drm/i915/psr: Avoid unnecessary DPCD read of DP_PSR_CAPS

intel_dp->psr_dpcd already has the required values.

Cc: Jose Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Tarun Vyas <tarun.vyas@intel.com>
Reviewed-by: Vathsala Nagaraju <vathsala.nagaraju@intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180511195145.3829-4-dhinakaran.pandiyan@intel.com

diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 26dbb60..4f34abc 100644 (file)
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -197,15 +197,6 @@ void intel_psr_irq_handler(struct drm_i915_private *dev_priv, u32 psr_iir)
        }
 }
 
-static bool intel_dp_get_y_coord_required(struct intel_dp *intel_dp)
-{
-       uint8_t psr_caps = 0;
-
-       if (drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_CAPS, &psr_caps) != 1)
-               return false;
-       return psr_caps & DP_PSR2_SU_Y_COORDINATE_REQUIRED;
-}
-
 static bool intel_dp_get_colorimetry_status(struct intel_dp *intel_dp)
 {
        uint8_t dprx = 0;
@@ -271,7 +262,7 @@ void intel_psr_init_dpcd(struct intel_dp *intel_dp)
                 * GTC first.
                 */
                dev_priv->psr.sink_psr2_support =
-                               intel_dp_get_y_coord_required(intel_dp);
+                       intel_dp->psr_dpcd[1] & DP_PSR2_SU_Y_COORDINATE_REQUIRED;
                DRM_DEBUG_KMS("PSR2 %ssupported\n",
                              dev_priv->psr.sink_psr2_support ? "" : "not ");