Re: [PATCH v2 1/4] drm/tests: helpers: Add helper for drm_display_mode_from_cea_vic()

[Maxime Ripard]

On Thu, Oct 17, 2024 at 09:33:07AM GMT, Jinjie Ruan wrote:
> >> diff --git a/include/drm/drm_kunit_helpers.h b/include/drm/drm_kunit_helpers.h
> >> index e7cc17ee4934..1e7fd4be550c 100644
> >> --- a/include/drm/drm_kunit_helpers.h
> >> +++ b/include/drm/drm_kunit_helpers.h
> >> @@ -4,6 +4,7 @@
> >>  #define DRM_KUNIT_HELPERS_H_
> >>  
> >>  #include <drm/drm_drv.h>
> >> +#include <drm/drm_edid.h>
> >>
> >>  #include <linux/device.h>
> >>  
> >> @@ -120,4 +121,9 @@ drm_kunit_helper_create_crtc(struct kunit *test,
> >>  			     const struct drm_crtc_funcs *funcs,
> >>  			     const struct drm_crtc_helper_funcs *helper_funcs);
> >>  
> >> +struct drm_display_mode *
> >> +drm_kunit_helper_display_mode_from_cea_vic(struct kunit *test,
> >> +					   struct drm_device *dev,
> >> +					   u8 video_code);
> > 
> > It's not clear to me what you need the drm_edid header, you just return
> > a drm_display_mode pointer so you can just forward declare the structure
> 
> 
> There is a compile error without the header，because there is no
> "drm_display_mode_from_cea_vic()" declare.
> 
> drivers/gpu/drm/tests/drm_kunit_helpers.c:341:16: error: implicit
> declaration of function ‘drm_display_mode_from_cea_vic’; did you mean
> ‘drm_kunit_display_mode_from_cea_vic’?
> [-Werror=implicit-function-declaration]
>   341 |         mode = drm_display_mode_from_cea_vic(dev, video_code);
>       |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>       |                drm_kunit_display_mode_from_cea_vic
> drivers/gpu/drm/tests/drm_kunit_helpers.c:341:14: warning: assignment to
> ‘struct drm_display_mode *’ from ‘int’ makes pointer from integer
> without a cast [-Wint-conversion]
>   341 |         mode = drm_display_mode_from_cea_vic(dev, video_code);
>       |              ^

Right, but the error is in the C file, not the header.

Maxime

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