785-v5.14-02-net-dsa-qca8k-use-iopoll-macro-for-qca8k_busy_wait.patch

From 2ad255f2faaffb3af786031fba2e7955454b558a Mon Sep 17 00:00:00 2001
From: Ansuel Smith <ansuelsmth@gmail.com>
Date: Fri, 14 May 2021 22:59:52 +0200
Subject: [PATCH] net: dsa: qca8k: use iopoll macro for qca8k_busy_wait

Use iopoll macro instead of while loop.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/dsa/qca8k.c | 23 +++++++++++------------
 drivers/net/dsa/qca8k.h |  2 ++
 2 files changed, 13 insertions(+), 12 deletions(-)

--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -262,21 +262,20 @@ static struct regmap_config qca8k_regmap
 static int
 qca8k_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask)
 {
-	unsigned long timeout;
+	u32 val;
+	int ret;
 
-	timeout = jiffies + msecs_to_jiffies(20);
+	ret = read_poll_timeout(qca8k_read, val, !(val & mask),
+				0, QCA8K_BUSY_WAIT_TIMEOUT * USEC_PER_MSEC, false,
+				priv, reg);
 
-	/* loop until the busy flag has cleared */
-	do {
-		u32 val = qca8k_read(priv, reg);
-		int busy = val & mask;
+	/* Check if qca8k_read has failed for a different reason
+	 * before returning -ETIMEDOUT
+	 */
+	if (ret < 0 && val < 0)
+		return val;
 
-		if (!busy)
-			break;
-		cond_resched();
-	} while (!time_after_eq(jiffies, timeout));
-
-	return time_after_eq(jiffies, timeout);
+	return ret;
 }
 
 static void
--- a/drivers/net/dsa/qca8k.h
+++ b/drivers/net/dsa/qca8k.h
@@ -18,6 +18,8 @@
 #define PHY_ID_QCA8337					0x004dd036
 #define QCA8K_ID_QCA8337				0x13
 
+#define QCA8K_BUSY_WAIT_TIMEOUT				20
+
 #define QCA8K_NUM_FDB_RECORDS				2048
 
 #define QCA8K_CPU_PORT					0