linux-kernel - [PATCH net v3 1/2] net: phy: aquantia: AQR115c fix up PMA capabilities

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Message-Id: <20240925230129.2064336-2-quic_abchauha@quicinc.com>
Date: Wed, 25 Sep 2024 16:01:28 -0700
From: Abhishek Chauhan <quic_abchauha@...cinc.com>
To: "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andrew Halaney <ahalaney@...hat.com>,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        Brad Griffis <bgriffis@...dia.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Jon Hunter <jonathanh@...dia.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Przemek Kitszel <przemyslaw.kitszel@...el.com>
Cc: kernel@...cinc.com
Subject: [PATCH net v3 1/2] net: phy: aquantia: AQR115c fix up PMA capabilities

AQR115c reports incorrect PMA capabilities which includes
10G/5G and also incorrectly disables capabilities like autoneg
and 10Mbps support.

AQR115c as per the Marvell databook supports speeds up to 2.5Gbps
with autonegotiation.

Fixes: 0ebc581f8a4b ("net: phy: aquantia: add support for aqr115c")
Link: https://lore.kernel.org/all/20240913011635.1286027-1-quic_abchauha@quicinc.com/T/
Signed-off-by: Abhishek Chauhan <quic_abchauha@...cinc.com>
---
Changes since v2
1. seperate out the changes into two different patches. 
3. use phy_gbit_features instead of initializing each and 
every link mode bits. 
4. write seperate functions for 2.5Gbps supported phy 
5. remove FIBRE bit which was introduced in patch 1

Changes since v1 
1. remove usage of phy_set_max_speed in the aquantia driver code.
2. Introduce aqr_custom_get_feature which checks for the phy id and
   takes necessary actions based on max_speed supported by the phy
3. remove aqr111_config_init as it is just a wrapper function. 

 drivers/net/phy/aquantia/aquantia_main.c | 28 ++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/net/phy/aquantia/aquantia_main.c b/drivers/net/phy/aquantia/aquantia_main.c
index e982e9ce44a5..88ba12aaf6e0 100644
--- a/drivers/net/phy/aquantia/aquantia_main.c
+++ b/drivers/net/phy/aquantia/aquantia_main.c
@@ -767,6 +767,33 @@ static int aqr111_config_init(struct phy_device *phydev)
 	return aqr107_config_init(phydev);
 }
 
+static int aqr115c_get_features(struct phy_device *phydev)
+{
+	int ret;
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported) = { 0, };
+
+	/* Normal feature discovery */
+	ret = genphy_c45_pma_read_abilities(phydev);
+	if (ret)
+		return ret;
+
+	/* PHY FIXUP */
+	/* Although the PHY sets bit 12.18.19.48, it does not support 5G/10G modes */
+	linkmode_clear_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT, phydev->supported);
+	linkmode_clear_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT, phydev->supported);
+	linkmode_clear_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT, phydev->supported);
+	linkmode_clear_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT, phydev->supported);
+
+	/* Phy supports Speeds up to 2.5G with Autoneg though the phy PMA says otherwise */
+	linkmode_copy(supported, phy_gbit_features);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseX_Full_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, supported);
+
+	linkmode_or(phydev->supported, supported, phydev->supported);
+
+	return 0;
+}
+
 static struct phy_driver aqr_driver[] = {
 {
 	PHY_ID_MATCH_MODEL(PHY_ID_AQ1202),
@@ -1036,6 +1063,7 @@ static struct phy_driver aqr_driver[] = {
 	.get_sset_count = aqr107_get_sset_count,
 	.get_strings    = aqr107_get_strings,
 	.get_stats      = aqr107_get_stats,
+	.get_features   = aqr115c_get_features,
 	.link_change_notify = aqr107_link_change_notify,
 	.led_brightness_set = aqr_phy_led_brightness_set,
 	.led_hw_is_supported = aqr_phy_led_hw_is_supported,
-- 
2.25.1