At Mon, 27 Apr 2009 16:15:12 +0100, Mark Brown wrote:
On Mon, Apr 27, 2009 at 05:09:27PM +0200, Jaroslav Kysela wrote:
Appearently, FIFO is too big. I'm working on some changes to take account fifo_size to the jiffies based check. Please, set fifo_size correctly in your driver. USB drivers with big "URB FIFOs" should be changed as well, too.
Could you expand a bit on what qualifies as "too big" here? I've not been following the thread here or the changes that caused problems.
It's bigger than the pre-defined tolerance of jiffies check in PCM core code.
The new PCM core checks the returned hw_ptr together with jiffies delta whether it's a sane value. When FIFO is used with the ring buffer, the hardware tends to report back earlier before the expected timing.
Takashi