USB/xhci: Enable remote wakeup for USB3 devices.

[firefly-linux-kernel-4.4.55.git] / drivers / usb / host / xhci-mem.c

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 36cbe2226a44e46b3acd6c8269ede7ab57fc03ad..6b70e7fb484c4c4ce33aace27b842f73dc097eab 100644 (file)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2141,7 +2141,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
        unsigned int    val, val2;
        u64             val_64;
        struct xhci_segment     *seg;
-       u32 page_size;
+       u32 page_size, temp;
        int i;
 
        page_size = xhci_readl(xhci, &xhci->op_regs->page_size);
@@ -2324,6 +2324,15 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 
        INIT_LIST_HEAD(&xhci->lpm_failed_devs);
 
+       /* Enable USB 3.0 device notifications for function remote wake, which
+        * is necessary for allowing USB 3.0 devices to do remote wakeup from
+        * U3 (device suspend).
+        */
+       temp = xhci_readl(xhci, &xhci->op_regs->dev_notification);
+       temp &= ~DEV_NOTE_MASK;
+       temp |= DEV_NOTE_FWAKE;
+       xhci_writel(xhci, temp, &xhci->op_regs->dev_notification);
+
        return 0;
 
 fail: