linux-kernel - Re: [dmaengine] Cyclic DMA regression.

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Date:	Fri, 20 Apr 2012 15:32:19 +0530
From:	Vinod Koul <vinod.koul@...ux.intel.com>
To:	javier Martin <javier.martin@...ta-silicon.com>
Cc:	linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: [dmaengine] Cyclic DMA regression.

On Mon, 2012-04-09 at 09:09 +0200, javier Martin wrote:
> On 5 April 2012 08:08, Vinod Koul <vinod.koul@...ux.intel.com> wrote:
> > this is not right fix. The problem is that we shouldn't mark the cyclic
> > descriptor as complete. So for all drivers using cyclic API they should
> > do something like this. Can you test if this fixes your issue.
> > -----------------
> > diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
> > index a45b5d2..0c7362a 100644
> > --- a/drivers/dma/imx-dma.c
> > +++ b/drivers/dma/imx-dma.c
> > @@ -571,11 +571,14 @@ static void imxdma_tasklet(unsigned long data)
> >        if (desc->desc.callback)
> >                desc->desc.callback(desc->desc.callback_param);
> >
> > -       dma_cookie_complete(&desc->desc);
> > -
> > -       /* If we are dealing with a cyclic descriptor keep it on ld_active */
> > +       /* If we are dealing with a cyclic descriptor keep it on ld_active
> > +        * and don't mark the descriptor as complete.
> > +        * Only in non-cyclic cases it would be marked as complete
> > +        */
> >        if (imxdma_chan_is_doing_cyclic(imxdmac))
> >                goto out;
> > +       else
> > +               dma_cookie_complete(&desc->desc);
> >
> >        /* Free 2D slot if it was an interleaved transfer */
> >        if (imxdmac->enabled_2d) {
> >
> >
> > --
> > ~Vinod
> >
> 
> Hi Vinod,
> thank you for your patch.
> 
> It works fine for me:
> 
> Tested-by: Javier Martin <javier.martin@...ta-silicon.com>
> 
> Could you apply it in your tree as a fix for 3.4?
Thanks, Applied now


-- 
~Vinod

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