xhci: Limit USB2 port wake support for AMD Promontory hosts

For AMD Promontory xHCI host, although you can disable USB 2.0 ports in
BIOS settings, those ports will be enabled anyway after you remove a
device on that port and re-plug it in again. It's a known limitation of
the chip. As a workaround we can clear the PORT_WAKE_BITS.

This will disable wake on connect, disconnect and overcurrent on
AMD Promontory USB2 ports

[checkpatch cleanup and commit message reword -Mathias]
Cc: <stable@vger.kernel.org>
Cc: Tsai Nicholas <nicholas.tsai@amd.com>
Signed-off-by: Jiahau Chang <Lars_Chang@asmedia.com.tw>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 0dde49c..1adae9e 100644 (file)
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -1461,6 +1461,9 @@ int xhci_bus_suspend(struct usb_hcd *hcd)
                                t2 |= PORT_WKOC_E | PORT_WKCONN_E;
                                t2 &= ~PORT_WKDISC_E;
                        }
+                       if ((xhci->quirks & XHCI_U2_DISABLE_WAKE) &&
+                           (hcd->speed < HCD_USB3))
+                               t2 &= ~PORT_WAKE_BITS;
                } else
                        t2 &= ~PORT_WAKE_BITS;
 

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 1bcf971..0965bae 100644 (file)
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -54,6 +54,11 @@
 #define PCI_DEVICE_ID_INTEL_APL_XHCI                   0x5aa8
 #define PCI_DEVICE_ID_INTEL_DNV_XHCI                   0x19d0
 
+#define PCI_DEVICE_ID_AMD_PROMONTORYA_4                        0x43b9
+#define PCI_DEVICE_ID_AMD_PROMONTORYA_3                        0x43ba
+#define PCI_DEVICE_ID_AMD_PROMONTORYA_2                        0x43bb
+#define PCI_DEVICE_ID_AMD_PROMONTORYA_1                        0x43bc
+
 static const char hcd_name[] = "xhci_hcd";
 
 static struct hc_driver __read_mostly xhci_pci_hc_driver;
@@ -135,6 +140,13 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
        if (pdev->vendor == PCI_VENDOR_ID_AMD)
                xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 
+       if ((pdev->vendor == PCI_VENDOR_ID_AMD) &&
+               ((pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_4) ||
+               (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_3) ||
+               (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_2) ||
+               (pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_1)))
+               xhci->quirks |= XHCI_U2_DISABLE_WAKE;
+
        if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
                xhci->quirks |= XHCI_LPM_SUPPORT;
                xhci->quirks |= XHCI_INTEL_HOST;

diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 73a28a9..dcd9649 100644 (file)
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1819,6 +1819,7 @@ struct xhci_hcd {
 /* For controller with a broken Port Disable implementation */
 #define XHCI_BROKEN_PORT_PED   (1 << 25)
 #define XHCI_LIMIT_ENDPOINT_INTERVAL_7 (1 << 26)
+#define XHCI_U2_DISABLE_WAKE   (1 << 27)
 
        unsigned int            num_active_eps;
        unsigned int            limit_active_eps;