Dne 15. 05. 20 v 11:04 Lu, Brent napsal(a):
Is this a bugfix needed for older kernels as well? When did this issue show
up?
thanks,
greg k-h
It happens when DMA stop moving data from host to DSP/DAI for a long time
(> half of buffer time). I know host driver should do something about it. But if
not, the HWSYNC will keep increasing the hw_base and hw_ptr and confuses
user space program.
I'm afraid, but with this code, you turn off the hw_ptr jiffies code. It would
be better to fix the driver in this case (return the updated / estimated DMA
pointer, increase DMA buffer size etc.). This "lag" is unacceptable.
Jaroslav
Regards,
Brent
--
Jaroslav Kysela <perex@xxxxxxxx>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.
