linux-kernel - Re: [PATCH] media: venus: queue initial buffers

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Date:   Sat, 20 Oct 2018 13:20:40 +0530
From:   mgottam@...eaurora.org
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>
Cc:     hverkuil@...all.nl, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, acourbot@...omium.org,
        vgarodia@...eaurora.org
Subject: Re: [PATCH] media: venus: queue initial buffers

On 2018-10-09 20:47, Stanimir Varbanov wrote:
> Hi Malathi,
> 
> On 10/09/2018 10:50 AM, Malathi Gottam wrote:
>> Buffers can be queued to driver before the planes are
>> set to start streaming. Queue those buffers to firmware
>> once start streaming is called on both the planes.
> 
> yes and this is done in venus_helper_m2m_device_run mem2mem operation
> when streamon on both queues is called, thus below function just
> duplicates .device_run.
> 
> Do you fix an issue with that patch?
> 
>> 
>> Signed-off-by: Malathi Gottam <mgottam@...eaurora.org>
>> ---
>>  drivers/media/platform/qcom/venus/helpers.c | 22 
>> ++++++++++++++++++++++
>>  drivers/media/platform/qcom/venus/helpers.h |  1 +
>>  drivers/media/platform/qcom/venus/venc.c    |  5 +++++
>>  3 files changed, 28 insertions(+)
>> 
>> diff --git a/drivers/media/platform/qcom/venus/helpers.c 
>> b/drivers/media/platform/qcom/venus/helpers.c
>> index e436385..2679adb 100644
>> --- a/drivers/media/platform/qcom/venus/helpers.c
>> +++ b/drivers/media/platform/qcom/venus/helpers.c
>> @@ -1041,6 +1041,28 @@ void venus_helper_vb2_stop_streaming(struct 
>> vb2_queue *q)
>>  }
>>  EXPORT_SYMBOL_GPL(venus_helper_vb2_stop_streaming);
>> 
>> +int venus_helper_queue_initial_bufs(struct venus_inst *inst)
>> +{
>> +	struct v4l2_m2m_ctx *m2m_ctx = inst->m2m_ctx;
>> +	struct v4l2_m2m_buffer *buf, *n;
>> +	int ret;
>> +
>> +	v4l2_m2m_for_each_dst_buf_safe(m2m_ctx, buf, n)	{
>> +		ret = session_process_buf(inst, &buf->vb);
>> +		if (ret)
>> +			return_buf_error(inst, &buf->vb);
>> +	}
>> +
>> +	v4l2_m2m_for_each_src_buf_safe(m2m_ctx, buf, n) {
>> +		ret = session_process_buf(inst, &buf->vb);
>> +		if (ret)
>> +			return_buf_error(inst, &buf->vb);
>> +	}
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL(venus_helper_queue_initial_bufs);
>> +
>>  int venus_helper_vb2_start_streaming(struct venus_inst *inst)
>>  {
>>  	struct venus_core *core = inst->core;
>> diff --git a/drivers/media/platform/qcom/venus/helpers.h 
>> b/drivers/media/platform/qcom/venus/helpers.h
>> index 2475f284..f4d76ab 100644
>> --- a/drivers/media/platform/qcom/venus/helpers.h
>> +++ b/drivers/media/platform/qcom/venus/helpers.h
>> @@ -31,6 +31,7 @@ void venus_helper_buffers_done(struct venus_inst 
>> *inst,
>>  int venus_helper_vb2_start_streaming(struct venus_inst *inst);
>>  void venus_helper_m2m_device_run(void *priv);
>>  void venus_helper_m2m_job_abort(void *priv);
>> +int venus_helper_queue_initial_bufs(struct venus_inst *inst);
>>  int venus_helper_get_bufreq(struct venus_inst *inst, u32 type,
>>  			    struct hfi_buffer_requirements *req);
>>  u32 venus_helper_get_framesz_raw(u32 hfi_fmt, u32 width, u32 height);
>> diff --git a/drivers/media/platform/qcom/venus/venc.c 
>> b/drivers/media/platform/qcom/venus/venc.c
>> index ce85962..ef11495 100644
>> --- a/drivers/media/platform/qcom/venus/venc.c
>> +++ b/drivers/media/platform/qcom/venus/venc.c
>> @@ -989,6 +989,11 @@ static int venc_start_streaming(struct vb2_queue 
>> *q, unsigned int count)
>>  	if (ret)
>>  		goto deinit_sess;
>> 
>> +	ret = venus_helper_queue_initial_bufs(inst);
>> +	if (ret)
>> +		goto deinit_sess;
>> +	}
>> +
>>  	mutex_unlock(&inst->lock);
>> 
>>  	return 0;
>> 
Hi Stan,

As I considered playback sequence as well, this function 
"venus_helper_m2m_device_run" was muted as a part of it. So I had to 
explicitly implement this function for encoder.

For now, we can omit this patch. Once the playback sequence gets merged 
into upstream, we can re-look into this.