Hi Hoegeun,
Nice to see patches completing support for mainlined platforms.
On 09.06.2017 06:59, Hoegeun Kwon wrote:
> This patch adds MIPI-DSI based S6E63J0X03 AMOLED LCD panel driver
> which uses mipi_dsi bus to communicate with panel. The panel has
> 320×320 resolution in 1.63" physical panel. This panel is used in
> Samsung Galaxy Gear 2.
>
> Signed-off-by: Inki Dae <inki.dae@xxxxxxxxxxx>
> Signed-off-by: Hyungwon Hwang <human.hwang@xxxxxxxxxxx>
> Signed-off-by: Hoegeun Kwon <hoegeun.kwon@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/panel/Kconfig | 7 +
> drivers/gpu/drm/panel/Makefile | 1 +
> drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c | 491 +++++++++++++++++++++++
> 3 files changed, 499 insertions(+)
> create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 3e29a99..e47e56d 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -68,6 +68,13 @@ config DRM_PANEL_SAMSUNG_S6E3HA2
> depends on DRM_MIPI_DSI
> select VIDEOMODE_HELPERS
>
> +config DRM_PANEL_SAMSUNG_S6E63J0X03
> + tristate "Samsung S6E63J0X03 DSI video mode panel"
I suspect it is command mode panel, isn't?
> + depends on OF
> + depends on DRM_MIPI_DSI
> + depends on BACKLIGHT_CLASS_DEVICE
> + select VIDEOMODE_HELPERS
> +
> config DRM_PANEL_SAMSUNG_S6E8AA0
> tristate "Samsung S6E8AA0 DSI video mode panel"
> depends on OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 292b3c7..f028269 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -5,6 +5,7 @@ obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
> obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
> obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
> obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
> +obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
> obj-$(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
> diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c b/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
> new file mode 100644
> index 0000000..bf70a20
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
> @@ -0,0 +1,491 @@
> +/*
> + * MIPI-DSI based S6E63J0X03 AMOLED lcd 1.63 inch panel driver.
> + *
> + * Copyright (c) 2014 Samsung Electronics Co., Ltd
Maybe range 2014-2017 would be better.
> + *
> + * Inki Dae, <inki.dae@xxxxxxxxxxx>
> + * Hoegeun Kwon, <hoegeun.kwon@xxxxxxxxxxx>
No comma after name.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_panel.h>
> +#include <linux/backlight.h>
> +#include <linux/gpio.h>
Probably linux/gpio/consumer.h should be used here.
> +#include <linux/regulator/consumer.h>
> +#include <video/mipi_display.h>
> +
> +#define MCS_LEVEL2_KEY 0xf0
> +#define MCS_MTP_KEY 0xf1
> +#define MCS_MTP_SET3 0xd4
> +
> +#define MIN_BRIGHTNESS 0
> +#define MAX_BRIGHTNESS 100
