The shift6mq's variant supports controlling the backlight via DSI
commands. Use that if a max_brightness is set in the device specific
data.
Signed-off-by: Guido Günther <a...@sigxcpu.org>
---
drivers/gpu/drm/panel/panel-visionox-rm69299.c | 67 ++++++++++++++++++++++++++
1 file changed, 67 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-visionox-rm69299.c
b/drivers/gpu/drm/panel/panel-visionox-rm69299.c
index
2216d38366ea37368d15480f9d8a8ccbfe77ba3b..5e5ff6056c80e67a5bf8fe4911cdbc588db5d03b
100644
--- a/drivers/gpu/drm/panel/panel-visionox-rm69299.c
+++ b/drivers/gpu/drm/panel/panel-visionox-rm69299.c
@@ -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[] = {
--
2.51.0
