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SubjectRe: [PATCH v2] venus: vdec: Handle DRC after drain
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Hi Fritz,

On 12/1/20 6:23 AM, Fritz Koenig wrote:
> If the DRC is near the end of the stream the client
> may send a V4L2_DEC_CMD_STOP before the DRC occurs.
> V4L2_DEC_CMD_STOP puts the driver into the
> VENUS_DEC_STATE_DRAIN state. DRC must be aware so
> that after the DRC event the state can be restored
> correctly.
>
> Signed-off-by: Fritz Koenig <frkoenig@chromium.org>
> ---
>
> v2: remove TODO
>
> drivers/media/platform/qcom/venus/core.h | 1 +
> drivers/media/platform/qcom/venus/vdec.c | 17 +++++++++++++++--
> 2 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
> index 2b0899bf5b05f..1680c936c06fb 100644
> --- a/drivers/media/platform/qcom/venus/core.h
> +++ b/drivers/media/platform/qcom/venus/core.h
> @@ -406,6 +406,7 @@ struct venus_inst {
> unsigned int core_acquired: 1;
> unsigned int bit_depth;
> bool next_buf_last;
> + bool drain_active;

Could you introduce a new codec state instead of adding a flag for such
corner case.

I think that we will need to handle at least one more corner case (DRC
during seek operation), so then we have to introduce another flag, and
this is not a good solution to me. These additional flags will
complicate the state handling and will make the code readability worst

I'd introduce: VENUS_DEC_STATE_DRC_DURING_DRAIN or something similar.

> };
>
> #define IS_V1(core) ((core)->res->hfi_version == HFI_VERSION_1XX)
> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
> index 5671cf3458a68..1d551b4d651a8 100644
> --- a/drivers/media/platform/qcom/venus/vdec.c
> +++ b/drivers/media/platform/qcom/venus/vdec.c
> @@ -523,8 +523,10 @@ vdec_decoder_cmd(struct file *file, void *fh, struct v4l2_decoder_cmd *cmd)
>
> ret = hfi_session_process_buf(inst, &fdata);
>
> - if (!ret && inst->codec_state == VENUS_DEC_STATE_DECODING)
> + if (!ret && inst->codec_state == VENUS_DEC_STATE_DECODING) {
> inst->codec_state = VENUS_DEC_STATE_DRAIN;
> + inst->drain_active = true;
> + }
> }
>
> unlock:
> @@ -976,10 +978,14 @@ static int vdec_start_capture(struct venus_inst *inst)
>
> inst->codec_state = VENUS_DEC_STATE_DECODING;
>
> + if (inst->drain_active)
> + inst->codec_state = VENUS_DEC_STATE_DRAIN;
> +
> inst->streamon_cap = 1;
> inst->sequence_cap = 0;
> inst->reconfig = false;
> inst->next_buf_last = false;
> + inst->drain_active = false;
>
> return 0;
>
> @@ -1105,6 +1111,7 @@ static int vdec_stop_capture(struct venus_inst *inst)
> /* fallthrough */
> case VENUS_DEC_STATE_DRAIN:
> inst->codec_state = VENUS_DEC_STATE_STOPPED;
> + inst->drain_active = false;
> /* fallthrough */
> case VENUS_DEC_STATE_SEEK:
> vdec_cancel_dst_buffers(inst);
> @@ -1304,8 +1311,10 @@ static void vdec_buf_done(struct venus_inst *inst, unsigned int buf_type,
>
> v4l2_event_queue_fh(&inst->fh, &ev);
>
> - if (inst->codec_state == VENUS_DEC_STATE_DRAIN)
> + if (inst->codec_state == VENUS_DEC_STATE_DRAIN) {
> + inst->drain_active = false;
> inst->codec_state = VENUS_DEC_STATE_STOPPED;
> + }
> }
>
> if (!bytesused)
> @@ -1429,9 +1438,13 @@ static void vdec_event_notify(struct venus_inst *inst, u32 event,
> case EVT_SYS_EVENT_CHANGE:
> switch (data->event_type) {
> case HFI_EVENT_DATA_SEQUENCE_CHANGED_SUFFICIENT_BUF_RESOURCES:
> + if (inst->codec_state == VENUS_DEC_STATE_DRAIN)
> + inst->codec_state = VENUS_DEC_STATE_DECODING;

Could you move this state transition into vdec_event_change(). That way
we will do it only once.

> vdec_event_change(inst, data, true);
> break;
> case HFI_EVENT_DATA_SEQUENCE_CHANGED_INSUFFICIENT_BUF_RESOURCES:
> + if (inst->codec_state == VENUS_DEC_STATE_DRAIN)
> + inst->codec_state = VENUS_DEC_STATE_DECODING;

ditto

> vdec_event_change(inst, data, false);
> break;
> case HFI_EVENT_RELEASE_BUFFER_REFERENCE:
>

--
regards,
Stan

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