[PATCH net] net: ethernet: ave: Fix MAC to be in charge of PHY PM

[PATCH net] net: ethernet: ave: Fix MAC to be in charge of PHY PM

[Kunihiko Hayashi]

The phylib callback is called after MAC driver's own resume callback is
called. For AVE driver, after resuming immediately, PHY state machine is
in PHY_NOLINK because there is a time lag from link-down to link-up due to
autoneg. The result is WARN_ON() dump in mdio_bus_phy_resume().

Since ave_resume() itself calls phy_resume(), AVE driver should manage
PHY PM. To indicate that MAC driver manages PHY PM, set
phydev->mac_managed_pm to true to avoid the unnecessary phylib call and
add missing phy_init_hw() to ave_resume().

Suggested-by: Heiner Kallweit <hkallweit1@gmail.com>
Fixes: fba863b81604 ("net: phy: make PHY PM ops a no-op if MAC driver manages PHY PM")
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
---
 drivers/net/ethernet/socionext/sni_ave.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/socionext/sni_ave.c b/drivers/net/ethernet/socionext/sni_ave.c
index 1fa09b49ba7f..d2c6a5dfdc0e 100644
--- a/drivers/net/ethernet/socionext/sni_ave.c
+++ b/drivers/net/ethernet/socionext/sni_ave.c
@@ -1229,6 +1229,8 @@ static int ave_init(struct net_device *ndev)
 
 	phy_support_asym_pause(phydev);
 
+	phydev->mac_managed_pm = true;
+
 	phy_attached_info(phydev);
 
 	return 0;
@@ -1756,6 +1758,10 @@ static int ave_resume(struct device *dev)
 
 	ave_global_reset(ndev);
 
+	ret = phy_init_hw(ndev->phydev);
+	if (ret)
+		return ret;
+
 	ave_ethtool_get_wol(ndev, &wol);
 	wol.wolopts = priv->wolopts;
 	__ave_ethtool_set_wol(ndev, &wol);
-- 
2.25.1

Re: [PATCH net] net: ethernet: ave: Fix MAC to be in charge of PHY PM

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 24 Oct 2022 16:22:27 +0900 you wrote:
> The phylib callback is called after MAC driver's own resume callback is
> called. For AVE driver, after resuming immediately, PHY state machine is
> in PHY_NOLINK because there is a time lag from link-down to link-up due to
> autoneg. The result is WARN_ON() dump in mdio_bus_phy_resume().
> 
> Since ave_resume() itself calls phy_resume(), AVE driver should manage
> PHY PM. To indicate that MAC driver manages PHY PM, set
> phydev->mac_managed_pm to true to avoid the unnecessary phylib call and
> add missing phy_init_hw() to ave_resume().
> 
> [...]

Here is the summary with links:
  - [net] net: ethernet: ave: Fix MAC to be in charge of PHY PM
    https://git.kernel.org/netdev/net/c/e2badb4bd33a

You are awesome, thank you!
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