[PATCH i-g-t v4 5/5] lib/igt_kms: Add function to get valid pipe for specific output

[Louis Chauvet]

Introduces a new function igt_get_pipe_for_output in igt_kms. The function
is designed to retrieve a valid pipe for a specific output in a display.

Signed-off-by: Louis Chauvet <louis.chauvet at bootlin.com>
---
 lib/igt_kms.c | 22 ++++++++++++++++++++++
 lib/igt_kms.h |  1 +
 2 files changed, 23 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index f6d9341b75b4fc8dfa614478cd3bf35510f9ecea..d6cd6833ef24a914da6e0234dd7eea40867df452 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -7458,3 +7458,25 @@ uint32_t igt_get_connector_id_from_mst_path(int drm_fd, const void *mst_path)
 
 	return 0;
 }
+
+/**
+ * igt_get_pipe_for_output:
+ * @display: display to fetch the pipes
+ * @output: output to use
+ *
+ * Get a valid pipe for a specific output. The return value is the pipe first valid pipe for a
+ * specific output.
+ */
+enum pipe igt_get_pipe_for_output(igt_display_t *display,
+				  igt_output_t *output)
+{
+	enum pipe pipe;
+
+	for_each_pipe(display, pipe) {
+		if (igt_output_is_connected(output) &&
+		     (output->config.valid_crtc_idx_mask & (1 << (pipe))))
+			return pipe;
+	}
+
+	return PIPE_NONE;
+}
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 3be9068384aa118461dd090224d15aa5c979ac06..60a90500048dd83620c8a6ed08b70d5ddb020bbc 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -1285,5 +1285,6 @@ int igt_get_connected_connectors(int drm_fd, uint32_t **connector_ids);
 drmModeConnectorPtr igt_get_connector_from_name(int drm_fd, const char *port_name);
 uint32_t igt_get_connector_id_from_name(int drm_fd, const char *port_name);
 uint32_t igt_get_connector_id_from_mst_path(int drm_fd, const void *mst_path);
+enum pipe igt_get_pipe_for_output(igt_display_t *display, igt_output_t *output);
 
 #endif /* __IGT_KMS_H__ */

-- 
2.47.1