linux-kernel - Re: [PATCH] SDMA: Fixing bug in omap_dma_set_global

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Date:	Fri, 2 Oct 2009 14:42:29 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Venkatraman S <svenkatr@...com>
Cc:	Anuj Aggarwal <anuj.aggarwal@...com>, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] SDMA: Fixing bug in omap_dma_set_global_params()

* Venkatraman S <svenkatr@...com> [090923 01:25]:
> On Wed, Sep 23, 2009 at 12:49 PM, Anuj Aggarwal <anuj.aggarwal@...com> wrote:
> > Argument tparams was not being used to program
> > global register GCR.HI_THREAD_RESERVED. This patch fixes the same.
> >
> > Signed-off-by: Anuj Aggarwal <anuj.aggarwal@...com>
> > ---
> >  arch/arm/plat-omap/dma.c |   13 +++++++------
> >  1 files changed, 7 insertions(+), 6 deletions(-)
> >
> > diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
> > index bf08634..7a7b6df 100644
> > --- a/arch/arm/plat-omap/dma.c
> > +++ b/arch/arm/plat-omap/dma.c
> > @@ -829,10 +829,10 @@ EXPORT_SYMBOL(omap_free_dma);
> >  *
> >  * @param arb_rate
> >  * @param max_fifo_depth
> > - * @param tparams - Number of thereads to reserve : DMA_THREAD_RESERVE_NORM
> > - *                                                 DMA_THREAD_RESERVE_ONET
> > - *                                                 DMA_THREAD_RESERVE_TWOT
> > - *                                                 DMA_THREAD_RESERVE_THREET
> > + * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
> > + *                                                DMA_THREAD_RESERVE_ONET
> > + *                                                DMA_THREAD_RESERVE_TWOT
> > + *                                                DMA_THREAD_RESERVE_THREET
> >  */
> >  void
> >  omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
> > @@ -847,8 +847,9 @@ omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
> >        if (arb_rate == 0)
> >                arb_rate = 1;
> >
> > -       reg = (arb_rate & 0xff) << 16;
> > -       reg |= (0xff & max_fifo_depth);
> > +       reg = 0xff & max_fifo_depth;
> > +       reg |= (0x3 & tparams) << 12;
> > +       reg |= (arb_rate & 0xff) << 16;
> >
> >        dma_write(reg, GCR);
> >  }
> 
> max_fifo_depth should not be set to zero. Perhaps it deserves a check
> similar to arb_rate ?

Any news on updating this patch to also check the max_fifo_depth?

Tony
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