[PATCH v4 14/23] drm/tests: hdmi: Add macro to support EDEADLK handling

[Cristian Ciocaltea]

In preparation to improve error handling throughout all test cases,
introduce a macro to check for EDEADLK and automate the restart of the
atomic sequence.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea at collabora.com>
---
 drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
index c8969ee6518954ab4496d3a4398f428bf4104a36..c8bb131d63ea6d0c9e166c8d9ba5e403118cd9f1 100644
--- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
@@ -224,6 +224,16 @@ drm_kunit_helper_connector_hdmi_init(struct kunit *test,
 				test_edid_hdmi_1080p_rgb_max_200mhz);
 }
 
+#define drm_kunit_atomic_restart_on_deadlock(ret, state, ctx, start) do {	\
+	if (ret == -EDEADLK) {							\
+		if (state)							\
+			drm_atomic_state_clear(state);				\
+		ret = drm_modeset_backoff(ctx);					\
+		if (!ret)							\
+			goto start;						\
+	}									\
+} while (0)
+
 /*
  * Test that if we change the RGB quantization property to a different
  * value, we trigger a mode change on the connector's CRTC, which will

-- 
2.49.0