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

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Date:	Wed, 23 Sep 2009 13:54:30 +0530
From:	Venkatraman S <svenkatr@...com>
To:	Anuj Aggarwal <anuj.aggarwal@...com>
Cc:	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] SDMA: Fixing bug in omap_dma_set_global_params()

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 ?
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