Re: [PATCH 2/2] drm/panel: Add driver for Visionox r66451 panel

Jessica Zhang
2023-05-30T20:10:15Z

On 5/18/2023 3:17 PM, Jessica Zhang wrote:
>
>
> On 5/17/2023 5:19 PM, Dmitry Baryshkov wrote:
>> On 16/05/2023 23:20, Jessica Zhang wrote:
>>> Add support for the 1080x2340 Visionox R66451 AMOLED DSI panel that
>>> comes with the Qualcomm HDK8350 display expansion pack.
>>>
>>> The panel enables display compression (DSC v1.2) by default.
>>>
>>> Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
>>> ---
>>>   drivers/gpu/drm/panel/Kconfig                 |   8 +
>>>   drivers/gpu/drm/panel/Makefile                |   1 +
>>>   drivers/gpu/drm/panel/panel-visionox-r66451.c | 395
>>> ++++++++++++++++++++++++++
>>>   3 files changed, 404 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/panel/Kconfig
>>> b/drivers/gpu/drm/panel/Kconfig
>>> index 29cf5fa39ff2..9c2c36dbddf3 100644
>>> --- a/drivers/gpu/drm/panel/Kconfig
>>> +++ b/drivers/gpu/drm/panel/Kconfig
>>> @@ -766,6 +766,14 @@ config DRM_PANEL_VISIONOX_VTDR6130
>>>         Say Y here if you want to enable support for Visionox
>>>         VTDR6130 1080x2400 AMOLED DSI panel.
>>> +config DRM_PANEL_VISIONOX_R66451
>>> +    tristate "Visionox R66451"
>>> +    depends on OF
>>> +    depends on DRM_MIPI_DSI
>>> +    help
>>> +      Say Y here if you want to enable support for Visionox
>>> +      R66451 1080x2340 AMOLED DSI panel.
>>> +
>>>   config DRM_PANEL_WIDECHIPS_WS2401
>>>       tristate "Widechips WS2401 DPI panel driver"
>>>       depends on SPI && GPIOLIB
>>> diff --git a/drivers/gpu/drm/panel/Makefile
>>> b/drivers/gpu/drm/panel/Makefile
>>> index b3e8ba29edd3..e043a92ee676 100644
>>> --- a/drivers/gpu/drm/panel/Makefile
>>> +++ b/drivers/gpu/drm/panel/Makefile
>>> @@ -78,5 +78,6 @@ obj-$(CONFIG_DRM_PANEL_TPO_TPG110) +=
>>> panel-tpo-tpg110.o
>>>   obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
>>>   obj-$(CONFIG_DRM_PANEL_VISIONOX_RM69299) += panel-visionox-rm69299.o
>>>   obj-$(CONFIG_DRM_PANEL_VISIONOX_VTDR6130) += panel-visionox-vtdr6130.o
>>> +obj-$(CONFIG_DRM_PANEL_VISIONOX_R66451) += panel-visionox-r66451.o
>>>   obj-$(CONFIG_DRM_PANEL_WIDECHIPS_WS2401) += panel-widechips-ws2401.o
>>>   obj-$(CONFIG_DRM_PANEL_XINPENG_XPP055C272) +=
>>> panel-xinpeng-xpp055c272.o
>>> diff --git a/drivers/gpu/drm/panel/panel-visionox-r66451.c
>>> b/drivers/gpu/drm/panel/panel-visionox-r66451.c
>>> new file mode 100644
>>> index 000000000000..e3648ead3e84
>>> --- /dev/null
>>> +++ b/drivers/gpu/drm/panel/panel-visionox-r66451.c
>>> @@ -0,0 +1,395 @@
>>> +//SPDX-License-Identifier: GPL-2.0-only
>>> +//Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights
>>> reserved.
