[PATCH 11/11] usb: xhci: convet to readx_poll_sleep_timeout()

[Chunfeng Yun]

Use readx_poll_sleep_timeout() to poll the register status

Signed-off-by: Chunfeng Yun <chunfeng....@mediatek.com>
---
 drivers/usb/host/xhci.c | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index fe30101..3547a9b 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -33,6 +33,7 @@
 #include <linux/bug.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
+#include <linux/iopoll.h>
 #include <usb/xhci.h>
 
 #ifndef CONFIG_USB_MAX_CONTROLLER_COUNT
@@ -143,23 +144,19 @@ struct xhci_ctrl *xhci_get_ctrl(struct usb_device *udev)
  * @param usec time to wait till
  * @return 0 if handshake is success else < 0 on failure
  */
-static int handshake(uint32_t volatile *ptr, uint32_t mask,
-                                       uint32_t done, int usec)
+static int
+handshake(uint32_t volatile *ptr, uint32_t mask, uint32_t done, int usec)
 {
        uint32_t result;
+       int ret;
+
+       ret = readx_poll_sleep_timeout(xhci_readl, ptr, result,
+                                (result & mask) == done || result == U32_MAX,
+                                1, usec);
+       if (result == U32_MAX)          /* card removed */
+               return -ENODEV;
 
-       do {
-               result = xhci_readl(ptr);
-               if (result == ~(uint32_t)0)
-                       return -ENODEV;
-               result &= mask;
-               if (result == done)
-                       return 0;
-               usec--;
-               udelay(1);
-       } while (usec > 0);
-
-       return -ETIMEDOUT;
+       return ret;
 }
 
 /**
-- 
1.9.1