Patch "usb: xhci: handle both SSIC ports in PME stuck quirk" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    usb: xhci: handle both SSIC ports in PME stuck quirk

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:
     usb-xhci-handle-both-ssic-ports-in-pme-stuck-quirk.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@vger.kernel.org> know about it.


>From fa89537783cb442263fa5a14df6c7693eaf32f11 Mon Sep 17 00:00:00 2001
From: Lu Baolu <baolu.lu@linux.intel.com>
Date: Tue, 26 Jan 2016 17:50:05 +0200
Subject: usb: xhci: handle both SSIC ports in PME stuck quirk

From: Lu Baolu <baolu.lu@linux.intel.com>

commit fa89537783cb442263fa5a14df6c7693eaf32f11 upstream.

Commit abce329c27b3 ("xhci: Workaround to get D3 working in Intel xHCI")
adds a workaround for a limitation of PME storm caused by SSIC port in
some Intel SoCs. This commit only handled one SSIC port, while there
are actually two SSIC ports in the chips. This patch handles both SSIC
ports. Without this fix, users still see PME storm.

Signed-off-by: Zhuang Jin Can <jin.can.zhuang@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/host/xhci-pci.c |   48 ++++++++++++++++++++++++++------------------
 1 file changed, 29 insertions(+), 19 deletions(-)

--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -28,7 +28,9 @@
 #include "xhci.h"
 #include "xhci-trace.h"
 
-#define PORT2_SSIC_CONFIG_REG2	0x883c
+#define SSIC_PORT_NUM		2
+#define SSIC_PORT_CFG2		0x880c
+#define SSIC_PORT_CFG2_OFFSET	0x30
 #define PROG_DONE		(1 << 30)
 #define SSIC_PORT_UNUSED	(1 << 31)
 
@@ -322,28 +324,36 @@ static void xhci_pme_quirk(struct usb_hc
 	struct pci_dev		*pdev = to_pci_dev(hcd->self.controller);
 	u32 val;
 	void __iomem *reg;
+	int i;
 
 	if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 		 pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI) {
 
-		reg = (void __iomem *) xhci->cap_regs + PORT2_SSIC_CONFIG_REG2;
-
-		/* Notify SSIC that SSIC profile programming is not done */
-		val = readl(reg) & ~PROG_DONE;
-		writel(val, reg);
-
-		/* Mark SSIC port as unused(suspend) or used(resume) */
-		val = readl(reg);
-		if (suspend)
-			val |= SSIC_PORT_UNUSED;
-		else
-			val &= ~SSIC_PORT_UNUSED;
-		writel(val, reg);
-
-		/* Notify SSIC that SSIC profile programming is done */
-		val = readl(reg) | PROG_DONE;
-		writel(val, reg);
-		readl(reg);
+		for (i = 0; i < SSIC_PORT_NUM; i++) {
+			reg = (void __iomem *) xhci->cap_regs +
+					SSIC_PORT_CFG2 +
+					i * SSIC_PORT_CFG2_OFFSET;
+
+			/*
+			 * Notify SSIC that SSIC profile programming
+			 * is not done.
+			 */
+			val = readl(reg) & ~PROG_DONE;
+			writel(val, reg);
+
+			/* Mark SSIC port as unused(suspend) or used(resume) */
+			val = readl(reg);
+			if (suspend)
+				val |= SSIC_PORT_UNUSED;
+			else
+				val &= ~SSIC_PORT_UNUSED;
+			writel(val, reg);
+
+			/* Notify SSIC that SSIC profile programming is done */
+			val = readl(reg) | PROG_DONE;
+			writel(val, reg);
+			readl(reg);
+		}
 	}
 
 	reg = (void __iomem *) xhci->cap_regs + 0x80a4;


Patches currently in stable-queue which might be from baolu.lu@linux.intel.com are

queue-4.4/usb-xhci-handle-both-ssic-ports-in-pme-stuck-quirk.patch
queue-4.4/usb-cdc-acm-send-zero-packet-for-intel-7260-modem.patch
queue-4.4/usb-xhci-apply-xhci_pme_stuck_quirk-to-intel-broxton-m-platforms.patch
queue-4.4/usb-cdc-acm-handle-unlinked-urb-in-acm-read-callback.patch