ALSA: usb-audio: Optimize TEAC clock quirk
authorTakashi Iwai <tiwai@suse.de>
Tue, 31 May 2022 13:07:49 +0000 (15:07 +0200)
committerTakashi Iwai <tiwai@suse.de>
Tue, 31 May 2022 13:09:05 +0000 (15:09 +0200)
commit3753fcc22974affa26160ce1c46a6ebaaaa86758
tree33ec3f6b3ee1e293547b5e832b3a95f0deab10cf
parent9bfa7b36343c7d84370bc61c9ed774635b05e4eb
ALSA: usb-audio: Optimize TEAC clock quirk

Maris found out that the quirk for TEAC devices to work around the
clock setup is needed to apply only when the base clock is changed,
e.g. from 48000-based clocks (48000, 96000, 192000, 384000) to
44100-based clocks (44100, 88200, 176400, 352800), or vice versa,
while switching to another clock with the same base clock doesn't need
the (forcible) interface setup.

This patch implements the optimization for the TEAC clock quirk to
avoid the unnecessary interface re-setup.

Fixes: 5ce0b06ae5e6 ("ALSA: usb-audio: Workaround for clock setup on TEAC devices")
Reported-by: Maris Abele <maris7abele@gmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220531130749.30357-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/usb/clock.c