[PATCH i-g-t] tests/kms_plane_lowres: Test only with one plane

[Mika Kahola]

The test is intended to test resolution changes from higher to
lower and back. We can do this with only one plane and we don't
need to run through all planes. This will save significant amount
of test execution time.

Signed-off-by: Mika Kahola <mika.kahola at intel.com>
---
 tests/kms_plane_lowres.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tests/kms_plane_lowres.c b/tests/kms_plane_lowres.c
index 4c3f5636..ee6fb1fb 100644
--- a/tests/kms_plane_lowres.c
+++ b/tests/kms_plane_lowres.c
@@ -208,7 +208,8 @@ test_planes_on_pipe_with_output(data_t *data, enum pipe pipe,
 		igt_assert_crc_equal(&data->ref_lowres.crc, &crc_lowres);
 
 		igt_plane_set_fb(plane, NULL);
-		tested++;
+		if (tested++)
+			break;
 	}
 
 	igt_pipe_crc_free(pipe_crc);
-- 
2.17.1