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Date:   Thu, 8 Apr 2021 13:44:22 +0200
From:   Arnd Bergmann <>
To:     David Hildenbrand <>
Cc:     Linux Kernel Mailing List <>,
        Linux-MM <>, Joel Stanley <>,
        David Airlie <>,
        Daniel Vetter <>,
        Andrew Jeffery <>,
        Lucas Stach <>,
        Russell King <>,
        Christian Gmeiner <>,
        Mike Rapoport <>,
        Bartlomiej Zolnierkiewicz <>,
        Linus Walleij <>,
        Michal Simek <>,
        Masahiro Yamada <>,
        Randy Dunlap <>,
        Peter Collingbourne <>,
        linux-aspeed <>,
        dri-devel <>,
        Linux ARM <>,
        The etnaviv authors <>,
        Linux Fbdev development list <>
Subject: Re: [PATCH v1 2/2] drivers/gpu/drm: don't select DMA_CMA or CMA from
 aspeed or etnaviv

On Thu, Apr 8, 2021 at 1:00 PM David Hildenbrand <> wrote:
> >
> > It is a somewhat awkward way to say "prevent this symbol from
> > being =y if the dependency is =m".
> What would be the right thing to do in the case here then to achieve the
> "if DRMA_ASPEED_GFX is enabled, also enable DMA_CMA id possible"?
> One approach could be to have for DMA_CMA
> default y if DRMA_ASPEED_GFX
> but it feels like the wrong way to tackle this.

I'm still not sure what you are trying to achieve. Is the idea only to provide
a useful default for DMA_CMA depending on which drivers are enabled?

This is something you could do using a hidden helper symbol like

       bool "Aspeed display driver"
       select DRM_WANT_CMA

          Select this from any driver that benefits from CMA being enabled

config DMA_CMA
       bool "Use CMA helpers for DRM"
       default DRM_WANT_CMA


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