On 10.07.2017 11:02, Philippe CORNU wrote:
> This patch adds Orise Tech otm8009a 3.97" 480x800 TFT LCD
> panel driver (MIPI-DSI video mode). The panel backlight is
> managed through the DSI link. This panel driver is used in
> several STM32 boards.
>
> Signed-off-by: Philippe CORNU <philippe.cornu@xxxxxx>
> ---
> drivers/gpu/drm/panel/Kconfig | 9 +
> drivers/gpu/drm/panel/Makefile | 1 +
> drivers/gpu/drm/panel/panel-orisetech-otm8009a.c | 489 +++++++++++++++++++++++
> 3 files changed, 499 insertions(+)
> create mode 100755 drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index d84a031..c1c9291 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -117,4 +117,13 @@ config DRM_PANEL_SITRONIX_ST7789V
> Say Y here if you want to enable support for the Sitronix
> ST7789V controller for 240x320 LCD panels
>
> +config DRM_PANEL_ORISETECH_OTM8009A
> + tristate "Orise Tech otm8009a 480p dsi 2dl video mode panel"
> + depends on OF
> + depends on DRM_MIPI_DSI
> + depends on BACKLIGHT_CLASS_DEVICE
> + help
> + Say Y here if you want to enable support for Orise Tech OTM8009A
> + 480x800 DSI panel
> +
> endmenu
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 9f6610d..ac798f3 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -10,3 +10,4 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
> obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
> obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
> obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
> +obj-$(CONFIG_DRM_PANEL_ORISETECH_OTM8009A) += panel-orisetech-otm8009a.o
> \ No newline at end of file
Alphabetical order and new line at EOF.
> diff --git a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
> new file mode 100755
> index 0000000..2a3ce47
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
> @@ -0,0 +1,489 @@
> +/*
> + * Copyright (C) STMicroelectronics SA 2017
> + *
> + * Authors: Philippe Cornu <philippe.cornu@xxxxxx>
> + * Yannick Fertre <yannick.fertre@xxxxxx>
> + *
> + * License terms: GNU General Public License (GPL), version 2
> + */
> +#include <drm/drmP.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_panel.h>
> +#include <linux/backlight.h>
> +#include <linux/gpio/consumer.h>
> +#include <video/mipi_display.h>
> +
> +#define DRV_NAME "orisetech_otm8009a"
> +
> +#define OTM8009A_BACKLIGHT_DEFAULT 240
> +#define OTM8009A_BACKLIGHT_MAX 255
> +
> +/* Manufacturer Command Set */
> +#define MCS_ADRSFT 0x0000 /* Address Shift Function */
> +#define MCS_PANSET 0xB3A6 /* Panel Type Setting */
> +#define MCS_SD_CTRL 0xC0A2 /* Source Driver Timing Setting */
> +#define MCS_P_DRV_M 0xC0B4 /* Panel Driving Mode */
> +#define MCS_OSC_ADJ 0xC181 /* Oscillator Adjustment for Idle/Normal mode */
> +#define MCS_RGB_VID_SET 0xC1A1 /* RGB Video Mode Setting */
> +#define MCS_SD_PCH_CTRL 0xC480 /* Source Driver Precharge Control */
> +#define MCS_NO_DOC1 0xC48A /* Command not documented */
> +#define MCS_PWR_CTRL1 0xC580 /* Power Control Setting 1 */
> +#define MCS_PWR_CTRL2 0xC590 /* Power Control Setting 2 for Normal Mode */
> +#define MCS_PWR_CTRL4 0xC5B0 /* Power Control Setting 4 for DC Voltage */
> +#define MCS_PANCTRLSET1 0xCB80 /* Panel Control Setting 1 */
> +#define MCS_PANCTRLSET2 0xCB90 /* Panel Control Setting 2 */
> +#define MCS_PANCTRLSET3 0xCBA0 /* Panel Control Setting 3 */
> +#define MCS_PANCTRLSET4 0xCBB0 /* Panel Control Setting 4 */
> +#define MCS_PANCTRLSET5 0xCBC0 /* Panel Control Setting 5 */
> +#define MCS_PANCTRLSET6 0xCBD0 /* Panel Control Setting 6 */
> +#define MCS_PANCTRLSET7 0xCBE0 /* Panel Control Setting 7 */
> +#define MCS_PANCTRLSET8 0xCBF0 /* Panel Control Setting 8 */
> +#define MCS_PANU2D1 0xCC80 /* Panel U2D Setting 1 */
> +#define MCS_PANU2D2 0xCC90 /* Panel U2D Setting 2 */
> +#define MCS_PANU2D3 0xCCA0 /* Panel U2D Setting 3 */
> +#define MCS_PAND2U1 0xCCB0 /* Panel D2U Setting 1 */
> +#define MCS_PAND2U2 0xCCC0 /* Panel D2U Setting 2 */
> +#define MCS_PAND2U3 0xCCD0 /* Panel D2U Setting 3 */
> +#define MCS_GOAVST 0xCE80 /* GOA VST Setting */
> +#define MCS_GOACLKA1 0xCEA0 /* GOA CLKA1 Setting */
> +#define MCS_GOACLKA3 0xCEB0 /* GOA CLKA3 Setting */
> +#define MCS_GOAECLK 0xCFC0 /* GOA ECLK Setting */
> +#define MCS_NO_DOC2 0xCFD0 /* Command not documented */
> +#define MCS_GVDDSET 0xD800 /* GVDD/NGVDD */
> +#define MCS_VCOMDC 0xD900 /* VCOM Voltage Setting */
> +#define MCS_GMCT2_2P 0xE100 /* Gamma Correction 2.2+ Setting */
> +#define MCS_GMCT2_2N 0xE200 /* Gamma Correction 2.2- Setting */
> +#define MCS_NO_DOC3 0xF5B6 /* Command not documented */
> +#define MCS_CMD2_ENA1 0xFF00 /* Enable Access Command2 "CMD2" */
> +#define MCS_CMD2_ENA2 0xFF80 /* Enable Access Orise Command2 */
> +
> +struct otm8009a {
> + struct device *dev;
> + struct drm_panel panel;
> + struct backlight_device *bl_dev;
> + struct gpio_desc *reset_gpio;
> + bool prepared;
> + bool enabled;
> +};
> +
> +static const struct drm_display_mode default_mode = {
> + .clock = 32729,
> + .hdisplay = 480,
> + .hsync_start = 480 + 120,
> + .hsync_end = 480 + 120 + 63,
> + .htotal = 480 + 120 + 63 + 120,
> + .vdisplay = 800,
> + .vsync_start = 800 + 12,
> + .vsync_end = 800 + 12 + 12,
> + .vtotal = 800 + 12 + 12 + 12,
> + .vrefresh = 50,
> + .flags = 0,
> + .width_mm = 52,
> + .height_mm = 86,
> +};
> +
> +static inline struct otm8009a *panel_to_otm8009a(struct drm_panel *panel)
> +{
> + return container_of(panel, struct otm8009a, panel);
> +}
> +
> +static void otm8009a_dcs_write_buf(struct otm8009a *ctx, const void *data,
> + size_t len)
> +{
> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> +
> + if (mipi_dsi_dcs_write_buffer(dsi, data, len) < 0)
> + DRM_WARN("mipi dsi dcs write buffer failed\n");
> +}
> +
> +#define dcs_write_seq(ctx, seq...) \
> +({ \
> + static const u8 d[] = { seq }; \
> + otm8009a_dcs_write_buf(ctx, d, ARRAY_SIZE(d)); \
> +})
> +
> +#define dcs_write_cmd_at(ctx, cmd, seq...) \
> +({ \
> + dcs_write_seq(ctx, MCS_ADRSFT, (cmd) & 0xFF); \
> + dcs_write_seq(ctx, (cmd) >> 8, seq); \
> +})
This approach looks better than my proposition, for sure it is more
consistent with documentation.
