[PATCH i-g-t 1/2] lib/igt_kms: Add helper to get non-joiner mode

[Pranay Samala <pranay.samala@intel.com>]

Add igt_get_non_joiner_mode() helper function to find a suitable
display mode from an output that does not require Big Joiner or
Ultra Joiner support. This is useful for tests that want to avoid
joiner modes and use a single pipe configuration.

The function returns a pointer to the mode if found, or NULL if
all modes require joiner support.

Signed-off-by: Pranay Samala <pranay.samala@intel.com>
---
 lib/igt_kms.c | 31 +++++++++++++++++++++++++++++++
 lib/igt_kms.h |  1 +
 2 files changed, 32 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 5c4879604..107db512d 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -6997,6 +6997,37 @@ bool ultrajoiner_mode_found(int drm_fd, drmModeConnector *connector,
 	return found;
 }
 
+/**
+ * igt_get_non_joiner_mode:
+ * @drm_fd: drm file descriptor
+ * @output: pointer to the output structure
+ *
+ * Finds the display mode from the output that does not require
+ * Big Joiner or Ultra Joiner.
+ *
+ * Returns: Pointer to non-joiner mode, or NULL if not found.
+ */
+drmModeModeInfo *igt_get_non_joiner_mode(int drm_fd, igt_output_t *output)
+{
+	drmModeConnector *connector;
+	int max_dotclock;
+
+	connector = output->config.connector;
+	max_dotclock = igt_get_max_dotclock(drm_fd);
+
+	for (int i = 0; i < connector->count_modes; i++) {
+		drmModeModeInfo *current_mode = &connector->modes[i];
+
+		/* Check if mode requires joiner */
+		if (!igt_bigjoiner_possible(drm_fd, current_mode, max_dotclock) &&
+		    !igt_ultrajoiner_possible(drm_fd, current_mode, max_dotclock)) {
+			return current_mode;
+		}
+	}
+
+	return NULL;
+}
+
 /**
  * is_joiner_mode:
  * @drm_fd: drm file descriptor
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index dedc3f880..9a95e8e0a 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -1285,6 +1285,7 @@ bool igt_is_joiner_enabled_for_pipe(int drmfd, enum pipe pipe);
 bool igt_ultrajoiner_possible(int drmfd, drmModeModeInfo *mode, int max_dotclock);
 bool ultrajoiner_mode_found(int drm_fd, drmModeConnector *connector,
 			  int max_dotclock, drmModeModeInfo *mode);
+drmModeModeInfo *igt_get_non_joiner_mode(int drm_fd, igt_output_t *output);
 bool igt_has_force_joiner_debugfs(int drmfd, char *conn_name);
 bool is_joiner_mode(int drm_fd, igt_output_t *output);
 bool igt_check_force_joiner_status(int drmfd, char *connector_name);
-- 
2.34.1