>>> +
>>> +#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 <drm/drm_mipi_dsi.h>
>>> +#include <drm/drm_modes.h>
>>> +#include <drm/drm_panel.h>
>>> +#include <drm/display/drm_dsc.h>
>>> +#include <drm/display/drm_dsc_helper.h>
>>> +
>>> +#include <video/mipi_display.h>
>>> +
>>> +struct visionox_r66451 {
>>> +    struct drm_panel panel;
>>> +    struct mipi_dsi_device *dsi;
>>> +    struct gpio_desc *reset_gpio;
>>> +    struct regulator_bulk_data supplies[2];
>>> +    bool prepared, enabled;
>>> +};
>>> +
>>> +static inline struct visionox_r66451 *to_visionox_r66451(struct
>>> drm_panel *panel)
>>> +{
>>> +    return container_of(panel, struct visionox_r66451, panel);
>>> +}
>>> +
>>> +static void visionox_r66451_reset(struct visionox_r66451 *ctx)
>>> +{
>>> +    gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>>> +    usleep_range(10000, 10100);
>>> +    gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>>> +    usleep_range(10000, 10100);
>>> +    gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>>> +    usleep_range(10000, 10100);
>>> +}
>>> +
>>> +static int visionox_r66451_on(struct visionox_r66451 *ctx)
>>> +{
>>> +    struct mipi_dsi_device *dsi = ctx->dsi;
>>> +    struct device *dev = &dsi->dev;
>>> +    int ret;
>>> +
>>> +    dsi->mode_flags |= MIPI_DSI_MODE_LPM;
>>> +
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x00);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xc2,
>>> +                   0x09, 0x24, 0x0c, 0x00, 0x00, 0x0c, 0x00, 0x00,
>>> 0x00,
>>> +                   0x09, 0x3c);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xd7,
>>> +                   0x00, 0xb9, 0x3c, 0x00, 0x40, 0x04, 0x00, 0xa0,
>>> 0x0a,
>>> +                   0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>>> 0x19,
>>> +                   0x3c, 0x00, 0x40, 0x04, 0x00, 0xa0, 0x0a);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x80);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xde,
>>> +                   0x40, 0x00, 0x18, 0x00, 0x18, 0x00, 0x18, 0x00,
>>> 0x18,
>>> +                   0x10, 0x00, 0x18, 0x00, 0x18, 0x00, 0x18, 0x02,
>>> 0x00, 0x00);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x04);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xe8, 0x00, 0x02);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xe4, 0x00, 0x08);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x00);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xc4,
>>> +                   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>>> 0x00,
>>> +                   0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x32);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xcf,
>>> +                   0x64, 0x0b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>>> 0x08,
>>> +                   0x00, 0x0b, 0x77, 0x01, 0x01, 0x01, 0x01, 0x01,
>>> 0x01,
>>> +                   0x02, 0x02, 0x02, 0x02, 0x02, 0x03);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xd3,
>>> +                   0x45, 0x00, 0x00, 0x01, 0x13, 0x15, 0x00, 0x15,
>>> 0x07,
>>> +                   0x0f, 0x77, 0x77, 0x77, 0x37, 0xb2, 0x11, 0x00,
>>> 0xa0,
>>> +                   0x3c, 0x9c);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xd7,
>>> +                   0x00, 0xb9, 0x34, 0x00, 0x40, 0x04, 0x00, 0xa0,
>>> 0x0a,
>>> +                   0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>>> 0x19,
>>> +                   0x34, 0x00, 0x40, 0x04, 0x00, 0xa0, 0x0a);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xd8,
>>> +                   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>>> 0x00,
>>> +                   0x3a, 0x00, 0x3a, 0x00, 0x3a, 0x00, 0x3a, 0x00,
>>> 0x3a,
>>> +                   0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>>> 0x00,
>>> +                   0x00, 0x0a, 0x00, 0x0a, 0x00, 0x00, 0x00, 0x00,
>>> 0x00,
>>> +                   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>>> 0x0a,
>>> +                   0x00, 0x32, 0x00, 0x0a, 0x00, 0x22);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xdf,
>>> +                   0x50, 0x42, 0x58, 0x81, 0x2d, 0x00, 0x00, 0x00,
>>> 0x00,
>>> +                   0x00, 0x00, 0x6b, 0x00, 0x00, 0x00, 0x00, 0x00,
>>> 0x00,
>>> +                   0x00, 0x00, 0x01, 0x0f, 0xff, 0xd4, 0x0e, 0x00,
>>> 0x00,
>>> +                   0x00, 0x00, 0x00, 0x00, 0x0f, 0x53, 0xf1, 0x00,
>>> 0x00,
>>> +                   0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xf7, 0x01);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x80);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xe4, 0x34, 0xb4, 0x00, 0x00, 0x00,
>>> 0x39, 0x04, 0x09, 0x34);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xe6, 0x00);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x04);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xdf, 0x50, 0x40);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xf3, 0x50, 0x00, 0x00, 0x00, 0x00);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xf2, 0x11);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xf3, 0x01, 0x00, 0x00, 0x00, 0x01);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xf4, 0x00, 0x02);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xf2, 0x19);
>>> +    mipi_dsi_dcs_write_seq(dsi, 0xdf, 0x50, 0x42);
>>> +    mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
>>> +    mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, 0x00,
>>> 0x00, 0x04, 0x37);
>>
>> Please use mipi_dsi_dcs_set_column_address(dsi, 0, 1080 - 1);
>
> Hi Dmitry,
>
> Acked.
