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ALSA: usb-audio: Skip probe-time interface setup for MSI MAG X570S ALC4080

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The Realtek ALC4080 USB audio on the MSI MAG X570S Tomahawk Max WiFi
(USB ID 0db0:a073, the same ID as the MAG X570S Torpedo Max mixer map)
has six streaming interfaces with 68 altsettings in total. For each of
them, __snd_usb_parse_audio_interface() switches the interface to alt 0,
initialises pitch and the sample rate and switches back, which costs
about 64 ms per altsetting here, mostly spent inside usb_set_interface().
Probing the card therefore takes about 6.4 seconds, on every boot.

That setup is redundant with snd_usb_endpoint_prepare() at stream-open
time, so set QUIRK_FLAG_SKIP_IFACE_SETUP for this device.

Tested on 7.2.11 with the equivalent quirk_flags=0db0:a073:skip_iface_setup
module option, re-probing the device via its sysfs "authorized"
attribute: probe time went from 6.45 s to 0.57 s, all 68 altsettings
are still listed in /proc/asound/cardX/stream*, and playback and
capture work.

Assisted-by: LLM
Signed-off-by: Zak Brighton Knight <zakbrightonknight@gmail.com>
Link: https://patch.msgid.link/20261026140934.3575940-1-zakbrightonknight@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Zak Brighton Knight 2026-10-26 14:09:34 +00:00 committed by Takashi Iwai
parent 8d61d55bed
commit 379ba557f5
1 changed files with 2 additions and 0 deletions
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2
sound/usb/quirks.c
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@ -2661,6 +2661,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
QUIRK_FLAG_CTL_MSG_DELAY_1M | QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE),
DEVICE_FLG(0x0d8c, 0x0102, /* C-Media CM6206 */
QUIRK_FLAG_GET_SAMPLE_RATE),
DEVICE_FLG(0x0db0, 0xa073, /* MSI MAG X570S Tomahawk/Torpedo Max (ALC4080) */
QUIRK_FLAG_SKIP_IFACE_SETUP),
DEVICE_FLG(0x0e0b, 0xfa01, /* Feaulle Rainbow */
QUIRK_FLAG_GET_SAMPLE_RATE | QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE),
DEVICE_FLG(0x0ecb, 0x205c, /* JBL Quantum610 Wireless */