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drm/panel: visionox-rm69299: Add backlight support

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The shift6mq's variant supports controlling the backlight via DSI
commands. Use that if a max_brightness is set in the device specific
data.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Guido Günther <agx@sigxcpu.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250910-shift6mq-panel-v3-3-a7729911afb9@sigxcpu.org
This commit is contained in:
Guido Günther
2025-09-10 18:39:58 +02:00
committed by Neil Armstrong
parent 39144b611e
commit 7911d8cab5
1 changed files with 67 additions and 0 deletions
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67
drivers/gpu/drm/panel/panel-visionox-rm69299.c
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@@ -3,6 +3,7 @@
* Copyright (c) 2019, The Linux Foundation. All rights reserved.
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/property.h>
@@ -20,6 +21,8 @@ struct visionox_rm69299_panel_desc {
const struct drm_display_mode *mode;
const u8 *init_seq;
unsigned int init_seq_len;
int max_brightness;
int initial_brightness;
};
struct visionox_rm69299 {
@@ -285,6 +288,63 @@ static const struct drm_panel_funcs visionox_rm69299_drm_funcs = {
.get_modes = visionox_rm69299_get_modes,
};
static int visionox_rm69299_bl_get_brightness(struct backlight_device *bl)
{
struct mipi_dsi_device *dsi = bl_get_data(bl);
u16 brightness;
int ret;
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;
}
static int visionox_rm69299_bl_update_status(struct backlight_device *bl)
{
struct mipi_dsi_device *dsi = bl_get_data(bl);
u16 brightness = backlight_get_brightness(bl);
int ret;
dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
if (ret < 0)
return ret;
dsi->mode_flags |= MIPI_DSI_MODE_LPM;
return 0;
}
static const struct backlight_ops visionox_rm69299_bl_ops = {
.update_status = visionox_rm69299_bl_update_status,
.get_brightness = visionox_rm69299_bl_get_brightness,
};
static struct backlight_device *
visionox_rm69299_create_backlight(struct visionox_rm69299 *ctx)
{
struct device *dev = &ctx->dsi->dev;
const struct backlight_properties props = {
.type = BACKLIGHT_RAW,
.brightness = ctx->desc->initial_brightness,
.max_brightness = ctx->desc->max_brightness,
};
if (!ctx->desc->max_brightness)
return 0;
return devm_backlight_device_register(dev, dev_name(dev), dev, ctx->dsi,
&visionox_rm69299_bl_ops,
&props);
}
static int visionox_rm69299_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
@@ -316,6 +376,11 @@ static int visionox_rm69299_probe(struct mipi_dsi_device *dsi)
return PTR_ERR(ctx->reset_gpio);
}
ctx->panel.backlight = visionox_rm69299_create_backlight(ctx);
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);
dsi->lanes = 4;
@@ -353,6 +418,8 @@ const struct visionox_rm69299_panel_desc visionox_rm69299_shift_desc = {
.mode = &visionox_rm69299_1080x2160_60hz,
.init_seq = (const u8 *)visionox_rm69299_1080x2160_60hz_init_seq,
.init_seq_len = ARRAY_SIZE(visionox_rm69299_1080x2160_60hz_init_seq),
.max_brightness = 255,
.initial_brightness = 50,
};
static const struct of_device_id visionox_rm69299_of_match[] = {