linux-kernel - [PATCH v4 07/11] usb: isp1760-hcd: convert to readl_poll_timeout

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Date:   Mon, 21 Sep 2020 14:13:31 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>
CC:     Mathias Nyman <mathias.nyman@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Sumit Garg <sumit.garg@...aro.org>,
        Lee Jones <lee.jones@...aro.org>, Jann Horn <jannh@...gle.com>,
        Jason Yan <yanaijie@...wei.com>, Arnd Bergmann <arnd@...db.de>,
        Chuhong Yuan <hslester96@...il.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        "Ben Dooks (Codethink)" <ben.dooks@...ethink.co.uk>,
        Saurav Girepunje <saurav.girepunje@...il.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Daniel Thompson <daniel.thompson@...aro.org>
Subject: [PATCH v4 07/11] usb: isp1760-hcd: convert to readl_poll_timeout_atomic()

Use readl_poll_timeout_atomic() to simplify code

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
v2~v4: 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