[PATCH 10/10] usb: udc: net2280: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Cc: Alan Stern <st...@rowland.harvard.edu>
Cc: Felipe Balbi <ba...@kernel.org>
Signed-off-by: Chunfeng Yun <chunfeng....@mediatek.com>
---
 drivers/usb/gadget/udc/net2280.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
index 7530bd9..f1a21f4 100644
--- a/drivers/usb/gadget/udc/net2280.c
+++ b/drivers/usb/gadget/udc/net2280.c
@@ -52,6 +52,7 @@
 #include <linux/usb/gadget.h>
 #include <linux/prefetch.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 
 #include <asm/byteorder.h>
 #include <asm/irq.h>
@@ -360,18 +361,16 @@ static inline void enable_pciirqenb(struct net2280_ep *ep)
 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
 {
        u32     result;
+       int     ret;
 
-       do {
-               result = readl(ptr);
-               if (result == ~(u32)0)          /* "device unplugged" */
-                       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)          /* device unplugged */
+               return -ENODEV;
+
+       return ret;
 }
 
 static const struct usb_ep_ops net2280_ep_ops;
-- 
1.9.1