[PATCH v4 0/2] Allow non-coherent video capture buffers on Rockchip ISP V1

[Mikhail Rudenko]

Hi, Jacopo!

On 2026-03-23 at 17:03 +01, Jacopo Mondi <jacopo.mondi at ideasonboard.com> wrote:

> Hello
>
> On Mon, Mar 03, 2025 at 02:40:08PM +0300, Mikhail Rudenko wrote:
>> This small series adds support for non-coherent video capture buffers
>> on Rockchip ISP V1. Patch 1 fixes cache management for dmabuf's
>> allocated by dma-contig allocator. Patch 2 allows non-coherent
>> allocations on the rkisp1 capture queue. Some timing measurements are
>> provided in the commit message of patch 2.
>>
>> Signed-off-by: Mikhail Rudenko <mike.rudenko at gmail.com>
>
> I regularly get back to this series everytime I have to reason about
> the caching policies in vb2..
>
> Is there any reason why it didn't get in ?

My impression is that all the review comments were addressed, but these
patches somehow fell through the cracks. I can rebase and post v5 if any
maintainer is interested in picking it up.

>> ---
>> Changes in v4:
>> - rebase to media/next
>> - use `direction` instead of `buf->dma_dir` in dma_sync_sgtable_*
>> - Link to v3: https://lore.kernel.org/r/20250128-b4-rkisp-noncoherent-v3-0-baf39c997d2a@gmail.com
>>
>> Changes in v3:
>> - ignore skip_cache_sync_* flags in vb2_dc_dmabuf_ops_{begin,end}_cpu_access
>> - invalidate/flush kernel mappings as appropriate if they exist
>> - use dma_sync_sgtable_* instead of dma_sync_sg_*
>> - Link to v2: https://lore.kernel.org/r/20250115-b4-rkisp-noncoherent-v2-0-0853e1a24012@gmail.com
>>
>> Changes in v2:
>> - Fix vb2_dc_dmabuf_ops_{begin,end}_cpu_access() for non-coherent buffers.
>> - Add cache management timing information to patch 2 commit message.
>> - Link to v1: https://lore.kernel.org/r/20250102-b4-rkisp-noncoherent-v1-1-bba164f7132c@gmail.com
>>
>> ---
>> Mikhail Rudenko (2):
>>       media: videobuf2: Fix dmabuf cache sync/flush in dma-contig
>>       media: rkisp1: Allow non-coherent video capture buffers
>>
>>  .../media/common/videobuf2/videobuf2-dma-contig.c  | 22 ++++++++++++++++++++++
>>  .../platform/rockchip/rkisp1/rkisp1-capture.c      |  1 +
>>  2 files changed, 23 insertions(+)
>> ---
>> base-commit: b2c4bf0c102084e77ed1b12090d77a76469a6814
>> change-id: 20241231-b4-rkisp-noncoherent-ad6e7c7a68ba
>>
>> Best regards,
>> --
>> Mikhail Rudenko <mike.rudenko at gmail.com>
>>
>>


--
Best regards,
Mikhail Rudenko