linux-kernel - Re: [PATCH] usb:solve resume usb device identification problem

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Message-ID: <57843CC3.7050204@linux.intel.com>
Date:	Tue, 12 Jul 2016 08:41:39 +0800
From:	Lu Baolu <baolu.lu@...ux.intel.com>
To:	Pengcheng Li <lpc.li@...ilicon.com>, gregkh@...uxfoundation.org,
	stern@...land.harvard.edu, chasemetzger15@...il.com,
	mathias.nyman@...ux.intel.com, oneukum@...e.com,
	jun.li@...escale.com
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb:solve resume usb device identification problem

Hi,

On 07/11/2016 08:57 PM, Pengcheng Li wrote:
> A usb device in the connection state. Then host is suspend and resume.
> But the usb device could not be at the right speed. We should be reset
> the reset.

Have you tried applying XHCI_RESET_ON_RESUME quirk to your
host controller driver? Is your usb device self powered?

Best regards,
Lu  Baolu

>
> Signed-off-by: Pengcheng Li <lpc.li@...ilicon.com>
> ---
>  drivers/usb/core/hub.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index bee1351..cd71bb3 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -3455,7 +3455,7 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
>  	struct usb_hub	*hub = usb_hub_to_struct_hub(udev->parent);
>  	struct usb_port *port_dev = hub->ports[udev->portnum  - 1];
>  	int		port1 = udev->portnum;
> -	int		status;
> +	int		status, retval;
>  	u16		portchange, portstatus;
>  
>  	if (!test_and_set_bit(port1, hub->child_usage_bits)) {
> @@ -3512,6 +3512,10 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
>  		}
>  	}
>  
> +	retval = hub_port_reset(hub, port1, udev, HUB_ROOT_RESET_TIME, false);
> +	if (retval < 0)
> +		hub_port_disable(hub, port1, 0);
> +
>  	if (udev->persist_enabled)
>  		status = wait_for_connected(udev, hub, &port1, &portchange,
>  				&portstatus);