linux-kernel - Re: [PATCH 3/3 v3] ASoC: OMAP: Enhance OMAP1510 DMA progress software counter

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Date:	Mon, 17 Aug 2009 12:26:05 +0300
From:	Jarkko Nikula <jhnikula@...il.com>
To:	Janusz Krzysztofik <jkrzyszt@....icnet.pl>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Peter Ujfalusi <peter.ujfalusi@...ia.com>,
	Tony Lindgren <tony@...mide.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.arm.linux.org.uk" 
	<linux-arm-kernel@...ts.arm.linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3 v3] ASoC: OMAP: Enhance OMAP1510 DMA progress
 software counter

On Tue, 11 Aug 2009 21:44:29 +0200
Janusz Krzysztofik <jkrzyszt@....icnet.pl> wrote:

> Enhance period_index accuracy, particularly just before buffer rewind, by
> making use of DMA interrupt status flags in addition to simply counting up
> interrupts.
> 
> Changes since v2:
> > > > -   }
> > > > +   } else if (stat == OMAP_DMA_LAST_IRQ)
> > > > +           return;
> > >
> > > Is this test needed? This interrupt is set only for playback on
> > > omap1510 so this looks null-op.
> >
> > You're right, I have put it here before limiting the flag request to
> > playback on OMAP1510 only. So it can be omitted...
> 
> > > > +           omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ |
> > > > +                                                   OMAP_DMA_LAST_IRQ);
> > >
> > > Indent OMAP_DMA_LAST_IRQ with tab(s) and spaces to the same column
> > > than OMAP_DMA_FRAME_IRQ. Looks nicer then.
> >
> > OK, will fix it.
> >
> > > Should the
> > > OMAP_DMA_BLOCK_IRQ to be set since it is handled in omap_pcm_dma_irq?
> >
> > This one is already requested from inside omap_request_dma() and used
> > inside omap1_dma_handle_ch() in addition to passing it to us.
> But for less confusion, it'll be better if requested from here too.
> 
I'm fine with this 3rd version. Probably Mark would like to have git
format-patch formatted version for avoiding manual commit log editing.

Acked-by: Jarkko Nikula <jhnikula@...il.com>
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