>
>>
>>> +    mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PAGE_ADDRESS, 0x00,
>>> 0x00, 0x09, 0x23);
>>
>> mipi_dsi_dcs_set_page_address(dsi, 0, 2340 - 1);
>
> Acked.
>
>>
>>> +
>>> +    ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
>>> +    if (ret < 0) {
>>> +        dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
>>> +        return ret;
>>> +    }
>>> +    msleep(120);
>>> +
>>> +    ret = mipi_dsi_dcs_set_display_on(dsi);
>>
>> Should the mipi_dsi_dcs_set_display_on() (and maybe exit sleep mode)
>> be a a part of _enable()? Correspondingly _off should IMO be a part of
>> _disable callback().
>
> Acked. Looking at the downstream code, it seems that all the dcs on
> commands can be sent within _enable() (and similarly for the off
> commands with _disable()).
>
>>
>>> +    if (ret < 0) {
>>> +        dev_err(dev, "Failed on set display on: %d\n", ret);
>>> +        return ret;
>>> +    }
>>> +    msleep(20);
>>
>>
>> Do we need to add here the following line?
>>
>> dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
>
> Do you mean within the return on error block?
>
> From my understanding, we should be setting the MIPI_DSI_MODE_LPM for
> panel_on() then unsetting MODE_LPM in panel_off().
>
>>
>>
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static int visionox_r66451_off(struct visionox_r66451 *ctx)
>>> +{
>>> +    struct mipi_dsi_device *dsi = ctx->dsi;
>>> +    struct device *dev = &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);
>>> +        return ret;
>>> +    }
>>> +    msleep(20);
>>> +
>>> +    ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
>>> +    if (ret < 0) {
>>> +        dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
>>> +        return ret;
>>> +    }
>>> +    msleep(120);
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static int visionox_r66451_prepare(struct drm_panel *panel)
>>> +{
>>> +    struct visionox_r66451 *ctx = to_visionox_r66451(panel);
>>> +    struct device *dev = &ctx->dsi->dev;
>>> +    int ret;
>>> +
>>> +    if (ctx->prepared)
>>> +        return 0;
>>> +
>>> +    ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies),
>>> +                    ctx->supplies);
>>> +    if (ret < 0)
>>> +        return ret;
>>> +
>>> +    visionox_r66451_reset(ctx);
>>> +
>>> +    ret = visionox_r66451_on(ctx);
>>> +    if (ret < 0) {
>>> +        dev_err(dev, "Failed to initialize panel: %d\n", ret);
>>> +        gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>>> +        regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
>>> ctx->supplies);
>>> +        return ret;
>>> +    }
>>> +
>>> +    ctx->prepared = true;
>>> +    return 0;
>>> +}
>>> +
>>> +static int visionox_r66451_unprepare(struct drm_panel *panel)
>>> +{
>>> +    struct visionox_r66451 *ctx = to_visionox_r66451(panel);
>>> +    struct device *dev = &ctx->dsi->dev;
>>> +    int ret;
>>> +
>>> +    if (!ctx->prepared)
>>> +        return 0;
>>> +
>>> +    ret = visionox_r66451_off(ctx);
>>> +    if (ret < 0)
>>> +        dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
>>> +
>>> +    gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>>> +    regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
>>> +
>>> +    ctx->prepared = false;
>>> +    return 0;
>>> +}
>>> +
>>> +static const struct drm_display_mode visionox_r66451_mode = {
>>> +    .clock = (1080 + 95 + 1 + 40) * (2340 + 25 + 1 + 4) * 120 / 1000,
>>> +    .hdisplay = 1080,
>>> +    .hsync_start = 1080 + 95,
>>> +    .hsync_end = 1080 + 95 + 1,
>>> +    .htotal = 1080 + 95 + 1 + 40,
>>> +    .vdisplay = 2340,
>>> +    .vsync_start = 2340 + 25,
>>> +    .vsync_end = 2340 + 25 + 1,
>>> +    .vtotal = 2340 + 25 + 1 + 4,
>>> +    .width_mm = 0,
>>> +    .height_mm = 0,
>>
>> Please provide real values here.
