From: Tony Lindgren <tony@atomide.com>
To: "Pandita, Vikram" <vikram.pandita@ti.com>
Cc: "Shilimkar, Santosh" <santosh.shilimkar@ti.com>,
Jarkko Nikula <jhnikula@gmail.com>, hari n <hari.zoom@gmail.com>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>
Subject: Re: [OMAP3] ALSA driver 'suspend/resume' handlers
Date: Wed, 7 Oct 2009 14:42:55 -0700 [thread overview]
Message-ID: <20091007214254.GA29320@atomide.com> (raw)
In-Reply-To: <FCCFB4CDC6E5564B9182F639FC35608702F9E7DA66@dbde02.ent.ti.com>
* Pandita, Vikram <vikram.pandita@ti.com> [090924 05:59]:
>
>
> >-----Original Message-----
> >From: Shilimkar, Santosh
> >Sent: Thursday, September 24, 2009 2:24 AM
> >To: Jarkko Nikula; hari n
> >Cc: Pandita, Vikram; linux-omap@vger.kernel.org
> >Subject: RE: [OMAP3] ALSA driver 'suspend/resume' handlers
> >
> >Hari/Jarkko,
> >> -----Original Message-----
> >> From: linux-omap-owner@vger.kernel.org [mailto:linux-omap-
> >> owner@vger.kernel.org] On Behalf Of Jarkko Nikula
> >> Sent: Thursday, September 24, 2009 12:16 PM
> >> To: hari n
> >> Cc: Pandita, Vikram; linux-omap@vger.kernel.org
> >> Subject: Re: [OMAP3] ALSA driver 'suspend/resume' handlers
> >>
> >> On Wed, 23 Sep 2009 00:02:01 -0500
> >> hari n <hari.zoom@gmail.com> wrote:
> >>
<snip>
> >omap_stop_dma() should be issued when we really want to stop the DMA transfer and issuing this with
> >an outstanding transfer is a BUG in ALSA driver.
> >
> >Having said that, there is also bug in the DMA driver which doesn't disable the channel in linking
> >cases. Since we use always hardware synchronized method, hardware will take care of draining the
> >buffer so no loss of data.
> >
> >So option B should be ok and USB case also would work as mentioned above.
>
> USB is not a valid use case to discuss here.
> Mentor OTG controller has its internal DMA and so does EHCI/OHCI host controller.
> USB on OMAP3 _does_not_ use system DMA.
At least tusb6010 connected to 2420 on n800 and n810 uses the system DMA.
Tony
next prev parent reply other threads:[~2009-10-07 21:43 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-23 2:38 [OMAP3] ALSA driver 'suspend/resume' handlers hari n
2009-09-23 3:20 ` Pandita, Vikram
2009-09-23 5:02 ` hari n
2009-09-24 6:46 ` Jarkko Nikula
2009-09-24 7:24 ` Shilimkar, Santosh
2009-09-24 12:58 ` Pandita, Vikram
2009-10-07 21:42 ` Tony Lindgren [this message]
2009-09-29 15:58 ` Shilimkar, Santosh
2009-09-30 5:40 ` Jarkko Nikula
2009-09-30 6:08 ` Shilimkar, Santosh
-- strict thread matches above, loose matches on Subject: below --
2009-10-02 22:26 Shilimkar, Santosh
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