Re: [PATCH v14 0/3] Add drm driver for Rockchip Socs

[Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>]

On Thursday 27 November 2014 14:05:00 Daniel Kurtz wrote:
> On Thu, Nov 27, 2014 at 2:08 AM, Mark yao <mark.yao-TNX95d0MmH7DzftRWevZcw@public.gmane.org> wrote:
> >
> > On 2014年11月27日 10:12, Dave Airlie wrote:
> >>>>
> >>>>
> >>> Hi Dave
> >>>      Do you mean that I need send you a branch, based on drm-next, merge with
> >>> iommu tree and rockchip drm?
> >>
> >> Yes, grab drm-next, git pull the arm/rockchip branch from Joerg's
> >> tree, put rockchip drm
> >> patches on top, send me pull request.
> >>
> >> I'll validate it then.
> >>
> >> Dave.
> >>
> > Hi Dave
> >     I have send a pull request to you, with Joerg's iommu arm/rockchip branch.
> >
> >     I got a same problem when use "make multi_v7_defconfig" as Heiko said:
> >         drivers/video/fbdev/Kconfig:5:error: recursive dependency detected!
> >         drivers/video/fbdev/Kconfig:5:    symbol FB is selected by DRM_KMS_FB_HELPER
> >         drivers/gpu/drm/Kconfig:34:    symbol DRM_KMS_FB_HELPER is selected by DRM_ROCKCHIP
> >         drivers/gpu/drm/rockchip/Kconfig:1:    symbol DRM_ROCKCHIP depends on ARM_DMA_USE_IOMMU
> >         arch/arm/Kconfig:95:    symbol ARM_DMA_USE_IOMMU is selected by VIDEO_OMAP3
> >         drivers/media/platform/Kconfig:96:    symbol VIDEO_OMAP3 depends on VIDEO_V4L2
> >         drivers/media/v4l2-core/Kconfig:6:    symbol VIDEO_V4L2 depends on I2C
> >         drivers/i2c/Kconfig:7:    symbol I2C is selected by FB_DDC
> >         drivers/video/fbdev/Kconfig:59:    symbol FB_DDC is selected by FB_CYBER2000_DDC
> >         drivers/video/fbdev/Kconfig:374:    symbol FB_CYBER2000_DDC depends on FB_CYBER2000
> >         drivers/video/fbdev/Kconfig:362:    symbol FB_CYBER2000 depends on FB
> >
> >     I was confused how to solve the recursive dependency, remove depends on ARM_DMA_USE_IOMMU & IOMMU_API?
> 
> The "depends on ARM_DMA_USE_IOMMU & IOMMU_API" was suggested by Arnd
> Bergmann during code review (originally they were selected).
> 
> Removing them definitely fixes the dependency recursion.
> Also, since they are both already selected by ROCKCHIP_IOMMU,
> everything will build correctly.
> So, this sounds good to me, but I am no expert on Kconfig.
> 

I think the problem here is VIDEO_OMAP3 (among others), it should do the
same as rockchips and use 'depends on' instead of 'select'.

Another problem is the 'select I2C' in FB_DDC, but that would be much harder
to fix.

	Arnd