[alsa-devel] ALSA fixes for non-coherent archs (Re: [PATCH] Sam440ep support)

[Takashi Iwai]

At Mon, 19 May 2008 19:23:10 +0200,
Giuseppe Coviello wrote:
> 
> On mer, 14/05/2008 14.26 +0200, Takashi Iwai wrote:
> [cut]
> > OK, here is another patch for testing.  Since I lost my old patch
> > somewhere (and it's not worth to dig the archive), I wrote it up
> > quickly from scratch.  This version should cover both SG and non-SG
> > buffers.  It's against the latest git tree.
> > 
> > The patch adds a hackish verison of dma_mmap_coherent() for some
> > architectures in sound/core/pcm_native.c.  I'm not sure whether this
> > works.  I just tested it on X86.  It'd be appreciated if someone can
> > test this.
> > 
> > Also, this disables HDSPM driver for non-X86/IA64 since the driver has
> > own copy and silence methods that are incompatible with the new
> > SG-buffer data.
> > 
> > 
> > And, yes, I know we need to clean up huge messes in ALSA memory
> > handling routines.  But, let's fix obvious bugs before starting a big
> > rewrite...
> > 
> 
> I've just tested this patch on the sam440ep and it works great (and
> sounds great, of course). I had also to make the following changes:

Hmm, weird.  cs4281 has no SG buffer at all, so basically it cannot
work like that...

FYI, the latest patches can be found on
    git://git.kernel.org/pub/scm/linux/kernel/tiwai/sound-unstable-2.6.git


thanks,

Takashi


> 
> Signed-off-by: Giuseppe Coviello <gicoviello at gmail.com>
> 
> diff --git a/sound/pci/cs4281.c b/sound/pci/cs4281.c
> index 7556fd9..f5f208e 100644
> --- a/sound/pci/cs4281.c
> +++ b/sound/pci/cs4281.c
> @@ -952,6 +952,9 @@ static struct snd_pcm_ops snd_cs4281_playback_ops = {
>  	.prepare =	snd_cs4281_playback_prepare,
>  	.trigger =	snd_cs4281_trigger,
>  	.pointer =	snd_cs4281_pointer,
> +	.copy =         snd_pcm_sgbuf_ops_copy,
> +	.silence =      snd_pcm_sgbuf_ops_silence,
> +       .page =         snd_pcm_sgbuf_ops_page,
>  };
>  
>  static struct snd_pcm_ops snd_cs4281_capture_ops = {
> @@ -963,6 +966,8 @@ static struct snd_pcm_ops snd_cs4281_capture_ops = {
>  	.prepare =	snd_cs4281_capture_prepare,
>  	.trigger =	snd_cs4281_trigger,
>  	.pointer =	snd_cs4281_pointer,
> +	.copy =         snd_pcm_sgbuf_ops_copy,
> +       .page =         snd_pcm_sgbuf_ops_page,
>  };
>  
>  static int __devinit snd_cs4281_pcm(struct cs4281 * chip, int device,
> 
>