linux-kernel - Re: [PATCH 00/28] Venus updates

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Message-ID: <431ff7a2-cef0-59e4-4540-4ed8e8180e55@linaro.org>
Date:   Tue, 8 May 2018 02:26:55 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Hans Verkuil <hverkuil@...all.nl>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Vikash Garodia <vgarodia@...eaurora.org>
Subject: Re: [PATCH 00/28] Venus updates

Hi Hans,

On  7.05.2018 13:41, Hans Verkuil wrote:
> On 24/04/18 14:44, Stanimir Varbanov wrote:
>> Hello,
>>
>> This patch set aims to:
>>
>> * add initial support for Venus version 4xx (found on sdm845).
>>
>> * introduce a common capability parser to enumerate better
>>    supported uncompressed formats, capabilities by codec,
>>    supported codecs and so on.
>>
>> * also contains various cleanups, readability improvements
>>    and fixes.
>>
>> * adds HEVC codec support for the Venus versions which has
>>    support for it.
>>
>> * add multi-stream support (secondary decoder output), which
>>    will give as an opportunity to use UBWC compressed formats
>>    to optimize internal interconnect bandwidth on higher
>>    resolutions.
> 
> I'm a bit confused about this: is this a purely driver-internal thing,
> or is this exposed somehow to userspace as well? It seems to be purely
> internal.

For now it'll be internal for the driver. In downstream driver it is 
exposed to userspace via custom v4l_control but that is not generic and 
I decided to not expose it.

regards,
Stan