linux-kernel - Re: [PATCH] [RESEND] gpu: ipu-v3: add DRM dependency

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Date:   Tue, 25 Jul 2017 13:52:57 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Stephen Boyd <stephen.boyd@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [RESEND] gpu: ipu-v3: add DRM dependency

On Tue, 2017-07-25 at 13:35 +0200, Arnd Bergmann wrote:
> On Tue, Jul 25, 2017 at 10:03 AM, Philipp Zabel <p.zabel@...gutronix.de> wrote:
> > On Tue, 2017-07-25 at 09:33 +0200, Arnd Bergmann wrote:
> >> On Mon, Jul 24, 2017 at 10:05 AM, Philipp Zabel <p.zabel@...gutronix.de> wrote:
> >> > On Fri, 2017-07-21 at 22:56 +0200, Arnd Bergmann wrote:
> 
> >> If you only need build-testing, you could have a simple wrapper like
> >>
> >> const struct drm_format_info *ipu_format_info(u32 format)
> >> {
> >>          static const struct drm_format_info invalid = {};
> >>
> >>          if (!IS_REACHABLE(CONFIG_DRM))
> >>                   return &invalid;
> >>
> >>          return drm_format_info(format);
> >> }
> >
> > That should work fine. Both ipu_prg_format_supported and
> > ipu_prg_channel_configure are only ever called by DRM code.
> 
> Ok, in that case, I think we should just make the compilation
> of PRE and PRG conditional and leave them out when DRM
> is not built-in (be aware of the case of DRM=m, IPU=y).

Maybe we should just:

config IMX_IPUV3_CORE
	depends on DRM || !DRM # if DRM=m, this can't be 'y'

regards
Philipp