linux-kernel - Re: [PATCHv4 01/11] videobuf2: add cache management members

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Date:   Mon, 9 Mar 2020 08:17:02 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Hans Verkuil <hans.verkuil@...co.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Sakari Ailus <sakari.ailus@....fi>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Pawel Osciak <posciak@...omium.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 01/11] videobuf2: add cache management members

On 3/9/20 5:03 AM, Sergey Senozhatsky wrote:
> On (20/03/07 12:47), Hans Verkuil wrote:
>>
>> 1) attempting to use V4L2_FLAG_MEMORY_NON_CONSISTENT will clear the flag
>>    upon return (test with both reqbufs and create_bufs).
>> 2) attempting to use V4L2_BUF_FLAG_NO_CACHE_INVALIDATE or V4L2_BUF_FLAG_NO_CACHE_CLEAN
>>
> [..]
>>
>> All these tests can be done in testReqBufs().
> 
> MEMORY_NON_CONSISTENT is a queue property, we set it during queue setup.
> NO_CACHE_INVALIDATE/FLAG_NO_CACHE_CLEAN is a buffer property, we set it
> when we qbuf. I'm not sure if all of these can be done in testReqBufts().

testReqBufs can call qbuf, but not streamon. Since you don't need streaming
for this, testReqBufs should be fine.

Regards,

	Hans

> 
> 	-ss
>