linux-kernel - [PATCH net-next v5 09/10] net: phy: smsc: use phy_read_poll

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Date:   Mon, 23 Mar 2020 01:49:42 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     andrew@...n.ch, f.fainelli@...il.com, hkallweit1@...il.com,
        linux@...linux.org.uk, davem@...emloft.net,
        mchehab+samsung@...nel.org, corbet@....net,
        gregkh@...uxfoundation.org, broonie@...nel.org, tglx@...utronix.de,
        netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dejin Zheng <zhengdejin5@...il.com>
Subject: [PATCH net-next v5 09/10] net: phy: smsc: use phy_read_poll_timeout() to simplify the code

use phy_read_poll_timeout() to replace the poll codes for
simplify lan87xx_read_status() function.

it should be add msleep(10) before call phy_read_poll_timeout()
to keep the code more similar, but it will report that warning, so
modify it to msleep(20).

./scripts/checkpatch.pl
v5-0009-net-phy-smsc-use-phy_read_poll_timeout-to-simplif.patch
WARNING: msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.rst
#42: FILE: drivers/net/phy/smsc.c:126:
+		msleep(10);

Suggested-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
---
v4 -> v5:
	- add msleep before phy_read_poll_timeout() to keep the
	  code more similar
v3 -> v4:
	- add this patch by Andrew's suggestion. Thanks Andrew!

 drivers/net/phy/smsc.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index b73298250793..f888523086ed 100644
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -112,8 +112,6 @@ static int lan87xx_read_status(struct phy_device *phydev)
 	int err = genphy_read_status(phydev);
 
 	if (!phydev->link && priv->energy_enable) {
-		int i;
-
 		/* Disable EDPD to wake up PHY */
 		int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
 		if (rc < 0)
@@ -125,15 +123,12 @@ static int lan87xx_read_status(struct phy_device *phydev)
 			return rc;
 
 		/* Wait max 640 ms to detect energy */
-		for (i = 0; i < 64; i++) {
-			/* Sleep to allow link test pulses to be sent */
-			msleep(10);
-			rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
-			if (rc < 0)
-				return rc;
-			if (rc & MII_LAN83C185_ENERGYON)
-				break;
-		}
+		msleep(20);
+		phy_read_poll_timeout(phydev, MII_LAN83C185_CTRL_STATUS, rc,
+				      rc & MII_LAN83C185_ENERGYON, 10000,
+				      620000);
+		if (rc < 0)
+			return rc;
 
 		/* Re-enable EDPD */
 		rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
-- 
2.25.0