[PATCH] ath10k: Enable IOMMU support for WCN3990 target

[Arnd Bergmann]

On Thu, Mar 1, 2018 at 2:18 PM, Govind Singh <govinds at qti.qualcomm.com> wrote:
>>> The asm/dma-iommu.h header file exsists only on arm32, no other architecture.
>>> I'm not sure about the purpose of the patch to start with:
>>> it's normally up to the platform code to allocate IOMMU domains, device drivers should only need to manually interact with the IOMMU layer if they need more than one domain, but this ath10k patch appears to be using the default domain and should have no effect as long as the platform code works correctly.
> Thanks Arnd, I have fixed this and migrated to  64bit API's(iommu_attach_device/iommu_detach_device/ iommu_get_domain_for_dev), will share the next revision.
> I tried using the default domain by adding the stream ID and mask in dt and no manual interaction, but it is resulting in TZ error and unhandled context fault.
> Seems I need to provide explicit mapping range(aperture_start/ aperture_end) as this is only working combination for me..

I don't see why you need to do that at all, can you clarify?

The IOMMU should be set up implicitly for you here based on the iommus
property in DT,
with no driver changes at all. This should work on all architectures/

       Arnd