linux-kernel - Re: [RFC PATCH 1/1] drm/format-helper: Add KUnit tests for drm_fb_xrgb8888_to

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Date:   Mon, 30 May 2022 15:11:58 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     José Expósito <jose.exposito89@...il.com>
Cc:     javierm@...hat.com, tzimmermann@...e.de,
        maarten.lankhorst@...ux.intel.com, airlied@...ux.ie,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/1] drm/format-helper: Add KUnit tests for
 drm_fb_xrgb8888_to_rgb332()


Hi,

On Mon, May 30, 2022 at 12:20:17PM +0200, José Expósito wrote:
> Test the conversion from XRGB8888 to RGB332.
> 
> What is tested?
> 
>  - Different values for the X in XRGB8888 to make sure it is ignored
>  - Different clip values: Single pixel and full and partial buffer
>  - Well know colors: White, black, red, green, blue, magenta, yellow
>    and cyan
>  - Other colors: Randomly picked
>  - Destination pitch
> 
> Suggested-by: Javier Martinez Canillas <javierm@...hat.com>
> Signed-off-by: José Expósito <jose.exposito89@...il.com>

It looks mostly good to me, but I think we should Cc
kunit-dev@...glegroups.com to have their feedback.

> ---
>  drivers/gpu/drm/Kconfig                  |  12 ++
>  drivers/gpu/drm/Makefile                 |   3 +
>  drivers/gpu/drm/drm_format_helper_test.c | 166 +++++++++++++++++++++++
>  3 files changed, 181 insertions(+)
>  create mode 100644 drivers/gpu/drm/drm_format_helper_test.c
> 
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index e88c497fa010..d92be6faef15 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -76,6 +76,18 @@ config DRM_KMS_HELPER
>  	help
>  	  CRTC helpers for KMS drivers. 
>  
> +config DRM_FORMAR_HELPER_TEST
> +	bool "drm_format_helper tests" if !KUNIT_ALL_TESTS
> +	depends on DRM && KUNIT=y
> +	select DRM_KMS_HELPER
> +	default KUNIT_ALL_TESTS
> +	help
> +	  KUnit tests for the drm_format_helper APIs. This option is not
> +	  useful for distributions or general kernels, but only for kernel
> +	  developers working on DRM and associated drivers.
> +
> +	  If in doubt, say "N".
> +

AFAIK, kunit test cases are supposed to have a .kunitconfig too to
enable the kunit tests easily.

Maxime