On Fri, 24 Jan 2025, Suraj Kandpal <suraj.kand...@intel.com> wrote:
> Check if we are capable of controlling brightness via Nits which
> is dependant on PANEL_LUMINANCE_OVERRIDE and SMOOTH_BRIGHTNESS
> capablility being set.
>
> Signed-off-by: Suraj Kandpal <suraj.kand...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_display_types.h | 1 +
> drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 9 +++++++++
> 2 files changed, 10 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 083eb86f0904..f900e1f2d93e 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -412,6 +412,7 @@ struct intel_panel {
> union {
> struct {
> struct drm_edp_backlight_info info;
> + bool nits_support;
> } vesa;
> struct {
> bool sdr_uses_aux;
> 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 09e82f24d030..c5ff6e044866 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> @@ -575,6 +575,15 @@ intel_dp_aux_supports_vesa_backlight(struct
> intel_connector *connector)
> {
> struct intel_display *display = to_intel_display(connector);
> struct intel_dp *intel_dp = intel_attached_dp(connector);
> + struct intel_panel *panel = &connector->panel;
> +
> + if ((intel_dp->edp_dpcd[2] & DP_EDP_PANEL_LUMINANCE_CONTROL_CAPABLE)) {
> + drm_dbg_kms(display->drm,
> + "[CONNECTOR:%d:%s] AUX Nits Based Backlight Control
> Supported!\n",
> + connector->base.base.id, connector->base.name);
> + panel->backlight.edp.vesa.nits_support = true;
Should we refer to luminance rather than nits here?
BR,
Jani.
> + return true;
> + }
>
> if (drm_edp_backlight_supported(intel_dp->edp_dpcd)) {
> drm_dbg_kms(display->drm,
--
Jani Nikula, Intel
