[PATCH RFC net-next 5/5] net: stmmac: fix resume when media is in low-power mode

[Andrew Lunn]

On Thu, Feb 27, 2025 at 02:38:08PM +0000, Russell King (Oracle) wrote:
> The Synopsys Designwavre GMAC core databook requires all clocks to be
> active in order to complete software reset.
> 
> This means if the PHY receive clock has been stopped due to the media
> being in EEE low-power state, and the PHY being permitted to stop its
> clock, then software reset will not complete.
> 
> Phylink now provides a way to work around this by calling
> phylink_prepare_resume() before attempting to issue a reset. This will
> prepare any attached PHY by disabling its permission to stop the clock.
> phylink_resume() will restore the receive clock stop setting according
> to the configuration passed from the netdev driver.
> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel at armlinux.org.uk>

Reviewed-by: Andrew Lunn <andrew at lunn.ch>

    Andrew