linux-kernel - Re: [PATCH V2] dmaengine: qcom_hidma: correct API violation for submit

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Message-ID: <20170703051022.GZ19154@localhost>
Date:   Mon, 3 Jul 2017 10:40:22 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Sinan Kaya <okaya@...eaurora.org>
Cc:     dmaengine@...r.kernel.org, timur@...eaurora.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] dmaengine: qcom_hidma: correct API violation for
 submit

On Fri, Jun 30, 2017 at 10:43:05AM -0400, Sinan Kaya wrote:
> Current code is violating the DMA Engine API by putting the submitted
> requests directly into the HW queue. This causes queued transactions
> to be started by another thread as soon as the first one finishes.
> 
> The DMA Engine document clearly states this.
> 
> "dmaengine_submit() will not start the DMA operation".
> 
> Move HW queuing of the requests into the issue_pending() routine
> to comply with API requirements also create a new queued state for
> temporarily holding the requests.
> 
> A descriptor goes through these transitions now.
> 
> free->prepared->queued->active->completed->free
> 
> as opposed to
> 
> free->prepared->active->completed->free

Applied, thanks

-- 
~Vinod