phy: phy-bcm-sr-usb: convert to readl_poll_timeout_atomic()

Use readl_poll_timeout_atomic() to simplify code
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1598320987-25518-3-git-send-email-chunfeng.yun@mediatek.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/broadcom/phy-bcm-sr-usb.c

@@ -5,6 +5,7 @@
 
 #include <linux/delay.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/phy/phy.h>
@@ -109,19 +110,15 @@ static inline void bcm_usb_reg32_setbits(void __iomem *addr, uint32_t set)
 
 static int bcm_usb_pll_lock_check(void __iomem *addr, u32 bit)
 {
-	int retry;
-	u32 rd_data;
-
-	retry = PLL_LOCK_RETRY_COUNT;
-	do {
-		rd_data = readl(addr);
-		if (rd_data & bit)
-			return 0;
-		udelay(1);
-	} while (--retry > 0);
+	u32 data;
+	int ret;
 
+	ret = readl_poll_timeout_atomic(addr, data, (data & bit), 1,
+					PLL_LOCK_RETRY_COUNT);
+	if (ret)
 		pr_err("%s: FAIL\n", __func__);
-	return -ETIMEDOUT;
+
+	return ret;
 }
 
 static int bcm_usb_ss_phy_init(struct bcm_usb_phy_cfg *phy_cfg)