At Tue, 21 Oct 2008 10:49:16 +0100, Mark Brown wrote:
On Tue, Oct 21, 2008 at 05:48:56PM +0800, Cai, Cliff wrote:
From: Takashi Iwai [mailto:tiwai@suse.de]
But, CONFIG_SND_MULTICHAN_SUPPORT would change any buffer allocation behavior? I don't find it...
It will change the ac97 frame size defined in bf5xx-ac97.h,the frame size the basic unit of the DMA buffer
So this is purely a restriction in the driver, rather than a property of the hardware - is there any reason why you can't change the size of buffer that you allocate at runtime?
It'd be possible, as far as I understand. It's rather a design issue.
bf5xx driver preallocates the max size buffer. Otherwise you may get no large buffer at later fragmentation. And that size is different between with and without multi-channel support.
Takashi