Add delay to make sure that audio urbs are not sent too early. Otherwise the device hangs. Windows driver makes ~2s delay, so use about the same time delay value.

snd_usb_apply_boot_quirk() is called 3 times for my MOTU M4, which is an overkill. Thus a quirk that is called only once is implemented.

Also send two vendor-specific control messages before and after the delay. This behaviour is blindly copied from the Windows driver.

Signed-off-by: Alexander Tsoy alexander@tsoy.me --- v2 changes: indentation fixes

sound/usb/card.c | 4 ++++ sound/usb/quirks.c | 38 ++++++++++++++++++++++++++++++++++++++ sound/usb/quirks.h | 5 +++++ 3 files changed, 47 insertions(+)

diff --git a/sound/usb/card.c b/sound/usb/card.c index 9f743ebae615..2f582ac7cf78 100644 --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -600,6 +600,10 @@ static int usb_audio_probe(struct usb_interface *intf, } } if (! chip) { + err = snd_usb_apply_boot_quirk_once(dev, intf, quirk, id); + if (err < 0) + return err; + /* it's a fresh one. * now look for an empty slot and create a new card instance */ diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 82184036437b..0464df785f2e 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -1113,6 +1113,31 @@ static int snd_usb_motu_microbookii_boot_quirk(struct usb_device *dev) return err; }

+static int snd_usb_motu_m_series_boot_quirk(struct usb_device *dev) +{ + int ret; + + if (snd_usb_pipe_sanity_check(dev, usb_sndctrlpipe(dev, 0))) + return -EINVAL; + ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), + 1, USB_TYPE_VENDOR | USB_RECIP_DEVICE, + 0x0, 0, NULL, 0, 1000); + + if (ret < 0) + return ret; + + msleep(2000); + + ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), + 1, USB_TYPE_VENDOR | USB_RECIP_DEVICE, + 0x20, 0, NULL, 0, 1000); + + if (ret < 0) + return ret; + + return 0; +} + /* * Setup quirks */ @@ -1297,6 +1322,19 @@ int snd_usb_apply_boot_quirk(struct usb_device *dev, return 0; }

+int snd_usb_apply_boot_quirk_once(struct usb_device *dev, + struct usb_interface *intf, + const struct snd_usb_audio_quirk *quirk, + unsigned int id) +{ + switch (id) { + case USB_ID(0x07fd, 0x0008): /* MOTU M Series */ + return snd_usb_motu_m_series_boot_quirk(dev); + } + + return 0; +} + /* * check if the device uses big-endian samples */ diff --git a/sound/usb/quirks.h b/sound/usb/quirks.h index a80e0ddd0736..b46b108769e8 100644 --- a/sound/usb/quirks.h +++ b/sound/usb/quirks.h @@ -20,6 +20,11 @@ int snd_usb_apply_boot_quirk(struct usb_device *dev, const struct snd_usb_audio_quirk *quirk, unsigned int usb_id);

+int snd_usb_apply_boot_quirk_once(struct usb_device *dev, + struct usb_interface *intf, + const struct snd_usb_audio_quirk *quirk, + unsigned int usb_id); + void snd_usb_set_format_quirk(struct snd_usb_substream *subs, struct audioformat *fmt);