[PATCH v4 03/11] usb: pci-quirks: convert to readl_poll_timeout_atomic()

[Chunfeng Yun]

Use readl_poll_timeout_atomic() to simplify code

Cc: Mathias Nyman <mathias.nyman at linux.intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun at mediatek.com>
---
v2~v4: no changes
---
 drivers/usb/host/pci-quirks.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index b8961c0..8920566 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -16,6 +16,7 @@
 #include <linux/export.h>
 #include <linux/acpi.h>
 #include <linux/dmi.h>
+#include <linux/iopoll.h>
 
 #include <soc/bcm2835/raspberrypi-firmware.h>
 
@@ -1012,15 +1013,9 @@ static int handshake(void __iomem *ptr, u32 mask, u32 done,
 {
 	u32	result;
 
-	do {
-		result = readl(ptr);
-		result &= mask;
-		if (result == done)
-			return 0;
-		udelay(delay_usec);
-		wait_usec -= delay_usec;
-	} while (wait_usec > 0);
-	return -ETIMEDOUT;
+	return readl_poll_timeout_atomic(ptr, result,
+					 ((result & mask) == done),
+					 delay_usec, wait_usec);
 }
 
 /*
-- 
1.9.1