openwrt/target/linux/generic/backport-6.6/836-v6.9-net-phy-aquantia-clear-PMD-Global-Transmit-Disable-b.patch

From cffac22c9215f1883d3848c788f9b03656dced27 Mon Sep 17 00:00:00 2001
From: Robert Marko <robimarko@gmail.com>
Date: Sun, 11 Feb 2024 18:39:19 +0100
Subject: [PATCH] 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.

aqr107_wait_processor_intensive_op() is moved up because datasheet notes
that any changes to this bit are processor intensive.

Signed-off-by: Robert Marko <robimarko@gmail.com>
---
 drivers/net/phy/aquantia/aquantia_main.c | 57 ++++++++++++++----------
 1 file changed, 33 insertions(+), 24 deletions(-)

--- a/drivers/net/phy/aquantia/aquantia_main.c
+++ b/drivers/net/phy/aquantia/aquantia_main.c
@@ -473,6 +473,30 @@ static void aqr107_chip_info(struct phy_
 		   fw_major, fw_minor, build_id, prov_id);
 }
 
+static int aqr107_wait_processor_intensive_op(struct phy_device *phydev)
+{
+	int val, err;
+
+	/* The datasheet notes to wait at least 1ms after issuing a
+	 * processor intensive operation before checking.
+	 * We cannot use the 'sleep_before_read' parameter of read_poll_timeout
+	 * because that just determines the maximum time slept, not the minimum.
+	 */
+	usleep_range(1000, 5000);
+
+	err = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
+					VEND1_GLOBAL_GEN_STAT2, val,
+					!(val & VEND1_GLOBAL_GEN_STAT2_OP_IN_PROG),
+					AQR107_OP_IN_PROG_SLEEP,
+					AQR107_OP_IN_PROG_TIMEOUT, false);
+	if (err) {
+		phydev_err(phydev, "timeout: processor-intensive MDIO operation\n");
+		return err;
+	}
+
+	return 0;
+}
+
 static int aqr107_config_init(struct phy_device *phydev)
 {
 	struct aqr107_priv *priv = phydev->priv;
@@ -498,6 +522,15 @@ static int aqr107_config_init(struct phy
 	if (!ret)
 		aqr107_chip_info(phydev);
 
+	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;
+
 	ret = aqr107_set_downshift(phydev, MDIO_AN_VEND_PROV_DOWNSHIFT_DFLT);
 	if (ret)
 		return ret;
@@ -580,30 +613,6 @@ static void aqr107_link_change_notify(st
 		phydev_info(phydev, "Aquantia 1000Base-T2 mode active\n");
 }
 
-static int aqr107_wait_processor_intensive_op(struct phy_device *phydev)
-{
-	int val, err;
-
-	/* The datasheet notes to wait at least 1ms after issuing a
-	 * processor intensive operation before checking.
-	 * We cannot use the 'sleep_before_read' parameter of read_poll_timeout
-	 * because that just determines the maximum time slept, not the minimum.
-	 */
-	usleep_range(1000, 5000);
-
-	err = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
-					VEND1_GLOBAL_GEN_STAT2, val,
-					!(val & VEND1_GLOBAL_GEN_STAT2_OP_IN_PROG),
-					AQR107_OP_IN_PROG_SLEEP,
-					AQR107_OP_IN_PROG_TIMEOUT, false);
-	if (err) {
-		phydev_err(phydev, "timeout: processor-intensive MDIO operation\n");
-		return err;
-	}
-
-	return 0;
-}
-
 static int aqr107_get_rate_matching(struct phy_device *phydev,
 				    phy_interface_t iface)
 {