3 files changed, 43 insertions, 0 deletions
diff --git a/drivers/platform/x86/asus-nb-wmi.c b/drivers/platform/x86/asus-nb-wmi.c
index 26e4cbc34db8..3ac4f48895dd 100644
--- a/drivers/platform/x86/asus-nb-wmi.c
+++ b/drivers/platform/x86/asus-nb-wmi.c
@@ -116,6 +116,10 @@ static struct quirk_entry quirk_asus_ux303ub = {
 	.wmi_backlight_native = true,
 };
 
+static struct quirk_entry quirk_asus_x550lb = {
+	.xusb2pr = 0x01D9,
+};
+
 static int dmi_matched(const struct dmi_system_id *dmi)
 {
 	quirks = dmi->driver_data;
@@ -398,6 +402,15 @@ static const struct dmi_system_id asus_quirks[] = {
 		},
 		.driver_data = &quirk_asus_ux303ub,
 	},
+	{
+		.callback = dmi_matched,
+		.ident = "ASUSTeK COMPUTER INC. X550LB",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "X550LB"),
+		},
+		.driver_data = &quirk_asus_x550lb,
+	},
 	{},
 };
 
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index ce6ca31a2d09..43cb680adbb4 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -156,6 +156,9 @@ MODULE_LICENSE("GPL");
 #define ASUS_FAN_CTRL_MANUAL		1
 #define ASUS_FAN_CTRL_AUTO		2
 
+#define USB_INTEL_XUSB2PR		0xD0
+#define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI	0x9c31
+
 struct bios_args {
 	u32 arg0;
 	u32 arg1;
@@ -1080,6 +1083,29 @@ exit:
 	return result;
 }
 
+static void asus_wmi_set_xusb2pr(struct asus_wmi *asus)
+{
+	struct pci_dev *xhci_pdev;
+	u32 orig_ports_available;
+	u32 ports_available = asus->driver->quirks->xusb2pr;
+
+	xhci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
+			PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI,
+			NULL);
+
+	if (!xhci_pdev)
+		return;
+
+	pci_read_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
+				&orig_ports_available);
+
+	pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
+				cpu_to_le32(ports_available));
+
+	pr_info("set USB_INTEL_XUSB2PR old: 0x%04x, new: 0x%04x\n",
+			orig_ports_available, ports_available);
+}
+
 /*
  * Hwmon device
  */
@@ -2087,6 +2113,9 @@ static int asus_wmi_add(struct platform_device *pdev)
 	if (asus->driver->quirks->wmi_backlight_native)
 		acpi_video_set_dmi_backlight_type(acpi_backlight_native);
 
+	if (asus->driver->quirks->xusb2pr)
+		asus_wmi_set_xusb2pr(asus);
+
 	if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
 		err = asus_wmi_backlight_init(asus);
 		if (err && err != -ENODEV)
diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
index 0e19014e9f54..fdff626c3b51 100644
--- a/drivers/platform/x86/asus-wmi.h
+++ b/drivers/platform/x86/asus-wmi.h
@@ -53,6 +53,7 @@ struct quirk_entry {
 	 * and let the ACPI interrupt to send out the key event.
 	 */
 	int no_display_toggle;
+	u32 xusb2pr;
 
 	bool (*i8042_filter)(unsigned char data, unsigned char str,
 			     struct serio *serio);