> +
> +static int otm8009a_init_sequence(struct otm8009a *ctx)
> +{
> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> + int ret;
> +
> + /* Enter CMD2 */
> + dcs_write_cmd_at(ctx, MCS_CMD2_ENA1, 0x80, 0x09, 0x01);
> +
> + /* Enter Orise Command2 */
> + dcs_write_cmd_at(ctx, MCS_CMD2_ENA2, 0x80, 0x09);
> +
> + dcs_write_cmd_at(ctx, MCS_SD_PCH_CTRL, 0x30);
> + mdelay(10);
> +
> + dcs_write_cmd_at(ctx, MCS_NO_DOC1, 0x40);
> + mdelay(10);
> +
> + dcs_write_cmd_at(ctx, MCS_PWR_CTRL4 + 1, 0xA9);
> + dcs_write_cmd_at(ctx, MCS_PWR_CTRL2 + 1, 0x34);
> + dcs_write_cmd_at(ctx, MCS_P_DRV_M, 0x50);
> + dcs_write_cmd_at(ctx, MCS_VCOMDC, 0x4E);
> + dcs_write_cmd_at(ctx, MCS_OSC_ADJ, 0x66); /* 65Hz */
> + dcs_write_cmd_at(ctx, MCS_RGB_VID_SET, 0x08);
> + dcs_write_cmd_at(ctx, MCS_PWR_CTRL2 + 2, 0x01);
> + dcs_write_cmd_at(ctx, MCS_PWR_CTRL2 + 5, 0x34);
> + dcs_write_cmd_at(ctx, MCS_PWR_CTRL2 + 4, 0x33);
> + dcs_write_cmd_at(ctx, MCS_GVDDSET, 0x79, 0x79);
> + dcs_write_cmd_at(ctx, MCS_SD_CTRL + 1, 0x1B);
> + dcs_write_cmd_at(ctx, MCS_PWR_CTRL1 + 2, 0x83);
> + dcs_write_cmd_at(ctx, MCS_SD_PCH_CTRL + 1, 0x83);
> + dcs_write_cmd_at(ctx, MCS_RGB_VID_SET, 0x0E); /* FIXME before 0x08! */
Quite cryptic comment, either remove, either make it readable.
> + dcs_write_cmd_at(ctx, MCS_PANSET, 0x00, 0x01);
> +
> + dcs_write_cmd_at(ctx, MCS_GOAVST, 0x85, 0x01, 0x00, 0x84, 0x01, 0x00);
> + dcs_write_cmd_at(ctx, MCS_GOACLKA1, 0x18, 0x04, 0x03, 0x39, 0x00, 0x00,
> + 0x00, 0x18, 0x03, 0x03, 0x3A, 0x00, 0x00, 0x00);
> + dcs_write_cmd_at(ctx, MCS_GOACLKA3, 0x18, 0x02, 0x03, 0x3B, 0x00, 0x00,
> + 0x00, 0x18, 0x01, 0x03, 0x3C, 0x00, 0x00, 0x00);
> + dcs_write_cmd_at(ctx, MCS_GOAECLK, 0x01, 0x01, 0x20, 0x20, 0x00, 0x00,
> + 0x01, 0x02, 0x00, 0x00);
> +
> + dcs_write_cmd_at(ctx, MCS_NO_DOC2, 0x00);
> +
> + dcs_write_cmd_at(ctx, MCS_PANCTRLSET1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
> + dcs_write_cmd_at(ctx, MCS_PANCTRLSET2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> + 0, 0, 0, 0, 0);
> + dcs_write_cmd_at(ctx, MCS_PANCTRLSET3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> + 0, 0, 0, 0, 0);
> + dcs_write_cmd_at(ctx, MCS_PANCTRLSET4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
> + dcs_write_cmd_at(ctx, MCS_PANCTRLSET5, 0, 4, 4, 4, 4, 4, 0, 0, 0, 0,
> + 0, 0, 0, 0, 0);
> + dcs_write_cmd_at(ctx, MCS_PANCTRLSET6, 0, 0, 0, 0, 0, 0, 4, 4, 4, 4,
> + 4, 0, 0, 0, 0);
> + dcs_write_cmd_at(ctx, MCS_PANCTRLSET7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
> + dcs_write_cmd_at(ctx, MCS_PANCTRLSET8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
> + 0xFF, 0xFF, 0xFF, 0xFF, 0xFF);
> +
> + dcs_write_cmd_at(ctx, MCS_PANU2D1, 0x00, 0x26, 0x09, 0x0B, 0x01, 0x25,
> + 0x00, 0x00, 0x00, 0x00);
> + dcs_write_cmd_at(ctx, MCS_PANU2D2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + 0x00, 0x00, 0x00, 0x00, 0x00, 0x26, 0x0A, 0x0C, 0x02);
