[PATCH RESEND v3 07/11] usb: isp1760-hcd: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Signed-off-by: Chunfeng Yun <chunfeng....@mediatek.com>
---
v2~v3: no changes
---
 drivers/usb/isp1760/isp1760-hcd.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/isp1760/isp1760-hcd.c 
b/drivers/usb/isp1760/isp1760-hcd.c
index dd74ab7a..33ae656 100644
--- a/drivers/usb/isp1760/isp1760-hcd.c
+++ b/drivers/usb/isp1760/isp1760-hcd.c
@@ -22,6 +22,7 @@
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/mm.h>
 #include <linux/timer.h>
 #include <asm/unaligned.h>
@@ -380,18 +381,15 @@ static int handshake(struct usb_hcd *hcd, u32 reg,
                      u32 mask, u32 done, int usec)
 {
        u32 result;
+       int ret;
+
+       ret = readl_poll_timeout_atomic(hcd->regs + reg, result,
+                                       ((result & mask) == done ||
+                                        result == U32_MAX), 1, usec);
+       if (result == U32_MAX)
+               return -ENODEV;
 
-       do {
-               result = reg_read32(hcd->regs, reg);
-               if (result == ~0)
-                       return -ENODEV;
-               result &= mask;
-               if (result == done)
-                       return 0;
-               udelay(1);
-               usec--;
-       } while (usec > 0);
-       return -ETIMEDOUT;
+       return ret;
 }
 
 /* reset a non-running (STS_HALT == 1) controller */
-- 
1.9.1