[PATCH] ALSA: usb-audio: Add support for MOTU MicroBook IIc

[Takashi Iwai]

On Sat, 29 Feb 2020 16:18:15 +0100,
Alexander Tsoy wrote:
> 
> MicroBook IIc operates in UAC2 mode by default. This patch addresses
> several issues with it:
> 
> - MicroBook II and IIc shares the same USB ID. We can distinguish them
>   by interface class.
> - MaxPacketsOnly attribute is erroneously set in endpoint descriptors.
>   As a result this card produces noise with all sample rates other than
>   96 KHz. This also causes issues like IOMMU page faults and other
>   problems with host controller.
> - Sample rate changes takes more than 2 seconds for this device. Clock
>   validity request returns false during that period, so the clock validity
>   quirk is required.
> 
> Signed-off-by: Alexander Tsoy <alexander at tsoy.me>

Applied now.  Thanks.


Takashi