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Date:   Tue, 11 Aug 2020 00:06:44 +0200
From:   Marek Behún <marek.behun@....cz>
To:     Russell King <rmk+kernel@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Baruch Siach <baruch@...s.co.il>,
        Chris Healy <cphealy@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org,
        Marek Behún <marek.behun@....cz>
Subject: [PATCH RFC russell-king 3/4] net: phy: marvell10g: change MACTYPE according to phydev->interface

RollBall SFPs contain Marvell 88X3310 PHY, but they have configuration
pins strapped so that MACTYPE is configured in XFI with Rate Matching
mode.

When these SFPs are inserted into a device which only supports lower
speeds on host interface, we need to configure the MACTYPE to a mode
in which the H unit changes SerDes speed according to speed on the
copper interface. I chose to use the
10GBASE-R/5GBASE-R/2500BASE-X/SGMII with AN mode.

Signed-off-by: Marek Behún <marek.behun@....cz>
---
 drivers/net/phy/marvell10g.c | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 29575442b25b2..13a588fa69e77 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -81,6 +81,7 @@ enum {
 	MV_V2_PORT_CTRL_SWRST	= BIT(15),
 	MV_V2_PORT_CTRL_PWRDOWN = BIT(11),
 	MV_V2_PORT_MAC_TYPE_MASK = 0x7,
+	MV_V2_PORT_MAC_TYPE_10GBR_SGMII_AN = 0x4,
 	MV_V2_PORT_MAC_TYPE_RATE_MATCH = 0x6,
 	/* Temperature control/read registers (88X3310 only) */
 	MV_V2_TEMP_CTRL		= 0xf08a,
@@ -258,17 +259,40 @@ static int mv3310_power_down(struct phy_device *phydev)
 static int mv3310_power_up(struct phy_device *phydev)
 {
 	struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
+	u16 val, mask;
 	int ret;
 
 	ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2, MV_V2_PORT_CTRL,
 				 MV_V2_PORT_CTRL_PWRDOWN);
 
-	if (phydev->drv->phy_id != MARVELL_PHY_ID_88X3310 ||
-	    priv->firmware_ver < 0x00030000)
+	if (ret < 0)
 		return ret;
 
-	return phy_set_bits_mmd(phydev, MDIO_MMD_VEND2, MV_V2_PORT_CTRL,
-				MV_V2_PORT_CTRL_SWRST);
+	/* TODO: add support for changing MACTYPE on 88E2110 via register 1.C0A4.2:0 */
+	if (phydev->drv->phy_id != MARVELL_PHY_ID_88X3310)
+		return 0;
+
+	val = mask = MV_V2_PORT_CTRL_SWRST;
+
+	switch (phydev->interface) {
+	case PHY_INTERFACE_MODE_SGMII:
+	case PHY_INTERFACE_MODE_2500BASEX:
+		val |= MV_V2_PORT_MAC_TYPE_10GBR_SGMII_AN;
+		mask |= MV_V2_PORT_MAC_TYPE_MASK;
+		break;
+
+	default:
+		/* Otherwise we assume that the MACTYPE is set correctly by strapping pins.
+		 * Feel free to add support for changing MACTYPE for other modes
+		 * (XAUI/RXAUI/USXGMII).
+		 */
+
+		/* reset is not needed for firmware version < 0.3.0.0 when not changing MACTYPE */
+		if (priv->firmware_ver < 0x00030000)
+			return 0;
+	}
+
+	return phy_modify_mmd(phydev, MDIO_MMD_VEND2, MV_V2_PORT_CTRL, mask, val);
 }
 
 static int mv3310_reset(struct phy_device *phydev, u32 unit)
-- 
2.26.2

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