From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Gerhard Pircher <gerhard_pircher@gmx.net>
Cc: linuxppc-dev@ozlabs.org, cjg@cruxppc.org
Subject: Re: [PATCH] Sam440ep support
Date: Tue, 06 May 2008 09:44:18 +1000 [thread overview]
Message-ID: <1210031058.21644.120.camel@pasglop> (raw)
In-Reply-To: <20080505195054.172000@gmx.net>
On Mon, 2008-05-05 at 21:50 +0200, Gerhard Pircher wrote:
> This is a (bad) hack that I also use on the AmigaOne to get the ALSA
> sound
> drivers working with DMA, because ALSA doesn't work with
> dma-noncoherent.c.
> The problem is the "nopage" mechanism, which fails with non coherent
> DMA
> allocations due to their own virtual address space (correct me, if I'm
> wrong).
>
> See this thread for more info:
> http://readlist.com/lists/vger.kernel.org/linux-kernel/45/226541.html
>
> This is a general problem that affects all powerpc boards that use
> dma-noncoherent.c with ALSA PCI drivers.
The link above doesn't provide any useful information on the problem and
it contains itself a non working link...
Can somebody explains exactly what's going on ? That shouldn't be hard
to fix. I can't believe the problem has been around for 2 years and
nobody actually bothered fixing it properly.
Send me a sound card that needs that hack and I can take care of it
myself.
Ben.
next prev parent reply other threads:[~2008-05-05 23:44 UTC|newest]
Thread overview: 36+ 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 [this message]
2008-05-06 7:51 ` Gerhard Pircher
2008-05-06 8:48 ` Benjamin Herrenschmidt
2008-05-06 9:16 ` Gerhard Pircher
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 12:26 ` Takashi Iwai
2008-05-14 12:50 ` Gerhard Pircher
2008-05-14 21:01 ` Gerhard Pircher
2008-05-15 5:42 ` Takashi Iwai
2008-05-15 5:42 ` Takashi Iwai
2008-05-19 17:23 ` Giuseppe Coviello
2008-05-20 12:48 ` Takashi Iwai
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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