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Re: ALSA on MIPS platform

To: Takashi Iwai <>
Subject: Re: ALSA on MIPS platform
From: Ralf Baechle <>
Date: Wed, 8 Aug 2007 12:58:52 +0100
Cc: Atsushi Nemoto <>,,,,,
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <> <> <> <>
User-agent: Mutt/1.5.14 (2007-02-12)
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.


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