[PATCH 4.14 170/211] net: phy: dp83867: fix speed 10 in sgmii mode

[Greg Kroah-Hartman]

From: Max Uvarov <muvarov@xxxxxxxxx>

commit 333061b924539c0de081339643f45514f5f1c1e6 upstream.

For supporting 10Mps speed in SGMII mode DP83867_10M_SGMII_RATE_ADAPT bit
of DP83867_10M_SGMII_CFG register has to be cleared by software.
That does not affect speeds 100 and 1000 so can be done on init.

Signed-off-by: Max Uvarov <muvarov@xxxxxxxxx>
Cc: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
[ adapted for kernels without phy_modify_mmd ]
Signed-off-by: Adrian Bunk <bunk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/net/phy/dp83867.c |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

--- a/drivers/net/phy/dp83867.c
+++ b/drivers/net/phy/dp83867.c
@@ -37,6 +37,8 @@
 #define DP83867_STRAP_STS1	0x006E
 #define DP83867_RGMIIDCTL	0x0086
 #define DP83867_IO_MUX_CFG	0x0170
+#define DP83867_10M_SGMII_CFG   0x016F
+#define DP83867_10M_SGMII_RATE_ADAPT_MASK BIT(7)
 
 #define DP83867_SW_RESET	BIT(15)
 #define DP83867_SW_RESTART	BIT(14)
@@ -283,6 +285,23 @@ static int dp83867_config_init(struct ph
 		}
 	}
 
+	if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
+		/* For support SPEED_10 in SGMII mode
+		 * DP83867_10M_SGMII_RATE_ADAPT bit
+		 * has to be cleared by software. That
+		 * does not affect SPEED_100 and
+		 * SPEED_1000.
+		 */
+		val = phy_read_mmd(phydev, DP83867_DEVADDR,
+				   DP83867_10M_SGMII_CFG);
+		val &= ~DP83867_10M_SGMII_RATE_ADAPT_MASK;
+		ret = phy_write_mmd(phydev, DP83867_DEVADDR,
+				    DP83867_10M_SGMII_CFG, val);
+
+		if (ret)
+			return ret;
+	}
+
 	/* Enable Interrupt output INT_OE in CFG3 register */
 	if (phy_interrupt_is_valid(phydev)) {
 		val = phy_read(phydev, DP83867_CFG3);