linux-kernel - [PATCH 5.4 21/34] net: phy: micrel: set soft_reset callback to genphy_soft

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Message-Id: <20220110071816.360206462@linuxfoundation.org>
Date:   Mon, 10 Jan 2022 08:23:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christian Melki <christian.melki@...ata.com>,
        Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
        Wadim Egorov <w.egorov@...tec.de>
Subject: [PATCH 5.4 21/34] net: phy: micrel: set soft_reset callback to genphy_soft_reset for KSZ8081

From: Christian Melki <christian.melki@...ata.com>

commit 764d31cacfe48440745c4bbb55a62ac9471c9f19 upstream.

Following a similar reinstate for the KSZ9031.

Older kernels would use the genphy_soft_reset if the PHY did not implement
a .soft_reset.

Bluntly removing that default may expose a lot of situations where various
PHYs/board implementations won't recover on various changes.
Like with this implementation during a 4.9.x to 5.4.x LTS transition.
I think it's a good thing to remove unwanted soft resets but wonder if it
did open a can of worms?

Atleast this fixes one iMX6 FEC/RMII/8081 combo.

Fixes: 6e2d85ec0559 ("net: phy: Stop with excessive soft reset")
Signed-off-by: Christian Melki <christian.melki@...ata.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Link: https://lore.kernel.org/r/20210224205536.9349-1-christian.melki@t2data.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Wadim Egorov <w.egorov@...tec.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/phy/micrel.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -1096,6 +1096,7 @@ static struct phy_driver ksphy_driver[]
 	.probe		= kszphy_probe,
 	.config_init	= ksz8081_config_init,
 	.ack_interrupt	= kszphy_ack_interrupt,
+	.soft_reset	= genphy_soft_reset,
 	.config_intr	= kszphy_config_intr,
 	.get_sset_count = kszphy_get_sset_count,
 	.get_strings	= kszphy_get_strings,