kernel/sound/usb/quirks.c, branch linux-rolling-stable

ALSA: usb-audio: Avoid implicit feedback mode on DIYINHK USB Audio 2.0

2026-03-19T15:14:47Z

[ Upstream commit c5bf24c8aba1ff711226ee0f039ff01a5754692b ] 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 Signed-off-by: Sasha Levin

ALSA: usb-audio: Add QUIRK_FLAG_SKIP_IFACE_SETUP

2026-03-12T11:09:09Z

[ Upstream commit 38c322068a26a01d7ff64da92179e68cdde9860b ] Add a quirk flag to skip the usb_set_interface(), snd_usb_init_pitch(), and snd_usb_init_sample_rate() calls in __snd_usb_parse_audio_interface(). These are redundant with snd_usb_endpoint_prepare() at stream-open time. Enable the quirk for Focusrite devices, as init_sample_rate(rate_max) sets 192kHz during probing, which disables the internal mixer and Air and Safe modes. Fixes: 16f1f838442d ("Revert "ALSA: usb-audio: Drop superfluous interface setup at parsing"") Signed-off-by: Geoffrey D. Bennett Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/65a7909b15f9feb76c2a6f4f8814c240ddc50737.1771594828.git.g@b4.vu Signed-off-by: Sasha Levin

ALSA: usb-audio: Remove VALIDATE_RATES quirk for Focusrite devices

2026-03-12T11:09:09Z

[ Upstream commit a8cc55bf81a45772cad44c83ea7bb0e98431094a ] Remove QUIRK_FLAG_VALIDATE_RATES for Focusrite. With the previous commit, focusrite_valid_sample_rate() produces correct rate tables without USB probing. QUIRK_FLAG_VALIDATE_RATES sends SET_CUR requests for each rate (~25ms each) and leaves the device at 192kHz. This is a problem because that rate: 1) disables the internal mixer, so outputs are silent until an application opens the PCM and sets a lower rate, and 2) the Air and Safe modes get disabled. Fixes: 5963e5262180 ("ALSA: usb-audio: Enable rate validation for Scarlett devices") Signed-off-by: Geoffrey D. Bennett Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/09b9c012024c998c4ca14bd876ef0dce0d0b6101.1771594828.git.g@b4.vu Signed-off-by: Sasha Levin

ALSA: usb-audio: Add iface reset and delay quirk for AB13X USB Audio

2026-03-04T12:20:17Z

[ Upstream commit ac656d7d7c70f7c352c7652bc2bb0c1c8c2dde08 ] Setting up the interface when suspended/resumeing fail on this card. Adding a reset and delay quirk will eliminate this problem. usb 1-1: New USB device found, idVendor=001f, idProduct=0b21 usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-1: Product: AB13X USB Audio usb 1-1: Manufacturer: Generic usb 1-1: SerialNumber: 20210926172016 Signed-off-by: Lianqin Hu Link: https://patch.msgid.link/TYUPR06MB6217522D0DB6E2C9DF46B56ED265A@TYUPR06MB6217.apcprd06.prod.outlook.com Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin

ALSA: usb-audio: Add DSD support for iBasso DC04U

2026-03-04T12:20:16Z

[ Upstream commit fe7cd89f0e29f0852316857b4861309f9b891370 ] Vendor ID 0x0661 is assigned to Hamamatsu Photonics K.K., but is used by iBasso for iBasso DC04U (0x0661:0x0883), which supports native DSD playback. This patch adds QUIRK_FLAG_DSD_RAW for iBasso DC04U, enabling native DSD playback (DSD_U32_BE). The change has been verified on Arch Linux using mpd and pw-cat. Signed-off-by: Qihang Guo Link: https://patch.msgid.link/TYYPR01MB14098529E0BD900921BE6F42CF465A@TYYPR01MB14098.jpnprd01.prod.outlook.com Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin

ALSA: usb-audio: Relax __free() variable declarations

2026-02-26T23:00:57Z

[ Upstream commit 03f705b9ca58b91c6dffe64875ea3d9a38cad9b5 ] We used to have a variable declaration with __free() initialized with NULL. This was to keep the old coding style rule, but recently it's relaxed and rather recommends to follow the new rule to declare in place of use for __free() -- which avoids potential deadlocks or UAFs with nested cleanups. Although the current code has no bug, per se, let's follow the new standard and move the declaration to the place of assignment (or directly assign the allocated result) instead of NULL initializations. Note that there are still a few remaining __free(kfree) with NULL initializations; they are because of the code complexity (the data size calculation). Fixes: 43d4940c944c ("ALSA: usb: scarlett2: Clean ups with guard() and __free()") Fixes: 46757a3e7d50 ("ALSA: FCP: Add Focusrite Control Protocol driver") Fixes: f7d306b47a24 ("ALSA: usb-audio: Fix a DMA to stack memory bug") Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20251216140634.171890-12-tiwai@suse.de Signed-off-by: Sasha Levin

ALSA: usb-audio: Add delay quirk for MOONDROP Moonriver2 Ti

2026-01-19T08:11:43Z

Audio control requests that sets sampling frequency sometimes fail on this card. Adding delay between control messages eliminates that problem. usb 1-1: New USB device found, idVendor=2fc6, idProduct=f06b usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-1: Product: MOONDROP Moonriver2 Ti usb 1-1: Manufacturer: MOONDROP usb 1-1: SerialNumber: MOONDROP Moonriver2 Ti Signed-off-by: Lianqin Hu Reviewed-by: Cryolitia PukNgae Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/TYUPR06MB6217911EFC7E9224935FA507D28DA@TYUPR06MB6217.apcprd06.prod.outlook.com

ALSA: usb-audio: Reorder USB mode selection quirk

2025-12-13T09:33:22Z

When using mode selection quirk, apply the quirk before rate setting. Also apply this quirk on certain newer ITF interface devices. Signed-off-by: Jussi Laako Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20251211152224.1780782-2-jussi@sonarnerd.net

ALSA: usb-audio: Update for native DSD support quirks

2025-12-13T09:33:22Z

Maintenance patch for native DSD support. Add set of missing device and vendor quirks; TEAC, Esoteric, Luxman and Musical Fidelity. Signed-off-by: Jussi Laako Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20251211152224.1780782-1-jussi@sonarnerd.net

ALSA: usb-audio: Add DSD quirk for LEAK Stereo 230

2025-11-17T16:27:32Z

Integrated amplifier LEAK Stereo 230 by IAG Limited has built-in ESS9038Q2M DAC served by XMOS controller. It supports both DSD Native and DSD-over-PCM (DoP) operational modes. But it doesn't work properly by default and tries DSD-to-PCM conversion. USB quirks below allow it to operate as designed. Add DSD_RAW quirk flag for IAG Limited devices (vendor ID 0x2622) Add DSD format quirk for LEAK Stereo 230 (USB ID 0x2622:0x0061) Signed-off-by: Ivan Zhaldak Cc: Link: https://patch.msgid.link/20251117125848.30769-1-i.v.zhaldak@gmail.com Signed-off-by: Takashi Iwai