[igt-dev] [PATCH i-g-t 3/3] tests/kms_plane_scaling: Add test to validate max source size

[Juha-Pekka Heikkila]

On 15.2.2023 18.59, Swati Sharma wrote:
> i915 specific test is added to validate max source size. This
> test is expected to return -EINVAL for platforms where we have
> max source width 4096 whereas it will pass on platforms having
> max source width 5120. We have created fb of size 5120x4320
> (=size of source) and downscaled to 3840x2400(=size of dest).
> 
> On MTL(disp_ver=14), in dmesg we can see
> "[drm:skl_update_scaler [i915]] scaler_user index 0.0: src
> 5120x4320 dst 3840x2400 size is out of scaler range."
> since max source width supported is 4096.
> whereas same test will pass on ADLP(display_ver=13) since max
> source width  supported is 5120.
> 
> Signed-off-by: Swati Sharma <swati2.sharma at intel.com>
> ---
>   tests/kms_plane_scaling.c | 94 +++++++++++++++++++++++++++++++++++++++
>   1 file changed, 94 insertions(+)
> 
> diff --git a/tests/kms_plane_scaling.c b/tests/kms_plane_scaling.c
> index 9737d8645..ae917b202 100644
> --- a/tests/kms_plane_scaling.c
> +++ b/tests/kms_plane_scaling.c
> @@ -890,6 +890,95 @@ static void invalid_parameter_tests(data_t *d)
>   	}
>   }
>   
> +/*
> + *	Max source/destination width/height
> + *	for i915 driver.
> + *
> + *	DISPLAY_VER < 11
> + *		max_src_w = 4096
> + *		max_src_h = 4096
> + *		max_dst_w = 4096
> + *		max_dst_h = 4096
> + *
> + *	DISPLAY_VER = 11
> + *		max_src_w = 5120
> + *		max_src_h = 4096
> + *		max_dst_w = 5120
> + *		max_dst_h = 4096
> + *
> + *	DISPLAY_VER = 12-13
> + *		max_src_w = 5120
> + *		max_src_h = 8192
> + *		max_dst_w = 8192
> + *		max_dst_h = 8192
> + *
> + *	DISPLAY_VER = 14
> + *		max_src_w = 4096
> + *		max_src_h = 8192
> + *		max_dst_w = 8192
> + *		max_dst_h = 8192

I think here could be added comment these numbers are coming from 
drivers/gpu/drm/i915/display/skl_scaler.c in kernel sources

> + */
> +
> +static void i915_max_source_size_test(data_t *d)
> +{
> +	enum pipe pipe = PIPE_A;
> +	igt_output_t *output;
> +	igt_fb_t fb;
> +	igt_plane_t *plane;
> +	int rval;
> +
> +	static const struct invalid_paramtests paramtests[1] = {

"static const struct invalid_paramtests paramtests[]" would be better 
here, ie. not declaring here how long is the list of tests

> +		{
> +			.testname = "max-src-size",
> +			.planesize = {3840, 2400},
> +			.params = {{~0}}
> +		},
> +	};
> +
> +	igt_fixture {
> +		output = igt_get_single_output_for_pipe(&d->display, pipe);
> +		igt_require(output);
> +
> +		igt_output_set_pipe(output, pipe);
> +		plane = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
> +
> +		igt_create_fb(d->drm_fd, 5120, 4320,
> +			DRM_FORMAT_XRGB8888,
> +			DRM_FORMAT_MOD_NONE,
> +			&fb);

above indentation is off on those lines with parameters.

> +	}
> +
> +	igt_describe("test for validating max source size.");
> +	igt_subtest_with_dynamic("i915-max-source-size") {
> +		for (uint32_t i = 0; i < ARRAY_SIZE(paramtests); i++) {
> +			igt_dynamic(paramtests[i].testname) {
> +				igt_plane_set_position(plane, 0, 0);
> +				igt_plane_set_fb(plane, &fb);
> +				igt_plane_set_size(plane,
> +							paramtests[i].planesize[0],
> +							paramtests[i].planesize[1]);
> +
> +				for (uint32_t j = 0; paramtests[i].params[j].prop != ~0; j++)
> +					igt_plane_set_prop_value(plane,
> +								 paramtests[i].params[j].prop,
> +								 paramtests[i].params[j].value);
> +
> +				rval = igt_display_try_commit2(&d->display, COMMIT_ATOMIC);
> +
> +				if (intel_display_ver(d->devid) < 11 || intel_display_ver(d->devid) >= 14)
> +					igt_assert(rval == -EINVAL || rval == -ERANGE);
> +				else
> +					igt_assert_eq(rval, 0);
> +			}
> +		}
> +	}
> +
> +	igt_fixture {
> +		igt_remove_fb(d->drm_fd, &fb);
> +		igt_output_set_pipe(output, PIPE_NONE);
> +	}
> +}
> +
>   static int opt_handler(int opt, int opt_index, void *_data)
>   {
>   	data_t *data = _data;
> @@ -1055,6 +1144,11 @@ igt_main_args("", long_opts, help_str, opt_handler, &data)
>   
>   	invalid_parameter_tests(&data);
>   
> +	igt_fixture
> +		igt_require_f(data.devid, "This test is valid only for i915 devices.\n");
> +
> +	i915_max_source_size_test(&data);
> +

These above changes I think could be wrapped inside igt_subtest_group so 
that i915 requirement doesn't become inherited if someone come add 
something here after this test.

>   	igt_fixture {
>   		igt_display_fini(&data.display);
>   		close(data.drm_fd);