Re: [PATCH net-next 2/2] net: phy: add Rust reference driver for ET1011C

[Andrew Lunn <andrew@lunn.ch>]

> +    fn read_status(dev: &mut phy::Device) -> Result<u16> {
> +        dev.genphy_read_status::<C22>()?;
> +
> +        let val = dev.read(ET1011C_STATUS_REG)?;
> +        if (val & ET1011C_SPEED_MASK) == ET1011C_GIGABIT_SPEED {
> +            let cfg = dev.read(ET1011C_CONFIG_REG)?;
> +            let cfg = cfg & !ET1011C_TX_FIFO_MASK;
> +            dev.write(
> +                ET1011C_CONFIG_REG,
> +                cfg | ET1011C_GMII_INTERFACE | ET1011C_SYS_CLK_EN | ET1011C_TX_FIFO_DEPTH_16,
> +            )?;
> +        }

This is not the same as the C code. read_status() will be called once
per second. The C code only does the read/modify/write when the speed
reported by genphy_read_status() is different to the previous
value. This code appears to do it every second.

       Andrew