netdev - [PATCH] net: phy: at803x: disable delay only for RGMII mode

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Message-Id: <20190212141922.12849-1-vkoul@kernel.org>
Date:   Tue, 12 Feb 2019 19:49:22 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     David S Miller <davem@...emloft.net>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, netdev@...r.kernel.org,
        Niklas Cassel <niklas.cassel@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "Nori, Sekhar" <nsekhar@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>
Subject: [PATCH] net: phy: at803x: disable delay only for RGMII mode

Per "Documentation/devicetree/bindings/net/ethernet.txt" RGMII mode
should not have delay in PHY whereas RGMII_ID and RGMII_RXID/RGMII_TXID
can have delay in phy.

So disable the delay only for RGMII mode and disable for other modes

Fixes: cd28d1d6e52e: ("net: phy: at803x: Disable phy delay for RGMII mode")
Reported-by: Peter Ujfalusi <peter.ujfalusi@...com>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
---
 drivers/net/phy/at803x.c | 33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index 8ff12938ab47..7b54b54e3316 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -110,6 +110,18 @@ static int at803x_debug_reg_mask(struct phy_device *phydev, u16 reg,
 	return phy_write(phydev, AT803X_DEBUG_DATA, val);
 }
 
+static inline int at803x_enable_rx_delay(struct phy_device *phydev)
+{
+	return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0, 0,
+				     AT803X_DEBUG_RX_CLK_DLY_EN);
+}
+
+static inline int at803x_enable_tx_delay(struct phy_device *phydev)
+{
+	return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5, 0,
+				     AT803X_DEBUG_TX_CLK_DLY_EN);
+}
+
 static inline int at803x_disable_rx_delay(struct phy_device *phydev)
 {
 	return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0,
@@ -255,18 +267,25 @@ static int at803x_config_init(struct phy_device *phydev)
 	if (ret < 0)
 		return ret;
 
-	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID ||
-			phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
-			phydev->interface == PHY_INTERFACE_MODE_RGMII) {
+	if (phydev->interface == PHY_INTERFACE_MODE_RGMII) {
 		ret = at803x_disable_rx_delay(phydev);
 		if (ret < 0)
 			return ret;
+		ret = at803x_disable_tx_delay(phydev);
+		if (ret < 0)
+			return ret;
+	};
+
+	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+			phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
+		ret = at803x_enable_rx_delay(phydev);
+		if (ret < 0)
+			return ret;
 	}
 
-	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID ||
-			phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
-			phydev->interface == PHY_INTERFACE_MODE_RGMII) {
-		ret = at803x_disable_tx_delay(phydev);
+	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+			phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
+		ret = at803x_enable_tx_delay(phydev);
 		if (ret < 0)
 			return ret;
 	}
-- 
2.20.1