| From e4d53bf814ed34637cbaa62d18a036af98a8dd95 Mon Sep 17 00:00:00 2001 |
| From: Alexander Tsoy <alexander@tsoy.me> |
| Date: Wed, 15 Jan 2020 18:13:58 +0300 |
| Subject: [PATCH] ALSA: usb-audio: add implicit fb quirk for MOTU M Series |
| |
| commit c249177944b650816069f6c49b769baaa94339dc upstream. |
| |
| This fixes crackling sound during playback. |
| |
| Further note: MOTU is known for reusing Product IDs for different |
| devices or different generations of the device (e.g. MicroBook |
| I/II/IIc shares a single Product ID). This patch was only tested with |
| M4 audio interface, but the same Product ID is also used by M2. Hope |
| it will work for M2 as well. |
| |
| Signed-off-by: Alexander Tsoy <alexander@tsoy.me> |
| Link: https://lore.kernel.org/r/20200115151358.56672-1-alexander@tsoy.me |
| Signed-off-by: Takashi Iwai <tiwai@suse.de> |
| Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> |
| |
| diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c |
| index fa24bd491cf6..ad8f38380aa3 100644 |
| --- a/sound/usb/pcm.c |
| +++ b/sound/usb/pcm.c |
| @@ -348,6 +348,10 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs, |
| ep = 0x84; |
| ifnum = 0; |
| goto add_sync_ep_from_ifnum; |
| + case USB_ID(0x07fd, 0x0008): /* MOTU M Series */ |
| + ep = 0x81; |
| + ifnum = 2; |
| + goto add_sync_ep_from_ifnum; |
| case USB_ID(0x0582, 0x01d8): /* BOSS Katana */ |
| /* BOSS Katana amplifiers do not need quirks */ |
| return 0; |
| -- |
| 2.7.4 |
| |
