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    SubjectRe: "dma-coherent" property inheritance (arm vs arm64)
    On 09/15/2014 11:52 AM, Catalin Marinas wrote:
    > Hi Jon,
    >
    > On Sun, Sep 14, 2014 at 03:38:07AM +0100, Jon Masters wrote:
    >> commit 6ecba8eb51b7d23fda66388a5420be7d8688b186
    >> Author: Catalin Marinas <catalin.marinas@arm.com>
    >> Date: Fri Apr 25 15:31:45 2014 +0100
    >>
    >> arm64: Use bus notifiers to set per-device coherent DMA ops
    >>
    >> Thus at this point, on 32-bit systems, we have defined this function:
    >>
    >> set_arch_dma_coherent_ops
    >
    > It was a timing issue that they are not in sync. I would have used
    > set_arch_dma_coherent_ops() but it wasn't very clear when it gets merged
    > and changing the default on arm64 broke some other assumptions, so a
    > temporary fix.

    Ok. So arm64 will automatically switch over to set_arch_dma_coherent_ops
    (once it's there, it will be called automatically anyway because it's in
    the callchain anyway already).

    For the moment, on our internal PCI trees, we'll add a notifier and wait
    for upstream to get PCI support and figure this out as part of that
    activity. In the case of ACPI, I'm still pushing for _CCA methods to be
    added by default because it makes sense to be verbose in describing
    platform hardware devices, even in spite of default.

    Jon.



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