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

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Date:   Tue, 25 Jul 2017 13:35:16 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Philipp Zabel <p.zabel@...gutronix.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, 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).

        Arnd