[PATCH v2 3/4] [NOT FOR REVIEW] videobuf2-dc: Let drivers specify DMA attrs

[Doug Anderson]

Hi,

On Wed, Feb 17, 2016 at 2:42 AM, Jung Zhao <jung.zhao at rock-chips.com> wrote:
> From: Tomasz Figa <tfiga at chromium.org>
>
> 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 at chromium.org>
> Signed-off-by: Jung Zhao <jung.zhao at rock-chips.com>
> ---
> Changes in v2: None
>
>  drivers/media/v4l2-core/videobuf2-dma-contig.c | 33 +++++++++++++++++---------
>  include/media/videobuf2-dma-contig.h           | 11 ++++++++-
>  2 files changed, 32 insertions(+), 12 deletions(-)

This patch is already present in linuxnext.  I submitted it to Russell
King's Patch Tracking System a bit ago and got notice that it landed.
Checking linuxnext today I see:

ccc66e738252 ARM: 8508/2: videobuf2-dc: Let drivers specify DMA attrs

-Doug