> +#define DEFAULT_BRIGHTNESS 80
> +
> +#define NUM_GAMMA_STEPS 9
> +#define GAMMA_CMD_CNT 28
> +
> +struct s6e63j0x03 {
> + struct device *dev;
> + struct drm_panel panel;
> + struct backlight_device *bl_dev;
> +
> + struct regulator_bulk_data supplies[2];
> + struct gpio_desc *reset_gpio;
> +};
> +
> +static const unsigned char gamma_tbl[NUM_GAMMA_STEPS][GAMMA_CMD_CNT] = {
> + { /* Gamma 10 */
> + MCS_MTP_SET3,
> + 0x00, 0x00, 0x00, 0x7f, 0x7f, 0x7f, 0x52, 0x6b, 0x6f, 0x26,
> + 0x28, 0x2d, 0x28, 0x26, 0x27, 0x33, 0x34, 0x32, 0x36, 0x36,
> + 0x35, 0x00, 0xab, 0x00, 0xae, 0x00, 0xbf
> + },
> + { /* gamma 30 */
> + MCS_MTP_SET3,
> + 0x00, 0x00, 0x00, 0x70, 0x7f, 0x7f, 0x4e, 0x64, 0x69, 0x26,
> + 0x27, 0x2a, 0x28, 0x29, 0x27, 0x31, 0x32, 0x31, 0x35, 0x34,
> + 0x35, 0x00, 0xc4, 0x00, 0xca, 0x00, 0xdc
> + },
> + { /* gamma 60 */
> + MCS_MTP_SET3,
> + 0x00, 0x00, 0x00, 0x65, 0x7b, 0x7d, 0x5f, 0x67, 0x68, 0x2a,
> + 0x28, 0x29, 0x28, 0x2a, 0x27, 0x31, 0x2f, 0x30, 0x34, 0x33,
> + 0x34, 0x00, 0xd9, 0x00, 0xe4, 0x00, 0xf5
> + },
> + { /* gamma 90 */
> + MCS_MTP_SET3,
> + 0x00, 0x00, 0x00, 0x4d, 0x6f, 0x71, 0x67, 0x6a, 0x6c, 0x29,
> + 0x28, 0x28, 0x28, 0x29, 0x27, 0x30, 0x2e, 0x30, 0x32, 0x31,
> + 0x31, 0x00, 0xea, 0x00, 0xf6, 0x01, 0x09
> + },
> + { /* gamma 120 */
> + MCS_MTP_SET3,
> + 0x00, 0x00, 0x00, 0x3d, 0x66, 0x68, 0x69, 0x69, 0x69, 0x28,
> + 0x28, 0x27, 0x28, 0x28, 0x27, 0x30, 0x2e, 0x2f, 0x31, 0x31,
> + 0x30, 0x00, 0xf9, 0x01, 0x05, 0x01, 0x1b
> + },
> + { /* gamma 150 */
> + MCS_MTP_SET3,
> + 0x00, 0x00, 0x00, 0x31, 0x51, 0x53, 0x66, 0x66, 0x67, 0x28,
> + 0x29, 0x27, 0x28, 0x27, 0x27, 0x2e, 0x2d, 0x2e, 0x31, 0x31,
> + 0x30, 0x01, 0x04, 0x01, 0x11, 0x01, 0x29
> + },
> + { /* gamma 200 */
> + MCS_MTP_SET3,
> + 0x00, 0x00, 0x00, 0x2f, 0x4f, 0x51, 0x67, 0x65, 0x65, 0x29,
> + 0x2a, 0x28, 0x27, 0x25, 0x26, 0x2d, 0x2c, 0x2c, 0x30, 0x30,
> + 0x30, 0x01, 0x14, 0x01, 0x23, 0x01, 0x3b
> + },
> + { /* gamma 240 */
> + MCS_MTP_SET3,
> + 0x00, 0x00, 0x00, 0x2c, 0x4d, 0x50, 0x65, 0x63, 0x64, 0x2a,
> + 0x2c, 0x29, 0x26, 0x24, 0x25, 0x2c, 0x2b, 0x2b, 0x30, 0x30,
> + 0x30, 0x01, 0x1e, 0x01, 0x2f, 0x01, 0x47
> + },
> + { /* gamma 300 */
> + MCS_MTP_SET3,
> + 0x00, 0x00, 0x00, 0x38, 0x61, 0x64, 0x65, 0x63, 0x64, 0x28,
> + 0x2a, 0x27, 0x26, 0x23, 0x25, 0x2b, 0x2b, 0x2a, 0x30, 0x2f,
> + 0x30, 0x01, 0x2d, 0x01, 0x3f, 0x01, 0x57
> + }
> +};
> +
> +static const unsigned char prepare_cmds1[][15] = {
> + { 3, 0xf2, 0x1c, 0x28 }, /* porch_adjustment */
> + { 4, 0xb5, 0x00, 0x02, 0x00 }, /* frame_freq */
> + { 5, 0x2a, 0x00, 0x14, 0x01, 0x53 }, /* mem_addr_set_0 */
> + { 5, 0x2b, 0x00, 0x00, 0x01, 0x3f }, /* mem_addr_set_1 */
Two commands above are realized by mipi_dsi_dcs_set_column_address and
mipi_dsi_dcs_set_page_address helpers.
