[v2 PATCH] usb: gadget: bdc: use readl_poll_timeout() to simplify code

[Chunfeng Yun]

Use readl_poll_timeout() to poll register status

Cc: Florian Fainelli <f.faine...@gmail.com>
Signed-off-by: Chunfeng Yun <chunfeng....@mediatek.com>
---
v2 changes, suggested by Stephen:
  1. use unsigned int instead of int for @usec parameter
  2. add dev_log() back
  3. drop "Err" in error log
---
 drivers/usb/gadget/udc/bdc/bdc_core.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c 
b/drivers/usb/gadget/udc/bdc/bdc_core.c
index 02a3a77..53dccb1 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_core.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_core.c
@@ -12,6 +12,7 @@
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
+#include <linux/iopoll.h>
 #include <linux/ioport.h>
 #include <linux/io.h>
 #include <linux/list.h>
@@ -29,24 +30,19 @@
 #include "bdc_dbg.h"
 
 /* Poll till controller status is not OIP */
-static int poll_oip(struct bdc *bdc, int usec)
+static int poll_oip(struct bdc *bdc, u32 usec)
 {
        u32 status;
-       /* Poll till STS!= OIP */
-       while (usec) {
-               status = bdc_readl(bdc->regs, BDC_BDCSC);
-               if (BDC_CSTS(status) != BDC_OIP) {
-                       dev_dbg(bdc->dev,
-                               "poll_oip complete status=%d",
-                               BDC_CSTS(status));
-                       return 0;
-               }
-               udelay(10);
-               usec -= 10;
-       }
-       dev_err(bdc->dev, "Err: operation timedout BDCSC: 0x%08x\n", status);
+       int ret;
 
-       return -ETIMEDOUT;
+       ret = readl_poll_timeout(bdc->regs + BDC_BDCSC, status,
+               (BDC_CSTS(status) != BDC_OIP), 10, usec);
+       if (ret)
+               dev_err(bdc->dev, "operation timedout BDCSC: 0x%08x\n", status);
+       else
+               dev_dbg(bdc->dev, "%s complete status=%d", __func__, 
BDC_CSTS(status));
+
+       return ret;
 }
 
 /* Stop the BDC controller */
-- 
1.9.1