From: Takashi Iwai Date: Wed, 25 Feb 2026 08:52:30 +0000 (+0100) Subject: ALSA: usb-audio: Avoid implicit feedback mode on DIYINHK USB Audio 2.0 X-Git-Tag: ceph-for-7.0-rc4~87^2~11 X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=c5bf24c8aba1ff711226ee0f039ff01a5754692b;p=ceph-client.git ALSA: usb-audio: Avoid implicit feedback mode on DIYINHK USB Audio 2.0 Although DIYINHK USB Audio 2.0 (ID 20b1:2009) shows the implicit feedback source for the capture stream, this would cause several problems for the playback. Namely, the device can get wMaxPackSize 1024 for 24/32 bit format with 6 channels, and when a high sample rate like 352.8kHz or 384kHz is played, the packet size overflows the max limit. Also, the device has another two playback altsets, and those aren't properly handled with the implicit feedback. Since the device has been working well even before introducing the implicit feedback, we can assume that it works fine in the async mode. This patch adds the explicit skip of the implicit fb detection to make the playback running in the async mode. Link: https://bugzilla.kernel.org/show_bug.cgi?id=221076 Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20260225085233.316306-4-tiwai@suse.de Signed-off-by: Takashi Iwai --- diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index fbceed8e8d36..c6a78efbcaa3 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -2365,6 +2365,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = { QUIRK_FLAG_SHARE_MEDIA_DEVICE | QUIRK_FLAG_ALIGN_TRANSFER), DEVICE_FLG(0x2040, 0x7281, /* Hauppauge HVR-950Q-MXL */ QUIRK_FLAG_SHARE_MEDIA_DEVICE | QUIRK_FLAG_ALIGN_TRANSFER), + DEVICE_FLG(0x20b1, 0x2009, /* XMOS Ltd DIYINHK USB Audio 2.0 */ + QUIRK_FLAG_SKIP_IMPLICIT_FB | QUIRK_FLAG_DSD_RAW), DEVICE_FLG(0x2040, 0x8200, /* Hauppauge Woodbury */ QUIRK_FLAG_SHARE_MEDIA_DEVICE | QUIRK_FLAG_ALIGN_TRANSFER), DEVICE_FLG(0x21b4, 0x0081, /* AudioQuest DragonFly */