> + { 14, 0xf8, 0x08, 0x08, 0x08, 0x17, /* ltps_timming_set_0_60hz */
> + 0x00, 0x2a, 0x02, 0x26,
> + 0x00, 0x00, 0x02, 0x00, 0x00 },
> + { 2, 0xf7, 0x02 }, /* ltps_timming_set_1 */
> + { 2, 0xb0, 0x01 }, /* param_pos_te_edge */
> + { 2, 0xe2, 0x0f }, /* te_rising_edge */
> + { 2, 0xb0, 0x00 }, /* param_pos_default */
> + { 1, MIPI_DCS_EXIT_SLEEP_MODE },
mipi_dsi_dcs_exit_sleep_mode, I am not a big fan of these helpers, but
at least the code will be consistent with current drm_panel drivers.
> +};
> +
> +static const unsigned char prepare_cmds2[][4] = {
> + { 3, 0xb1, 0x00, 0x09 }, /* elvss_cond */
> + { 2, 0x36, 0x40 }, /* set_pos */
It is standard DCS command:
MIPI_DCS_SET_ADDRESS_MODE = 0x36,
> + { 2, 0x51, 0xff }, /* white_brightness_default */
> + { 2, 0x53, 0x20 }, /* white_ctrl */
> + { 2, 0x55, 0x00 }, /* acl_off */
MIPI_DCS_SET_DISPLAY_BRIGHTNESS = 0x51, /* MIPI DCS 1.3 */
MIPI_DCS_WRITE_CONTROL_DISPLAY = 0x53, /* MIPI DCS 1.3 */
MIPI_DCS_WRITE_POWER_SAVE = 0x55, /* MIPI DCS 1.3 */
> + { 1, MIPI_DCS_SET_TEAR_ON },
mipi_dsi_dcs_set_tear_on
> +};
> +
I think it would be probably better to remove prepare_cmds[12] arrays
and code commands directly,
maybe with some helper allowing variable number of parameters for DCS
command, it has chances to be accepted[1].
[1]: http://marc.info/?l=dri-devel&m=148637093704184&w=2
> +
> +static inline struct s6e63j0x03 *panel_to_s6e63j0x03(struct drm_panel *panel)
> +{
> + return container_of(panel, struct s6e63j0x03, panel);
> +}
> +
> +static inline ssize_t s6e63j0x03_dcs_write_seq(struct s6e63j0x03 *ctx,
> + const void *seq, size_t len)
> +{
> + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> +
> + return mipi_dsi_dcs_write_buffer(dsi, seq, len);
> +}
> +
> +static inline int s6e63j0x03_enable_lv2_command(struct s6e63j0x03 *ctx)
> +{
> + unsigned char seq[] = { MCS_LEVEL2_KEY, 0x5a, 0x5a };
> +
> + return s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));
> +}
> +
> +static inline int s6e63j0x03_apply_mtp_key(struct s6e63j0x03 *ctx, bool on)
> +{
> + unsigned char seq1[3] = { MCS_MTP_KEY, 0x5a, 0x5a };
> + unsigned char seq2[3] = { MCS_MTP_KEY, 0xa5, 0xa5 };
> +
> + return s6e63j0x03_dcs_write_seq(ctx, on ? seq1 : seq2,
> + ARRAY_SIZE(seq1));
> +}
> +
> +static int s6e63j0x03_power_on(struct s6e63j0x03 *ctx)
> +{
> + int ret;
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> + if (ret < 0)
> + return ret;
> +
> + msleep(30);
> +
> + gpiod_set_value(ctx->reset_gpio, 0);
> + usleep_range(1000, 2000);
> + gpiod_set_value(ctx->reset_gpio, 1);
> + usleep_range(5000, 6000);
> +
> + return 0;
> +}
> +
> +static int s6e63j0x03_power_off(struct s6e63j0x03 *ctx)
> +{
> + int ret;
> +
> + gpiod_set_value(ctx->reset_gpio, 0);
> +
> + ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int s6e63j0x03_get_brightness(struct backlight_device *bl_dev)
> +{
> + return bl_dev->props.brightness;
> +}
This callback can be omitted.
