| Message ID | 20201214222210.238081-1-linus.walleij@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/panel: s6e63m0: Support max-brightness | expand |
Hi Linus. On Mon, Dec 14, 2020 at 11:22:10PM +0100, Linus Walleij wrote: > 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: 9c3f0a0dd6a1 ("drm/panel: s6e63m0: Implement 28 backlight levels") > Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Looks good. backlight_properties.max_brightness is an int, but this looks like a sub-optimal type so the use of u32 in this patch is fine. Reviewed-by: Sam Ravnborg <sam@ravnborg.org> As we are in the merge window it should be drm-next-fixes material, but you may have to wait until -rc2 before the drm-next-fixes branched is ready. Sam > --- > drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 17 +++++++++++++---- > 1 file changed, 13 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c > index bf6d704d4d27..603c5dfe8768 100644 > --- a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c > +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c > @@ -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; > > -- > 2.29.2
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c index bf6d704d4d27..603c5dfe8768 100644 --- a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c @@ -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;
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: 9c3f0a0dd6a1 ("drm/panel: s6e63m0: Implement 28 backlight levels") Signed-off-by: Linus Walleij <linus.walleij@linaro.org> --- drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-)