linux-kernel - Re: [PATCH 26/28] venus: implementing multi-stream support

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Date:   Thu, 3 May 2018 10:12:38 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Vikash Garodia <vgarodia@...eaurora.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 26/28] venus: implementing multi-stream support

Hi Vikash,

Please write the comments for the chunk of code for which they are refer to.

On  2.05.2018 10:40, Vikash Garodia wrote:
> Hello Stanimir,
> 
> On 2018-04-24 18:14, Stanimir Varbanov wrote:
>> This is implementing a multi-stream decoder support. The multi
>> stream gives an option to use the secondary decoder output
>> with different raw format (or the same in case of crop).
>>
>> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
>> ---
>>  drivers/media/platform/qcom/venus/core.h    |   1 +
>>  drivers/media/platform/qcom/venus/helpers.c | 204 
>> +++++++++++++++++++++++++++-
>>  drivers/media/platform/qcom/venus/helpers.h |   6 +
>>  drivers/media/platform/qcom/venus/vdec.c    |  91 ++++++++++++-
>>  drivers/media/platform/qcom/venus/venc.c    |   1 +
>>  5 files changed, 299 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/media/platform/qcom/venus/core.h
>> b/drivers/media/platform/qcom/venus/core.h
>> index 4d6c05f156c4..85e66e2dd672 100644
>> --- a/drivers/media/platform/qcom/venus/core.h
>> +++ b/drivers/media/platform/qcom/venus/core.h
>> @@ -259,6 +259,7 @@ struct venus_inst {
>>      struct list_head list;
>>      struct mutex lock;
>>      struct venus_core *core;
>> +    struct list_head dpbbufs;
>>      struct list_head internalbufs;
>>      struct list_head registeredbufs;
>>      struct list_head delayed_process;

<snip>

> 
> The dpb buffers queued to hardware will be returned back to host either 
> during flush
> or when the session is stopped. Host should not send these buffers to 
> client.

That's correct.

> vdec_buf_done should be handling in a way to drop dpb buffers from 
> sending to client.

That is also correct, vdec_buf_done is trying to find the buffer by 
index from a list of queued buffers from v4l2 clients. See 
venus_helper_vb2_buf_queue where it is calling v4l2_m2m_buf_queue.

So for the dpb buffers venus_helper_find_buf() will return NULL.

regards,
Stan