> +
> +static unsigned int s6e63j0x03_get_brightness_index(unsigned int brightness)
> +{
> + unsigned int index;
> +
> + index = brightness / (MAX_BRIGHTNESS / NUM_GAMMA_STEPS);
> +
> + if (index >= NUM_GAMMA_STEPS)
> + index = NUM_GAMMA_STEPS - 1;
> +
> + return index;
> +}
> +
> +static int s6e63j0x03_update_gamma(struct s6e63j0x03 *ctx,
> + unsigned int brightness)
> +{
> + struct backlight_device *bl_dev = ctx->bl_dev;
> + unsigned int index = s6e63j0x03_get_brightness_index(brightness);
> + int ret;
> +
> + ret = s6e63j0x03_apply_mtp_key(ctx, true);
> + if (ret < 0)
> + return ret;
> +
> + ret = s6e63j0x03_dcs_write_seq(ctx, gamma_tbl[index], GAMMA_CMD_CNT);
> + if (ret < 0)
> + return ret;
> +
> + ret = s6e63j0x03_apply_mtp_key(ctx, false);
> + if (ret < 0)
> + return ret;
> +
> + bl_dev->props.brightness = brightness;
> +
> + return 0;
> +}
> +
> +static int s6e63j0x03_set_brightness(struct backlight_device *bl_dev)
> +{
> + struct s6e63j0x03 *ctx = (struct s6e63j0x03 *)bl_get_data(bl_dev);
> + unsigned int brightness = bl_dev->props.brightness;
> + int ret;
> +
> + if (brightness < MIN_BRIGHTNESS ||
> + brightness > bl_dev->props.max_brightness) {
> + dev_err(ctx->dev, "Invalid brightness: %u\n", brightness);
> + return -EINVAL;
> + }
Range check is performed already by the framework, so it can be removed.
> +
> + if (bl_dev->props.power > FB_BLANK_NORMAL)
> + return -EPERM;
I guess this is unnecessary as almost nobody checks error code returned
by backlight_update_status.
I suspect the function is missing props.power handling but the whole
backlight framework is not clear for me :)
> +
> + ret = s6e63j0x03_update_gamma(ctx, brightness);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static const struct backlight_ops s6e63j0x03_bl_ops = {
> + .get_brightness = s6e63j0x03_get_brightness,
> + .update_status = s6e63j0x03_set_brightness,
> +};
> +
> +static int s6e63j0x03_disable(struct drm_panel *panel)
> +{
> + struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
> + struct backlight_device *bl_dev = ctx->bl_dev;
> + u8 seq[] = { MIPI_DCS_SET_DISPLAY_OFF };
> + int ret;
> +
> + ret = s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));
Use mipi_dsi_dcs_set_display_off instead.
