From: Johannes Berg <johannes@sipsolutions.net>
To: Paul Mackerras <paulus@samba.org>
Cc: Takashi Iwai <tiwai@suse.de>,
alsa-devel@alsa-project.org, benjamin@sipsolutions.net
Subject: Re: [RFC/PATCH] Stop Apple i2s DMA gracefully
Date: Mon, 06 Nov 2006 11:50:57 +0100 [thread overview]
Message-ID: <1162810257.2762.19.camel@ux156> (raw)
In-Reply-To: <17743.4433.435455.686127@cargo.ozlabs.ibm.com>
On Mon, 2006-11-06 at 21:41 +1100, Paul Mackerras wrote:
> OK, this sounds like the suspend trigger should just abort the DMA, on
> the basis that the hardware will get reset in the suspend/resume
> process and so there will be no bytes queued up to cause trouble
> later. I'll whip up a patch.
I think we should cleanly stop the hardware in this case as well, for
suspend to disk I think it can happen that we suspend the driver and
then suspend is aborted. Not entirely sure about this though.
Btw. What happens when we abort the DMA engine, reset the command
pointer to a stop command, and start it again? Does it drain the FIFO
properly? I'm thinking it should, but ...
johannes
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next prev parent reply other threads:[~2006-11-06 10:49 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-29 4:19 [RFC/PATCH] Stop Apple i2s DMA gracefully Paul Mackerras
2006-10-29 8:49 ` Johannes Berg
2006-10-29 10:47 ` Paul Mackerras
2006-10-29 12:23 ` Johannes Berg
2006-10-31 14:14 ` Takashi Iwai
2006-11-01 1:05 ` Paul Mackerras
2006-11-02 8:29 ` Johannes Berg
2006-11-02 21:54 ` Paul Mackerras
2006-11-02 22:59 ` Johannes Berg
2006-11-06 10:38 ` Takashi Iwai
2006-11-06 10:41 ` Paul Mackerras
2006-11-06 10:50 ` Johannes Berg [this message]
2006-11-28 12:03 ` Takashi Iwai
2006-11-06 10:47 ` Johannes Berg
2007-02-08 13:12 ` [PATCH] aoa i2sbus: " Johannes Berg
2007-02-08 13:12 ` Johannes Berg
2007-02-08 14:07 ` Takashi Iwai
2007-02-08 14:07 ` Takashi Iwai
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