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Date:   Thu,  6 Feb 2020 22:24:03 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     peppe.cavallaro@...com, alexandre.torgue@...com,
        joabreu@...opsys.com, davem@...emloft.net,
        mcoquelin.stm32@...il.com, netdev@...r.kernel.org
Cc:     linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dejin Zheng <zhengdejin5@...il.com>
Subject: [PATCH 1/2] net: stmmac: use readl_poll_timeout() function in init_systime()

The init_systime() function use an open coded of readl_poll_timeout().
Replace the open coded handling with the proper function.

Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
---
 .../net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c  | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
index 020159622559..2a24e2a7db3b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
@@ -10,6 +10,7 @@
 *******************************************************************************/
 
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/delay.h>
 #include "common.h"
 #include "stmmac_ptp.h"
@@ -53,8 +54,8 @@ static void config_sub_second_increment(void __iomem *ioaddr,
 
 static int init_systime(void __iomem *ioaddr, u32 sec, u32 nsec)
 {
-	int limit;
 	u32 value;
+	int err;
 
 	writel(sec, ioaddr + PTP_STSUR);
 	writel(nsec, ioaddr + PTP_STNSUR);
@@ -64,13 +65,10 @@ static int init_systime(void __iomem *ioaddr, u32 sec, u32 nsec)
 	writel(value, ioaddr + PTP_TCR);
 
 	/* wait for present system time initialize to complete */
-	limit = 10;
-	while (limit--) {
-		if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSINIT))
-			break;
-		mdelay(10);
-	}
-	if (limit < 0)
+	err = readl_poll_timeout(ioaddr + PTP_TCR, value,
+				 !(value & PTP_TCR_TSINIT),
+				 10000, 100000);
+	if (err)
 		return -EBUSY;
 
 	return 0;
-- 
2.25.0

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