This is a note to let you know that I've just added the patch titled
usb: host: xhci: fix compliance mode workaround
to the 3.10-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:
usb-host-xhci-fix-compliance-mode-workaround.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 96908589a8b2584b1185f834d365f5cc360e8226 Mon Sep 17 00:00:00 2001
From: Felipe Balbi <balbi@xxxxxx>
Date: Wed, 27 Aug 2014 16:38:04 -0500
Subject: usb: host: xhci: fix compliance mode workaround
From: Felipe Balbi <balbi@xxxxxx>
commit 96908589a8b2584b1185f834d365f5cc360e8226 upstream.
Commit 71c731a (usb: host: xhci: Fix Compliance Mode
on SN65LVP3502CP Hardware) implemented a workaround
for a known issue with Texas Instruments' USB 3.0
redriver IC but it left a condition where any xHCI
host would be taken out of reset if port was placed
in compliance mode and there was no device connected
to the port.
That condition would trigger a fake connection to a
non-existent device so that usbcore would trigger a
warm reset of the port, thus taking the link out of
reset.
This has the side-effect of preventing any xHCI host
connected to a Linux machine from starting and running
the USB 3.0 Electrical Compliance Suite because the
port will mysteriously taken out of compliance mode
and, thus, xHCI won't step through the necessary
compliance patterns for link validation.
This patch fixes the issue by just adding a missing
check for XHCI_COMP_MODE_QUIRK inside
xhci_hub_report_usb3_link_state() when PORT_CAS isn't
set.
This patch should be backported to all kernels containing
commit 71c731a.
Fixes: 71c731a (usb: host: xhci: Fix Compliance Mode on SN65LVP3502CP Hardware)
Cc: Alexis R. Cortes <alexis.cortes@xxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v3.2+
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Acked-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-hub.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -462,7 +462,8 @@ void xhci_test_and_clear_bit(struct xhci
}
/* Updates Link Status for super Speed port */
-static void xhci_hub_report_link_state(u32 *status, u32 status_reg)
+static void xhci_hub_report_link_state(struct xhci_hcd *xhci,
+ u32 *status, u32 status_reg)
{
u32 pls = status_reg & PORT_PLS_MASK;
@@ -501,7 +502,8 @@ static void xhci_hub_report_link_state(u
* in which sometimes the port enters compliance mode
* caused by a delay on the host-device negotiation.
*/
- if (pls == USB_SS_PORT_LS_COMP_MOD)
+ if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
+ (pls == USB_SS_PORT_LS_COMP_MOD))
pls |= USB_PORT_STAT_CONNECTION;
}
@@ -686,7 +688,7 @@ int xhci_hub_control(struct usb_hcd *hcd
}
/* Update Port Link State for super speed ports*/
if (hcd->speed == HCD_USB3) {
- xhci_hub_report_link_state(&status, temp);
+ xhci_hub_report_link_state(xhci, &status, temp);
/*
* Verify if all USB3 Ports Have entered U0 already.
* Delete Compliance Mode Timer if so.
Patches currently in stable-queue which might be from balbi@xxxxxx are
queue-3.10/usb-dwc3-omap-fix-ordering-for-runtime-pm-calls.patch
queue-3.10/usb-host-xhci-fix-compliance-mode-workaround.patch
queue-3.10/usb-dwc3-core-fix-ordering-for-phy-suspend.patch
queue-3.10/usb-dwc3-core-fix-order-of-pm-runtime-calls.patch
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