linux-kernel - [PATCH net] net: sparx5: fix reconfiguration of PCS on link mode change

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Message-ID: <20240405-link-mode-reconfiguration-fix-v1-1-c1480bc2346a@microchip.com>
Date: Fri, 5 Apr 2024 11:53:15 +0200
From: Daniel Machon <daniel.machon@...rochip.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Lars Povlsen <lars.povlsen@...rochip.com>, "Steen
 Hegelund" <Steen.Hegelund@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
	Bjarni Jonasson <bjarni.jonasson@...rochip.com>
CC: <netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Steen Hegelund
	<steen.hegelund@...rochip.com>, Daniel Machon <daniel.machon@...rochip.com>
Subject: [PATCH net] net: sparx5: fix reconfiguration of PCS on link mode
 change

It was observed that the PCS would be misconfigured on link mode change,
if the negotiated link mode went from no-inband capabilities to in-band
capabilities. This bug appeared after the neg_mode change of phylink [1],
but is really due to the wrong config being used when reconfiguring the PCS.

Fix this by correctly using the new port configuration instead of the old
one.

[1] https://lore.kernel.org/netdev/ZIxQIBfO9dH5xFlg@shell.armlinux.org.uk/

Fixes: 946e7fd5053a ("net: sparx5: add port module support")
Signed-off-by: Daniel Machon <daniel.machon@...rochip.com>
---
 drivers/net/ethernet/microchip/sparx5/sparx5_port.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_port.c b/drivers/net/ethernet/microchip/sparx5/sparx5_port.c
index 3a1b1a1f5a19..60dd2fd603a8 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_port.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_port.c
@@ -731,7 +731,7 @@ static int sparx5_port_pcs_low_set(struct sparx5 *sparx5,
 	bool sgmii = false, inband_aneg = false;
 	int err;
 
-	if (port->conf.inband) {
+	if (conf->inband) {
 		if (conf->portmode == PHY_INTERFACE_MODE_SGMII ||
 		    conf->portmode == PHY_INTERFACE_MODE_QSGMII)
 			inband_aneg = true; /* Cisco-SGMII in-band-aneg */
@@ -948,7 +948,7 @@ int sparx5_port_pcs_set(struct sparx5 *sparx5,
 	if (err)
 		return -EINVAL;
 
-	if (port->conf.inband) {
+	if (conf->inband) {
 		/* Enable/disable 1G counters in ASM */
 		spx5_rmw(ASM_PORT_CFG_CSC_STAT_DIS_SET(high_speed_dev),
 			 ASM_PORT_CFG_CSC_STAT_DIS,

---
base-commit: d76c740b2eaaddc5fc3a8b21eaec5b6b11e8c3f5
change-id: 20240305-link-mode-reconfiguration-fix-df961fef5505

Best regards,
-- 
Daniel Machon <daniel.machon@...rochip.com>