linux-kernel - Re: [PATCH] drm/exynos: Fix build breakage on !DRM_EXYNOS

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Date:	Mon, 4 May 2015 12:34:51 +0100
From:	Daniel Stone <daniel@...ishbar.org>
To:	Inki Dae <inki.dae@...sung.com>
Cc:	Krzysztof Kozlowski <k.kozlowski.k@...il.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] drm/exynos: Fix build breakage on !DRM_EXYNOS_FIMD

Hi,

On 4 May 2015 at 08:43, Inki Dae <inki.dae@...sung.com> wrote:
> On 2015년 05월 02일 13:08, Krzysztof Kozlowski wrote:
>> Selecting CONFIG_FB_S3C disables CONFIG_DRM_EXYNOS_FIMD leading to build
>> error:
>
> No, eDP has no any dependency of FIMD but DECON. Just add dependency
> code like below,
>
>  config DRM_EXYNOS7_DECON
>         bool "Exynos DRM DECON"
> -       depends on DRM_EXYNOS
> +       depends on DRM_EXYNOS && !FB_S3C

But it does clearly and explicitly call fimd_dp_clock_enable from
exynos_dp_powero{n,ff}. So the dependency you're proposing seems
backwards: it's not an expression of the requirements of the current
code (that FIMD DP code be available, i.e. CONFIG_DRM_EXYNOS_FIMD is
selected), but an indirect expression of another dependency
(CONFIG_FB_S3C disables CONFIG_DRM_EXYNOS_FIMD, so disable
CONFIG_FB_S3C).

Additionally, as the call comes from exynos_dp_core.c, which is built
by CONFIG_DRM_EXYNOS_DP (an explicitly user-selectable option), why
shouldn't the dependency be there? Ah, because the dependency on DP is
for (DECON || FIMD), but as DECON doesn't provide
fimd_dp_clock_enable(), it doesn't seem like it would compile if you
selected DECON and not FIMD.

So, for me, the cleanest solution would be config DRM_EXYNOS_DP gains
a hard dependency on DRM_EXYNOS_FIMD, at least until it can be fixed
to compile without FIMD.

Cheers,
Daniel
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