Re: [PATCH] net: dsa: mv88e6xxx: Wait for EEPROM done after HW reset

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On Fri, Sep 13, 2019 at 11:24:24PM -0700, Andrey Smirnov wrote:
> Based on a unpublished patch from Andrew Lunn:
> 
>     The the switch is hardware reset, it reads the contents of the
>     EEPROM.

Could you correct this sentence to make its meaning clear?

>     This can contain instructions for programming values into
>     registers and to perform waits between such programming. Reading
>     the EEPROM can take longer than the 100ms
>     mv88e6xxx_hardware_reset() waits after deasserting the reset
>     GPIO. So poll the EEPROM done bit to ensure it is complete.
> 
>     Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
> 
> @@ -836,6 +865,11 @@ static int mv88e6xxx_probe(struct device_d *dev)
>  		 */
>  		mv88e6xxx_hardware_reset_delay();
>  	}
> +	/*
> +	 * Switch will not retrun valid data over MDIO until EEPROM is
> +	 * loaded

s/retrun/return/

> +	 */
> +	mv88e6xxx_g1_wait_eeprom_done(chip);
>  
>  	err = mv88e6xxx_detect(chip);
>  	if (err)
> +void mv88e6xxx_g1_wait_eeprom_done(struct mv88e6xxx_chip *chip)
> +{
> +	const uint64_t start   = get_time_ns();
> +	const uint64_t timeout = 20 * SECOND;
> +	u16 val;
> +	int err;
> +
> +	/* Wait up to 1 second for the switch to finish reading the
> +	 * EEPROM.
> +	 */
> +	while (!is_timeout(start, timeout)) {
> +		err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_STS, &val);
> +		if (err) {
> +			dev_err(chip->dev, "Error reading status");
> +			return;
> +		}
> +
> +		if (val != 0xFFFF && /* switch will return 0xffff it it */

This comment looks incomplete.

> +		    val & BIT(MV88E6XXX_G1_STS_IRQ_EEPROM_DONE))
> +			return;
> +

Sascha

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