 video_mode;
+
+ panel = devm_kzalloc(&dsi->dev, sizeof(*panel), GFP_KERNEL);
+ if (!panel)
+ return -ENOMEM;
+
+ mipi_dsi_set_drvdata(dsi, panel);
+
+ panel->dsi = dsi;
+
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
+ MIPI_DSI_CLOCK_NON_CONTINUOUS;
+
+ ret = of_property_read_u32(np, "video-mode", &video_mode);
+ if (!ret) {
+ switch (video_mode) {
+ case 0:
+ /* burst mode */
+ dsi->mode_flags |= MIPI_DSI_MODE_VIDEO_BURST;
+ break;
+ case 1:
+ /* non-burst mode with sync event */
+ break;
+ case 2:
+ /* non-burst mode with sync pulse */
+ dsi->mode_flags |= MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+ break;
+ default:
+ dev_warn(dev, "invalid video mode %d\n", video_mode);
+ break;
+ }
+ }
+
+ ret = of_property_read_u32(np, "dsi-lanes", &dsi->lanes);
+ if (ret) {
+ dev_err(dev, "Failed to get dsi-lanes property (%d)\n", ret);
+ return ret;
+ }
+
+ panel->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(panel->reset))
+ return PTR_ERR(panel->reset);
+
+ memset(&bl_props, 0, sizeof(bl_props));
+ bl_props.type = BACKLIGHT_RAW;
+ bl_props.brightness = 255;
+ bl_props.max_brightness = 255;
+
+ panel->backlight = devm_backlight_device_register(dev, dev_name(dev),
+ dev, dsi, &rad_bl_ops,
+ &bl_props);
+ if (IS_ERR(panel->backlight)) {
+ ret = PTR_ERR(panel->backlight);
+ dev_err(dev, "Failed to register backlight (%d)\n", ret);
+ return ret;
+ }
+
+ ret = rad_init_regulators(panel);
+ if (ret)
+ return ret;
+
+ drm_panel_init(&panel->panel);
+ panel->panel.funcs = &rad_panel_funcs;
+ panel->panel.dev = dev;
+ dev_set_drvdata(dev, panel);
+
+ ret = drm_panel_add(&panel->panel);
+ if (ret)
+ return ret;
+
+ ret = mipi_dsi_attach(dsi);
+ if (ret)
+ drm_panel_remove(&panel->panel);
+
+ return ret;
+}
+
+static int rad_panel_remove(struct mipi_dsi_device *dsi)
+{
+ struct rad_panel *rad = mipi_dsi_get_drvdata(dsi);
+ struct device *dev = &dsi->dev;
+ int ret;
+
+ ret = mipi_dsi_detach(dsi);
+ if (ret)
+ DRM_DEV_ERROR(dev, "Failed to detach from host (%d)\n",
+ ret);
+
+ drm_panel_remove(&rad->panel);
+
+ return 0;
+}
+
+static void rad_panel_shutdown(struct mipi_dsi_device *dsi)
+{
+ struct rad_panel *rad = mipi_dsi_get_drvdata(dsi);
+
+ rad_panel_disable(&rad->panel);
+ rad_panel_unprepare(&rad->panel);
+}
+
+static const struct of_device_id rad_of_match[] = {
+ { .compatible = "raydium,rm67191", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rad_of_match);
+
+static struct mipi_dsi_driver rad_panel_driver = {
+ .driver = {
+ .name = "panel-raydium-rm67191",
+ .of_match_table = rad_of_match,
+ },
+ .probe = rad_panel_probe,
+ .remove = rad_panel_remove,
+ .shutdown = rad_panel_shutdown,
+};
+module_mipi_dsi_driver(rad_panel_driver);
+
+MODULE_AUTHOR("Robert Chiras <robert.chiras@nxp.com>");
+MODULE_DESCRIPTION("DRM Driver for Raydium RM67191 MIPI DSI panel");
+MODULE_LICENSE("GPL v2");
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