On 29.04.2020 11:03, Badel, Laurent wrote:
> Description: this patch adds a reset of the PHY in phy_init_hw() 
> for PHY drivers bearing the PHY_RST_AFTER_CLK_EN flag.
> 
> Rationale: due to the PHY reset reverting the interrupt mask to default, 
> it is necessary to either perform the reset before PHY configuration, 
> or re-configure the PHY after reset. This patch implements the former
> as it is simpler and more generic. 
> 
> Fixes: 1b0a83ac04e383e3bed21332962b90710fcf2828 ("net: fec: add 
> phy_reset_after_clk_enable() support")
> Signed-off-by: Laurent Badel <laurentba...@eaton.com>
> 
> ---
>  drivers/net/phy/phy_device.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index 28e3c5c0e..2cc511364 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -1082,8 +1082,11 @@ int phy_init_hw(struct phy_device *phydev)
>  {
>       int ret = 0;
>  
> -     /* Deassert the reset signal */
> -     phy_device_reset(phydev, 0);
> +     /* Deassert the reset signal
> +      * If the PHY needs a reset, do it now
> +      */
> +     if (!phy_reset_after_clk_enable(phydev))

If reset is asserted when entering phy_init_hw(), then
phy_reset_after_clk_enable() basically becomes a no-op.
Still it should work as expected due to the reset signal being
deasserted. It would be worth describing in the comment
why the code still works in this case.

> +             phy_device_reset(phydev, 0);
>  
>       if (!phydev->drv)
>               return 0;
> 

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