Date:   Tue, 01 Dec 2020 17:52:04 +0530
From:   dikshita@...eaurora.org
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vikash Garodia <vgarodia@...eaurora.org>,
        Mansur Alisha Shaik <mansur@...eaurora.org>
Subject: Re: [PATCH 1/3] venus: venc: Init the session only once in
 queue_setup

Hi Stan,

On 2020-11-20 05:40, Stanimir Varbanov wrote:
> Init the hfi session only once in queue_setup and also cover that
> with inst->lock.
> 
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> ---
>  drivers/media/platform/qcom/venus/venc.c | 98 ++++++++++++++++++------
>  1 file changed, 73 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/venc.c
> b/drivers/media/platform/qcom/venus/venc.c
> index 4ecf78e30b59..3a2e449663d8 100644
> --- a/drivers/media/platform/qcom/venus/venc.c
> +++ b/drivers/media/platform/qcom/venus/venc.c
> @@ -725,8 +725,10 @@ static int venc_init_session(struct venus_inst 
> *inst)
>  	int ret;
> 
>  	ret = hfi_session_init(inst, inst->fmt_cap->pixfmt);
> -	if (ret)
> -		return ret;
> +	if (ret == -EINVAL)
> +		return 0;
> +	else if (ret)
> +		goto deinit;
> 
>  	ret = venus_helper_set_input_resolution(inst, inst->width,
>  						inst->height);
> @@ -762,17 +764,13 @@ static int venc_out_num_buffers(struct
> venus_inst *inst, unsigned int *num)
>  	struct hfi_buffer_requirements bufreq;
>  	int ret;
> 
> -	ret = venc_init_session(inst);
> +	ret = venus_helper_get_bufreq(inst, HFI_BUFFER_INPUT, &bufreq);
>  	if (ret)
>  		return ret;
> 
> -	ret = venus_helper_get_bufreq(inst, HFI_BUFFER_INPUT, &bufreq);
> -
>  	*num = bufreq.count_actual;
> 
> -	hfi_session_deinit(inst);
> -
> -	return ret;
> +	return 0;
>  }
> 
>  static int venc_queue_setup(struct vb2_queue *q,
> @@ -781,7 +779,7 @@ static int venc_queue_setup(struct vb2_queue *q,
>  {
>  	struct venus_inst *inst = vb2_get_drv_priv(q);
>  	unsigned int num, min = 4;
> -	int ret = 0;
> +	int ret;
> 
>  	if (*num_planes) {
>  		if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE &&
> @@ -803,6 +801,17 @@ static int venc_queue_setup(struct vb2_queue *q,
>  		return 0;
>  	}
> 
> +	ret = mutex_lock_interruptible(&inst->lock);
> +	if (ret)
> +		return ret;
> +
> +	ret = venc_init_session(inst);
> +
> +	mutex_unlock(&inst->lock);
> +
> +	if (ret)
> +		return ret;
> +
>  	switch (q->type) {
>  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
>  		*num_planes = inst->fmt_out->num_planes;
> @@ -838,6 +847,54 @@ static int venc_queue_setup(struct vb2_queue *q,
>  	return ret;
>  }
> 
> +static int venc_buf_init(struct vb2_buffer *vb)
> +{
> +	struct venus_inst *inst = vb2_get_drv_priv(vb->vb2_queue);
> +
> +	inst->buf_count++;
> +
> +	return venus_helper_vb2_buf_init(vb);
> +}
> +
> +static void venc_release_session(struct venus_inst *inst)
> +{
> +	int ret, abort = 0;
> +
> +	mutex_lock(&inst->lock);
> +
> +	ret = hfi_session_deinit(inst);
> +	abort = (ret && ret != -EINVAL) ? 1 : 0;
> +
> +	if (inst->session_error)
> +		abort = 1;
> +
> +	if (abort)
> +		hfi_session_abort(inst);
> +
> +	mutex_unlock(&inst->lock);
> +
> +	venus_pm_load_scale(inst);
> +	INIT_LIST_HEAD(&inst->registeredbufs);
> +	venus_pm_release_core(inst);
> +}
> +
> +static void venc_buf_cleanup(struct vb2_buffer *vb)
> +{
> +	struct venus_inst *inst = vb2_get_drv_priv(vb->vb2_queue);
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	struct venus_buffer *buf = to_venus_buffer(vbuf);
> +
> +	mutex_lock(&inst->lock);
> +	if (vb->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +		if (!list_empty(&inst->registeredbufs))
> +			list_del_init(&buf->reg_list);
> +	mutex_unlock(&inst->lock);
> +
> +	inst->buf_count--;
> +	if (!inst->buf_count)
> +		venc_release_session(inst);
> +}
> +
>  static int venc_verify_conf(struct venus_inst *inst)
>  {
>  	enum hfi_version ver = inst->core->res->hfi_version;
> @@ -888,38 +945,28 @@ static int venc_start_streaming(struct vb2_queue
> *q, unsigned int count)
>  	inst->sequence_cap = 0;
>  	inst->sequence_out = 0;
> 
> -	ret = venc_init_session(inst);
> -	if (ret)
> -		goto bufs_done;
> -
>  	ret = venus_pm_acquire_core(inst);
>  	if (ret)
> -		goto deinit_sess;
> -
> -	ret = venc_set_properties(inst);
> -	if (ret)
> -		goto deinit_sess;

With this change, if set ctrl for target bitrate is called after queue 
setup and before streaming,
the new bitrate won’t be set to FW. which is not right and can cause 
quality issues.
The same might apply to other encoder parameters as well.
Please fix this in the next version.

> +		goto error;
> 
>  	ret = venc_verify_conf(inst);
>  	if (ret)
> -		goto deinit_sess;
> +		goto error;
> 
>  	ret = venus_helper_set_num_bufs(inst, inst->num_input_bufs,
>  					inst->num_output_bufs, 0);
>  	if (ret)
> -		goto deinit_sess;
> +		goto error;
> 
>  	ret = venus_helper_vb2_start_streaming(inst);
>  	if (ret)
> -		goto deinit_sess;
> +		goto error;
> 
>  	mutex_unlock(&inst->lock);
> 
>  	return 0;
> 
> -deinit_sess:
> -	hfi_session_deinit(inst);
> -bufs_done:
> +error:
>  	venus_helper_buffers_done(inst, q->type, VB2_BUF_STATE_QUEUED);
>  	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
>  		inst->streamon_out = 0;
> @@ -940,7 +987,8 @@ static void venc_vb2_buf_queue(struct vb2_buffer 
> *vb)
> 
>  static const struct vb2_ops venc_vb2_ops = {
>  	.queue_setup = venc_queue_setup,
> -	.buf_init = venus_helper_vb2_buf_init,
> +	.buf_init = venc_buf_init,
> +	.buf_cleanup = venc_buf_cleanup,
>  	.buf_prepare = venus_helper_vb2_buf_prepare,
>  	.start_streaming = venc_start_streaming,
>  	.stop_streaming = venus_helper_vb2_stop_streaming,

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