[igt-dev] [v3 i-g-t 07/14] tests/kms_atomic_transition: Fix mode selection for 2x tests

[Bhanuprakash Modem]

When two monitors connected through MST, the second monitor also
tries to use the same mode. So two such modes may not fit into the
link bandwidth.

This patch will find a combination of modes that fit into the BW.

Cc: Imre Deak <imre.deak at intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem at intel.com>
---
 tests/kms_atomic_transition.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tests/kms_atomic_transition.c b/tests/kms_atomic_transition.c
index be60940d7..dd3c26307 100644
--- a/tests/kms_atomic_transition.c
+++ b/tests/kms_atomic_transition.c
@@ -100,6 +100,7 @@ run_primary_test(data_t *data, enum pipe pipe, igt_output_t *output)
 	igt_plane_set_fb(primary, NULL);
 	igt_output_set_pipe(output, PIPE_NONE);
 	igt_remove_fb(data->drm_fd, &fb);
+	igt_display_commit2(&data->display, COMMIT_ATOMIC);
 }
 
 static void *fence_inc_thread(void *arg)
@@ -793,6 +794,7 @@ static void run_modeset_tests(data_t *data, int howmany, bool nonblocking, bool
 	for (i = 0; i < data->display.n_outputs; i++)
 		igt_output_set_pipe(&data->display.outputs[i], PIPE_NONE);
 
+retry:
 	for_each_connected_output(&data->display, output) {
 		drmModeModeInfo *mode = igt_output_get_mode(output);
 
@@ -839,6 +841,14 @@ static void run_modeset_tests(data_t *data, int howmany, bool nonblocking, bool
 
 	iter_max = 1 << j;
 
+	if (igt_display_try_commit_atomic(&data->display,
+				DRM_MODE_ATOMIC_TEST_ONLY |
+				DRM_MODE_ATOMIC_ALLOW_MODESET,
+				NULL) != 0) {
+		bool found = override_all_active_output_modes_to_fit_link_bw(&data->display);
+		igt_require_f(found, "No valid mode combo found.\n");
+		goto retry;
+	}
 	igt_display_commit2(&data->display, COMMIT_ATOMIC);
 
 	for (i = 0; i < iter_max; i++) {
-- 
2.20.1