linux-kernel - [RFC net-next PATCH 11/16] net: macb: Support restarting PCS autonegotiation

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Date:   Mon,  4 Oct 2021 15:15:22 -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 11/16] net: macb: Support restarting PCS autonegotiation

This adds support for restarting autonegotiation using the internal PCS.

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

 drivers/net/ethernet/cadence/macb_main.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 08dcccd94f87..b938cdf4bb59 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -662,6 +662,21 @@ static int macb_pcs_config(struct phylink_pcs *pcs, unsigned int mode,
 	return changed;
 }
 
+static void macb_pcs_an_restart(struct phylink_pcs *pcs)
+{
+	struct macb *bp = pcs_to_macb(pcs);
+	u32 bmcr;
+	unsigned long flags;
+
+	spin_lock_irqsave(&bp->lock, flags);
+
+	bmcr = gem_readl(bp, PCSCNTRL);
+	bmcr |= BMCR_ANENABLE;
+	gem_writel(bp, PCSCNTRL, bmcr);
+
+	spin_lock_irqsave(&bp->lock, flags);
+}
+
 static void macb_usx_pcs_get_state(struct phylink_pcs *pcs,
 				   struct phylink_link_state *state)
 {
@@ -733,6 +748,7 @@ static const struct phylink_pcs_ops macb_phylink_usx_pcs_ops = {
 static const struct phylink_pcs_ops macb_phylink_pcs_ops = {
 	.pcs_get_state = macb_pcs_get_state,
 	.pcs_config = macb_pcs_config,
+	.pcs_an_restart = macb_pcs_an_restart,
 };
 
 static void macb_mac_config(struct phylink_config *config, unsigned int mode,
-- 
2.25.1