>
> Acked.
>
>>
>>> +};
>>> +
>>> +static int visionox_r66451_enable(struct drm_panel *panel)
>>> +{
>>> +    struct visionox_r66451 *ctx = to_visionox_r66451(panel);
>>> +    struct mipi_dsi_device *dsi = ctx->dsi;
>>> +    struct drm_dsc_picture_parameter_set pps;
>>> +    int ret;
>>> +
>>> +    if (ctx->enabled)
>>> +        return 0;
>>> +
>>> +    if (!dsi->dsc) {
>>> +        dev_err(&dsi->dev, "DSC not attached to DSI\n");
>>> +        return -ENODEV;
>>> +    }
>>> +
>>> +    drm_dsc_pps_payload_pack(&pps, dsi->dsc);
>>> +    ret = mipi_dsi_picture_parameter_set(dsi, &pps);
>>> +
>>> +    ctx->enabled = true;
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static int visionox_r66451_disable(struct drm_panel *panel)
>>> +{
>>> +    struct visionox_r66451 *ctx = to_visionox_r66451(panel);
>>> +
>>> +    ctx->enabled = false;
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static int visionox_r66451_get_modes(struct drm_panel *panel,
>>> +                    struct drm_connector *connector)
>>> +{
>>> +    struct drm_display_mode *mode;
>>> +
>>> +    mode = drm_mode_duplicate(connector->dev, &visionox_r66451_mode);
>>> +    if (!mode)
>>> +        return -ENOMEM;
>>> +
>>> +    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);
>>
>> Can we use drm_connector_helper_get_modes_fixed() instead?
>
> Acked.

Hi Dmitry,

Just wanted to follow up on this -- As Marijn mentioned in a separated
thread, DRM_MODE_TYPE_DRIVER is not set within
drm_connector_helper_get_modes_fixed(), and looking at the kernel docs,
that's a required flag for this mode.

Since I'm not able to set the *_TYPE_DRIVER flag before
*_get_modes_fixed() is called, I'll stick to using the previous method
of calling drm_mode_probed_add() directly in
visionox_r66451_get_modes(). (FWIW, other drivers such as
panel-visionox-vtdr6130, panel-truly-nt35597, and panel-visionox-rm69299
also don't use *_get_modes_fixed() and call drm_mode_probed_add()
directly in their get_mode() implementations.)

Thanks,

Jessica Zhang

>
>>
>>> +
>>> +    return 1;
>>> +}
>>> +
>>> +static const struct drm_panel_funcs visionox_r66451_funcs = {
>>> +    .prepare = visionox_r66451_prepare,
>>> +    .unprepare = visionox_r66451_unprepare,
>>> +    .get_modes = visionox_r66451_get_modes,
>>> +    .enable = visionox_r66451_enable,
>>> +    .disable = visionox_r66451_disable,
>>> +};
>>> +
>>> +static int visionox_r66451_bl_update_status(struct backlight_device
>>> *bl)
>>> +{
>>> +    struct mipi_dsi_device *dsi = bl_get_data(bl);
>>> +    u16 brightness = backlight_get_brightness(bl);
>>> +
>>> +    return mipi_dsi_dcs_set_display_brightness(dsi,
>>> cpu_to_le16(brightness));
>>
>> mipi_dsi_dcs_set_display_brightness() already converts the brightness,
>> so you don't need cpu_to_le16 here.
>
> Acked.