> + dcs_write_cmd_at(ctx, MCS_PANU2D3, 0x25, 0x00, 0x00, 0x00, 0x00, 0x00,
> + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
> + dcs_write_cmd_at(ctx, MCS_PAND2U1, 0x00, 0x25, 0x0C, 0x0A, 0x02, 0x26,
> + 0x00, 0x00, 0x00, 0x00);
> + dcs_write_cmd_at(ctx, MCS_PAND2U2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> + 0x00, 0x00, 0x00, 0x00, 0x00, 0x25, 0x0B, 0x09, 0x01);
> + dcs_write_cmd_at(ctx, MCS_PAND2U3, 0x26, 0x00, 0x00, 0x00, 0x00, 0x00,
> + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
> +
> + dcs_write_cmd_at(ctx, MCS_PWR_CTRL1 + 1, 0x66);
> +
> + dcs_write_cmd_at(ctx, MCS_NO_DOC3, 0x06);
> +
> + dcs_write_cmd_at(ctx, MCS_GMCT2_2P, 0x00, 0x09, 0x0F, 0x0E, 0x07, 0x10,
> + 0x0B, 0x0A, 0x04, 0x07, 0x0B, 0x08, 0x0F, 0x10, 0x0A,
> + 0x01);
> + dcs_write_cmd_at(ctx, MCS_GMCT2_2N, 0x00, 0x09, 0x0F, 0x0E, 0x07, 0x10,
> + 0x0B, 0x0A, 0x04, 0x07, 0x0B, 0x08, 0x0F, 0x10, 0x0A,
> + 0x01);
> +
> + /* Exit CMD2 */
> + dcs_write_cmd_at(ctx, MCS_CMD2_ENA1, 0xFF, 0xFF, 0xFF);
> +
> + ret = mipi_dsi_dcs_nop(dsi);
> + if (ret)
> + return ret;
> +
> + ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> + if (ret)
> + return ret;
> +
> + /* Wait for sleep out exit */
> + mdelay(120);
> +
> + /* Default portrait 480x800 rgb24 */
> + dcs_write_seq(ctx, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
> +
> + ret = mipi_dsi_dcs_set_column_address(dsi, 0,
> + default_mode.hdisplay - 1);
> + if (ret)
> + return ret;
> +
> + ret = mipi_dsi_dcs_set_page_address(dsi, 0, default_mode.vdisplay - 1);
> + if (ret)
> + return ret;
> +
> + /* See otm8009a driver documentation for pixel format descriptions */
> + ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT |
> + MIPI_DCS_PIXEL_FMT_24BIT << 4);
> + if (ret)
> + return ret;
> +
> + /* Disable CABC feature */
> + dcs_write_seq(ctx, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
> +
> + ret = mipi_dsi_dcs_set_display_on(dsi);
> + if (ret)
> + return ret;
> +
> + ret = mipi_dsi_dcs_nop(dsi);
> + if (ret)
> + return ret;
> +
> + /* Send Command GRAM memory write (no parameters) */
> + dcs_write_seq(ctx, MIPI_DCS_WRITE_MEMORY_START);
> +
> + return 0;
> +}
> +
> +static int otm8009a_disable(struct drm_panel *panel)
> +{
> + struct otm8009a *ctx = panel_to_otm8009a(panel);
> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> + int ret;
> +
> + if (!ctx->enabled)
> + return 0; /* This is not an issue so we return 0 here */
> +
> + /* Power off the backlight. Note: end-user still controls brightness */
> + ctx->bl_dev->props.power = FB_BLANK_POWERDOWN;
> + ret = backlight_update_status(ctx->bl_dev);
> + if (ret)
> + return ret;
> +
> + ret = mipi_dsi_dcs_set_display_off(dsi);
> + if (ret < 0)
> + return ret;
> +
> + ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
> + if (ret < 0)
> + return ret;
> +
> + msleep(120);
> +
> + ctx->enabled = false;
> +
> + return 0;
> +}
> +
> +static int otm8009a_unprepare(struct drm_panel *panel)
