This is a note to let you know that I've just added the patch titled
xhci: resume USB 3 roothub first
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xhci-resume-usb-3-roothub-first.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 671ffdff5b13314b1fc65d62cf7604b873fb5dc4 Mon Sep 17 00:00:00 2001
From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Date: Fri, 8 Apr 2016 16:25:06 +0300
Subject: xhci: resume USB 3 roothub first
From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
commit 671ffdff5b13314b1fc65d62cf7604b873fb5dc4 upstream.
Give USB3 devices a better chance to enumerate at USB 3 speeds if
they are connected to a suspended host.
Solves an issue with NEC uPD720200 host hanging when partially
enumerating a USB3 device as USB2 after host controller runtime resume.
Tested-by: Mike Murdoch <main.haarp@xxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1103,8 +1103,8 @@ int xhci_resume(struct xhci_hcd *xhci, b
/* Resume root hubs only when have pending events. */
status = readl(&xhci->op_regs->status);
if (status & STS_EINT) {
- usb_hcd_resume_root_hub(hcd);
usb_hcd_resume_root_hub(xhci->shared_hcd);
+ usb_hcd_resume_root_hub(hcd);
}
}
@@ -1119,10 +1119,10 @@ int xhci_resume(struct xhci_hcd *xhci, b
/* Re-enable port polling. */
xhci_dbg(xhci, "%s: starting port polling.\n", __func__);
- set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
- usb_hcd_poll_rh_status(hcd);
set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
usb_hcd_poll_rh_status(xhci->shared_hcd);
+ set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+ usb_hcd_poll_rh_status(hcd);
return retval;
}
Patches currently in stable-queue which might be from mathias.nyman@xxxxxxxxxxxxxxx are
queue-4.4/usb-xhci-applying-xhci_pme_stuck_quirk-to-intel-bxt-b0-host.patch
queue-4.4/xhci-resume-usb-3-roothub-first.patch
queue-4.4/xhci-fix-10-second-timeout-on-removal-of-pci-hotpluggable-xhci-controllers.patch
queue-4.4/usb-xhci-fix-wild-pointers-in-xhci_mem_cleanup.patch
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