[PATCH v4 3/3] drm/format-helper: Add KUnit tests for drm_fb_xrgb8888_to_gray8()

[José Expósito]

Hi Maxime,

Thanks for looking into the patches.

On Mon, Sep 19, 2022 at 09:36:45AM +0200, Maxime Ripard wrote:
> Hi,
> 
> On Mon, Sep 19, 2022 at 09:15:31AM +0200, José Expósito wrote:
> > Extend the existing test cases to test the conversion from XRGB8888 to
> > grayscale.
> > 
> > Tested-by: Maíra Canal <mairacanal at riseup.net>
> > Reviewed-by: David Gow <davidgow at google.com>
> > Signed-off-by: José Expósito <jose.exposito89 at gmail.com>
> > ---
> >  .../gpu/drm/tests/drm_format_helper_test.c    | 62 +++++++++++++++++++
> >  1 file changed, 62 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
> > index 09d358b54da0..71722e828abe 100644
> > --- a/drivers/gpu/drm/tests/drm_format_helper_test.c
> > +++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
> > @@ -37,6 +37,11 @@ struct convert_to_xrgb2101010_result {
> >  	const u32 expected[TEST_BUF_SIZE];
> >  };
> >  
> > +struct convert_to_gray8_result {
> > +	unsigned int dst_pitch;
> > +	const u8 expected[TEST_BUF_SIZE];
> > +};
> > +
> >
> > [...]
> >
> >  static struct kunit_case drm_format_helper_test_cases[] = {
> >  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgb332, convert_xrgb8888_gen_params),
> >  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgb565, convert_xrgb8888_gen_params),
> >  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgb888_test, convert_xrgb8888_gen_params),
> >  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_xrgb2101010_test, convert_xrgb8888_gen_params),
> > +	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_gray8_test, convert_xrgb8888_gen_params),
> 
> The trailing test feels redundant,

Why do you feel like it is redundant? Under the hood, most conversion
functions reuse the same code, but the *_line() function is unique and
I think that it is worth testing it.

> and we should order them
> alphabetically to avoid conflicts as much as possible.

Good point, I'll sort them alphabetically.

> Feel free to add my
> Acked-by: Maxime Ripard <maxime at cerno.tech>
> 
> And fix this while applying
> 
> Maxime

Thanks!
Jose