linux-kernel - Re: [PATCH] xhci: Prevent runtime suspend all the time with XHCI_RESET_ON

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Message-Id: <88A0FF32-C7D7-4E49-8470-FE23401371BD@canonical.com>
Date:   Mon, 4 May 2020 18:02:03 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Oliver Neukum <oneukum@...e.com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:USB XHCI DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xhci: Prevent runtime suspend all the time with
 XHCI_RESET_ON_RESUME quirk



> On May 4, 2020, at 17:47, Oliver Neukum <oneukum@...e.com> wrote:
> 
> Am Montag, den 04.05.2020, 17:19 +0800 schrieb Kai-Heng Feng:
>> Etron EJ168 USB 3.0 Host Controller stops working after S3, if it was
>> runtime suspended previously:
>> [  370.080359] pci 0000:02:00.0: can't change power state from D3cold to D0 (config space inaccessible)
> 
> Apparently this controller has issues with D3cold
> 
>> [  370.080477] xhci_hcd 0000:04:00.0: can't change power state from D3cold to D0 (config space inaccessible)
>> [  370.080532] pcieport 0000:00:1c.0: DPC: containment event, status:0x1f05 source:0x0200
>> [  370.080533] pcieport 0000:00:1c.0: DPC: ERR_FATAL detected
>> [  370.080536] xhci_hcd 0000:04:00.0: can't change power state from D3hot to D0 (config space inaccessible)
>> [  370.080552] xhci_hcd 0000:04:00.0: AER: can't recover (no error_detected callback)
>> [  370.080566] usb usb3: root hub lost power or was reset
>> [  370.080566] usb usb4: root hub lost power or was reset
>> [  370.080572] xhci_hcd 0000:04:00.0: Host halt failed, -19
>> [  370.080574] xhci_hcd 0000:04:00.0: Host not accessible, reset failed.
>> [  370.080575] xhci_hcd 0000:04:00.0: PCI post-resume error -19!
>> [  370.080586] xhci_hcd 0000:04:00.0: HC died; cleaning up
>> 
>> This can be fixed by not runtime suspend the controller at all.
>> 
>> So instead of conditionally runtime suspend the controller, always
>> prevent runtime suspend with XHCI_RESET_ON_RESUME quirk.
> 
> What does that do to other controllers that can do runtime suspend
> under the current scheme?

Ok, I'll add a new quirk specific to this controller.

Kai-Heng

> 
> 	Regards
> 		Oliver
>