[PATCH 2/6] usb: xhci: Set up endpoints for the first 2 interfaces

[Janne Grunau]

On Wed, Feb 21, 2024, at 13:39, Marek Vasut wrote:
> On 2/21/24 08:25, Janne Grunau via B4 Relay wrote:
>> From: Janne Grunau <j at jannau.net>
>> 
>> Apple USB keyboards carry the HID keyboard boot protocol on the second
>> interface. Using the second interface in the USB keyboard driver does
>> not work since the xhci has not allocated a transfer ring.
>
> So, what does this patch do ? That is not clear from the commit message.

rewritten for v2:
| usb: xhci: Set up endpoints for the first 2 interfaces
|    
| The xhci driver currently only does the necessary initialization for
| endpoints found in the first interface descriptor. Apple USB keyboards
| (released 2021) use the second interface descriptor for the HID keyboard
| boot protocol. To allow USB drivers to use endpoints from other
| interface descriptors the xhci driver needs to ensure these endpoints
| are initialized as well.
| Use USB_MAX_ACTIVE_INTERFACES to control how many interface descriptors
| are initialized and useable. Currently defined to 2 as that is enough to
| make the Apple keyboard usable.

>
> btw. missing SoB line.

added

Thanks

Janne