linux-kernel - [PATCH 5.15 141/317] net: phy: DP83822: enable rgmii mode if phy_interface_is

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Date: Sun, 24 Mar 2024 19:32:01 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>,
	Michael Trimarchi <michael@...rulasolutions.com>,
	Alberto Bianchi <alberto.bianchi@...rulasolutions.com>,
	Andrew Lunn <andrew@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 141/317] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii

From: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>

[ Upstream commit 621427fbdada788f18f77238e1c36f463c2cb9d1 ]

RGMII mode can be enable from dp83822 straps, and also writing bit 9
of register 0x17 - RMII and Status Register (RCSR).
When phy_interface_is_rgmii rgmii mode must be enabled, same for
contrary, this prevents malconfigurations of hw straps

References:
 - https://www.ti.com/lit/gpn/dp83822i p66

Signed-off-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
Co-developed-by: Michael Trimarchi <michael@...rulasolutions.com>
Suggested-by: Alberto Bianchi <alberto.bianchi@...rulasolutions.com>
Tested-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: David S. Miller <davem@...emloft.net>
Stable-dep-of: c8a5c731fd12 ("net: phy: dp83822: Fix RGMII TX delay configuration")
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/phy/dp83822.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
index f070aa97c77b4..267e6fd3d4448 100644
--- a/drivers/net/phy/dp83822.c
+++ b/drivers/net/phy/dp83822.c
@@ -94,7 +94,8 @@
 #define DP83822_WOL_INDICATION_SEL BIT(8)
 #define DP83822_WOL_CLR_INDICATION BIT(11)
 
-/* RSCR bits */
+/* RCSR bits */
+#define DP83822_RGMII_MODE_EN	BIT(9)
 #define DP83822_RX_CLK_SHIFT	BIT(12)
 #define DP83822_TX_CLK_SHIFT	BIT(11)
 
@@ -407,6 +408,12 @@ static int dp83822_config_init(struct phy_device *phydev)
 			if (err)
 				return err;
 		}
+
+		phy_set_bits_mmd(phydev, DP83822_DEVADDR,
+					MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
+	} else {
+		phy_clear_bits_mmd(phydev, DP83822_DEVADDR,
+					MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
 	}
 
 	if (dp83822->fx_enabled) {
-- 
2.43.0