[PATCH i-g-t 11/19] lib/kms: Introduce for_each_plane_on_crtc()

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Add for_each_plane_on_crtc() as the crtc based replacement
for for_each_plane_on_pipe().

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 lib/igt_kms.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 9dc933d537ef..39e006a28e9e 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -829,6 +829,19 @@ igt_output_t **__igt_pipe_populate_outputs(igt_display_t *display,
 		     (plane) = &igt_crtc_for_pipe((display), (pipe))->planes[j__], \
 		     j__ < igt_crtc_for_pipe((display), (pipe))->n_planes; j__++)
 
+/**
+ * for_each_plane_on_crtc:
+ * @crtc: CRTC to enumerate valid outputs over
+ * @plane: The enumerated plane.
+ *
+ * This for loop iterates over all planes associated to the given @crtc.
+ * If there are no valid planes for this CRTC, nothing happens.
+ */
+#define for_each_plane_on_crtc(crtc, plane) \
+	for (int j__ = 0; assert(igt_can_fail()), \
+		     (plane) = &(crtc)->planes[j__], \
+		     j__ < (crtc)->n_planes; j__++)
+
 /**
  * for_each_connector_mode:
  * @output: Output to enumerate available modes.
-- 
2.52.0