netdev - [PATCH net-next v2] net: stmmac: visconti: convert to set_clk_tx

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Message-Id: <E1u4zJ0-000xEX-TZ@rmk-PC.armlinux.org.uk>
Date: Wed, 16 Apr 2025 10:43:42 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next v2] net: stmmac: visconti: convert to
 set_clk_tx_rate() method

Convert visconti to use the set_clk_tx_rate() method. By doing so,
the GMAC control register will already have been updated (unlike with
the fix_mac_speed() method) so this code can be removed while porting
to the set_clk_tx_rate() method.

There is also no need for the spinlock, and has never been - neither
fix_mac_speed() nor set_clk_tx_rate() can be called by more than one
thread at a time, so the lock does nothing useful.

Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
v2: add Andrew's r-b (he doesn't mind it being preserved for simple fixes)
fix build errors.

 .../ethernet/stmicro/stmmac/dwmac-visconti.c  | 23 +++++--------------
 1 file changed, 6 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c
index 33cf99797df5..3d08bc9f6854 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c
@@ -51,21 +51,14 @@ struct visconti_eth {
 	u32 phy_intf_sel;
 	struct clk *phy_ref_clk;
 	struct device *dev;
-	spinlock_t lock; /* lock to protect register update */
 };
 
-static void visconti_eth_fix_mac_speed(void *priv, int speed, unsigned int mode)
+static int visconti_eth_set_clk_tx_rate(void *bsp_priv, struct clk *clk_tx_i,
+					phy_interface_t interface, int speed)
 {
-	struct visconti_eth *dwmac = priv;
+	struct visconti_eth *dwmac = bsp_priv;
 	struct net_device *netdev = dev_get_drvdata(dwmac->dev);
 	unsigned int val, clk_sel_val = 0;
-	unsigned long flags;
-
-	spin_lock_irqsave(&dwmac->lock, flags);
-
-	/* adjust link */
-	val = readl(dwmac->reg + MAC_CTRL_REG);
-	val &= ~(GMAC_CONFIG_PS | GMAC_CONFIG_FES);
 
 	switch (speed) {
 	case SPEED_1000:
@@ -89,12 +82,9 @@ static void visconti_eth_fix_mac_speed(void *priv, int speed, unsigned int mode)
 	default:
 		/* No bit control */
 		netdev_err(netdev, "Unsupported speed request (%d)", speed);
-		spin_unlock_irqrestore(&dwmac->lock, flags);
-		return;
+		return -EINVAL;
 	}
 
-	writel(val, dwmac->reg + MAC_CTRL_REG);
-
 	/* Stop internal clock */
 	val = readl(dwmac->reg + REG_ETHER_CLOCK_SEL);
 	val &= ~(ETHER_CLK_SEL_RMII_CLK_EN | ETHER_CLK_SEL_RX_TX_CLK_EN);
@@ -136,7 +126,7 @@ static void visconti_eth_fix_mac_speed(void *priv, int speed, unsigned int mode)
 		break;
 	}
 
-	spin_unlock_irqrestore(&dwmac->lock, flags);
+	return 0;
 }
 
 static int visconti_eth_init_hw(struct platform_device *pdev, struct plat_stmmacenet_data *plat_dat)
@@ -228,11 +218,10 @@ static int visconti_eth_dwmac_probe(struct platform_device *pdev)
 	if (!dwmac)
 		return -ENOMEM;
 
-	spin_lock_init(&dwmac->lock);
 	dwmac->reg = stmmac_res.addr;
 	dwmac->dev = &pdev->dev;
 	plat_dat->bsp_priv = dwmac;
-	plat_dat->fix_mac_speed = visconti_eth_fix_mac_speed;
+	plat_dat->set_clk_tx_rate = visconti_eth_set_clk_tx_rate;
 
 	ret = visconti_eth_clock_probe(pdev, plat_dat);
 	if (ret)
-- 
2.30.2