> + if (ret > 0)
> + bl_dev->props.power = FB_BLANK_NORMAL;
> +
> + return 0;
> +}
> +
> +static int s6e63j0x03_unprepare(struct drm_panel *panel)
> +{
> + struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
> + struct backlight_device *bl_dev = ctx->bl_dev;
> + u8 seq[] = { MIPI_DCS_ENTER_SLEEP_MODE };
> + int ret;
> +
> + ret = s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));
mipi_dsi_dcs_enter_sleep_mode
> + if (ret < 0)
> + return ret;
> +
> + msleep(120);
> +
> + ret = s6e63j0x03_power_off(ctx);
> + if (ret < 0)
> + return ret;
> +
> + bl_dev->props.power = FB_BLANK_POWERDOWN;
> +
> + return 0;
> +}
> +
> +static int s6e63j0x03_prepare(struct drm_panel *panel)
> +{
> + struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
> + struct backlight_device *bl_dev = ctx->bl_dev;
> + int ret;
> + int i;
> +
> + ret = s6e63j0x03_power_on(ctx);
> + if (ret < 0)
> + return ret;
> +
> + ret = s6e63j0x03_enable_lv2_command(ctx);
> + if (ret < 0)
> + return ret;
> +
> + ret = s6e63j0x03_apply_mtp_key(ctx, true);
> + if (ret < 0)
> + return ret;
> +
> + for (i = 0; i < ARRAY_SIZE(prepare_cmds1); i++) {
> + ret = s6e63j0x03_dcs_write_seq(ctx, &prepare_cmds1[i][1],
> + prepare_cmds1[i][0]);
> + if (ret < 0)
> + return ret;
> + }
> +
> + msleep(120);
> +
> + for (i = 0; i < ARRAY_SIZE(prepare_cmds2); i++) {
> + ret = s6e63j0x03_dcs_write_seq(ctx, &prepare_cmds2[i][1],
> + prepare_cmds2[i][0]);
> + if (ret < 0)
> + return ret;
> + }
> +
> + ret = s6e63j0x03_apply_mtp_key(ctx, false);
> + if (ret < 0)
> + return ret;
> +
> + bl_dev->props.power = FB_BLANK_NORMAL;
> +
> + return 0;
> +}
> +
> +static int s6e63j0x03_enable(struct drm_panel *panel)
> +{
> + struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
> + struct backlight_device *bl_dev = ctx->bl_dev;
> + u8 seq[] = { MIPI_DCS_SET_DISPLAY_ON };
> + int ret;
> +
> + ret = s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));
> + if (ret > 0)
> + bl_dev->props.power = FB_BLANK_UNBLANK;
> +
> + return 0;
> +}
For many (maybe most) panels power on sequence is as follows:
0. Enable power supplies and gpios.
1. Initialization, including MIPI_DCS_EXIT_SLEEP_MODE
2. Wait for 120ms, to avoid display glitches.
3. Unblanking and adjusting display, including MIPI_DCS_SET_DISPLAY_ON.
And power-off:
4. MIPI_DCS_SET_DISPLAY_OFF
5. MIPI_DCS_ENTER_SLEEP_MODE
6. Wait for 120ms
7. Disable power supplies and gpios.
I suppose waiting for 120ms is a good indicator what should be put into
prepare/enable/disable/unprepare phase.
In my opinion it should be as follows:
Prepare: 0, 1
Enable: 2, 3
Disable: 4,5,6
Unprepare: 7
What do you think about it?
Could you arrange the code this way and test if it works correctly?
Maybe you/other developers have some opinions about it?
> +
> +static const struct drm_display_mode default_mode = {
> + .clock = 4644,
> + .hdisplay = 320,
> + .hsync_start = 320 + 1,
> + .hsync_end = 320 + 1 + 1,
> + .htotal = 320 + 1 + 1 + 1,
> + .vdisplay = 320,
> + .vsync_start = 320 + 150,
> + .vsync_end = 320 + 150 + 1,
> + .vtotal = 320 + 150 + 1 + 2,
> + .vrefresh = 30,
> + .flags = 0,
> +};
clock should be equal vtotal*htotal*vrefresh, it is little higher? what
is the reason?
What is actual refresh rate?
