2015-05-04 20:34 GMT+09:00 Daniel Stone <daniel@xxxxxxxxxxxxx>:
> Hi,
>
> On 4 May 2015 at 08:43, Inki Dae <inki.dae@xxxxxxxxxxx> 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
Actually my commit message was not detailed enough. The FB_S3C here
won't solve the issue because you may:
1, disable FIMD and FB_S3C,
2, enabke DECON and DP,
and it won't compile.
Currently the FIMD must be enabled if DRM_EXYNOS_DP is enabled.
>
> 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.
Right, you correctly pointed current dependencies. Still it looks little
hacky because EXYNOS_DP may work with FIMD or DECON. It does not really
need FIMD. Using ifdefs in headers is not uncommon - many core
subsystems do this that way to provide stubs.
Probably the cleanest way would be to provide by FIMD and DECON a common
interface for DP for such operation, something like:
struct exynos_drm_crtc {
struct drm_crtc base;
...
void (*clock_enable)(struct exynos_drm_crtc *crtc, bool enable)
);
which, if non-NULL, will be called by exynos_dp_core.c:
static void exynos_dp_poweron(struct exynos_dp_device *dp)
{
...
if (crtc->clock_enable)
crtc->clock_enable(crtc, true);
}
What do you think?
Best regards,
Krzysztof
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/dri-devel
