[U-Boot] [PATCH] drivers: net: phy: atheros: apply the previous register setting for AR8031 to fix the voltage peak issue

[ken <Ken Lin> <yungching0725@gmail.com>]

Apply the previous setting for the reserved bits in SetDes Test and System Mode Control register
to avoid the voltage peak issue while we do the IEEE PHY comformance test

Signed-off-by: ken Lin <ken.lin@advantech.com>
Tested on Advantech DMS-BA16 board
Tested-by: Ken Lin <ken.lin@advantech.com>
---
 drivers/net/phy/atheros.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/phy/atheros.c b/drivers/net/phy/atheros.c
index b34cdd3d87..82fe228604 100644
--- a/drivers/net/phy/atheros.c
+++ b/drivers/net/phy/atheros.c
@@ -28,6 +28,8 @@ static int ar8021_config(struct phy_device *phydev)
 
 static int ar8031_config(struct phy_device *phydev)
 {
+	int regval;
+
 	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID ||
 	    phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) {
 		phy_write(phydev, MDIO_DEVAD_NONE, AR803x_PHY_DEBUG_ADDR_REG,
@@ -44,6 +46,10 @@ static int ar8031_config(struct phy_device *phydev)
 			  AR803x_RGMII_RX_CLK_DLY);
 	}
 
+        phy_write(phydev, MDIO_DEVAD_NONE, AR803x_PHY_DEBUG_ADDR_REG, AR803x_DEBUG_REG_5);
+        regval = phy_read(phydev, MDIO_DEVAD_NONE, AR803x_PHY_DEBUG_DATA_REG);
+        phy_write(phydev, MDIO_DEVAD_NONE, AR803x_PHY_DEBUG_DATA_REG, regval | 0x3C47);
+
 	phydev->supported = phydev->drv->features;
 
 	genphy_config_aneg(phydev);
-- 
2.11.0