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Date: Fri, 13 Oct 2017 16:53:41 -0400
From: Nicolas Dufresne <nicolas@...fresne.ca>
To: Stanimir Varbanov <stanimir.varbanov@...aro.org>,
Hans Verkuil <hverkuil@...all.nl>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] venus: reimplement decoder stop command
Thanks, is the encoder stop command going to be implemented too ?
Le vendredi 13 octobre 2017 à 17:13 +0300, Stanimir Varbanov a écrit :
> This addresses the wrong behavior of decoder stop command by
> rewriting it. These new implementation enqueue an empty buffer
> on the decoder input buffer queue to signal end-of-stream. The
> client should stop queuing buffers on the V4L2 Output queue
> and continue queuing/dequeuing buffers on Capture queue. This
> process will continue until the client receives a buffer with
> V4L2_BUF_FLAG_LAST flag raised, which means that this is last
> decoded buffer with data.
>
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
Tested-By: Nicolas Dufresne <nicolas.dufresne@...labora.com>
> ---
> drivers/media/platform/qcom/venus/core.h | 2 --
> drivers/media/platform/qcom/venus/helpers.c | 7 ------
> drivers/media/platform/qcom/venus/hfi.c | 1 +
> drivers/media/platform/qcom/venus/vdec.c | 34
> +++++++++++++++++++----------
> 4 files changed, 24 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/core.h
> b/drivers/media/platform/qcom/venus/core.h
> index cba092bcb76d..a0fe80df0cbd 100644
> --- a/drivers/media/platform/qcom/venus/core.h
> +++ b/drivers/media/platform/qcom/venus/core.h
> @@ -194,7 +194,6 @@ struct venus_buffer {
> * @fh: a holder of v4l file handle structure
> * @streamon_cap: stream on flag for capture queue
> * @streamon_out: stream on flag for output queue
> - * @cmd_stop: a flag to signal encoder/decoder commands
> * @width: current capture width
> * @height: current capture height
> * @out_width: current output width
> @@ -258,7 +257,6 @@ struct venus_inst {
> } controls;
> struct v4l2_fh fh;
> unsigned int streamon_cap, streamon_out;
> - bool cmd_stop;
> u32 width;
> u32 height;
> u32 out_width;
> diff --git a/drivers/media/platform/qcom/venus/helpers.c
> b/drivers/media/platform/qcom/venus/helpers.c
> index cac429be5609..6a85dd10ecd4 100644
> --- a/drivers/media/platform/qcom/venus/helpers.c
> +++ b/drivers/media/platform/qcom/venus/helpers.c
> @@ -626,13 +626,6 @@ void venus_helper_vb2_buf_queue(struct
> vb2_buffer *vb)
>
> mutex_lock(&inst->lock);
>
> - if (inst->cmd_stop) {
> - vbuf->flags |= V4L2_BUF_FLAG_LAST;
> - v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_DONE);
> - inst->cmd_stop = false;
> - goto unlock;
> - }
> -
> v4l2_m2m_buf_queue(m2m_ctx, vbuf);
>
> if (!(inst->streamon_out & inst->streamon_cap))
> diff --git a/drivers/media/platform/qcom/venus/hfi.c
> b/drivers/media/platform/qcom/venus/hfi.c
> index c09490876516..ba29fd4d4984 100644
> --- a/drivers/media/platform/qcom/venus/hfi.c
> +++ b/drivers/media/platform/qcom/venus/hfi.c
> @@ -484,6 +484,7 @@ int hfi_session_process_buf(struct venus_inst
> *inst, struct hfi_frame_data *fd)
>
> return -EINVAL;
> }
> +EXPORT_SYMBOL_GPL(hfi_session_process_buf);
>
> irqreturn_t hfi_isr_thread(int irq, void *dev_id)
> {
> diff --git a/drivers/media/platform/qcom/venus/vdec.c
> b/drivers/media/platform/qcom/venus/vdec.c
> index da611a5eb670..c9e9576bb08a 100644
> --- a/drivers/media/platform/qcom/venus/vdec.c
> +++ b/drivers/media/platform/qcom/venus/vdec.c
> @@ -469,8 +469,14 @@ static int vdec_subscribe_event(struct v4l2_fh
> *fh,
> static int
> vdec_try_decoder_cmd(struct file *file, void *fh, struct
> v4l2_decoder_cmd *cmd)
> {
> - if (cmd->cmd != V4L2_DEC_CMD_STOP)
> + switch (cmd->cmd) {
> + case V4L2_DEC_CMD_STOP:
> + if (cmd->flags & V4L2_DEC_CMD_STOP_TO_BLACK)
> + return -EINVAL;
> + break;
> + default:
> return -EINVAL;
> + }
>
> return 0;
> }
> @@ -479,6 +485,7 @@ static int
> vdec_decoder_cmd(struct file *file, void *fh, struct
> v4l2_decoder_cmd *cmd)
> {
> struct venus_inst *inst = to_inst(file);
> + struct hfi_frame_data fdata = {0};
> int ret;
>
> ret = vdec_try_decoder_cmd(file, fh, cmd);
> @@ -486,12 +493,23 @@ vdec_decoder_cmd(struct file *file, void *fh,
> struct v4l2_decoder_cmd *cmd)
> return ret;
>
> mutex_lock(&inst->lock);
> - inst->cmd_stop = true;
> - mutex_unlock(&inst->lock);
>
> - hfi_session_flush(inst);
> + /*
> + * Implement V4L2_DEC_CMD_STOP by enqueue an empty buffer on
> decoder
> + * input to signal EOS.
> + */
> + if (!(inst->streamon_out & inst->streamon_cap))
> + goto unlock;
> +
> + fdata.buffer_type = HFI_BUFFER_INPUT;
> + fdata.flags |= HFI_BUFFERFLAG_EOS;
> + fdata.device_addr = 0xdeadbeef;
>
> - return 0;
> + ret = hfi_session_process_buf(inst, &fdata);
> +
> +unlock:
> + mutex_unlock(&inst->lock);
> + return ret;
> }
>
> static const struct v4l2_ioctl_ops vdec_ioctl_ops = {
> @@ -718,7 +736,6 @@ static int vdec_start_streaming(struct vb2_queue
> *q, unsigned int count)
> inst->reconfig = false;
> inst->sequence_cap = 0;
> inst->sequence_out = 0;
> - inst->cmd_stop = false;
>
> ret = vdec_init_session(inst);
> if (ret)
> @@ -807,11 +824,6 @@ static void vdec_buf_done(struct venus_inst
> *inst, unsigned int buf_type,
> vb->timestamp = timestamp_us * NSEC_PER_USEC;
> vbuf->sequence = inst->sequence_cap++;
>
> - if (inst->cmd_stop) {
> - vbuf->flags |= V4L2_BUF_FLAG_LAST;
> - inst->cmd_stop = false;
> - }
> -
> if (vbuf->flags & V4L2_BUF_FLAG_LAST) {
> const struct v4l2_event ev = { .type =
> V4L2_EVENT_EOS };
>
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