This is a note to let you know that I've just added the patch titled
ALSA: usb-audio: Add quirk flag for HEM devices to enable native DSD playback
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-usb-audio-add-quirk-flag-for-hem-devices-to-enable-native-dsd-playback.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 122e2cb7e1a30438cc0e8bf70d4279db245d7d5b Mon Sep 17 00:00:00 2001
From: Lukasz Tyl <ltyl@xxxxxxxxx>
Date: Wed, 14 Jun 2023 14:25:24 +0200
Subject: ALSA: usb-audio: Add quirk flag for HEM devices to enable native DSD playback
From: Lukasz Tyl <ltyl@xxxxxxxxx>
commit 122e2cb7e1a30438cc0e8bf70d4279db245d7d5b upstream.
This commit adds new DEVICE_FLG with QUIRK_FLAG_DSD_RAW and Vendor Id for
HEM devices which supports native DSD. Prior to this change Linux kernel
was not enabling native DSD playback for HEM devices, and as a result,
DSD audio was being converted to PCM "on the fly". HEM devices,
when connected to the system, would only play audio in PCM format,
even if the source material was in DSD format. With the addition of new
VENDOR_FLG in the quircks.c file, the devices are now correctly
recognized, and raw DSD data is transmitted to the device,
allowing for native DSD playback.
Signed-off-by: Lukasz Tyl <ltyl@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230614122524.30271-1-ltyl@xxxxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/usb/quirks.c | 2 ++
1 file changed, 2 insertions(+)
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1921,6 +1921,8 @@ static const struct usb_audio_quirk_flag
QUIRK_FLAG_DSD_RAW),
VENDOR_FLG(0x2ab6, /* T+A devices */
QUIRK_FLAG_DSD_RAW),
+ VENDOR_FLG(0x3336, /* HEM devices */
+ QUIRK_FLAG_DSD_RAW),
VENDOR_FLG(0x3353, /* Khadas devices */
QUIRK_FLAG_DSD_RAW),
VENDOR_FLG(0x3842, /* EVGA */
Patches currently in stable-queue which might be from ltyl@xxxxxxxxx are
queue-5.15/alsa-usb-audio-add-quirk-flag-for-hem-devices-to-enable-native-dsd-playback.patch