> +
> +static int s6e63j0x03_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_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(connector, mode);
> +
> + connector->display_info.width_mm = 29;
> + connector->display_info.height_mm = 29;
> +
> + return 1;
> +}
> +
> +static const struct drm_panel_funcs s6e63j0x03_funcs = {
> + .disable = s6e63j0x03_disable,
> + .unprepare = s6e63j0x03_unprepare,
> + .prepare = s6e63j0x03_prepare,
> + .enable = s6e63j0x03_enable,
> + .get_modes = s6e63j0x03_get_modes,
> +};
> +
> +static int s6e63j0x03_probe(struct mipi_dsi_device *dsi)
> +{
> + struct device *dev = &dsi->dev;
> + struct s6e63j0x03 *ctx;
> + int ret;
> +
> + ctx = devm_kzalloc(dev, sizeof(struct s6e63j0x03), GFP_KERNEL);
> + if (!ctx)
> + return -ENOMEM;
> +
> + mipi_dsi_set_drvdata(dsi, ctx);
> +
> + ctx->dev = dev;
> +
> + dsi->lanes = 1;
> + dsi->format = MIPI_DSI_FMT_RGB888;
> + dsi->mode_flags = MIPI_DSI_MODE_EOT_PACKET | MIPI_DSI_MODE_VIDEO_BURST;
MIPI_DSI_MODE_VIDEO_BURST flag is only valid with MIPI_DSI_MODE_VIDEO,
ie in video mode.
--
Regards
Andrzej
> +
> + ctx->supplies[0].supply = "vdd3";
> + ctx->supplies[1].supply = "vci";
> + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
> + ctx->supplies);
> + if (ret < 0) {
> + dev_err(dev, "failed to get regulators: %d\n", ret);
> + return ret;
> + }
> +
> + ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(ctx->reset_gpio)) {
> + dev_err(dev, "cannot get reset-gpio: %ld\n",
> + PTR_ERR(ctx->reset_gpio));
> + return PTR_ERR(ctx->reset_gpio);
> + }
> +
> + drm_panel_init(&ctx->panel);
> + ctx->panel.dev = dev;
> + ctx->panel.funcs = &s6e63j0x03_funcs;
> +
> + ctx->bl_dev = backlight_device_register("s6e63j0x03", dev, ctx,
> + &s6e63j0x03_bl_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 = MAX_BRIGHTNESS;
> + ctx->bl_dev->props.brightness = DEFAULT_BRIGHTNESS;
> + ctx->bl_dev->props.power = FB_BLANK_POWERDOWN;
> +
> + ret = drm_panel_add(&ctx->panel);
> + if (ret < 0)
> + goto unregister_backlight;
> +
> + ret = mipi_dsi_attach(dsi);
> + if (ret < 0)
> + goto remove_panel;
> +
> + return ret;
> +
> +remove_panel:
> + drm_panel_remove(&ctx->panel);
> +
> +unregister_backlight:
> + backlight_device_unregister(ctx->bl_dev);
> +
> + return ret;
> +}
> +
> +static int s6e63j0x03_remove(struct mipi_dsi_device *dsi)
> +{
> + struct s6e63j0x03 *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 s6e63j0x03_of_match[] = {
> + { .compatible = "samsung,s6e63j0x03" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, s6e63j0x03_of_match);
> +
> +static struct mipi_dsi_driver s6e63j0x03_driver = {
> + .probe = s6e63j0x03_probe,
> + .remove = s6e63j0x03_remove,
> + .driver = {
> + .name = "panel_samsung_s6e63j0x03",
> + .of_match_table = s6e63j0x03_of_match,
> + },
> +};
> +module_mipi_dsi_driver(s6e63j0x03_driver);
> +
> +MODULE_AUTHOR("Inki Dae <inki.dae@xxxxxxxxxxx>");
> +MODULE_AUTHOR("Hoegeun Kwon <hoegeun.kwon@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("MIPI-DSI based s6e63j0x03 AMOLED LCD Panel Driver");
> +MODULE_LICENSE("GPL v2");
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