[PATCH i-g-t] tests/kms_plane_scaling: get mode only after setting the output pipe

[Sharma, Swati2]

Hi Luca,

Patch LGTM.
Reviewed-by: Swati Sharma <swati2.sharma at intel.com>

Please add "Closes" tag with valid gitlab issue# in commit.

On 10-01-2025 06:04 pm, Luca Coelho wrote:
> We find the mode before adding the dynamic intel-max-source-size
> subtests because we don't want to add substests that don't have a
> valid mode.  However, during the test itself, the mode info instance
> is not valid anymore, because it is deallocated when setting the
> output pipe.
>
> To solve this, we need to get the mode info _after_ setting the output
> pipe.  Avoid passing the mode to intel_max_source_size_test(), pass
> the entire invalid_paramtests struct and let the function find the
> correct mode info again.
>
> Signed-off-by: Luca Coelho <luciano.coelho at intel.com>
> ---
>   tests/kms_plane_scaling.c | 29 ++++++++++++++++++-----------
>   1 file changed, 18 insertions(+), 11 deletions(-)
>
> diff --git a/tests/kms_plane_scaling.c b/tests/kms_plane_scaling.c
> index 43f578d5553b..4e74f0e107df 100644
> --- a/tests/kms_plane_scaling.c
> +++ b/tests/kms_plane_scaling.c
> @@ -1271,15 +1271,26 @@ static drmModeModeInfo *find_mode(data_t *data, igt_output_t *output, const stru
>    *		max_dst_h = 8192
>    */
>   static void intel_max_source_size_test(data_t *d, enum pipe pipe, igt_output_t *output,
> -				       drmModeModeInfo *mode, const uint32_t planesize[])
> +				       const struct invalid_paramtests *param)
>   {
>   	igt_fb_t fb;
>   	igt_plane_t *plane;
>   	int rval;
> +	drmModeModeInfo *mode = NULL;
>   
>   	cleanup_crtc(d);
>   
>   	igt_output_set_pipe(output, pipe);
> +
> +	/*
> +	 * Need to get the mode again, because it may have changed
> +	 * after setting the pipe.
> +	 */
> +	mode = find_mode(d, output, param);
> +	igt_assert(mode);
> +	if (!mode)
> +		return;
> +
>   	igt_output_override_mode(output, mode);
>   	plane = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
>   
> @@ -1290,7 +1301,7 @@ static void intel_max_source_size_test(data_t *d, enum pipe pipe, igt_output_t *
>   
>   	igt_plane_set_position(plane, 0, 0);
>   	igt_plane_set_fb(plane, &fb);
> -	igt_plane_set_size(plane, planesize[0], planesize[1]);
> +	igt_plane_set_size(plane, param->planesize[0], param->planesize[1]);
>   
>   	rval = igt_display_try_commit2(&d->display, COMMIT_ATOMIC);
>   
> @@ -1563,27 +1574,23 @@ igt_main_args("", long_opts, help_str, opt_handler, &data)
>   				igt_require_intel(data.drm_fd);
>   				for_each_pipe(&data.display, pipe) {
>   					for_each_valid_output_on_pipe(&data.display, pipe, output) {
> -						drmModeModeInfo *mode = NULL;
> -
>   						if (get_num_scalers(&data.display, pipe) < 1)
>   							continue;
>   						/*
>   						 * Need to find mode with lowest vrefresh else
>   						 * we can exceed cdclk limits.
>   						 */
> -						mode = find_mode(&data, output, &intel_paramtests[index]);
> -						if (mode) {
> +						if (find_mode(&data, output, &intel_paramtests[index]))
>   							igt_dynamic_f("pipe-%s-%s",
> -								       kmstest_pipe_name(pipe), igt_output_name(output))
> -								intel_max_source_size_test(&data, pipe, output, mode,
> -											   intel_paramtests[index].planesize);
> -						} else {
> +								      kmstest_pipe_name(pipe), igt_output_name(output))
> +								intel_max_source_size_test(&data, pipe, output,
> +											   &intel_paramtests[index]);
> +						else
>   							igt_info("Unable to find the lowest " \
>   								 "refresh rate mode on output " \
>   								 "%s pipe %s\n",
>   								 igt_output_name(output),
>   								 kmstest_pipe_name(pipe));
> -						}
>   						continue;
>   					}
>   					break;