[PATCH i-g-t v2] lib/igt_kms: Introduce get_first_connected_output macro

[Vivek Kasireddy <vivek.kasireddy@intel.com>]

In some cases, we just need one valid (connected) output to perform
a test. This macro can help in these situations by not having to
put the test code inside a for loop that iterates over all the outputs.

v2: Added a brief documentation for this macro.

Suggested-by: Matt Roper <matthew.d.roper at intel.com>
Cc: Thomas Wood <thomas.wood@intel.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
---
 lib/igt_kms.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 965c47c..a0bb066 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -279,6 +279,18 @@ void igt_wait_for_vblank(int drm_fd, enum pipe pipe);
 	for (int i__ = 0; (plane) = &(display)->pipes[(pipe)].planes[i__], \
 		     i__ < (display)->pipes[(pipe)].n_planes; i__++)
 
+/**
+ * get_first_connected_output:
+ * @display: Initialized igt_display_t type object
+ * @output: igt_output_t type object
+ *
+ * Returns: First valid (connected) output.
+ */
+#define get_first_connected_output(display, output)		\
+	for (int i__ = 0;  i__ < (display)->n_outputs; i__++)	\
+		if ((output = &(display)->outputs[i__]), output->valid) \
+			break
+
 #define IGT_FIXED(i,f)	((i) << 16 | (f))
 
 void igt_enable_connectors(void);
-- 
2.4.3

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