linux-kernel - Re: [PATCH] spi: omap2-mcspi: In case of dma errors fall back to pio

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Message-ID: <20120807120227.GA11011@atomide.com>
Date:	Tue, 7 Aug 2012 05:02:27 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Shubhrajyoti <shubhrajyoti@...com>
Cc:	spi-devel-general@...ts.sourceforge.net,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: omap2-mcspi: In case of dma errors fall back to
 pio

* Shubhrajyoti <shubhrajyoti@...com> [120807 04:21]:
> On Tuesday 07 August 2012 01:17 PM, Tony Lindgren wrote:
> >>  };
> > Don't you need to check separately for rx and tx dma? There's a slight
> > chance that you get a channel for one but not for the other..
> In that case I treat it as non usable and fall back to pio.

OK that should work too.
 
> Are you suggesting that let one channel be dma and only the failed one pio?

I guess both are doable. For reduced CPU load using DMA where possible
of course is the best way to go.

Tony
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