ALSA: usb-audio: Switch back to non-latency mode at a later point
The recent regression report revealed that the judgment of the low-latency playback mode based on the runtime->stop_threshold cannot work reliably at the prepare stage, as sw_params call may happen at any time, and PCM dmix actually sets it up after the prepare call. This ended up with the stall of the stream as PCM ack won't be issued at all. For addressing this, check the free-wheeling mode again at the PCM trigger right before starting the stream again, and allow switching to the non-LL mode at a late stage. Fixes: d5f871f8 ("ALSA: usb-audio: Improved lowlatency playback support") Reported-and-tested-by:Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Link: https://lore.kernel.org/r/20211117161855.m45mxcqszkfcetai@box.shutemov.name Link: https://lore.kernel.org/r/20211119102459.7055-1-tiwai@suse.de Signed-off-by:
Takashi Iwai <tiwai@suse.de>
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76c47183
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