Re: [igt-dev] [PATCH i-g-t] tests/kms_display_modes: Fixed mode selection for extended mode tests

["Modem, Bhanuprakash" <bhanuprakash.modem@intel.com>]

On Tue-30-08-2022 05:11 pm, Mohammed Thasleem wrote:
> Added check on ENOSPC and EINVAL when two moniters connected
> through MST.
> This will find the connector mode combo that fits into the
> bandwidth when more than one monitor is connected.
> 
> Example:
>    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. So, iterate through connected
>    outputs & modes and find a combination of modes those fit
>    into the link BW.
> 
> v2: -Updated commit msg and description. (Bhanu)
>      -Renamed restart with retry. (Bhanu)
>      -Moved igt_pipe_crc_new before retry. (Bhanu)
>      -Removed unrelated changes and new line. (Bhanu)
>      -Minor changes.
> v3: Updated discription and added EINVAL check.
> 
> Signed-off-by: Mohammed Thasleem <mohammed.thasleem@intel.com>
> Reviewed-by: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
> ---
>   tests/kms_display_modes.c | 27 +++++++++++++++++++++++----
>   1 file changed, 23 insertions(+), 4 deletions(-)
> 
> diff --git a/tests/kms_display_modes.c b/tests/kms_display_modes.c
> index e4191811e..7d4f64e0d 100644
> --- a/tests/kms_display_modes.c
> +++ b/tests/kms_display_modes.c
> @@ -43,7 +43,7 @@ static void run_extendedmode_basic(data_t *data, int pipe1, int pipe2)
>   	igt_plane_t *plane[2];
>   	igt_pipe_crc_t *pipe_crc[2] = { 0 };
>   	igt_crc_t ref_crc[2], crc[2];
> -	int count = 0, width, height;
> +	int count = 0, width, height, ret;
>   	cairo_t *cr;
>   
>   	for_each_connected_output(display, output) {
> @@ -54,14 +54,16 @@ static void run_extendedmode_basic(data_t *data, int pipe1, int pipe2)
>   			break;
>   	}
>   
> +	pipe_crc[0] = igt_pipe_crc_new(data->drm_fd, pipe1, IGT_PIPE_CRC_SOURCE_AUTO);
> +	pipe_crc[1] = igt_pipe_crc_new(data->drm_fd, pipe2, IGT_PIPE_CRC_SOURCE_AUTO);
> +
> +retry:
>   	igt_output_set_pipe(extended_output[0], pipe1);
>   	igt_output_set_pipe(extended_output[1], pipe2);
>   
>   	mode[0] = igt_output_get_mode(extended_output[0]);
>   	mode[1] = igt_output_get_mode(extended_output[1]);
>   
> -	pipe_crc[0] = igt_pipe_crc_new(data->drm_fd, pipe1, IGT_PIPE_CRC_SOURCE_AUTO);
> -	pipe_crc[1] = igt_pipe_crc_new(data->drm_fd, pipe2, IGT_PIPE_CRC_SOURCE_AUTO);
>   
>   	igt_create_color_fb(data->drm_fd, mode[0]->hdisplay, mode[0]->vdisplay,
>   			     DRM_FORMAT_XRGB8888, 0, 1, 0, 0, &fbs[0]);
> @@ -79,7 +81,24 @@ static void run_extendedmode_basic(data_t *data, int pipe1, int pipe2)
>   	igt_fb_set_size(&fbs[1], plane[1], mode[1]->hdisplay, mode[1]->vdisplay);
>   	igt_plane_set_size(plane[1], mode[1]->hdisplay, mode[1]->vdisplay);
>   
> -	igt_display_commit2(display, COMMIT_ATOMIC);
> +	ret = igt_display_try_commit2(display, COMMIT_ATOMIC);
> +
> +	/* In case of DP-MST find suitable mode(s) to fit into the link BW. */
> +	if (ret != 0 && (errno == ENOSPC || errno == EINVAL)) {

Why EINVAL?

> +		bool found = igt_override_all_active_output_modes_to_fit_bw(display);
> +
> +		igt_require_f(found, "No valid mode combo found.\n");
> +
> +		for_each_connected_output(display, output)
> +			igt_output_set_pipe(output, PIPE_NONE);
> +
> +		igt_remove_fb(data->drm_fd, &fbs[0]);
> +		igt_remove_fb(data->drm_fd, &fbs[1]);
> +
> +		goto retry;
> +	}
> +
> +	igt_assert(!ret);
>   
>   	igt_pipe_crc_collect_crc(pipe_crc[0], &ref_crc[0]);
>   	igt_pipe_crc_collect_crc(pipe_crc[1], &ref_crc[1]);