Re: [PATCH net] net: dsa: mv88e6xx: fix supported_interfaces setup in mv88e6250_phylink_get_caps()

From: Russell King (Oracle)
Date: Tue Apr 16 2024 - 12:56:39 EST


On Tue, Apr 16, 2024 at 05:50:54PM +0200, Matthias Schiffer wrote:
> +int mv88e6250_port_get_mode(struct mv88e6xxx_chip *chip, int port,
> + phy_interface_t *mode)
> +{
> + int err;
> + u16 reg;
> +
> + if (port < 5) {
> + *mode = PHY_INTERFACE_MODE_INTERNAL;
> + return 0;
> + }

Note that if mv88e6xxx_phy_is_internal() returns TRUE for the port,
then this will be handled automatically.

> +
> + err = mv88e6xxx_port_read(chip, port, MV88E6XXX_PORT_STS, &reg);
> + if (err)
> + return err;
> +
> + switch (reg & MV88E6250_PORT_STS_PORTMODE_MASK) {
> + case MV88E6250_PORT_STS_PORTMODE_MII_10_HALF_PHY:
> + case MV88E6250_PORT_STS_PORTMODE_MII_100_HALF_PHY:
> + case MV88E6250_PORT_STS_PORTMODE_MII_10_FULL_PHY:
> + case MV88E6250_PORT_STS_PORTMODE_MII_100_FULL_PHY:
> + *mode = PHY_INTERFACE_MODE_REVMII;
> + break;
> +
> + case MV88E6250_PORT_STS_PORTMODE_MII_HALF:
> + case MV88E6250_PORT_STS_PORTMODE_MII_FULL:
> + *mode = PHY_INTERFACE_MODE_MII;
> + break;
> +
> + case MV88E6250_PORT_STS_PORTMODE_MII_DUAL_100_RMII_FULL_PHY:
> + case MV88E6250_PORT_STS_PORTMODE_MII_200_RMII_FULL_PHY:
> + case MV88E6250_PORT_STS_PORTMODE_MII_10_100_RMII_HALF_PHY:
> + case MV88E6250_PORT_STS_PORTMODE_MII_10_100_RMII_FULL_PHY:
> + *mode = PHY_INTERFACE_MODE_REVRMII;
> + break;
> +
> + case MV88E6250_PORT_STS_PORTMODE_MII_DUAL_100_RMII_FULL:
> + case MV88E6250_PORT_STS_PORTMODE_MII_10_100_RMII_FULL:
> + *mode = PHY_INTERFACE_MODE_RMII;
> + break;
> +
> + case MV88E6250_PORT_STS_PORTMODE_MII_100_RGMII:
> + *mode = PHY_INTERFACE_MODE_RGMII;
> + break;
> +
> + default:
> + *mode = PHY_INTERFACE_MODE_NA;

What does this mean? I don't allow PHY_INTERFACE_MODE_NA to be set in
the list of supported interfaces because it isn't an interface mode.
If it's invalid, then it's probably best to return an error.

I wonder whether it would just be better to pass the
supported_interfaces bitmap into this function and have it set the
appropriate bit itself, renaming the function to something more
better suited to that purpose.

Thanks.

--
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