From: Joe Lee <asmt.sw...@gmail.com>

For AMD Promontory xHCI host, although you can disable USB 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.

[commit and code comment rephrasing -Mathias]
Signed-off-by: Joe Lee <asmt.sw...@gmail.com>
Signed-off-by: Mathias Nyman <mathias.ny...@linux.intel.com>
---
 drivers/usb/host/pci-quirks.c | 109 ++++++++++++++++++++++++++++++++++++++++++
 drivers/usb/host/pci-quirks.h |   5 ++
 drivers/usb/host/xhci-hub.c   |   7 +++
 drivers/usb/host/xhci-pci.c   |  11 +++++
 drivers/usb/host/xhci.h       |   2 +-
 5 files changed, 133 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 1615367..67ad4bb 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -66,6 +66,23 @@
 #define        AX_INDXC                0x30
 #define        AX_DATAC                0x34
 
+#define PT_ADDR_INDX           0xE8
+#define PT_READ_INDX           0xE4
+#define PT_SIG_1_ADDR          0xA520
+#define PT_SIG_2_ADDR          0xA521
+#define PT_SIG_3_ADDR          0xA522
+#define PT_SIG_4_ADDR          0xA523
+#define PT_SIG_1_DATA          0x78
+#define PT_SIG_2_DATA          0x56
+#define PT_SIG_3_DATA          0x34
+#define PT_SIG_4_DATA          0x12
+#define PT4_P1_REG             0xB521
+#define PT4_P2_REG             0xB522
+#define PT2_P1_REG             0xD520
+#define PT2_P2_REG             0xD521
+#define PT1_P1_REG             0xD522
+#define PT1_P2_REG             0xD523
+
 #define        NB_PCIE_INDX_ADDR       0xe0
 #define        NB_PCIE_INDX_DATA       0xe4
 #define        PCIE_P_CNTL             0x10040
@@ -513,6 +530,98 @@ void usb_amd_dev_put(void)
 EXPORT_SYMBOL_GPL(usb_amd_dev_put);
 
