netdev - [PATCH net-next v2 1/5] net: stmmac: dwc-qos: remove tegra_eqos

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Message-Id: <E1u3Vuf-000E7g-U4@rmk-PC.armlinux.org.uk>
Date: Sat, 12 Apr 2025 09:08:29 +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>,
	Jon Hunter <jonathanh@...dia.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Richard Cochran <richardcochran@...il.com>,
	Thierry Reding <treding@...dia.com>
Subject: [PATCH net-next v2 1/5] net: stmmac: dwc-qos: remove
 tegra_eqos_init()

tegra_eqos_init() initialises the 1US TIC counter for the EEE timers.
However, the DWGMAC core is reset after this write, which clears
this register to its default.

However, dwmac4_core_init() configures this register using the same
clock, which happens after reset - thus this is the write which
ensures that the register is correctly configured.

Therefore, tegra_eqos_init() is not required and is removed. This also
means eqos->clk_slave can also be removed.

Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 .../stmicro/stmmac/dwmac-dwc-qos-eth.c        | 24 +------------------
 1 file changed, 1 insertion(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
index 5db318327d33..583b5c071cd1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
@@ -29,7 +29,6 @@ struct tegra_eqos {
 	void __iomem *regs;
 
 	struct reset_control *rst;
-	struct clk *clk_slave;
 
 	struct gpio_desc *reset;
 };
@@ -199,20 +198,6 @@ static void tegra_eqos_fix_speed(void *priv, int speed, unsigned int mode)
 	}
 }
 
-static int tegra_eqos_init(struct platform_device *pdev, void *priv)
-{
-	struct tegra_eqos *eqos = priv;
-	unsigned long rate;
-	u32 value;
-
-	rate = clk_get_rate(eqos->clk_slave);
-
-	value = (rate / 1000000) - 1;
-	writel(value, eqos->regs + GMAC_1US_TIC_COUNTER);
-
-	return 0;
-}
-
 static int tegra_eqos_probe(struct platform_device *pdev,
 			    struct plat_stmmacenet_data *plat_dat,
 			    struct stmmac_resources *res)
@@ -227,7 +212,6 @@ static int tegra_eqos_probe(struct platform_device *pdev,
 
 	eqos->dev = &pdev->dev;
 	eqos->regs = res->addr;
-	eqos->clk_slave = plat_dat->stmmac_clk;
 
 	if (!is_of_node(dev->fwnode))
 		goto bypass_clk_reset_gpio;
@@ -267,17 +251,11 @@ static int tegra_eqos_probe(struct platform_device *pdev,
 bypass_clk_reset_gpio:
 	plat_dat->fix_mac_speed = tegra_eqos_fix_speed;
 	plat_dat->set_clk_tx_rate = stmmac_set_clk_tx_rate;
-	plat_dat->init = tegra_eqos_init;
 	plat_dat->bsp_priv = eqos;
 	plat_dat->flags |= STMMAC_FLAG_SPH_DISABLE;
 
-	err = tegra_eqos_init(pdev, eqos);
-	if (err < 0)
-		goto reset;
-
 	return 0;
-reset:
-	reset_control_assert(eqos->rst);
+
 reset_phy:
 	gpiod_set_value(eqos->reset, 1);
 
-- 
2.30.2