Use readx_poll_sleep_timeout() to poll the register status
Change-Id: If05a68baf52c54ab30029279e349be6076f1d0ca
Signed-off-by: Chunfeng Yun <chunfeng....@mediatek.com>
---
v2: fix typo of title suggested by Frank
---
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
