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| author |   Hector Martin <marcan@marcan.st> | 2020-08-10 17:24:00 +0900 |
|---|---|---|
| committer |   Takashi Iwai <tiwai@suse.de> | 2020-08-10 12:57:12 +0200 |
| commit | 1b7ecc241a67ad6b584e071bd791a54e0cd5f097 (patch) | |
| tree | f3f50d33541982032c151bfe33a91378584f1120 /sound/usb/quirks.c | |
| parent | ALSA: hda - fix the micmute led status for Lenovo ThinkCentre AIO (diff) | |
| download | wireguard-linux-1b7ecc241a67ad6b584e071bd791a54e0cd5f097.tar.xz wireguard-linux-1b7ecc241a67ad6b584e071bd791a54e0cd5f097.zip | |
ALSA: usb-audio: work around streaming quirk for MacroSilicon MS2109
Further investigation of the L-R swap problem on the MS2109 reveals that
the problem isn't that the channels are swapped, but rather that they
are swapped and also out of phase by one sample. In other words, the
issue is actually that the very first frame that comes from the hardware
is a half-frame containing only the right channel, and after that
everything becomes offset.
So introduce a new quirk field to drop the very first 2 bytes that come
in after the format is configured and a capture stream starts. This puts
the channels in phase and in the correct order.
Cc: stable@vger.kernel.org
Signed-off-by: Hector Martin <marcan@marcan.st>
Link: https://lore.kernel.org/r/20200810082400.225858-1-marcan@marcan.st
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/quirks.c')
| -rw-r--r-- | sound/usb/quirks.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index c551141f337e..abf99b814a0f 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -1495,6 +1495,9 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs, case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */ pioneer_djm_set_format_quirk(subs); break; + case USB_ID(0x534d, 0x2109): /* MacroSilicon MS2109 */ + subs->stream_offset_adj = 2; + break; } } |