[PATCH i-g-t 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 | 19 +++++++++++++++++++
 lib/igt_kms.h |  1 +
 2 files changed, 20 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 45587a4bb9e6..d9dafe7ef24c 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -6918,3 +6918,22 @@ uint32_t igt_get_connector_id_from_mst_path(int drm_fd, const void *mst_path)
 	drmModeFreeResources(res);
 	return 0;
 }
+
+/**
+ * igt_get_pipe_for_output - Get a valid pipe for a specific output
+ * @display: display to fetch the pipes
+ * @output: output to use
+ */
+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;
+	}
+
+	igt_assert_f(false, "No pipe found for output %s\n", igt_output_name(output));
+}
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 0b7dc7e9a3ed..e2ad4af8439a 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -1240,5 +1240,6 @@ 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__ */

-- 
2.44.2