drm/i915/dp: read DPCD PSR capability only on eDP

Reduce AUX transactions for non-eDP.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Todd Previte <tprevite@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 7823a1b5c7a6e1a2d539dc4049d268310d9a772b..5a937fcd3a6947dd5e2f4b8c6e760c6cf6915769 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2686,11 +2686,14 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
 
        /* Check if the panel supports PSR */
        memset(intel_dp->psr_dpcd, 0, sizeof(intel_dp->psr_dpcd));
-       intel_dp_aux_native_read_retry(intel_dp, DP_PSR_SUPPORT,
-                                      intel_dp->psr_dpcd,
-                                      sizeof(intel_dp->psr_dpcd));
-       if (is_edp_psr(intel_dp))
-               DRM_DEBUG_KMS("Detected EDP PSR Panel.\n");
+       if (is_edp(intel_dp)) {
+               intel_dp_aux_native_read_retry(intel_dp, DP_PSR_SUPPORT,
+                                              intel_dp->psr_dpcd,
+                                              sizeof(intel_dp->psr_dpcd));
+               if (is_edp_psr(intel_dp))
+                       DRM_DEBUG_KMS("Detected EDP PSR Panel.\n");
+       }
+
        if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
              DP_DWN_STRM_PORT_PRESENT))
                return true; /* native DP sink */