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

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 3decc190d2acd50d7fd732d7b847d44835f13493..66d94e25fd96f8ccca5f83287991231b5ccf6436 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -625,6 +625,10 @@ 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)