drm/i915/dp_mst: Disable Panel Replay

[ Upstream commit f2687d3 ]

Disable Panel Replay on MST links until it's properly implemented. For
instance the required VSC SDP is not programmed on MST and FEC is not
enabled if Panel Replay is enabled.

Fixes: 3257e55 ("drm/i915/panelreplay: enable/disable panel replay")
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/15174
Cc: Jouni Högander <[email protected]>
Cc: Animesh Manna <[email protected]>
Cc: [email protected] # v6.8+
Reviewed-by: Jouni Högander <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Link: https://patch.msgid.link/[email protected]
(cherry picked from commit e109f64)
Signed-off-by: Rodrigo Vivi <[email protected]>
[ placed MST check at function start since DPCD read was moved to caller ]
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: ideak

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

@@ -591,6 +591,10 @@ static void _panel_replay_init_dpcd(struct intel_dp *intel_dp)
 {
 	struct intel_display *display = to_intel_display(intel_dp);
 
+	/* TODO: Enable Panel Replay on MST once it's properly implemented. */
+	if (intel_dp->mst_detect == DRM_DP_MST)
+		return;
+
 	if (intel_dp_is_edp(intel_dp)) {
 		if (!intel_alpm_aux_less_wake_supported(intel_dp)) {
 			drm_dbg_kms(display->drm,