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Subject: Re: [PATCH] xhci: Prevent runtime suspend all the time with
 XHCI_RESET_ON_RESUME quirk
From:   Oliver Neukum <oneukum@suse.com>
To:     Kai-Heng Feng <kai.heng.feng@canonical.com>,
        mathias.nyman@intel.com
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "open list:USB XHCI DRIVER" <linux-usb@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>
Date:   Mon, 04 May 2020 11:47:35 +0200
In-Reply-To: <20200504091952.15820-1-kai.heng.feng@canonical.com>
References: <20200504091952.15820-1-kai.heng.feng@canonical.com>
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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?

	Regards
		Oliver