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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>
This commit is contained in:
Alexander Tsoy 2020-04-21 22:09:08 +03:00 • committed by Takashi Iwai
parent 7686e34852
commit cf9fb7b873
1 changed files with 1 additions and 0 deletions
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1
sound/usb/quirks.c
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@ -1806,6 +1806,7 @@ void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip,
*/
fp->attributes &= ~UAC_EP_CS_ATTR_FILL_MAX;
break;
case USB_ID(0x1235, 0x8200): /* Focusrite Scarlett 2i4 2nd gen */
case USB_ID(0x1235, 0x8202): /* Focusrite Scarlett 2i2 2nd gen */
case USB_ID(0x1235, 0x8205): /* Focusrite Scarlett Solo 2nd gen */
/*