linux-kernel - Re: [PATCH v2 27/34] media: iris: implement vb2 ops for buf

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Date: Wed, 20 Dec 2023 13:55:57 +0530
From: Dikshita Agarwal <quic_dikshita@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>, <linux-media@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <stanimir.k.varbanov@...il.com>,
        <quic_vgarodia@...cinc.com>, <agross@...nel.org>,
        <andersson@...nel.org>, <mchehab@...nel.org>,
        <bryan.odonoghue@...aro.org>
CC: <linux-arm-msm@...r.kernel.org>, <quic_abhinavk@...cinc.com>
Subject: Re: [PATCH v2 27/34] media: iris: implement vb2 ops for buf_queue and
 firmware response



On 12/19/2023 5:51 PM, Konrad Dybcio wrote:
> On 18.12.2023 12:32, Dikshita Agarwal wrote:
>> Implement vb2 ops for buf queue. Below are the different
>> buffer attributes:
>> BUF_ATTR_DEFERRED - buffer queued by client but not submitted
>> to firmware.
>> BUF_ATTR_READ_ONLY - processed buffer received from firmware
>> as read only. These buffers are held in firmware as reference
>> for future frame processing.
>> BUF_ATTR_PENDING_RELEASE - buffers requested to be released
>> from firmware.
>> BUF_ATTR_QUEUED - buffers submitted to firmware.
>> BUF_ATTR_DEQUEUED - buffers received from firmware.
>> BUF_ATTR_BUFFER_DONE - buffers sent back to vb2.
>>
>> Buffers are submitted and received via HFI_CMD_BUFFER.
>> Firmware associates below flags during buffer response:
>> HFI_BUF_FW_FLAG_RELEASE_DONE - buffer released in firmware.
>> HFI_BUF_FW_FLAG_READONLY - buffer used as reference in firmware.
>>
>> Input buffers dequeued from firmware are sent directly to vb2.
>>
>> Output buffers if read only, are sent to vb2 and also maintained
>> in read only list. If the same read only buffer is received form
>> client, HFI_BUF_HOST_FLAG_READONLY is attached to the buffer and
>> submitted to firmware. Once the buffer is received from firmware
>> as non read only, it is removed from read only list.
>>
>> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
>> ---
> [...]
> 
>>  
>> +enum iris_buffer_flags {
>> +	BUF_FLAG_KEYFRAME	= 0x00000008,
>> +	BUF_FLAG_PFRAME		= 0x00000010,
>> +	BUF_FLAG_BFRAME		= 0x00000020,
>> +	BUF_FLAG_ERROR		= 0x00000040,
> BIT(3), 4, 5, 6?
Sure, will update.
> 
> Konrad
>