linux-kernel - Re: [PATCH 4/7] dw_dmac: autoconfigure block

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Date:	Thu, 20 Sep 2012 12:38:00 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	viresh kumar <viresh.kumar@...aro.org>
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: [PATCH 4/7] dw_dmac: autoconfigure block_size or use platform
 data

On Tue, 2012-09-18 at 12:27 +0530, viresh kumar wrote:

[snip]

> > @@ -1420,6 +1411,9 @@ static int __devinit dw_probe(struct platform_device *pdev)
> >
> >         dw->regs = regs;
> >
> > +       /* get hardware configuration parameters */
> > +       max_blk_size = dma_readl(dw, MAX_BLK_SIZE);
> > +
> 
> Do this only for autocfg case.
Ok.

> > @@ -1465,6 +1459,14 @@ 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) {
> > +                       dwc->block_size =
> > +                               (4 << ((max_blk_size >> 4 * i) & 0xf)) - 1;
> 
> Put a comment on what are you doing here.
Ok.

> 
> > +               } else {
> > +                       dwc->block_size = pdata->block_size;
> > +               }
> 
> Don't need {} for single line statements.
Ok. By the way it comes by next patch anyway.

> > --- a/drivers/dma/dw_dmac_regs.h
> > +++ b/drivers/dma/dw_dmac_regs.h
> > @@ -186,6 +186,9 @@ struct dw_dma_chan {
> >
> >         unsigned int            descs_allocated;
> >
> > +       /* hardware configuration */
> > +       unsigned short          block_size;
> > +
> 
> You actually don't save any memory here with short and actually makes access
> to block_size more complex. keeping it int would be better i believe.
I rather agree with you. I'll change it.

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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