ALSA: usb-audio: Apply async workaround for Scarlett 2i4 2nd gen

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Due to rounding error driver sometimes incorrectly calculate next packet
size, which results in audible clicks on devices with synchronous playback
endpoints. For example on a high speed bus and a sample rate 44.1 kHz it
loses one sample every ~40.9 seconds. Fortunately playback interface on
Scarlett 2i4 2nd gen has a working explicit feedback endpoint, so we can
switch playback data endpoint to asynchronous mode as a workaround.

Signed-off-by: Alexander Tsoy <alexander@tsoy.me>
Link: https://lore.kernel.org/r/20200421190908.462860-1-alexander@tsoy.me
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Alexander Tsoy 2020-04-21 22:09:08 +03:00 • committed by Takashi Iwai

parent 7686e34852

commit cf9fb7b873

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sound/usb/quirks.c

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