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drm/panel: s6e63m0: Support max-brightness

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The "max-brightness" is a standard backlight property that
we need to support for the Samsung GT-I8190 Golden because
the display will go black if we crank up the brightness
too high.

As the platform needs this ability to give picture this is
a regression fix along with the addition of the property
to the GT-I8190 device tree.

Cc: Stephan Gerhold <stephan@gerhold.net>
Fixes: 9c3f0a0dd6 ("drm/panel: s6e63m0: Implement 28 backlight levels")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20201214222210.238081-1-linus.walleij@linaro.org
This commit is contained in:
Linus Walleij 2020-12-14 23:22:10 +01:00
parent ce90f685bd
commit 1f20bf5921
1 changed files with 13 additions and 4 deletions
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17
drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
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@ -692,12 +692,12 @@ static const struct backlight_ops s6e63m0_backlight_ops = {
.update_status = s6e63m0_set_brightness,
};
static int s6e63m0_backlight_register(struct s6e63m0 *ctx)
static int s6e63m0_backlight_register(struct s6e63m0 *ctx, u32 max_brightness)
{
struct backlight_properties props = {
.type = BACKLIGHT_RAW,
.brightness = MAX_BRIGHTNESS,
.max_brightness = MAX_BRIGHTNESS
.brightness = max_brightness,
.max_brightness = max_brightness,
};
struct device *dev = ctx->dev;
int ret = 0;
@ -719,6 +719,7 @@ int s6e63m0_probe(struct device *dev,
bool dsi_mode)
{
struct s6e63m0 *ctx;
u32 max_brightness;
int ret;
ctx = devm_kzalloc(dev, sizeof(struct s6e63m0), GFP_KERNEL);
@ -734,6 +735,14 @@ int s6e63m0_probe(struct device *dev,
ctx->enabled = false;
ctx->prepared = false;
ret = device_property_read_u32(dev, "max-brightness", &max_brightness);
if (ret)
max_brightness = MAX_BRIGHTNESS;
if (max_brightness > MAX_BRIGHTNESS) {
dev_err(dev, "illegal max brightness specified\n");
max_brightness = MAX_BRIGHTNESS;
}
ctx->supplies[0].supply = "vdd3";
ctx->supplies[1].supply = "vci";
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
@ -753,7 +762,7 @@ int s6e63m0_probe(struct device *dev,
dsi_mode ? DRM_MODE_CONNECTOR_DSI :
DRM_MODE_CONNECTOR_DPI);
ret = s6e63m0_backlight_register(ctx);
ret = s6e63m0_backlight_register(ctx, max_brightness);
if (ret < 0)
return ret;