From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: linux-usb@vger.kernel.org, Anshuman Gupta <anshuman.gupta@intel.com>
Subject: [2/3] xhci: Avoid USB autosuspend when resuming USB2 ports.
Date: Fri, 14 Sep 2018 15:00:40 +0200 [thread overview]
Message-ID: <20180914130040.GA3555@kroah.com> (raw)
On Fri, Sep 14, 2018 at 03:33:30PM +0300, Mathias Nyman wrote:
> From: Anshuman Gupta <anshuman.gupta@intel.com>
>
> When USB bus host controller root hub resumes from autosuspend,
> it immediately tries to enter auto-suspend, but there can be a
> scenario when root hub is resuming its usb2 ports, in that particular
> case USB host controller auto suspend fails since it is busy
> to resuming its usb2 ports.
>
> This makes multiple failed cycles of auto-suspend until all usb2
> ports of host controller root hub do not resume.
>
> This patch uses USB core framework usb_hcd_start_port_resume,
> usb_hcd_end_port_resume API's in order to autoresume/autosuspend
> root hub properly.
>
> Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Not needed in stable? Does this fix a specific commit?
thanks,
greg k-h
next reply other threads:[~2018-09-14 13:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-14 13:00 Greg Kroah-Hartman [this message]
-- strict thread matches above, loose matches on Subject: below --
2018-09-20 10:35 [2/3] xhci: Avoid USB autosuspend when resuming USB2 ports Greg Kroah-Hartman
2018-09-19 5:24 Anshuman Gupta
2018-09-17 8:24 Mathias Nyman
2018-09-14 12:33 Mathias Nyman
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