[PATCH net v1 3/3] net: phy: mscc: coma mode disabled for VSC8514

[Bjarni Jonasson <bjarni.jonasson@microchip.com>]

The 'coma mode' (configurable through sw or hw) provides an
optional feature that may be used to control when the PHYs become active.
The typical usage is to synchronize the link-up time across
all PHY instances. This patch releases coma mode if not done by hardware,
otherwise the phys will not link-up.

Signed-off-by: Steen Hegelund <steen.hegelund@microchip.com>
Signed-off-by: Bjarni Jonasson <bjarni.jonasson@microchip.com>
Fixes: e4f9ba642f0b ("net: phy: mscc: add support for VSC8514 PHY.")
---
 drivers/net/phy/mscc/mscc_main.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/phy/mscc/mscc_main.c b/drivers/net/phy/mscc/mscc_main.c
index 7546d9cc3abd..0600b592618b 100644
--- a/drivers/net/phy/mscc/mscc_main.c
+++ b/drivers/net/phy/mscc/mscc_main.c
@@ -1418,6 +1418,18 @@ static void vsc8584_get_base_addr(struct phy_device *phydev)
 	vsc8531->addr = addr;
 }
 
+static void vsc85xx_coma_mode_release(struct phy_device *phydev)
+{
+	/* The coma mode (pin or reg) provides an optional feature that
+	 * may be used to control when the PHYs become active.
+	 * Alternatively the COMA_MODE pin may be connected low
+	 * so that the PHYs are fully active once out of reset.
+	 */
+	__phy_write(phydev, MSCC_EXT_PAGE_ACCESS, MSCC_PHY_PAGE_EXTENDED_GPIO);
+	__phy_write(phydev, MSCC_PHY_GPIO_CONTROL_2, 0x0600);
+	__phy_write(phydev, MSCC_EXT_PAGE_ACCESS, MSCC_PHY_PAGE_STANDARD);
+}
+
 static int vsc8584_config_init(struct phy_device *phydev)
 {
 	struct vsc8531_private *vsc8531 = phydev->priv;
@@ -2610,6 +2622,7 @@ static int vsc8514_config_init(struct phy_device *phydev)
 		ret = vsc8514_config_host_serdes(phydev);
 		if (ret)
 			goto err;
+		vsc85xx_coma_mode_release(phydev);
 	}
 
 	phy_unlock_mdio_bus(phydev);
-- 
2.17.1