diff options
| author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2010-07-29 22:13:22 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-10 14:35:45 -0700 |
| commit | 006d5820b41b298328e6b6085e4d58129fbc78f0 (patch) | |
| tree | 553c36401c2442ac8f08311a9a7e2bdf2e0d5edb | |
| parent | ed3f24539209826235debaec66ca0da708b5bb89 (diff) | |
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>
| -rw-r--r-- | drivers/usb/host/xhci-pci.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c index 11482b6b938..f7efe025bed 100644 --- 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); |