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drm/panel: himax-hx83121a: add backlight regulator support

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The backlight, when managed by the panel controller, could be powered by
an external regulator, and shutting down the regulator could power off
the backlight.

Add support for such a regulator. It's powered off when the backlight is
0 (either by setting brightness to 0 or setting bl_power), and powered
on when the backlight should be operating.

Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260608162622.403713-3-zhengxingda@iscas.ac.cn
This commit is contained in:
Icenowy Zheng
2026-06-18 15:53:23 +02:00
committed by Neil Armstrong
parent ae8dbbe895
commit 98b46e693b
1 changed files with 26 additions and 0 deletions
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drivers/gpu/drm/panel/panel-himax-hx83121a.c
+26
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@@ -34,7 +34,9 @@ struct himax {
struct drm_dsc_config dsc;
struct gpio_desc *reset_gpio;
struct regulator_bulk_data *supplies;
struct regulator *bl_supply;
struct backlight_device *backlight;
bool backlight_enabled;
};
struct panel_desc {
@@ -195,7 +197,27 @@ static int himax_bl_update_status(struct backlight_device *bl)
{
struct himax *ctx = bl_get_data(bl);
u16 brightness = backlight_get_brightness(bl);
int ret = 0;
if (!brightness) {
if (ctx->backlight_enabled)
ret = regulator_disable(ctx->bl_supply);
if (ret)
return ret;
ctx->backlight_enabled = false;
return 0;
}
/* TODO: brightness to raw map table */
if (!ctx->backlight_enabled)
ret = regulator_enable(ctx->bl_supply);
if (ret)
return ret;
ctx->backlight_enabled = true;
return mipi_dsi_dcs_set_display_brightness_large(to_primary_dsi(ctx),
brightness);
}
@@ -647,6 +669,10 @@ static int himax_probe(struct mipi_dsi_device *dsi)
ctx->panel.prepare_prev_first = true;
if (desc->has_dcs_backlight) {
ctx->bl_supply = devm_regulator_get_optional(dev, "bl");
if (IS_ERR(ctx->bl_supply))
return dev_err_probe(dev, PTR_ERR(ctx->bl_supply),
"Failed to get backlight supply\n");
ctx->backlight = himax_create_backlight(ctx);
if (IS_ERR(ctx->backlight))
return dev_err_probe(dev, PTR_ERR(ctx->backlight),