linux-kernel - [PATCH net-next] net: phy: aquantia: clear PMD Global Transmit Disable bit during init

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Date: Sun, 11 Feb 2024 19:16:41 +0100
From: Robert Marko <robimarko@...il.com>
To: andrew@...n.ch,
	hkallweit1@...il.com,
	linux@...linux.org.uk,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	ansuelsmth@...il.com,
	rmk+kernel@...linux.org.uk,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Robert Marko <robimarko@...il.com>
Subject: [PATCH net-next] net: phy: aquantia: clear PMD Global Transmit Disable bit during init

PMD Global Transmit Disable bit should be cleared for normal operation.
This should be HW default, however I found that on Asus RT-AX89X that uses
AQR113C PHY and firmware 5.4 this bit is set by default.

With this bit set the AQR cannot achieve a link with its link-partner and
it took me multiple hours of digging through the vendor GPL source to find
this out, so lets always clear this bit during .config_init() to avoid a
situation like this in the future.

Signed-off-by: Robert Marko <robimarko@...il.com>
---
 drivers/net/phy/aquantia/aquantia_main.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/phy/aquantia/aquantia_main.c b/drivers/net/phy/aquantia/aquantia_main.c
index 97a2fafa15ca..e1f092cbfdce 100644
--- a/drivers/net/phy/aquantia/aquantia_main.c
+++ b/drivers/net/phy/aquantia/aquantia_main.c
@@ -727,6 +727,15 @@ static int aqr113c_config_init(struct phy_device *phydev)
 	if (ret < 0)
 		return ret;
 
+	ret = phy_clear_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_TXDIS,
+				 MDIO_PMD_TXDIS_GLOBAL);
+	if (ret)
+		return ret;
+
+	ret = aqr107_wait_processor_intensive_op(phydev);
+	if (ret)
+		return ret;
+
 	return aqr107_fill_interface_modes(phydev);
 }
 
-- 
2.43.0