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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>
This commit is contained in:
Jani Nikula 2013-09-20 16:42:17 +03:00 committed by Daniel Vetter
parent 2b9966771d
commit 50003939b5
1 changed files with 8 additions and 5 deletions
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13
drivers/gpu/drm/i915/intel_dp.c
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@ -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 */