linux-kernel - [RFC net-next PATCH 12/16] net: macb: Support external PCSs

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Date:   Mon,  4 Oct 2021 15:15:23 -0400
From:   Sean Anderson <sean.anderson@...o.com>
To:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Sean Anderson <sean.anderson@...o.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>
Subject: [RFC net-next PATCH 12/16] net: macb: Support external PCSs

This adds support for using an external PCS. If someone else has set the
PCS beforehand, then we will use it instead of the internal PCS.

Signed-off-by: Sean Anderson <sean.anderson@...o.com>
---

 drivers/net/ethernet/cadence/macb_main.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index b938cdf4bb59..7e9fd12c09c8 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -862,7 +862,7 @@ static int macb_mac_prepare(struct phylink_config *config, unsigned int mode,
 	}
 
 	if (set_pcs)
-		phylink_set_pcs(bp->phylink, &bp->phylink_pcs);
+		set_pcs = phylink_set_pcs_weak(bp->phylink, &bp->phylink_pcs);
 
 	spin_lock_irqsave(&bp->lock, flags);
 
@@ -877,8 +877,11 @@ static int macb_mac_prepare(struct phylink_config *config, unsigned int mode,
 		ncr |= MACB_BIT(MIIONRGMII);
 	}
 
-	if (macb_is_gem(bp) && set_pcs)
-		ctrl |= GEM_BIT(PCSSEL);
+	if (macb_is_gem(bp)) {
+		ctrl &= ~GEM_BIT(PCSSEL);
+		if (set_pcs)
+			ctrl |= GEM_BIT(PCSSEL);
+	}
 
 	/* Apply the new configuration, if any */
 	if (old_ctrl ^ ctrl)
-- 
2.25.1