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path: root/drivers/usb/host/xhci.c
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Diffstat (limited to 'drivers/usb/host/xhci.c')
-rw-r--r--drivers/usb/host/xhci.c24
1 files changed, 11 insertions, 13 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index a9bb796794e3..20db378a6012 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -9,6 +9,7 @@
*/
#include <linux/pci.h>
+#include <linux/iopoll.h>
#include <linux/irq.h>
#include <linux/log2.h>
#include <linux/module.h>
@@ -52,7 +53,6 @@ static bool td_on_ring(struct xhci_td *td, struct xhci_ring *ring)
return false;
}
-/* TODO: copied from ehci-hcd.c - can this be refactored? */
/*
* xhci_handshake - spin reading hc until handshake completes or fails
* @ptr: address of hc register to be read
@@ -69,18 +69,16 @@ static bool td_on_ring(struct xhci_td *td, struct xhci_ring *ring)
int xhci_handshake(void __iomem *ptr, u32 mask, u32 done, int usec)
{
u32 result;
+ int ret;
- do {
- result = readl(ptr);
- if (result == ~(u32)0) /* card removed */
- return -ENODEV;
- result &= mask;
- if (result == done)
- return 0;
- udelay(1);
- usec--;
- } while (usec > 0);
- return -ETIMEDOUT;
+ ret = readl_poll_timeout_atomic(ptr, result,
+ (result & mask) == done ||
+ result == U32_MAX,
+ 1, usec);
+ if (result == U32_MAX) /* card removed */
+ return -ENODEV;
+
+ return ret;
}
/*
@@ -4320,7 +4318,6 @@ static int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd,
pm_addr = ports[port_num]->addr + PORTPMSC;
pm_val = readl(pm_addr);
hlpm_addr = ports[port_num]->addr + PORTHLPMC;
- field = le32_to_cpu(udev->bos->ext_cap->bmAttributes);
xhci_dbg(xhci, "%s port %d USB2 hardware LPM\n",
enable ? "enable" : "disable", port_num + 1);
@@ -4332,6 +4329,7 @@ static int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd,
* default one which works with mixed HIRD and BESL
* systems. See XHCI_DEFAULT_BESL definition in xhci.h
*/
+ field = le32_to_cpu(udev->bos->ext_cap->bmAttributes);
if ((field & USB_BESL_SUPPORT) &&
(field & USB_BESL_BASELINE_VALID))
hird = USB_GET_BESL_BASELINE(field);