On Wed, Jan 29, 2025 at 03:21:53PM +0100, Maxime Ripard wrote:
> The light_up_connector helper function in the HDMI infrastructure unit
> tests uses drm_atomic_set_crtc_for_connector(), but fails when it
> returns an error.
>
> This function can return EDEADLK though if the sequence needs to be
> restarted, and WW_MUTEX_SLOWPATH is meant to test that we handle it
> properly.
>
> Let's handle EDEADLK and restart the sequence in our tests as well.
>
> Fixes: eb66d34d793e ("drm/tests: Add output bpc tests")
> Reported-by: Dave Airlie <airlied@xxxxxxxxx>
> Closes: https://lore.kernel.org/r/CAPM=9tzJ4-ERDxvuwrCyUPY0=+P44orhp1kLWVGL7MCfpQjMEQ@xxxxxxxxxxxxxx/
> Link: https://lore.kernel.org/r/20241031091558.2435850-1-mripard@xxxxxxxxxx
> Signed-off-by: Maxime Ripard <mripard@xxxxxxxxxx>
> ---
> drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 7 +++++++
> 1 file changed, 7 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 c3b693bb966f1f8b04066d19f520bfa4bf11c23d..e814b538c46c4d342604436beca64ac0bdb31526 100644
> --- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
> @@ -68,14 +68,21 @@ static int light_up_connector(struct kunit *test,
> int ret;
>
> state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
> KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
>
> +retry:
> conn_state = drm_atomic_get_connector_state(state, connector);
> KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state);
>
> ret = drm_atomic_set_crtc_for_connector(conn_state, crtc);
> + if (ret == -EDEADLK) {
> + drm_atomic_state_clear(state);
> + ret = drm_modeset_backoff(ctx);
> + if (!ret)
> + goto retry;
> + }
Reviewed-by: Simona Vetter <simona.vetter@xxxxxxxx>
> KUNIT_EXPECT_EQ(test, ret, 0);
>
> crtc_state = drm_atomic_get_crtc_state(state, crtc);
> KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state);
>
>
> --
> 2.47.1
>
--
Simona Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
