linux-kernel - Re: [PATCH v2] usb: xhci: print xhci->xhc_state when queue

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Message-ID: <20250726111101.5928e289@foxbook>
Date: Sat, 26 Jul 2025 11:11:01 +0200
From: Michał Pecio <michal.pecio@...il.com>
To: Su Hui <suhui@...china.com>
Cc: mathias.nyman@...el.com, gregkh@...uxfoundation.org,
 linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
 kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2] usb: xhci: print xhci->xhc_state when queue_command
 failed

On Fri, 25 Jul 2025 19:32:37 +0800, Su Hui wrote:
> On 2025/7/25 18:03, Michał Pecio wrote:
> >> Hmm, any chance you came across bugs that upstream should know about?  
> Actually, this bug is specific to the 5.4 version of the kernel and a 
> particular USB camera. I am working
> to resolve this issue. When the xhci_hcd is initialized, the driver sets 
> xhc_state to "halted", but before
> the xhci_hcd calls xhci_start, the hub starts Initializing. Hub 
> initialization failed due to xhc_state being
> halted. Perhaps this issue is caused by hardware...

Trying to queue commands before the chip is ready sounds like a SW bug.
5.4 is ancient (and EOL soon), newer releases may have this bug fixed.