Re: [PATCH v6 4/5] videobuf2-dc: Let drivers specify DMA attrs

[Doug Anderson]

On Mon, Feb 1, 2016 at 5:29 AM, Marek Szyprowski
<m.szyprowski@xxxxxxxxxxx> wrote:
> Hello,
>
> On 2016-01-11 18:30, Douglas Anderson wrote:
>>
>> From: Tomasz Figa <tfiga@xxxxxxxxxxxx>
>>
>> DMA allocations might be subject to certain reqiurements specific to the
>> hardware using the buffers, such as availability of kernel mapping (for
>> contents fix-ups in the driver). The only entity that knows them is the
>> driver, so it must share this knowledge with vb2-dc.
>>
>> This patch extends the alloc_ctx initialization interface to let the
>> driver specify DMA attrs, which are then stored inside the allocation
>> context and will be used for all allocations with that context.
>>
>> As a side effect, all dma_*_coherent() calls are turned into
>> dma_*_attrs() calls, because the attributes need to be carried over
>> through all DMA operations.
>>
>> Signed-off-by: Tomasz Figa <tfiga@xxxxxxxxxxxx>
>> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
>
>
> Acked-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>

Added both your ans Mauro's acks to the current patch in RMK's patch
tracker.  You can see the patch at
<http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=8508/2>

Note that Javier has tested this series upstream on a Samsung
Chromebook and validated that the allocations are working as intended,
even if MFC is a bit tricky to get working properly upstream.


-Doug