drm/i915: More checks for psr.enabled

We need to make sure that no one else is using this in the
enable function and also that the work item hasn't raced
with the disabled function.

v2: Improve bisectability by moving one hunk to an earlier patch.

v3: added missing dev_priv declaration (Rodrigo)
Reviewed-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> (v2)
Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dp.c

@@ -1850,6 +1850,7 @@ static void intel_edp_psr_do_enable(struct intel_dp *intel_dp)
 void intel_edp_psr_enable(struct intel_dp *intel_dp)
 {
 	struct drm_device *dev = intel_dp_to_dev(intel_dp);
+	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	if (!HAS_PSR(dev)) {
 		DRM_DEBUG_KMS("PSR not supported on this platform\n");
@@ -1861,6 +1862,11 @@ void intel_edp_psr_enable(struct intel_dp *intel_dp)
 		return;
 	}
 
+	if (dev_priv->psr.enabled) {
+		DRM_DEBUG_KMS("PSR already in use\n");
+		return;
+	}
+
 	/* Setup PSR once */
 	intel_edp_psr_setup(intel_dp);