[alsa-devel] [PATCH] ALSA: ASoC V2: Improve pause/unpause performance in Freescale 8610 drivers
broonie at opensource.wolfsonmicro.com
Wed Aug 6 10:47:10 CEST 2008
On Tue, Aug 05, 2008 at 02:37:31PM -0500, Timur Tabi wrote:
> Signed-off-by: Timur Tabi <timur at freescale.com>
> + * Wait until the SSI has filled its FIFO. Without this
> + * delay, ALSA complains about overruns. When the FIFO
> + * is full, the DMA controller initiates its first
> + * transfer. Until then, however, the DMA's DAR
> + * register is zero, which translates to an
> + * out-of-bounds pointer. This makes ALSA think an
> + * overrun has occurred.
> - mdelay(1);
> + while (!(in_be32(&ssi->sisr) & CCSR_SSI_SISR_RFF0));
It'd be nice to have a timeout here in case the FIFO never fills.
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