drm/i915/hsw: Drop the stereo 3D enabled check in psr_compute_config()

We should not access hardware while computing config also we don't
support stereo 3D so this test was never true.
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181121225441.18785-6-jose.souza@intel.com

drivers/gpu/drm/i915/intel_psr.c

@@ -552,13 +552,6 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
 		return;
 	}
 
-	if (IS_HASWELL(dev_priv) &&
-	    I915_READ(HSW_STEREO_3D_CTL(crtc_state->cpu_transcoder)) &
-		      S3D_ENABLE) {
-		DRM_DEBUG_KMS("PSR condition failed: Stereo 3D is Enabled\n");
-		return;
-	}
-
 	if (IS_HASWELL(dev_priv) &&
 	    adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
 		DRM_DEBUG_KMS("PSR condition failed: Interlaced is Enabled\n");