linux-kernel - [PATCH net-next v2] net: phy: marvell: add sleep time after enabling the loopback bit

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Date:   Tue,  8 Nov 2022 15:40:05 +0800
From:   Aminuddin Jamaluddin <aminuddin.jamaluddin@...el.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Mohammad Athari Bin Ismail <mohammad.athari.ismail@...el.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, tee.min.tan@...el.com,
        muhammad.husaini.zulkifli@...el.com,
        aminuddin.jamaluddin@...el.com, hong.aun.looi@...el.com
Subject: [PATCH net-next v2] net: phy: marvell: add sleep time after enabling the loopback bit

Sleep time is added to ensure the phy to be ready after loopback
bit was set. This to prevent the phy loopback test from failing.

---
V1: https://patchwork.kernel.org/project/netdevbpf/patch/20220825082238.11056-1-aminuddin.jamaluddin@intel.com/
---

Fixes: 020a45aff119 ("net: phy: marvell: add Marvell specific PHY loopback")
Cc: <stable@...r.kernel.org> # 5.15.x
Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>
Signed-off-by: Aminuddin Jamaluddin <aminuddin.jamaluddin@...el.com>
---
 drivers/net/phy/marvell.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index a3e810705ce2..860610ba4d00 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -2015,14 +2015,16 @@ static int m88e1510_loopback(struct phy_device *phydev, bool enable)
 		if (err < 0)
 			return err;
 
-		/* FIXME: Based on trial and error test, it seem 1G need to have
-		 * delay between soft reset and loopback enablement.
-		 */
-		if (phydev->speed == SPEED_1000)
-			msleep(1000);
+		err = phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK,
+				 BMCR_LOOPBACK);
 
-		return phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK,
-				  BMCR_LOOPBACK);
+		if (!err) {
+			/* It takes some time for PHY device to switch
+			 * into/out-of loopback mode.
+			 */
+			msleep(1000);
+		}
+		return err;
 	} else {
 		err = phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, 0);
 		if (err < 0)
-- 
2.17.1