[PATCH 2/2] drm/i915/backlight: Modify condition to use panel luminance

[Murthy, Arun R]

On 08-04-2025 10:31, Suraj Kandpal wrote:
> According to our internal spec we need to now check if both
> panel luminance and smooth brightness are available in panel for
> us to be able to change brightness using luminance value.
>
> Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
> ---

Reviewed-by: Arun R Murthy <arun.r.murthy at intel.com>

Thanks and Regards,
Arun R Murthy
--------------------

>   drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> index 8173de8aec63..20ab90acb351 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> @@ -663,7 +663,8 @@ intel_dp_aux_supports_vesa_backlight(struct intel_connector *connector)
>   	struct intel_dp *intel_dp = intel_attached_dp(connector);
>   	struct intel_panel *panel = &connector->panel;
>   
> -	if ((intel_dp->edp_dpcd[3] & DP_EDP_PANEL_LUMINANCE_CONTROL_CAPABLE)) {
> +	if ((intel_dp->edp_dpcd[3] & DP_EDP_PANEL_LUMINANCE_CONTROL_CAPABLE) &&
> +	    (intel_dp->edp_dpcd[3] & DP_EDP_SMOOTH_BRIGHTNESS_CAPABLE)) {
>   		drm_dbg_kms(display->drm,
>   			    "[CONNECTOR:%d:%s] AUX Luminance Based Backlight Control Supported!\n",
>   			    connector->base.base.id, connector->base.name);