Re: [PATCH v1 2/2] drivers/gpu/drm: don't select DMA_CMA or CMA from aspeed or etnaviv

[David Hildenbrand <david@redhat.com>]

On 08.04.21 15:19, Arnd Bergmann wrote:
> On Thu, Apr 8, 2021 at 2:50 PM Linus Walleij <linus.walleij@linaro.org> wrote:
>>
>> On Thu, Apr 8, 2021 at 2:01 PM David Hildenbrand <david@redhat.com> wrote:
>>
>>>> This is something you could do using a hidden helper symbol like
>>>>
>>>> config DRMA_ASPEED_GFX
>>>>          bool "Aspeed display driver"
>>>>          select DRM_WANT_CMA
>>>>
>>>> config DRM_WANT_CMA
>>>>          bool
>>>>          help
>>>>             Select this from any driver that benefits from CMA being enabled
>>>>
>>>> config DMA_CMA
>>>>          bool "Use CMA helpers for DRM"
>>>>          default DRM_WANT_CMA
>>>>
>>>>            Arnd
>>>>
>>>
>>> That's precisely what I had first, with an additional "WANT_CMA" --  but
>>> looking at the number of such existing options (I was able to spot 1 !)
>>
>> If you do this it probably makes sense to fix a few other drivers
>> Kconfig in the process. It's not just a problem with your driver.
>> "my" drivers:
>>
>> drivers/gpu/drm/mcde/Kconfig
>> drivers/gpu/drm/pl111/Kconfig
>> drivers/gpu/drm/tve200/Kconfig
>>
>> certainly needs this as well, and pretty much anything that is
>> selecting DRM_KMS_CMA_HELPER or
>> DRM_GEM_CMA_HELPER "wants" DMA_CMA.
> 
> Are there any that don't select either of the helpers and
> still want CMA? If not, it would be easy to just add
> 
>     default  DRM_KMS_CMA_HELPER || DRM_GEM_CMA_HELPER
> 
> and skipt the extra symbol.

That sounds like a reasonable thing to do. I'll look into that.

-- 
Thanks,

David / dhildenb