From: Ankit Nautiyal Date: Fri, 24 Apr 2026 09:09:40 +0000 (+0530) Subject: drm/i915/vrr: Avoid vrr for PCON with HDMI2.1 sink X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=60656fa8feb07bc767cb3cce1ae40d1d560f8b06;p=thirdparty%2Fkernel%2Flinux.git drm/i915/vrr: Avoid vrr for PCON with HDMI2.1 sink 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 Reviewed-by: Ville Syrjälä Link: https://patch.msgid.link/20260424090942.3060291-2-ankit.k.nautiyal@intel.com --- diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c index fae1186a90b2..1b09992ce9fd 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;