From: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Date: Wed, 27 May 2026 04:10:46 +0000 (+0530)
Subject: drm/i915/dp: Program AS SDP DB[1:0] for PR with Link off
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1f41dd467333e5d6e8ee1163dd35f7086624b200;p=thirdparty%2Fkernel%2Flinux.git

drm/i915/dp: Program AS SDP DB[1:0] for PR with Link off

For Panel Replay with AUX-less ALPM (link-off PR), the source must send
Adaptive-Sync SDP v2. Program DB[1:0] per DP spec v2.1:
- VRR AVT: 00b (variable VTotal)
- VRR FAVT: 10b/11b (TRR not reached/reached)
- Fixed timing with PR link-off (VRR off): 01b (AS disabled; VTotal fixed)

Also, drop the redundant target_rr assignment.

v2: Fix the else case. (Ville)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260527041050.601735-9-ankit.k.nautiyal@intel.com
---

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 53ba99f179c38..959e1575dffb7 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -3249,9 +3249,10 @@ static void intel_dp_compute_as_sdp(struct intel_dp *intel_dp,
 		as_sdp->mode = DP_AS_SDP_FAVT_TRR_REACHED;
 		as_sdp->target_rr = drm_mode_vrefresh(adjusted_mode);
 		as_sdp->target_rr_divider = true;
-	} else {
+	} else if (crtc_state->vrr.enable) {
 		as_sdp->mode = DP_AS_SDP_AVT_DYNAMIC_VTOTAL;
-		as_sdp->target_rr = 0;
+	} else {
+		as_sdp->mode = DP_AS_SDP_AVT_FIXED_VTOTAL;
 	}
 }