> +{
> + struct otm8009a *ctx = panel_to_otm8009a(panel);
> +
> + if (!ctx->prepared)
> + return 0;
> +
> + if (ctx->reset_gpio) {
> + gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> + msleep(20);
> + }
> +
> + ctx->prepared = false;
> +
> + return 0;
> +}
> +
> +static int otm8009a_prepare(struct drm_panel *panel)
> +{
> + struct otm8009a *ctx = panel_to_otm8009a(panel);
> + int ret;
> +
> + if (ctx->prepared)
> + return 0;
> +
> + if (ctx->reset_gpio) {
> + gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> + gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> + msleep(20);
> + gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> + msleep(100);
> + }
> +
> + ret = otm8009a_init_sequence(ctx);
> + if (ret)
> + return ret;
> +
> + ctx->prepared = true;
> +
> + /* Power on the backlight. Note: end-user still controls brightness */
> + ctx->bl_dev->props.power = FB_BLANK_UNBLANK;
> + backlight_update_status(ctx->bl_dev);
> +
> + return 0;
> +}
> +
> +static int otm8009a_enable(struct drm_panel *panel)
> +{
> + struct otm8009a *ctx = panel_to_otm8009a(panel);
> +
> + ctx->enabled = true;
> +
> + return 0;
> +}
I am not sure about it, but I guess unblanking should be performed in
_enable callback. Otherwise you risk seeing garbage at panel start - it
starts displaying uninitialized data.
Usually sequence looks like:
A. Power on DSI host
B. Initialize panel (prepare callback)
C. Start video transmission from the host to the panel
D. wait about 120ms, then unblank panel (enable callback)
Of course this is only my experience, maybe your panel is different.
Beside above comments:
Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
--
Regards
Andrzej
> +
> +static int otm8009a_get_modes(struct drm_panel *panel)
> +{
> + struct drm_display_mode *mode;
> +
> + mode = drm_mode_duplicate(panel->drm, &default_mode);
> + if (!mode) {
> + DRM_ERROR("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);
> +
> + panel->connector->display_info.width_mm = mode->width_mm;
> + panel->connector->display_info.height_mm = mode->height_mm;
> +
> + return 1;
> +}
> +
> +static const struct drm_panel_funcs otm8009a_drm_funcs = {
> + .disable = otm8009a_disable,
> + .unprepare = otm8009a_unprepare,
> + .prepare = otm8009a_prepare,
> + .enable = otm8009a_enable,
> + .get_modes = otm8009a_get_modes,
> +};
> +
> +/*
> + * DSI-BASED BACKLIGHT
> + */
> +
> +static int otm8009a_backlight_update_status(struct backlight_device *bd)
> +{
> + struct otm8009a *ctx = bl_get_data(bd);
> + u8 data[2];
> +
> + if (!ctx->prepared) {
> + DRM_DEBUG("lcd not ready yet for setting its backlight!\n");
> + return -ENXIO;
> + }
> +
> + if (bd->props.power <= FB_BLANK_NORMAL) {
> + /* Power on the backlight with the requested brightness
> + * Note We can not use mipi_dsi_dcs_set_display_brightness()
> + * as otm8009a driver support only 8-bit brightness (1 param).
