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From:   Dejin Zheng <zhengdejin5@gmail.com>
To:     peppe.cavallaro@st.com, alexandre.torgue@st.com,
        joabreu@synopsys.com, davem@davemloft.net,
        mcoquelin.stm32@gmail.com, netdev@vger.kernel.org
Cc:     linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Dejin Zheng <zhengdejin5@gmail.com>
Subject: [PATCH 2/2] net: stmmac: use readl_poll_timeout() function in dwmac4_dma_reset()
Date:   Thu,  6 Feb 2020 22:24:04 +0800
Message-Id: <20200206142404.24980-3-zhengdejin5@gmail.com>
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The dwmac4_dma_reset() function use an open coded of readl_poll_timeout().
Replace the open coded handling with the proper function.

Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
index f2a29a90e085..6b911e360e27 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/delay.h>
 #include "common.h"
 #include "dwmac4_dma.h"
@@ -14,19 +15,16 @@
 int dwmac4_dma_reset(void __iomem *ioaddr)
 {
 	u32 value = readl(ioaddr + DMA_BUS_MODE);
-	int limit;
+	int err;
 
 	/* DMA SW reset */
 	value |= DMA_BUS_MODE_SFT_RESET;
 	writel(value, ioaddr + DMA_BUS_MODE);
-	limit = 10;
-	while (limit--) {
-		if (!(readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET))
-			break;
-		mdelay(10);
-	}
 
-	if (limit < 0)
+	err = readl_poll_timeout(ioaddr + DMA_BUS_MODE, value,
+				 !(value & DMA_BUS_MODE_SFT_RESET),
+				 10000, 100000);
+	if (err)
 		return -EBUSY;
 
 	return 0;
-- 
2.25.0