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net: stmmac: dwc-qos: calibrate tegra with mdio bus idle

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Thierry states that there are prerequists for Tegra's calibration
that should be met before starting calibration - both the RGMII and
MDIO interfaces should be idle.

This commit adds the necessary MII bus locking to ensure that the MDIO
interface is idle during calibration.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://patch.msgid.link/E1u7EYR-001ZAS-Cr@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle) 2025-04-22 15:24:55 +01:00 committed by Jakub Kicinski
parent 8ff6175139
commit 87f43e6f06
1 changed files with 10 additions and 2 deletions
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12
drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
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@ -136,10 +136,11 @@ static int dwc_qos_probe(struct platform_device *pdev,
#define AUTO_CAL_STATUS 0x880c
#define AUTO_CAL_STATUS_ACTIVE BIT(31)
static void tegra_eqos_fix_speed(void *priv, int speed, unsigned int mode)
static void tegra_eqos_fix_speed(void *bsp_priv, int speed, unsigned int mode)
{
struct tegra_eqos *eqos = priv;
struct tegra_eqos *eqos = bsp_priv;
bool needs_calibration = false;
struct stmmac_priv *priv;
u32 value;
int err;
@ -158,6 +159,11 @@ static void tegra_eqos_fix_speed(void *priv, int speed, unsigned int mode)
}
if (needs_calibration) {
priv = netdev_priv(dev_get_drvdata(eqos->dev));
/* Calibration should be done with the MDIO bus idle */
mutex_lock(&priv->mii->mdio_lock);
/* calibrate */
value = readl(eqos->regs + SDMEMCOMPPADCTRL);
value |= SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD;
@ -191,6 +197,8 @@ static void tegra_eqos_fix_speed(void *priv, int speed, unsigned int mode)
value = readl(eqos->regs + SDMEMCOMPPADCTRL);
value &= ~SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD;
writel(value, eqos->regs + SDMEMCOMPPADCTRL);
mutex_unlock(&priv->mii->mdio_lock);
} else {
value = readl(eqos->regs + AUTO_CAL_CONFIG);
value &= ~AUTO_CAL_CONFIG_ENABLE;