USB: xhci: Set DMA mask for host.

Tell the USB core that we can do DMA directly (instead of needing it to
memory-map the buffers for PIO).  If the xHCI host supports 64-bit addresses,
set the DMA mask accordingly.  Otherwise indicate the host can handle 32-bit DMA
addresses.

This improves performance because the USB core doesn't have to spend time
remapping buffers in high memory into the 32-bit address range.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 11482b6..f7efe02 100644 (file)
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -53,6 +53,7 @@ static int xhci_pci_setup(struct usb_hcd *hcd)
        struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
        struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
        int                     retval;
+       u32                     temp;
 
        hcd->self.sg_tablesize = TRBS_PER_SEGMENT - 2;
 
@@ -93,6 +94,14 @@ static int xhci_pci_setup(struct usb_hcd *hcd)
                return retval;
        xhci_dbg(xhci, "Reset complete\n");
 
+       temp = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
+       if (HCC_64BIT_ADDR(temp)) {
+               xhci_dbg(xhci, "Enabling 64-bit DMA addresses.\n");
+               dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64));
+       } else {
+               dma_set_mask(hcd->self.controller, DMA_BIT_MASK(32));
+       }
+
        xhci_dbg(xhci, "Calling HCD init\n");
        /* Initialize HCD and host controller data structures. */
        retval = xhci_init(hcd);