[Intel-gfx] [PATCH] drm/i915/cnp: set min brightness from VBT

[Jani Nikula]

On Wed, 13 Sep 2017, "Lee, Shawn C" <shawn.c.lee at intel.com> wrote:
> Min brightness value from vbt was missing for CNP platform.
> This setting have to refer backlight ic spec to restrict
> min backlight output. Without this restriction, driver would
> allow to configure lower brightness value and violate
> backlight ic requirement.
>
> Fixes: 4c9f7086ac6d ("drm/i915/cnp: Backlight support for CNP.")
> Cc: Jani Nikula <jani.nikula at intel.com>
> Signed-off-by: Shawn Lee <shawn.c.lee at intel.com>

Pushed, thanks for the patch.

BR,
Jani.

> ---
>  drivers/gpu/drm/i915/intel_panel.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> index d4dd248ac9a8..3b1c5d783ee7 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -1737,6 +1737,8 @@ cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
>  	if (!panel->backlight.max)
>  		return -ENODEV;
>  
> +	panel->backlight.min = get_backlight_min_vbt(connector);
> +
>  	val = bxt_get_backlight(connector);
>  	val = intel_panel_compute_brightness(connector, val);
>  	panel->backlight.level = clamp(val, panel->backlight.min,

-- 
Jani Nikula, Intel Open Source Technology Center