netdev - [PATCH net-next 6/9] net: phy: icplus: don't set APS

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Date:   Tue,  9 Feb 2021 17:40:48 +0100
From:   Michael Walle <michael@...le.cc>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Michael Walle <michael@...le.cc>
Subject: [PATCH net-next 6/9] net: phy: icplus: don't set APS_EN bit on IP101G

This bit is reserved as 'always-write-1'. While this is not a particular
error, because we are only setting it, guard it by checking the model to
prevent errors in the future.

Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/net/phy/icplus.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/phy/icplus.c b/drivers/net/phy/icplus.c
index 189a9a34ed5f..a6e1c7611f15 100644
--- a/drivers/net/phy/icplus.c
+++ b/drivers/net/phy/icplus.c
@@ -250,7 +250,7 @@ static int ip101a_g_probe(struct phy_device *phydev)
 static int ip101a_g_config_init(struct phy_device *phydev)
 {
 	struct ip101a_g_phy_priv *priv = phydev->priv;
-	int err, c;
+	int err;
 
 	/* configure the RXER/INTR_32 pin of the 32-pin IP101GR if needed: */
 	switch (priv->sel_intr32) {
@@ -280,11 +280,16 @@ static int ip101a_g_config_init(struct phy_device *phydev)
 		break;
 	}
 
-	/* Enable Auto Power Saving mode */
-	c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
-	c |= IP101A_G_APS_ON;
+	/* Enable Auto Power Saving mode on IP101A, on IP101G this bit is
+	 * reserved as 'write-one'.
+	 */
+	if (priv->model == IP101A) {
+		err = phy_set_bits(phydev, IP10XX_SPEC_CTRL_STATUS, IP101A_G_APS_ON);
+		if (err)
+			return err;
+	}
 
-	return phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
+	return 0;
 }
 
 static int ip101a_g_ack_interrupt(struct phy_device *phydev)
-- 
2.20.1