>
> Thanks,
>
> Jessica Zhang
>
>>
>>> +}
>>> +
>>> +static const struct backlight_ops visionox_r66451_bl_ops = {
>>> +    .update_status = visionox_r66451_bl_update_status,
>>> +};
>>> +
>>> +static struct backlight_device *
>>> +visionox_r66451_create_backlight(struct mipi_dsi_device *dsi)
>>> +{
>>> +    struct device *dev = &dsi->dev;
>>> +    const struct backlight_properties props = {
>>> +        .type = BACKLIGHT_RAW,
>>> +        .brightness = 255,
>>> +        .max_brightness = 4095,
>>> +    };
>>> +
>>> +    return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
>>> +                          &visionox_r66451_bl_ops, &props);
>>> +}
>>> +
>>> +static int visionox_r66451_probe(struct mipi_dsi_device *dsi)
>>> +{
>>> +    struct device *dev = &dsi->dev;
>>> +    struct visionox_r66451 *ctx;
>>> +    struct drm_dsc_config *dsc;
>>> +    int ret = 0;
>>> +
>>> +    ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
>>> +    if (!ctx)
>>> +        return -ENOMEM;
>>> +
>>> +    dsc = devm_kzalloc(dev, sizeof(*dsc), GFP_KERNEL);
>>> +    if (!dsc)
>>> +        return -ENOMEM;
>>> +
>>> +    /* Set DSC params */
>>> +    dsc->dsc_version_major = 0x1;
>>> +    dsc->dsc_version_minor = 0x2;
>>> +
>>> +    dsc->slice_height = 20;
>>> +    dsc->slice_width = 540;
>>> +    dsc->slice_count = 2;
>>> +    dsc->bits_per_component = 8;
>>> +    dsc->bits_per_pixel = 0x8 << 4;
>>> +    dsc->block_pred_enable = true;
>>> +
>>> +    dsi->dsc = dsc;
>>> +
>>> +    ctx->supplies[0].supply = "vddio";
>>> +    ctx->supplies[1].supply = "vdd";
>>> +
>>> +    ret = devm_regulator_bulk_get(&dsi->dev, ARRAY_SIZE(ctx->supplies),
>>> +            ctx->supplies);
>>> +
>>> +    if (ret < 0)
>>> +        return ret;
>>> +
>>> +    ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
>>> +    if (IS_ERR(ctx->reset_gpio))
>>> +        return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio), "Failed
>>> to get reset-gpios\n");
>>> +
>>> +    ctx->dsi = dsi;
>>> +    mipi_dsi_set_drvdata(dsi, ctx);
>>> +
>>> +    dsi->lanes = 4;
>>> +    dsi->format = MIPI_DSI_FMT_RGB888;
>>> +    dsi->mode_flags = MIPI_DSI_MODE_LPM |
>>> MIPI_DSI_CLOCK_NON_CONTINUOUS;
>>> +
>>> +    drm_panel_init(&ctx->panel, dev, &visionox_r66451_funcs,
>>> DRM_MODE_CONNECTOR_DSI);
>>> +    ctx->panel.backlight = visionox_r66451_create_backlight(dsi);
>>> +    if (IS_ERR(ctx->panel.backlight))
>>> +        return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
>>> +                "Failed to create backlight\n");
>>> +
>>> +    drm_panel_add(&ctx->panel);
>>> +
>>> +    ret = mipi_dsi_attach(dsi);
>>> +    if (ret < 0) {
>>> +        dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
>>> +        drm_panel_remove(&ctx->panel);
>>> +    }
>>> +
>>> +    return ret;
>>> +}
>>> +
>>> +static void visionox_r66451_remove(struct mipi_dsi_device *dsi)
>>> +{
>>> +    struct visionox_r66451 *ctx = mipi_dsi_get_drvdata(dsi);
>>> +    int ret;
>>> +
>>> +    ret = mipi_dsi_detach(dsi);
>>> +    if (ret < 0)
>>> +        dev_err(&dsi->dev, "Failed to detach DSI host: %d\n", ret);
>>> +
>>> +    drm_panel_remove(&ctx->panel);
>>> +}
>>> +
>>> +static const struct of_device_id visionox_r66451_of_match[] = {
>>> +    {.compatible = "visionox,r66451"},
>>> +    { /*sentinel*/ }
>>> +};
>>> +MODULE_DEVICE_TABLE(of, visionox_r66451_of_match);
>>> +
>>> +static struct mipi_dsi_driver visionox_r66451_driver = {
>>> +    .probe = visionox_r66451_probe,
>>> +    .remove = visionox_r66451_remove,
>>> +    .driver = {
>>> +        .name = "panel-visionox-r66451",
>>> +        .of_match_table = visionox_r66451_of_match,
>>> +    },
>>> +};
>>> +
>>> +module_mipi_dsi_driver(visionox_r66451_driver);
>>> +
>>> +MODULE_AUTHOR("Jessica Zhang <quic_jesszhan@quicinc.com>");
>>> +MODULE_DESCRIPTION("Panel driver for the Visionox R66451 AMOLED DSI
>>> panel");
>>> +MODULE_LICENSE("GPL");
>>>
>>
>> --
>> With best wishes
>> Dmitry
>>