 /*
+ * Check if port is disabled in BIOS on AMD Promontory host.
+ * BIOS Disabled ports may wake on connect/disconnect and need
+ * driver workaround to keep them disabled.
+ * Returns true if port is marked disabled.
+ */
+bool usb_amd_pt_check_port(struct device *device, int port)
+{
+       unsigned char value, port_shift;
+       struct pci_dev *pdev;
+       u16 reg;
+
+       pdev = to_pci_dev(device);
+       pci_write_config_word(pdev, PT_ADDR_INDX, PT_SIG_1_ADDR);
+
+       pci_read_config_byte(pdev, PT_READ_INDX, &value);
+       if (value != PT_SIG_1_DATA)
+               return false;
+
+       pci_write_config_word(pdev, PT_ADDR_INDX, PT_SIG_2_ADDR);
+
+       pci_read_config_byte(pdev, PT_READ_INDX, &value);
+       if (value != PT_SIG_2_DATA)
+               return false;
+
+       pci_write_config_word(pdev, PT_ADDR_INDX, PT_SIG_3_ADDR);
+
+       pci_read_config_byte(pdev, PT_READ_INDX, &value);
+       if (value != PT_SIG_3_DATA)
+               return false;
+
+       pci_write_config_word(pdev, PT_ADDR_INDX, PT_SIG_4_ADDR);
+
+       pci_read_config_byte(pdev, PT_READ_INDX, &value);
+       if (value != PT_SIG_4_DATA)
+               return false;
+
+       /* Check disabled port setting, if bit is set port is enabled */
+       switch (pdev->device) {
+       case 0x43b9:
+       case 0x43ba:
+       /*
+        * device is AMD_PROMONTORYA_4(0x43b9) or PROMONTORYA_3(0x43ba)
+        * PT4_P1_REG bits[7..1] represents USB2.0 ports 6 to 0
+        * PT4_P2_REG bits[6..0] represents ports 13 to 7
+        */
+               if (port > 6) {
+                       reg = PT4_P2_REG;
+                       port_shift = port - 7;
+               } else {
+                       reg = PT4_P1_REG;
+                       port_shift = port + 1;
+               }
+               break;
+       case 0x43bb:
+       /*
+        * device is AMD_PROMONTORYA_2(0x43bb)
+        * PT2_P1_REG bits[7..5] represents USB2.0 ports 2 to 0
+        * PT2_P2_REG bits[5..0] represents ports 9 to 3
+        */
+               if (port > 2) {
+                       reg = PT2_P2_REG;
+                       port_shift = port - 3;
+               } else {
+                       reg = PT2_P1_REG;
+                       port_shift = port + 5;
+               }
+               break;
+       case 0x43bc:
+       /*
+        * device is AMD_PROMONTORYA_1(0x43bc)
+        * PT1_P1_REG[7..4] represents USB2.0 ports 3 to 0
+        * PT1_P2_REG[5..0] represents ports 9 to 4
+        */
+               if (port > 3) {
+                       reg = PT1_P2_REG;
+                       port_shift = port - 4;
+               } else {
+                       reg = PT1_P1_REG;
+                       port_shift = port + 4;
+               }
+               break;
+       default:
+               return false;
+       }
+       pci_write_config_word(pdev, PT_ADDR_INDX, reg);
+       pci_read_config_byte(pdev, PT_READ_INDX, &value);
+
+       return !(value & BIT(port_shift));
+}
+EXPORT_SYMBOL_GPL(usb_amd_pt_check_port);
+
+/*
  * Make sure the controller is completely inactive, unable to
  * generate interrupts or do DMA.
  */
diff --git a/drivers/usb/host/pci-quirks.h b/drivers/usb/host/pci-quirks.h
index b68dcb5..4ca0d9b 100644
--- a/drivers/usb/host/pci-quirks.h
+++ b/drivers/usb/host/pci-quirks.h
@@ -17,6 +17,7 @@ void usb_enable_intel_xhci_ports(struct pci_dev *xhci_pdev);
 void usb_disable_xhci_ports(struct pci_dev *xhci_pdev);
 void sb800_prefetch(struct device *dev, int on);
 bool usb_xhci_needs_pci_reset(struct pci_dev *pdev);
+bool usb_amd_pt_check_port(struct device *device, int port);
 #else
 struct pci_dev;
 static inline void usb_amd_quirk_pll_disable(void) {}
@@ -25,6 +26,10 @@ static inline void usb_asmedia_modifyflowcontrol(struct 
pci_dev *pdev) {}
 static inline void usb_amd_dev_put(void) {}
 static inline void usb_disable_xhci_ports(struct pci_dev *xhci_pdev) {}
 static inline void sb800_prefetch(struct device *dev, int on) {}
+static inline bool usb_amd_pt_check_port(struct device *device, int port)
+{
+       return false;
+}
 #endif  /* CONFIG_USB_PCI */
 
 #endif  /*  __LINUX_USB_PCI_QUIRKS_H  */
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 46d5e08..1df0c36 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -1522,6 +1522,13 @@ 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)) {
+                               if (usb_amd_pt_check_port(hcd->self.controller,
+                                                         port_index))
+                                       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 6c79037..5262fa5 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -42,6 +42,10 @@
 #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
 #define PCI_DEVICE_ID_ASMEDIA_1042A_XHCI               0x1142
 
 static const char hcd_name[] = "xhci_hcd";
@@ -125,6 +129,13 @@ 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 96099a2..e4d7d3d 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1822,7 +1822,7 @@ 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)
-/* Reserved. It was XHCI_U2_DISABLE_WAKE */
+#define XHCI_U2_DISABLE_WAKE   (1 << 27)
 #define XHCI_ASMEDIA_MODIFY_FLOWCONTROL        (1 << 28)
 #define XHCI_HW_LPM_DISABLE    (1 << 29)
 
-- 
2.7.4

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