Re: [PATCH V4 0/3] ARM: dts: bcm2711: Add BCM2711 xHCI support

[Cyril Brulebois <kibi@debian.org>]

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Stefan Wahren <wahrenst@gmx.net> (2023-12-05):
> In contrast to the Raspberry Pi 4, the Compute Module 4 or the IO board
> does not have a VL805 USB 3.0 host controller, which is connected via
> PCIe. Instead, the Compute Module provides the built-in
> xHCI of the BCM2711 SoC.
> 
> Changes in V4:
> - use "brcm,xhci-brcm-v2" as fallback compatible as suggested by
>   Conor & Florian
> 
> Changes in V3:
> - introduce a new compatible for BCM2711 in order to make the
>   power domain dependency SoC specific, which also results in
>   a driver change

This is still:

Tested-by: Cyril Brulebois <cyril@debamax.com>


Again, I'm also applying Jim Quinlan's PCIe patch series v8, to be able
to fully test what happens with USB devices, onboard and behind PCIe:
  https://lore.kernel.org/all/20231126201946.ffm3bhg5du2xgztv@mraw.org/

With the following on a CM4 IO Board, with a Samsung flash drive and a
USB keyboard connected to onboard USB ports:
 - CM4 Lite Rev 1.0
 - CM4 8/32 Rev 1.0
 - CM4 4/32 Rev 1.1

and using one of the three PCIe-to-USB boards referenced previously,
connecting another Samsung flash drive on one of its USB ports.

Conclusion: I can see and use onboard USB devices alongside behind-PCIe
USB devices, either with or without adding otg_mode=1 to config.txt.

On a CM4-based product that uses both onboard USB ports and PCIe-to-USB
ports, all USB components still work fine (3 RF adapters, 1 modem), with
or without otg_mode=1.

(All of this is still with a Debian 12 arm64 user space.)


Cheers,
-- 
Cyril Brulebois (kibi@debian.org)            <https://debamax.com/>
D-I release manager -- Release team member -- Freelance Consultant

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