linux-kernel - [PATCH] net: mdio: meson-gxl set 28th bit in eth

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Date: Tue, 21 May 2024 14:56:45 -0400
From: Da Xue <da@...re.computer>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, 
	Russell King <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Kevin Hilman <khilman@...libre.com>, 
	Jerome Brunet <jbrunet@...libre.com>, 
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>, netdev@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-amlogic@...ts.infradead.org, 
	linux-kernel@...r.kernel.org
Cc: linux-stable <stable@...r.kernel.org>
Subject: [PATCH] net: mdio: meson-gxl set 28th bit in eth_reg2

This bit is necessary to enable packets on the interface. Without this
bit set, ethernet behaves as if it is working but no activity occurs.

The vendor SDK sets this bit along with the PHY_ID bits. u-boot will set
this bit as well but if u-boot is not compiled with networking, the
interface will not work.

Fixes: 9a24e1ff4326 ("net: mdio: add amlogic gxl mdio mux support");

Signed-off-by: Da Xue <da@...re.computer>
---
 drivers/net/mdio/mdio-mux-meson-gxl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mdio/mdio-mux-meson-gxl.c
b/drivers/net/mdio/mdio-mux-meson-gxl.c
index 89554021b5cc..b2bd57f54034 100644
--- a/drivers/net/mdio/mdio-mux-meson-gxl.c
+++ b/drivers/net/mdio/mdio-mux-meson-gxl.c
@@ -17,6 +17,7 @@
 #define  REG2_LEDACT GENMASK(23, 22)
 #define  REG2_LEDLINK GENMASK(25, 24)
 #define  REG2_DIV4SEL BIT(27)
+#define  REG2_RESERVED_28 BIT(28)
 #define  REG2_ADCBYPASS BIT(30)
 #define  REG2_CLKINSEL BIT(31)
 #define ETH_REG3 0x4
@@ -65,7 +66,7 @@ static void gxl_enable_internal_mdio(struct
gxl_mdio_mux *priv)
  * The only constraint is that it must match the one in
  * drivers/net/phy/meson-gxl.c to properly match the PHY.
  */
- writel(FIELD_PREP(REG2_PHYID, EPHY_GXL_ID),
+ writel(REG2_RESERVED_28 | FIELD_PREP(REG2_PHYID, EPHY_GXL_ID),
         priv->regs + ETH_REG2);

  /* Enable the internal phy */
-- 
2.39.2