On Mon, Dec 26, 2022 at 04:14:25PM +0900, Yoshihiro Shimoda wrote:
> Some Ethernet PHYs (like marvell10g) will decide the host interface
> mode by the media-side speed. So, the rswitch driver needs to
> initialize one of the Ethernet SERDES (r8a779f0-eth-serdes) ports
> after linked the Ethernet PHY up. The r8a779f0-eth-serdes driver has
> .init() for initializing all ports and .power_on() for initializing
> each port. So, add phy_power_{on,off} calling for it.
>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> ---
> drivers/net/ethernet/renesas/rswitch.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
> index ca79ee168206..2f335c95f5a8 100644
> --- a/drivers/net/ethernet/renesas/rswitch.c
> +++ b/drivers/net/ethernet/renesas/rswitch.c
> @@ -1180,6 +1180,10 @@ static void rswitch_mac_link_down(struct phylink_config *config,
> unsigned int mode,
> phy_interface_t interface)
> {
> + struct net_device *ndev = to_net_dev(config->dev);
> + struct rswitch_device *rdev = netdev_priv(ndev);
> +
> + phy_power_off(rdev->serdes);
> }
>
> static void rswitch_mac_link_up(struct phylink_config *config,
> @@ -1187,7 +1191,11 @@ static void rswitch_mac_link_up(struct phylink_config *config,
> phy_interface_t interface, int speed,
> int duplex, bool tx_pause, bool rx_pause)
> {
> + struct net_device *ndev = to_net_dev(config->dev);
> + struct rswitch_device *rdev = netdev_priv(ndev);
> +
> /* Current hardware cannot change speed at runtime */
> + phy_power_on(rdev->serdes);
> }
>
> static const struct phylink_mac_ops rswitch_phylink_ops = {
This looks to me like it will break anyone using an in-band link,
where the link status comes from the PCS behind the series that
you're now powering down and up.
--
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