Hi Oleksij,
On 10.06.2021 16:20, Oleksij Rempel wrote:
> Take over PHY power management, otherwise PHY framework will try to
> access ASIX MDIO bus before MAC resume was completed.
>
> Fixes: e532a096be0e ("net: usb: asix: ax88772: add phylib support")
> Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
> Reported-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> Reported-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> Suggested-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
This fixes the issues observed on my test systems. Thanks!
Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> ---
> drivers/net/usb/asix_devices.c | 43 ++++++++++------------------------
> 1 file changed, 12 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
> index 8a477171e8f5..aec97b021a73 100644
> --- a/drivers/net/usb/asix_devices.c
> +++ b/drivers/net/usb/asix_devices.c
> @@ -598,6 +598,9 @@ static void ax88772_suspend(struct usbnet *dev)
> struct asix_common_private *priv = dev->driver_priv;
> u16 medium;
>
> + if (netif_running(dev->net))
> + phy_stop(priv->phydev);
> +
> /* Stop MAC operation */
> medium = asix_read_medium_status(dev, 1);
> medium &= ~AX_MEDIUM_RE;
> @@ -605,14 +608,6 @@ static void ax88772_suspend(struct usbnet *dev)
>
> netdev_dbg(dev->net, "ax88772_suspend: medium=0x%04x\n",
> asix_read_medium_status(dev, 1));
> -
> - /* Preserve BMCR for restoring */
> - priv->presvd_phy_bmcr =
> - asix_mdio_read_nopm(dev->net, dev->mii.phy_id, MII_BMCR);
> -
> - /* Preserve ANAR for restoring */
> - priv->presvd_phy_advertise =
> - asix_mdio_read_nopm(dev->net, dev->mii.phy_id, MII_ADVERTISE);
> }
>
> static int asix_suspend(struct usb_interface *intf, pm_message_t message)
> @@ -626,39 +621,22 @@ static int asix_suspend(struct usb_interface *intf, pm_message_t message)
> return usbnet_suspend(intf, message);
> }
>
> -static void ax88772_restore_phy(struct usbnet *dev)
> -{
> - struct asix_common_private *priv = dev->driver_priv;
> -
> - if (priv->presvd_phy_advertise) {
> - /* Restore Advertisement control reg */
> - asix_mdio_write_nopm(dev->net, dev->mii.phy_id, MII_ADVERTISE,
> - priv->presvd_phy_advertise);
> -
> - /* Restore BMCR */
> - if (priv->presvd_phy_bmcr & BMCR_ANENABLE)
> - priv->presvd_phy_bmcr |= BMCR_ANRESTART;
> -
> - asix_mdio_write_nopm(dev->net, dev->mii.phy_id, MII_BMCR,
> - priv->presvd_phy_bmcr);
> -
> - priv->presvd_phy_advertise = 0;
> - priv->presvd_phy_bmcr = 0;
> - }
> -}
> -
> static void ax88772_resume(struct usbnet *dev)
> {
> + struct asix_common_private *priv = dev->driver_priv;
> int i;
>
> for (i = 0; i < 3; i++)
> if (!ax88772_hw_reset(dev, 1))
> break;
> - ax88772_restore_phy(dev);
> +
> + if (netif_running(dev->net))
> + phy_start(priv->phydev);
> }
>
> static void ax88772a_resume(struct usbnet *dev)
> {
> + struct asix_common_private *priv = dev->driver_priv;
> int i;
>
> for (i = 0; i < 3; i++) {
> @@ -666,7 +644,8 @@ static void ax88772a_resume(struct usbnet *dev)
> break;
> }
>
> - ax88772_restore_phy(dev);
> + if (netif_running(dev->net))
> + phy_start(priv->phydev);
> }
>
> static int asix_resume(struct usb_interface *intf)
> @@ -722,6 +701,8 @@ static int ax88772_init_phy(struct usbnet *dev)
> return ret;
> }
>
> + priv->phydev->mac_managed_pm = 1;
> +
> phy_attached_info(priv->phydev);
>
> return 0;
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
