[PATCH 4/6] net: phy: micrel: Center FLP timing at 16ms

[Philipp Zabel]

Based on kernel commit 6270e1ae804a ("net/phy: micrel: Center FLP
timing at 16ms") by Jaeden Amero <jaeden.amero at ni.com>:

Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
---
 drivers/net/phy/micrel.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 6f49e73..570272f 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -149,6 +149,11 @@ static int ksz9021_config_init(struct phy_device *phydev)
 #define KSZ9031_PS_TO_REG		60
 
 /* Extended registers */
+/* MMD Address 0x0 */
+#define MII_KSZ9031RN_FLP_BURST_TX_LO	3
+#define MII_KSZ9031RN_FLP_BURST_TX_HI	4
+
+/* MMD Address 0x2 */
 #define MII_KSZ9031RN_CONTROL_PAD_SKEW	4
 #define MII_KSZ9031RN_RX_DATA_PAD_SKEW	5
 #define MII_KSZ9031RN_TX_DATA_PAD_SKEW	6
@@ -192,6 +197,15 @@ static int ksz9031_of_load_skew_values(struct phy_device *phydev,
 	return 0;
 }
 
+static int ksz9031_center_flp_timing(struct phy_device *phydev)
+{
+	/* Center KSZ9031RNX FLP timing at 16ms. */
+	phy_write_mmd_indirect(phydev, MII_KSZ9031RN_FLP_BURST_TX_HI, 0, 0x0006);
+	phy_write_mmd_indirect(phydev, MII_KSZ9031RN_FLP_BURST_TX_LO, 0, 0x1a80);
+
+	return genphy_restart_aneg(phydev);
+}
+
 static int ksz9031_config_init(struct phy_device *phydev)
 {
 	const struct device_d *dev = &phydev->dev;
@@ -227,7 +241,8 @@ static int ksz9031_config_init(struct phy_device *phydev)
 				MII_KSZ9031RN_TX_DATA_PAD_SKEW, 4,
 				tx_data_skews, 4);
 	}
-	return 0;
+
+	return ksz9031_center_flp_timing(phydev);
 }
 
 #define KSZ8873MLL_GLOBAL_CONTROL_4	0x06
-- 
2.7.0.rc3