linux-kernel - Re: [PATCHv2 4/6] dw_dmac: autoconfigure block

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Date:	Fri, 21 Sep 2012 19:30:48 +0530
From:	viresh kumar <viresh.kumar@...aro.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Vinod Koul <vinod.koul@...el.com>, spear-devel@...t.st.com,
	linux-kernel@...r.kernel.org, Hein Tibosch <hein_tibosch@...oo.es>
Subject: Re: [PATCHv2 4/6] dw_dmac: autoconfigure block_size or use platform data

On Fri, Sep 21, 2012 at 5:35 PM, Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
> diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
> @@ -1385,6 +1375,7 @@ static int __devinit dw_probe(struct platform_device *pdev)

> +       /* get hardware configuration parameters */
> +       if (autocfg)
> +               max_blk_size = dma_readl(dw, MAX_BLK_SIZE);
> +

Why don't you do above with the below ++ code

>         /* Calculate all channel mask before DMA setup */
>         dw->all_chan_mask = (1 << nr_channels) - 1;
>
> @@ -1470,6 +1465,16 @@ static int __devinit dw_probe(struct platform_device *pdev)
>                 INIT_LIST_HEAD(&dwc->free_list);
>
>                 channel_clear_bit(dw, CH_EN, dwc->mask);
> +
> +               /* hardware configuration */
> +               if (autocfg)
> +                       /* Decode maximum block size for given channel. The
> +                        * stored 4 bit value represents blocks from 0x00 for 3
> +                        * up to 0x0a for 4095. */

i.e. here?

> +                       dwc->block_size =
> +                               (4 << ((max_blk_size >> 4 * i) & 0xf)) - 1;
> +               else
> +                       dwc->block_size = pdata->block_size;
>         }
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