From: Ralf Baechle <ralf@linux-mips.org>
To: Takashi Iwai <tiwai@suse.de>
Cc: linux-mips@linux-mips.org, alsa-devel@alsa-project.org,
greg@kroah.com, Atsushi Nemoto <anemo@mba.ocn.ne.jp>,
tiansm@lemote.com, jiankemeng@gmail.com
Subject: Re: ALSA on MIPS platform
Date: Wed, 8 Aug 2007 12:58:52 +0100 [thread overview]
Message-ID: <20070808115852.GA6700@linux-mips.org> (raw)
In-Reply-To: <s5hlkcnmbll.wl%tiwai@suse.de>
On Tue, Aug 07, 2007 at 08:41:10PM +0200, Takashi Iwai wrote:
> > It's ALSA that is doing funny things here so there is no point in fixing
> > the arch code to work for ALSA.
>
> Yep, but OTOH, the arch code doesn't provide a proper standard way to
> mmap the pages allocated via dma_alloc_coherent(). That's the missing
> piece, especially on mips and sparc. ARM has already one.
>
> My wish is implementing dma_mmap_coherent() on all architectures, so
> that the driver can use it safely without messy ifdefs.
Adding dma_mmap_coherent has been proposed in 2004 but the discussion for
some reason went nowhere because it apparently isn't implementable on
PARISC due to cache synonyms - on MIPS we'd solve those issues where they
exist by using uncached or writethrough mappings, as apropriate.
Ralf
WARNING: multiple messages have this Message-ID (diff)
From: Ralf Baechle <ralf@linux-mips.org>
To: Takashi Iwai <tiwai@suse.de>
Cc: Atsushi Nemoto <anemo@mba.ocn.ne.jp>,
jiankemeng@gmail.com, tiansm@lemote.com,
linux-mips@linux-mips.org, alsa-devel@alsa-project.org,
greg@kroah.com
Subject: Re: ALSA on MIPS platform
Date: Wed, 8 Aug 2007 12:58:52 +0100 [thread overview]
Message-ID: <20070808115852.GA6700@linux-mips.org> (raw)
In-Reply-To: <s5hlkcnmbll.wl%tiwai@suse.de>
On Tue, Aug 07, 2007 at 08:41:10PM +0200, Takashi Iwai wrote:
> > It's ALSA that is doing funny things here so there is no point in fixing
> > the arch code to work for ALSA.
>
> Yep, but OTOH, the arch code doesn't provide a proper standard way to
> mmap the pages allocated via dma_alloc_coherent(). That's the missing
> piece, especially on mips and sparc. ARM has already one.
>
> My wish is implementing dma_mmap_coherent() on all architectures, so
> that the driver can use it safely without messy ifdefs.
Adding dma_mmap_coherent has been proposed in 2004 but the discussion for
some reason went nowhere because it apparently isn't implementable on
PARISC due to cache synonyms - on MIPS we'd solve those issues where they
exist by using uncached or writethrough mappings, as apropriate.
Ralf
next prev parent reply other threads:[~2007-08-08 11:59 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-01 7:56 ALSA on MIPS platform Songmao Tian
2007-08-02 14:56 ` Atsushi Nemoto
2007-08-03 13:50 ` Songmao Tian
2007-08-03 13:50 ` Songmao Tian
2007-08-03 13:59 ` Takashi Iwai
2007-08-03 13:59 ` [alsa-devel] " Takashi Iwai
2007-08-03 15:57 ` Songmao Tian
2007-08-03 15:57 ` [alsa-devel] " Songmao Tian
2007-08-06 12:17 ` Takashi Iwai
2007-08-06 12:17 ` [alsa-devel] " Takashi Iwai
2007-08-07 5:53 ` Dajie Tan
2007-08-07 6:18 ` Dajie Tan
2007-08-07 14:01 ` Atsushi Nemoto
2007-08-07 17:54 ` Ralf Baechle
2007-08-07 17:54 ` Ralf Baechle
2007-08-07 18:41 ` Takashi Iwai
2007-08-07 18:41 ` Takashi Iwai
2007-08-08 11:58 ` Ralf Baechle [this message]
2007-08-08 11:58 ` Ralf Baechle
2007-08-08 12:40 ` Maciej W. Rozycki
2007-08-08 12:57 ` Takashi Iwai
2007-08-08 12:57 ` Takashi Iwai
2007-08-09 1:24 ` Songmao Tian
2007-08-09 1:24 ` Songmao Tian
2007-08-08 0:40 ` Songmao Tian
2007-08-08 0:40 ` [alsa-devel] " Songmao Tian
-- strict thread matches above, loose matches on Subject: below --
2006-01-25 14:50 Atsushi Nemoto
2006-01-25 19:03 ` Takashi Iwai
2006-01-26 15:29 ` Atsushi Nemoto
2006-01-26 16:02 ` Takashi Iwai
2006-01-26 19:19 ` Hugh Dickins
2006-01-27 15:45 ` Atsushi Nemoto
2006-01-27 15:49 ` Martin Michlmayr
2006-01-27 16:01 ` Takashi Iwai
2006-01-27 15:57 ` Takashi Iwai
2006-01-30 9:56 ` Atsushi Nemoto
2006-01-30 10:18 ` Takashi Iwai
2006-01-30 10:38 ` Atsushi Nemoto
2006-01-30 12:25 ` Ralf Baechle
2006-01-30 15:46 ` Martin Michlmayr
2006-01-30 15:52 ` Takashi Iwai
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