> + */
> + data[0] = MIPI_DCS_SET_DISPLAY_BRIGHTNESS;
> + data[1] = bd->props.brightness;
> + otm8009a_dcs_write_buf(ctx, data, ARRAY_SIZE(data));
> +
> + /* set Brightness Control & Backlight on */
> + data[1] = 0x24;
> +
> + } else {
> + /* Power off the backlight: set Brightness Control & Bl off */
> + data[1] = 0;
> + }
> +
> + /* Update Brightness Control & Backlight */
> + data[0] = MIPI_DCS_WRITE_CONTROL_DISPLAY;
> + otm8009a_dcs_write_buf(ctx, data, ARRAY_SIZE(data));
> +
> + return 0;
> +}
> +
> +static const struct backlight_ops otm8009a_backlight_ops = {
> + .update_status = otm8009a_backlight_update_status,
> +};
> +
> +static int otm8009a_probe(struct mipi_dsi_device *dsi)
> +{
> + struct device *dev = &dsi->dev;
> + struct otm8009a *ctx;
> + int ret;
> +
> + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> + if (!ctx)
> + return -ENOMEM;
> +
> + ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
> + if (IS_ERR(ctx->reset_gpio)) {
> + dev_err(dev, "cannot get reset-gpio\n");
> + return PTR_ERR(ctx->reset_gpio);
> + }
> +
> + mipi_dsi_set_drvdata(dsi, ctx);
> +
> + ctx->dev = dev;
> +
> + dsi->lanes = 2;
> + dsi->format = MIPI_DSI_FMT_RGB888;
> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
> + MIPI_DSI_MODE_LPM;
> +
> + drm_panel_init(&ctx->panel);
> + ctx->panel.dev = dev;
> + ctx->panel.funcs = &otm8009a_drm_funcs;
> +
> + ctx->bl_dev = backlight_device_register(DRV_NAME "_backlight", dev, ctx,
> + &otm8009a_backlight_ops, NULL);
> + if (IS_ERR(ctx->bl_dev)) {
> + dev_err(dev, "failed to register backlight device\n");
> + return PTR_ERR(ctx->bl_dev);
> + }
> +
> + ctx->bl_dev->props.max_brightness = OTM8009A_BACKLIGHT_MAX;
> + ctx->bl_dev->props.brightness = OTM8009A_BACKLIGHT_DEFAULT;
> + ctx->bl_dev->props.power = FB_BLANK_POWERDOWN;
> + ctx->bl_dev->props.type = BACKLIGHT_RAW;
> +
> + drm_panel_add(&ctx->panel);
> +
> + ret = mipi_dsi_attach(dsi);
> + if (ret < 0) {
> + dev_err(dev, "mipi_dsi_attach failed. Is host ready?\n");
> + drm_panel_remove(&ctx->panel);
> + backlight_device_unregister(ctx->bl_dev);
> + return ret;
> + }
> +
> + DRM_INFO(DRV_NAME "_panel %ux%u@%u %ubpp dsi %udl - ready\n",
> + default_mode.hdisplay, default_mode.vdisplay,
> + default_mode.vrefresh,
> + mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
> +
> + return 0;
> +}
> +
> +static int otm8009a_remove(struct mipi_dsi_device *dsi)
> +{
> + struct otm8009a *ctx = mipi_dsi_get_drvdata(dsi);
> +
> + mipi_dsi_detach(dsi);
> + drm_panel_remove(&ctx->panel);
> +
> + backlight_device_unregister(ctx->bl_dev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id orisetech_otm8009a_of_match[] = {
> + { .compatible = "orisetech,otm8009a" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, orisetech_otm8009a_of_match);
> +
> +static struct mipi_dsi_driver orisetech_otm8009a_driver = {
> + .probe = otm8009a_probe,
> + .remove = otm8009a_remove,
> + .driver = {
> + .name = DRV_NAME "_panel",
> + .of_match_table = orisetech_otm8009a_of_match,
> + },
> +};
> +module_mipi_dsi_driver(orisetech_otm8009a_driver);
> +
> +MODULE_AUTHOR("Philippe Cornu <philippe.cornu@xxxxxx>");
> +MODULE_AUTHOR("Yannick Fertre <yannick.fertre@xxxxxx>");
> +MODULE_DESCRIPTION("DRM driver for Orise Tech OTM8009A MIPI DSI panel");
> +MODULE_LICENSE("GPL v2");
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