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ALSA: usb-audio: Skip clock selector for Focusrite devices

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Add QUIRK_FLAG_SKIP_CLOCK_SELECTOR for Focusrite devices.

During interface parsing, snd_usb_clock_find_source() reads the clock
selector value then writes it back unchanged. On Focusrite devices
this redundant write results in a ~300ms delay per altsetting, adding
~1.8s to probe time on a typical device with 6 altsettings.

Enabling SKIP_CLOCK_SELECTOR skips the redundant write-back.

Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/00e53ae0a508b41516b41833daa17823381a649c.1771594828.git.g@b4.vu
This commit is contained in:
Geoffrey D. Bennett 2026-02-21 02:36:56 +10:30 committed by Takashi Iwai
parent 38c322068a
commit 0d58273be0
1 changed files with 1 additions and 0 deletions
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sound/usb/quirks.c
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@ -2424,6 +2424,7 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
VENDOR_FLG(0x07fd, /* MOTU */
QUIRK_FLAG_VALIDATE_RATES),
VENDOR_FLG(0x1235, /* Focusrite Novation */
QUIRK_FLAG_SKIP_CLOCK_SELECTOR |
QUIRK_FLAG_SKIP_IFACE_SETUP),
VENDOR_FLG(0x1511, /* AURALiC */
QUIRK_FLAG_DSD_RAW),