From: "Gerhard Pircher" <gerhard_pircher@gmx•net>
To: benh@kernel•crashing.org
Cc: tiwai@suse•de, linuxppc-dev@ozlabs•org, cjg@cruxppc•org
Subject: Re: [PATCH] Sam440ep support
Date: Tue, 06 May 2008 11:16:22 +0200 [thread overview]
Message-ID: <20080506091622.269180@gmx.net> (raw)
In-Reply-To: <1210063719.21644.162.camel@pasglop>
-------- Original-Nachricht --------
> Datum: Tue, 06 May 2008 18:48:39 +1000
> Von: Benjamin Herrenschmidt <benh@kernel•crashing.org>
> An: Gerhard Pircher <gerhard_pircher@gmx•net>
> CC: linuxppc-dev@ozlabs•org, Takashi Iwai <tiwai@suse•de>, cjg@cruxppc•org, galak@kernel•crashing.org
> Betreff: Re: [PATCH] Sam440ep support
>
> On Tue, 2008-05-06 at 09:51 +0200, Gerhard Pircher wrote:
> > Takashi Iwai posted a preliminary patch a long time ago. I tested it
> > on my machine and it failed with non coherent scatter-gather DMA
> > allocations (I guess almost all ALSA PCI drivers use SG DMA?).
>
> How does Alsa allocate such SG ?
I can't answer this question. *ducked* :-) Takashi?
FYI: I posted the results of the test with Takashi's dma_mmap_coherent
patch here:
http://ozlabs.org/pipermail/linuxppc-dev/2006-June/024078.html
On the other side it looks like this problem does not only affect ALSA.
As far as I can tell also some V4L(2) drivers have a problem with mmaping
non coherent DMA allocations, but I'm not sure (it's a long time since I
did some tests with video cards on my AmigaOne).
Naturally I can do some tests, if you or Takashi come up with a new
patch.
Thanks!
Gerhard
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next prev parent reply other threads:[~2008-05-06 9:16 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-05 18:23 [PATCH] Sam440ep support Giuseppe Coviello
2008-05-05 18:27 ` Kumar Gala
2008-05-05 19:50 ` Gerhard Pircher
2008-05-05 23:44 ` Benjamin Herrenschmidt
2008-05-06 7:51 ` Gerhard Pircher
2008-05-06 8:48 ` Benjamin Herrenschmidt
2008-05-06 9:16 ` Gerhard Pircher [this message]
2008-05-06 10:12 ` Benjamin Herrenschmidt
2008-05-06 11:14 ` Takashi Iwai
2008-05-06 11:25 ` Benjamin Herrenschmidt
2008-05-06 11:27 ` Benjamin Herrenschmidt
2008-05-06 11:31 ` Takashi Iwai
2008-05-06 11:34 ` Benjamin Herrenschmidt
2008-05-14 12:26 ` ALSA fixes for non-coherent archs (Re: [PATCH] Sam440ep support) Takashi Iwai
2008-05-14 12:50 ` Gerhard Pircher
2008-05-14 21:01 ` Gerhard Pircher
2008-05-15 5:42 ` Takashi Iwai
2008-05-19 17:23 ` Giuseppe Coviello
2008-05-20 12:48 ` Takashi Iwai
2008-05-05 23:38 ` [PATCH] Sam440ep support Benjamin Herrenschmidt
2008-05-05 18:54 ` Josh Boyer
2008-05-05 23:40 ` Benjamin Herrenschmidt
2008-05-06 0:09 ` Josh Boyer
2008-05-05 23:36 ` Benjamin Herrenschmidt
2008-05-06 4:18 ` Sean MacLennan
2008-05-06 16:37 ` Giuseppe Coviello
2008-05-09 15:53 ` Giuseppe Coviello
2008-05-09 20:26 ` Josh Boyer
2008-05-19 12:47 ` Josh Boyer
2008-05-19 15:20 ` Giuseppe Coviello
2008-05-20 12:50 ` Josh Boyer
2008-05-20 13:34 ` Josh Boyer
2008-05-22 17:51 ` Giuseppe Coviello
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