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Date:   Wed,  8 May 2019 04:29:22 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Serge Semin <Sergey.Semin@...latforms.ru>,
        Vladimir Oltean <olteanv@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] net: phy: realtek: Change TX-delay setting for RGMII modes only

It's prone to problems if delay is cleared out for other than RGMII
modes. So lets set/clear the TX-delay in the config register only
if actually RGMII-like interface mode is requested.

Signed-off-by: Serge Semin <fancer.lancer@...il.com>

---
Changelog v3
- Accept RGMII_RXID interface mode by clearing the TX_DELAY bit
  in this case.
---
 drivers/net/phy/realtek.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index d27f072f227b..134b5fc7926d 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -164,16 +164,27 @@ static int rtl8211c_config_init(struct phy_device *phydev)
 static int rtl8211f_config_init(struct phy_device *phydev)
 {
 	int ret;
-	u16 val = 0;
+	u16 val;
 
 	ret = genphy_config_init(phydev);
 	if (ret < 0)
 		return ret;
 
-	/* enable TX-delay for rgmii-id and rgmii-txid, otherwise disable it */
-	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
-	    phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
+	/* enable TX-delay for rgmii-txid, and disable it for rgmii and
+	 * rgmii-rxid. The last one might be enabled by external RXDLY pin
+	 * strapping.
+	 */
+	switch (phydev->interface) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+		val = 0;
+		break;
+	case PHY_INTERFACE_MODE_RGMII_TXID:
 		val = RTL8211F_TX_DELAY;
+		break;
+	default: /* the rest of the modes imply leaving delay as is. */
+		return 0;
+	}
 
 	return phy_modify_paged(phydev, 0xd08, 0x11, RTL8211F_TX_DELAY, val);
 }
-- 
2.21.0

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