Commit f87abd0c authored by Ankit Nautiyal's avatar Ankit Nautiyal Committed by Tvrtko Ursulin
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drm/i915/dp: Fix readback for target_rr in Adaptive Sync SDP 



Correct the bit-shift logic to properly readback the 10 bit target_rr from
DB3 and DB4.

v2: Align the style with readback for vtotal. (Ville)

Fixes: 12ea8929 ("drm/i915/dp: Add Read/Write support for Adaptive Sync SDP")
Cc: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: default avatarAnkit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260511123218.1589830-2-ankit.k.nautiyal@intel.com


(cherry picked from commit f7abc4af2b19240a145a221461dfe756cc01d74a)
Signed-off-by: default avatarTvrtko Ursulin <tursulin@ursulin.net>
parent 86ed2d96

drivers/gpu/drm/i915/display/intel_dp.c

+1 −1
Original line number Diff line number Diff line
@@ -5303,7 +5303,7 @@ int intel_dp_as_sdp_unpack(struct drm_dp_as_sdp *as_sdp, 
	as_sdp->length = sdp->sdp_header.HB3 & DP_ADAPTIVE_SYNC_SDP_LENGTH;

	as_sdp->mode = sdp->db[0] & DP_ADAPTIVE_SYNC_SDP_OPERATION_MODE;

	as_sdp->vtotal = (sdp->db[2] << 8) | sdp->db[1];

	as_sdp->target_rr = (u64)sdp->db[3] | ((u64)sdp->db[4] & 0x3);

	as_sdp->target_rr = ((sdp->db[4] & 0x3) << 8) | sdp->db[3];

	as_sdp->target_rr_divider = sdp->db[4] & 0x20 ? true : false;



	return 0;