netdev - [PATCH net v2] net: phy: mxl-gpy: fix delay time required by loopback disable function

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Date:   Wed, 21 Dec 2022 17:43:58 +0800
From:   Xu Liang <lxu@...linear.com>
To:     <andrew@...n.ch>, <hkallweit1@...il.com>, <netdev@...r.kernel.org>,
        <davem@...emloft.net>, <kuba@...nel.org>
CC:     <linux@...linux.org.uk>, <hmehrtens@...linear.com>,
        <tmohren@...linear.com>, <mohammad.athari.ismail@...el.com>,
        <edumazet@...gle.com>, <pabeni@...hat.com>,
        Xu Liang <lxu@...linear.com>
Subject: [PATCH net v2] net: phy: mxl-gpy: fix delay time required by loopback disable function

GPY2xx devices need 3 seconds to fully switch out of loopback mode
before it can safely re-enter loopback mode.

Signed-off-by: Xu Liang <lxu@...linear.com>
---
 drivers/net/phy/mxl-gpy.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/mxl-gpy.c b/drivers/net/phy/mxl-gpy.c
index 147d7a5a9b35..b682d7fc477c 100644
--- a/drivers/net/phy/mxl-gpy.c
+++ b/drivers/net/phy/mxl-gpy.c
@@ -770,9 +770,11 @@ static int gpy_loopback(struct phy_device *phydev, bool enable)
 			 enable ? BMCR_LOOPBACK : 0);
 	if (!ret) {
 		/* It takes some time for PHY device to switch
-		 * into/out-of loopback mode.
+		 * into/out-of loopback mode. It takes 3 seconds
+		 * to fully switch out of loopback mode before
+		 * it can safely re-enter loopback mode.
 		 */
-		msleep(100);
+		msleep(enable ? 100 : 3000);
 	}
 
 	return ret;
-- 
2.17.1