[PATCH v3 0/3] drm,fbdev: Fix module dependencies

[Arnd Bergmann]

On Mon, Dec 16, 2024, at 08:42, Thomas Zimmermann wrote:
> Fix the dependencies among the various graphics modules.
>
> Before addressing the FB_CORE issue, patch 1 first resolves a problem
> with BACKLIGHT_CLASS_DEVICE. A number of fbdev drivers select it, which
> results in a recursive-dependency error after patch has been applied.
> Making these drivers (or parts of them) depend on BACKLIGHT_CLASS_DEVICE
> fixes this.
>
> Patch 2 selects FB_CORE for DRM_GEM_DMA_HELPER and DRM_TTM_HELPER.
> This is necessary with the recently added DRM client library.
>
> Patch 3 is the second half of the patch provided by Arnd at [1]. It
> could not yet be merged because of the issues fixed by patch 1.
>
> Side note: For the majority of graphics drivers, backlight functionality
> depends on BACKLIGHT_CLASS_DEVICE. In a few cases drivers select the
> Kconfig token automatically. These drivers should be updated to depend
> on the token as well, such that backlight functionality is fully user-
> controlled.
>
> v3:
> - Fix PMAC_BACKLIGHT case (Christophe)
> v2:

The patches look good to me. I've had a slightly different version
in my randconfig test tree and have replaced it with yours now
to do some more regression testing, but I expect this to be fine.

Reviewed-by: Arnd Bergmann <arnd at arndb.de>