[PATCH] tests/kms_writeback: refresh to expose writeback output

[Abhinav Kumar]

On 5/13/2024 2:30 PM, Alex Hung wrote:
> With dc2d7fb4f978, all kms_writeback subtests are skipped.
> 
> Refresh the outputs to grab all supported connectors,
> the writeback output that is just enabled.
> 

Can you please help to explain how the tests are getting skipped due to 
setting the client_cap?

And also why calling igt_display_reset_outputs() is fixing this issue?

> Fixes: dc2d7fb4f978 ("lib/igt_kms: move setting DRM_CLIENT_CAP_WRITEBACK_CONNECTORS to kms_writeback")
> Signed-off-by: Alex Hung <alex.hung at amd.com>
> ---
>   tests/kms_writeback.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/kms_writeback.c b/tests/kms_writeback.c
> index f89b2d62f..4c54f3b89 100644
> --- a/tests/kms_writeback.c
> +++ b/tests/kms_writeback.c
> @@ -572,9 +572,11 @@ igt_main_args("b:c:f:dl", long_options, help_str, opt_handler, NULL)
>   		igt_require(display.is_atomic);
>   
>   		ret = drmSetClientCap(display.drm_fd, DRM_CLIENT_CAP_WRITEBACK_CONNECTORS, 1);
> -

Is this part needed for this patch?

>   		igt_require_f(!ret, "error setting DRM_CLIENT_CAP_WRITEBACK_CONNECTORS\n");
>   
> +		/* Refresh the outputs to grab all supported connectors.*/
> +		igt_display_reset_outputs(&display);
> +
>   		output = kms_writeback_get_output(&display);
>   		igt_require(output);
>