netdev - [PATCH v3 2/5] net: phy: micrel: disable suspend/resume callbacks following errata

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Message-Id: <20240530102436.226189-3-enguerrand.de-ribaucourt@savoirfairelinux.com>
Date: Thu, 30 May 2024 10:24:33 +0000
From: Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@...oirfairelinux.com>
To: netdev@...r.kernel.org
Cc: andrew@...n.ch,
	hkallweit1@...il.com,
	linux@...linux.org.uk,
	woojung.huh@...rochip.com,
	embedded-discuss@...ts.savoirfairelinux.net,
	Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@...oirfairelinux.com>
Subject: [PATCH v3 2/5] net: phy: micrel: disable suspend/resume callbacks following errata

Microchip's erratas state that powering down a PHY may cause errors
on the adjacent PHYs due to the power supply noise. The suggested
workaround is to avoid toggling the powerdown bit dynamically while
traffic may be present.

Signed-off-by: Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@...oirfairelinux.com>
---
 drivers/net/phy/micrel.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 99322a3c3869..78f2040c3cd1 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -5514,8 +5514,9 @@ static struct phy_driver ksphy_driver[] = {
 	.config_init	= ksz9477_config_init,
 	.config_intr	= kszphy_config_intr,
 	.handle_interrupt = kszphy_handle_interrupt,
-	.suspend	= genphy_suspend,
-	.resume		= genphy_resume,
+	/* No suspend/resume callbacks because of errata DS80000758:
+	 * Toggling PHY Powerdown can cause errors or link failures in adjacent PHYs
+	 */
 	.get_features	= ksz9477_get_features,
 }, {
 	.name		= "Microchip KSZ9897 Switch",
@@ -5524,8 +5525,9 @@ static struct phy_driver ksphy_driver[] = {
 	.config_aneg	= ksz8873mll_config_aneg,
 	.read_status	= ksz8873mll_read_status,
 	.match_phy_device = ksz9897_match_phy_device,
-	.suspend	= genphy_suspend,
-	.resume		= genphy_resume,
+	/* No suspend/resume callbacks because of errata DS00002330D:
+	 * Toggling PHY Powerdown can cause errors or link failures in adjacent PHYs
+	 */
 } };
 
 module_phy_driver(ksphy_driver);
-- 
2.34.1