linux-kernel - Re: [PATCH] xhci: print warning when HCE was set

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Date:   Mon, 26 Sep 2022 10:58:18 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     liulongfang <liulongfang@...wei.com>, gregkh@...uxfoundation.org,
        mathias.nyman@...el.com
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        yisen.zhuang@...wei.com
Subject: Re: [PATCH] xhci: print warning when HCE was set

On 24.9.2022 5.35, liulongfang wrote:
> On 2022/9/22 21:01, Mathias Nyman Wrote:
>> Hi
>>
>> On 15.9.2022 4.11, Longfang Liu wrote:
>>> When HCE(Host Controller Error) is set, it means that the xhci hardware
>>> controller has an error at this time, but the current xhci driver
>>> software does not log this event.
>>>
>>> By adding an HCE event detection in the xhci interrupt processing
>>> interface, a warning log is output to the system, which is convenient
>>> for system device status tracking.
>>>
>>
>> xHC should cease all activity when it sets HCE, and is probably not
>> generating interrupts anymore.
>>
>> Would probably be more useful to check for HCE at timeouts than in the
>> interrupt handler.
>>
> 
> Which function of the driver code is this timeout in?

xhci_handle_command_timeout() will usually trigger at some point,

> 
>> If this is something seen on actual hardware then it makes sense to add it.
>>
> 
> This HCE error is sure to report an interrupt on the chip we are using.

Ok, then makes sense to add this patch.

Thanks
-Mathias