Subject: [PATCH 15/33] net: phy: marvell10g: report if the PHY fails to boot firmware

From: Russell King <[email-masked]>
Date: Tue, 28 May 2019 10:34:42 +0100

[ Upstream commit 3d3ced2ec5d71b99d72ae6910fbdf890bc2eccf0 ]

Some boards do not have the PHY firmware programmed in the 3310's flash,
which leads to the PHY not working as expected.  Warn the user when the
PHY fails to boot the firmware and refuse to initialise.

Fixes: 20b2af32ff3f ("net: phy: add Marvell Alaska X 88X3310 10Gigabit PHY support")
Signed-off-by: Russell King <[email-masked]>
Tested-by: Maxime Chevallier <[email-masked]>
Reviewed-by: Andrew Lunn <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 drivers/net/phy/marvell10g.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 6bac602094bd..8438f2f40d3d 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -29,6 +29,9 @@
 #define MDIO_AN_10GBT_CTRL_ADV_NBT_MASK	0x01e0
 
 enum {
+	MV_PMA_BOOT		= 0xc050,
+	MV_PMA_BOOT_FATAL	= BIT(0),
+
 	MV_PCS_BASE_T		= 0x0000,
 	MV_PCS_BASE_R		= 0x1000,
 	MV_PCS_1000BASEX	= 0x2000,
@@ -228,6 +231,16 @@ static int mv3310_probe(struct phy_device *phydev)
 	    (phydev->c45_ids.devices_in_package & mmd_mask) != mmd_mask)
 		return -ENODEV;
 
+	ret = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MV_PMA_BOOT);
+	if (ret < 0)
+		return ret;
+
+	if (ret & MV_PMA_BOOT_FATAL) {
+		dev_warn(&phydev->mdio.dev,
+			 "PHY failed to boot firmware, status=%04x\n", ret);
+		return -ENODEV;
+	}
+
 	priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
-- 
2.20.1