linux-kernel - [net PATCH 1/2] net: dsa: qca8k: fix internal delay applied to the wrong PAD config

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Message-Id: <20211119020350.32324-1-ansuelsmth@gmail.com>
Date:   Fri, 19 Nov 2021 03:03:49 +0100
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Ansuel Smith <ansuelsmth@...il.com>,
        Jonathan McDowell <noodles@...th.li>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [net PATCH 1/2] net: dsa: qca8k: fix internal delay applied to the wrong PAD config

With SGMII phy the internal delay is always applied to the PAD0 config.
This is caused by the falling edge configuration that hardcode the reg
to PAD0 (as the falling edge bits are present only in PAD0 reg)
Move the delay configuration before the reg overwrite to correctly apply
the delay.

Fixes: cef08115846e ("net: dsa: qca8k: set internal delay also for sgmii")
Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 drivers/net/dsa/qca8k.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index a429c9750add..d7bcecbc1c53 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -1433,6 +1433,12 @@ qca8k_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
 
 		qca8k_write(priv, QCA8K_REG_SGMII_CTRL, val);
 
+		/* From original code is reported port instability as SGMII also
+		 * require delay set. Apply advised values here or take them from DT.
+		 */
+		if (state->interface == PHY_INTERFACE_MODE_SGMII)
+			qca8k_mac_config_setup_internal_delay(priv, cpu_port_index, reg);
+
 		/* For qca8327/qca8328/qca8334/qca8338 sgmii is unique and
 		 * falling edge is set writing in the PORT0 PAD reg
 		 */
@@ -1455,12 +1461,6 @@ qca8k_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
 					QCA8K_PORT0_PAD_SGMII_TXCLK_FALLING_EDGE,
 					val);
 
-		/* From original code is reported port instability as SGMII also
-		 * require delay set. Apply advised values here or take them from DT.
-		 */
-		if (state->interface == PHY_INTERFACE_MODE_SGMII)
-			qca8k_mac_config_setup_internal_delay(priv, cpu_port_index, reg);
-
 		break;
 	default:
 		dev_err(ds->dev, "xMII mode %s not supported for port %d\n",
-- 
2.32.0