[Intel-gfx] [RFC 4/7] drm/i915: Add checks specific to async flips

[Karthik B S <karthik.b.s@intel.com>]

Support added only for async flips on primary plane.
If flip is requested on any other plane, reject it.

Signed-off-by: Karthik B S <karthik.b.s@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 29 ++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 25fad5d01e67..a8de08c3773e 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -14732,6 +14732,31 @@ static bool intel_cpu_transcoders_need_modeset(struct intel_atomic_state *state,
 	return false;
 }
 
+static int intel_atomic_check_async(struct intel_atomic_state *state)
+{
+	struct drm_plane *plane;
+	struct drm_plane_state *plane_state;
+	struct intel_crtc_state *crtc_state;
+	struct intel_crtc *crtc;
+	int i, j;
+
+	/*FIXME: Async flip is only supported for primary plane currently
+	 * Support for overlays to be added.
+	 */
+	for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
+		if (crtc_state->uapi.async_flip) {
+			for_each_new_plane_in_state(&state->base,
+						    plane, plane_state, j) {
+				if (plane->type != DRM_PLANE_TYPE_PRIMARY) {
+					DRM_ERROR("Async flips is NOT supported for non-primary plane\n");
+					return -EINVAL;
+				}
+			}
+		}
+	}
+	return 0;
+}
+
 /**
  * intel_atomic_check - validate state object
  * @dev: drm device
@@ -14760,6 +14785,10 @@ static int intel_atomic_check(struct drm_device *dev,
 	if (ret)
 		goto fail;
 
+	ret = intel_atomic_check_async(state);
+	if  (ret)
+		goto fail;
+
 	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
 					    new_crtc_state, i) {
 		if (!needs_modeset(new_crtc_state)) {
-- 
2.22.0

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