ALSA: usb-audio: Add boot quirk for MOTU M Series

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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>
Link: https://lore.kernel.org/r/20200112102358.18085-1-alexander@tsoy.me
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Alexander Tsoy 2020-01-12 13:23:58 +03:00 • committed by Takashi Iwai

parent 791a485f2d

commit 73ac9f5e5b

3 changed files with 47 additions and 0 deletions

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4

sound/usb/card.c

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38

sound/usb/quirks.c

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5

sound/usb/quirks.h

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