[PATCH 1/2 v2] xhci: provide usb_disable_xhci_ports function for Intel chipsets.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Some devices with Intel Panther Point chipset may require switchover
usb ports from XHCI back to EHCI controller before shutdown.
Otherwise various BIOS bugs related to power management may be
triggered.

v2: deleted unnecessary variables.

Signed-off-by: Denis Turischev <denis@xxxxxxxxxxxxxx>
---
 drivers/usb/host/pci-quirks.c |    7 +++++++
 drivers/usb/host/pci-quirks.h |    1 +
 2 files changed, 8 insertions(+)

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index df0828c..c5e9e4a 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -800,6 +800,13 @@ void usb_enable_xhci_ports(struct pci_dev *xhci_pdev)
 }
 EXPORT_SYMBOL_GPL(usb_enable_xhci_ports);

+void usb_disable_xhci_ports(struct pci_dev *xhci_pdev)
+{
+	pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN, 0x0);
+	pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR, 0x0);
+}
+EXPORT_SYMBOL_GPL(usb_disable_xhci_ports);
+
 /**
  * PCI Quirks for xHCI.
  *
diff --git a/drivers/usb/host/pci-quirks.h b/drivers/usb/host/pci-quirks.h
index b1002a8..ef004a5 100644
--- a/drivers/usb/host/pci-quirks.h
+++ b/drivers/usb/host/pci-quirks.h
@@ -10,6 +10,7 @@ void usb_amd_quirk_pll_disable(void);
 void usb_amd_quirk_pll_enable(void);
 bool usb_is_intel_switchable_xhci(struct pci_dev *pdev);
 void usb_enable_xhci_ports(struct pci_dev *xhci_pdev);
+void usb_disable_xhci_ports(struct pci_dev *xhci_pdev);
 #else
 static inline void usb_amd_quirk_pll_disable(void) {}
 static inline void usb_amd_quirk_pll_enable(void) {}
-- 
1.7.9.5


--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux