linux-kernel - [PATCH] net: phy: disable eee due to errata on various KSZ switches

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Message-Id: <20241004213235.3353398-1-tharvey@gateworks.com>
Date: Fri,  4 Oct 2024 14:32:35 -0700
From: Tim Harvey <tharvey@...eworks.com>
To: Woojung Huh <woojung.huh@...rochip.com>,
	UNGLinuxDriver@...rochip.com,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Tim Harvey <tharvey@...eworks.com>
Subject: [PATCH] net: phy: disable eee due to errata on various KSZ switches

The well-known errata regarding EEE not being functional on various KSZ
switches has been refactored a few times. Recently the refactoring has
excluded several switches that the errata should also apply to.

Disable EEE for these switches based on errata.

Signed-off-by: Tim Harvey <tharvey@...eworks.com>
---
 drivers/net/dsa/microchip/ksz_common.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index b074b4bb0629..d2bd82a1067c 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2578,11 +2578,19 @@ static u32 ksz_get_phy_flags(struct dsa_switch *ds, int port)
 		if (!port)
 			return MICREL_KSZ8_P1_ERRATA;
 		break;
+	case KSZ8795_CHIP_ID:
+	case KSZ8794_CHIP_ID:
+	case KSZ8765_CHIP_ID:
+		/* KSZ87xx DS80000687C Module 2 */
+	case KSZ9896_CHIP_ID:
+		/* KSZ9896 Errata DS80000757A Module 2 */
+	case KSZ9897_CHIP_ID:
+		/* KSZ9897 Errata DS00002394C Module 4 */
+	case KSZ9567_CHIP_ID:
+		/* KSZ9567 Errata DS80000756A Module 4 */
 	case KSZ9477_CHIP_ID:
-		/* KSZ9477 Errata DS80000754C
-		 *
-		 * Module 4: Energy Efficient Ethernet (EEE) feature select must
-		 * be manually disabled
+		/* KSZ9477 Errata DS80000754C Module 4 */
+		/* Energy Efficient Ethernet (EEE) feature select must be manually disabled
 		 *   The EEE feature is enabled by default, but it is not fully
 		 *   operational. It must be manually disabled through register
 		 *   controls. If not disabled, the PHY ports can auto-negotiate
-- 
2.25.1