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Date: Thu, 8 Apr 2021 13:44:22 +0200 From: Arnd Bergmann <arnd@...db.de> To: David Hildenbrand <david@...hat.com> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>, Joel Stanley <joel@....id.au>, David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>, Andrew Jeffery <andrew@...id.au>, Lucas Stach <l.stach@...gutronix.de>, Russell King <linux+etnaviv@...linux.org.uk>, Christian Gmeiner <christian.gmeiner@...il.com>, Mike Rapoport <rppt@...nel.org>, Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>, Linus Walleij <linus.walleij@...aro.org>, Michal Simek <michal.simek@...inx.com>, Masahiro Yamada <masahiroy@...nel.org>, Randy Dunlap <rdunlap@...radead.org>, Peter Collingbourne <pcc@...gle.com>, linux-aspeed <linux-aspeed@...ts.ozlabs.org>, dri-devel <dri-devel@...ts.freedesktop.org>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, The etnaviv authors <etnaviv@...ts.freedesktop.org>, Linux Fbdev development list <linux-fbdev@...r.kernel.org> 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 <david@...hat.com> 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 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
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