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linux-stable/sound
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Takashi Iwai eee5d6f135 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: d5f871f89e ("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>
2021-11-19 11:27:41 +01:00
..
ac97 bus: Make remove callback return void 2021-07-21 11:53:42 +02:00
aoa Kbuild updates for v5.15 2021-09-03 15:33:47 -07:00
arm ALSA: pxa2xx: Use managed PCM buffer allocation 2021-08-04 08:08:21 +02:00
atmel
core ALSA: memalloc: Remove a stale comment 2021-11-10 07:35:23 +01:00
drivers ALSA: pcsp: Make hrtimer forwarding more robust 2021-09-28 10:58:08 +02:00
firewire ALSA: fireworks: add support for Loud Onyx 1200f quirk 2021-11-11 14:02:02 +01:00
hda ASoC: Updates for v5.16 2021-11-01 16:58:27 +01:00
i2c ALSA: i2c: tea6330t: Remove redundant initialization of variable err 2021-06-12 09:32:14 +02:00
isa ALSA: gus: fix null pointer dereference on pointer block 2021-10-26 08:02:16 +02:00
mips ALSA: n64: check return value after calling platform_get_resource() 2021-06-12 09:31:13 +02:00
oss sound/oss/dmasound: Remove superfluous "break" 2021-05-27 08:24:23 +02:00
parisc parisc architecture updates for kernel 5.15: 2021-09-02 13:16:00 -07:00
pci ALSA: ctxfi: Fix out-of-range access 2021-11-18 22:57:55 +01:00
pcmcia ALSA: vx: Manage vx_core object with devres 2021-07-19 16:17:09 +02:00
ppc ALSA: ppc: fix error return code in snd_pmac_probe() 2021-06-16 08:52:29 +02:00
sh
soc ASoC: Fixes for v5.16 2021-11-18 18:57:41 +01:00
sparc ALSA: sparc: Fix assignment in if condition 2021-06-09 17:30:29 +02:00
spi
synth ALSA: synth: missing check for possible NULL after the call to kstrdup 2021-11-09 07:18:50 +01:00
usb ALSA: usb-audio: Switch back to non-latency mode at a later point 2021-11-19 11:27:41 +01:00
virtio ALSA: virtio: Replace zero-length array with flexible-array member 2021-09-30 13:47:57 +02:00
x86 ALSA: memalloc: Correctly name as WC 2021-08-04 08:07:58 +02:00
xen
ac97_bus.c
Kconfig
last.c
Makefile
sound_core.c