Re: [PATCH v7 4/7] dmaengine: dw-edma: Reclaim LL entries from hardware progress

[sashiko-bot@kernel.org]

> With dynamic appends, a DONE interrupt no longer means that all
> published LL entries have completed. Prepare for this by using LLP to
> advance ll_done and complete descriptors in issue order.
> 
> Reclaim completed entries and refill the ring as space becomes
> available. Restart a stopped channel when published work remains. This
> also allows descriptors larger than the ring to run in batches.
> 
> Hardware can keep running while the driver handles an interrupt, and
> LLP does not always track payload completion. Use the following
> exclusive completion boundaries, where idx is the raw LLP entry index
> and prev(idx) is the previous data entry in the ring:
> 
>   State/event          Meaning of raw LLP               Boundary
>   -------------------  -------------------------------  ---------
> [ ... ]
>   without callbacks, as in the non-LL path.
> - On pause, stop publishing new entries and enter the paused state once
>   the channel stops. Keep unfinished work for resume.
> 
> Signed-off-by: Koichiro Den <den@valinux.co.jp>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261104161227.1742005-1-den@valinux.co.jp?part=4