Re: [PATCH v2 1/5] media: iris: Add dma sync calls for input and output buffers

[Dmitry Baryshkov]

On Tue, Aug 18, 2026 at 09:24:14PM +0530, Vishnu Reddy wrote:
> While testing with some higher resolution clips, the venus hardware
> triggers a fault due to wrong input data being received. Corruption
> was also observed in the captured output when the client dumped it
> to a file.
> 
> On debugging, found that DMA buffers shared between the CPU and the
> venus video hardware/controller are not in sync. CPU writes to an input
> buffer can remain in CPU cache without being visible to the video
> hardware when it reads the same buffer, so the hardware receives input
> data that does not match what the CPU wrote. Likewise, on the capture
> path, data written by the video hardware to the output buffer may not
> be visible to the CPU, so the client reads stale or partial data,
> resulting in corruption.
> 
> Add dma sync API calls to synchronize the data between the CPU cache
> and the venus hardware/controller.
> 
> Signed-off-by: Vishnu Reddy <busanna.reddy@xxxxxxxxxxxxxxxx>
> ---
>  drivers/media/platform/qcom/iris/iris_buffer.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 

Missing Fixes tag

-- 
With best wishes
Dmitry