Re: [PATCH 02/14] drm/i915/vrr: Avoid vrr for PCON with HDMI2.1 sink

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Mon, Feb 23, 2026 at 07:14:19PM +0530, Ankit Nautiyal wrote:
> Currently we do not support VRR with HDMI so skip vrr compute
> config step for all DP branch devices.
> 
> v2: Restrict VRR on all DP branch devices instead for checking only for
>     HDMI. (Ville)
> 
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_vrr.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
> index 00ca76dbdd6c..c1d8b32ef42f 100644
> --- a/drivers/gpu/drm/i915/display/intel_vrr.c
> +++ b/drivers/gpu/drm/i915/display/intel_vrr.c
> @@ -55,6 +55,16 @@ bool intel_vrr_is_capable(struct intel_connector *connector)
>  		if (connector->mst.dp)
>  			return false;
>  		intel_dp = intel_attached_dp(connector);
> +		/*
> +		 * Among non-MST DP branch devices, only an HDMI 2.1 sink connected
> +		 * via a PCON could support VRR. However, supporting VRR through a
> +		 * PCON requires non-trivial changes that are not implemented yet.
> +		 * Until that support exists, avoid VRR on all DP branch devices.
> +		 *
> +		 * TODO: Add support for VRR for DP->HDMI 2.1 PCON.
> +		 */
> +		if (drm_dp_is_branch(intel_dp->dpcd))
> +			return false;
>  
>  		if (!drm_dp_sink_can_do_video_without_timing_msa(intel_dp->dpcd))
>  			return false;
> -- 
> 2.45.2

-- 
Ville Syrjälä
Intel