linux-kernel - [PATCH v2 09/11] usb: phy: phy-mv-usb: convert to readl_poll_timeout

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Message-ID: <1597902349-8998-9-git-send-email-chunfeng.yun@mediatek.com>
Date:   Thu, 20 Aug 2020 13:45:47 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Felipe Balbi <balbi@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Lee Jones <lee.jones@...aro.org>
Subject: [PATCH v2 09/11] usb: phy: phy-mv-usb: convert to readl_poll_timeout_atomic()

Use readl_poll_timeout_atomic() to simplify code

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
v2: udelay 10us instead of 20us according to kerneldoc
---
 drivers/usb/phy/phy-mv-usb.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/phy/phy-mv-usb.c b/drivers/usb/phy/phy-mv-usb.c
index ce767ec..e801569 100644
--- a/drivers/usb/phy/phy-mv-usb.c
+++ b/drivers/usb/phy/phy-mv-usb.c
@@ -8,6 +8,7 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/uaccess.h>
 #include <linux/device.h>
 #include <linux/proc_fs.h>
@@ -135,8 +136,8 @@ static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
 
 static int mv_otg_reset(struct mv_otg *mvotg)
 {
-	unsigned int loops;
 	u32 tmp;
+	int ret;
 
 	/* Stop the controller */
 	tmp = readl(&mvotg->op_regs->usbcmd);
@@ -146,15 +147,12 @@ static int mv_otg_reset(struct mv_otg *mvotg)
 	/* Reset the controller to get default values */
 	writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
 
-	loops = 500;
-	while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
-		if (loops == 0) {
-			dev_err(&mvotg->pdev->dev,
+	ret = readl_poll_timeout_atomic(&mvotg->op_regs->usbcmd, tmp,
+				(tmp & USBCMD_CTRL_RESET), 10, 10000);
+	if (ret < 0) {
+		dev_err(&mvotg->pdev->dev,
 				"Wait for RESET completed TIMEOUT\n");
-			return -ETIMEDOUT;
-		}
-		loops--;
-		udelay(20);
+		return ret;
 	}
 
 	writel(0x0, &mvotg->op_regs->usbintr);
-- 
1.9.1