netdev - [PATCH 1/4] net: phy: aquantia: Enable Tx/Rx pause frame support in aquantia PHY

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Date:   Wed, 28 Jun 2023 18:13:23 +0530
From:   Revanth Kumar Uppala <ruppala@...dia.com>
To:     <linux@...linux.org.uk>, <andrew@...n.ch>, <hkallweit1@...il.com>,
        <netdev@...r.kernel.org>
CC:     <linux-tegra@...r.kernel.org>, Narayan Reddy <narayanr@...dia.com>,
        Revanth Kumar Uppala <ruppala@...dia.com>
Subject: [PATCH 1/4] net: phy: aquantia: Enable Tx/Rx pause frame support in aquantia PHY

From: Narayan Reddy <narayanr@...dia.com>

Enable flow control support using pause frames in aquantia phy driver.

Signed-off-by: Narayan Reddy <narayanr@...dia.com>
Signed-off-by: Revanth Kumar Uppala <ruppala@...dia.com>
---
 drivers/net/phy/aquantia_main.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/phy/aquantia_main.c b/drivers/net/phy/aquantia_main.c
index 334a6904ca5a..c99b9d066463 100644
--- a/drivers/net/phy/aquantia_main.c
+++ b/drivers/net/phy/aquantia_main.c
@@ -26,6 +26,8 @@
 #define PHY_ID_AQR412	0x03a1b712
 #define PHY_ID_AQR113C	0x31c31c12
 
+#define MDIO_AN_ADVT		0x0010
+
 #define MDIO_PHYXS_VEND_IF_STATUS		0xe812
 #define MDIO_PHYXS_VEND_IF_STATUS_TYPE_MASK	GENMASK(7, 3)
 #define MDIO_PHYXS_VEND_IF_STATUS_TYPE_KR	0
@@ -583,6 +585,17 @@ static int aqr107_config_init(struct phy_device *phydev)
 	if (!ret)
 		aqr107_chip_info(phydev);
 
+	/* Advertize flow control */
+	linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported);
+	linkmode_copy(phydev->advertising, phydev->supported);
+
+	/* Configure flow control */
+	ret = phy_set_bits_mmd(phydev, MDIO_MMD_AN, MDIO_AN_ADVT, ADVERTISE_PAUSE_CAP |
+			       ADVERTISE_PAUSE_ASYM);
+	if (ret < 0)
+		return ret;
+
 	return aqr107_set_downshift(phydev, MDIO_AN_VEND_PROV_DOWNSHIFT_DFLT);
 }
 
-- 
2.17.1