[PATCH 4/4] drm/i915/dp: read DPCD PSR capability only on eDP

Jani Nikula
2013-09-20T13:40:11Z

Reduce AUX transactions for non-eDP.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index dd780bf..f2e16a1 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2691,11 +2691,14 @@ 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 */
--
1.7.9.5