ALSA: usb-audio: Optimize TEAC clock quirk
authorTakashi Iwai <tiwai@suse.de>
Tue, 31 May 2022 13:07:49 +0000 (15:07 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 6 Jun 2022 06:47:57 +0000 (08:47 +0200)
commit07f3c531f5dc70fa44d4c535783ce95dc167256d
tree2a48b1857c358478fb44b25e561135df618e3fb5
parentbfe25df63048edd4ceaf78a2fc755d5e2befc978
ALSA: usb-audio: Optimize TEAC clock quirk

commit 3753fcc22974affa26160ce1c46a6ebaaaa86758 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
sound/usb/clock.c