netdev - [PATCH] net: phy: dp83867: perform soft reset and retain established link

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Date:   Tue, 23 Mar 2021 20:00:06 -0500
From:   <praneeth@...com>
To:     Praneeth Bajjuri <praneeth@...com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Geet Modi <geet.modi@...com>
Subject: [PATCH] net: phy: dp83867: perform soft reset and retain established link

From: Praneeth Bajjuri <praneeth@...com>

Current logic is performing hard reset and causing the programmed
registers to be wiped out.

as per datasheet: https://www.ti.com/lit/ds/symlink/dp83867cr.pdf
8.6.26 Control Register (CTRL)
do SW_RESTART to perform a reset not including the registers and is
acceptable to do this if a link is already present.

Signed-off-by: Praneeth Bajjuri <praneeth@...com>
Signed-off-by: Geet Modi <geet.modi@...com>
---
 drivers/net/phy/dp83867.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
index 9bd9a5c0b1db..29ab49e894db 100644
--- a/drivers/net/phy/dp83867.c
+++ b/drivers/net/phy/dp83867.c
@@ -826,7 +826,7 @@ static int dp83867_phy_reset(struct phy_device *phydev)
 {
 	int err;
 
-	err = phy_write(phydev, DP83867_CTRL, DP83867_SW_RESET);
+	err = phy_write(phydev, DP83867_CTRL, DP83867_SW_RESTART);
 	if (err < 0)
 		return err;
 
-- 
2.17.1