drm/i915/dp_mst: Disable Panel Replay

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: 3257e55d3ea7 ("drm/i915/panelreplay: enable/disable panel replay")
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/15174
Cc: Jouni Högander <jouni.hogander@intel.com>
Cc: Animesh Manna <animesh.manna@intel.com>
Cc: stable@vger.kernel.org # v6.8+
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20251107124141.911895-1-imre.deak@intel.com
(cherry picked from commit e109f644b871df8440c886a69cdce971ed533088)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index d5e0a1e66944b9635fa1e80fcc22425d6274dda9..4619237f13467eec4e8c2fd98847e606276e9884 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -585,6 +585,10 @@ static void _panel_replay_init_dpcd(struct intel_dp *intel_dp)
        struct intel_display *display = to_intel_display(intel_dp);
        int ret;
 
+       /* TODO: Enable Panel Replay on MST once it's properly implemented. */
+       if (intel_dp->mst_detect == DRM_DP_MST)
+               return;
+
        ret = drm_dp_dpcd_read_data(&intel_dp->aux, DP_PANEL_REPLAY_CAP_SUPPORT,
                                    &intel_dp->pr_dpcd, sizeof(intel_dp->pr_dpcd));
        if (ret < 0)