[PATCH] net: stmmac: linkup phy after enabled mac when system resume

From: Clark Wang
Date: Wed Oct 19 2022 - 08:55:47 EST


Here is an issue: after enabled the WoL function, EQoS cannot send and
receive data after resumed because of the wrong setting of
MAC_CONFIGURATION register.

When enable the WoL function, stmmac_resume will call stmmac_hw_setup
and phylink_resume.
- When do stmmac_hw_setup, it will reset the stmmac, and re-config the
register GMAC_CONFIG with a fixed default value GMAC_CORE_INIT.
- When do phylink_resume in stmmac_resume, it will call stmmac_mac_link_up in
a workqueue. stmmac_mac_link_up will set the correct speed/duplex states
provided by phy to the CONFIG register.

So when resume the stmmac, the workqueue of phylink_resume must be run after
the stmmac_hw_setup to ensure that the configuration of the CONFIG register
is correct.
In order to ensure this, put the place of phylink_resume consistent with
stmmac_open.
Make sure that stmmac_mac_link_up is called after stmmac_hw_setup even the
workqueue of phylink_resume is run immediately.

Signed-off-by: Clark Wang <xiaoning.wang@xxxxxxx>
---
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 20 +++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 65c96773c6d2..79c9ea451a81 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -7515,16 +7515,6 @@ int stmmac_resume(struct device *dev)
return ret;
}

- rtnl_lock();
- if (device_may_wakeup(priv->device) && priv->plat->pmt) {
- phylink_resume(priv->phylink);
- } else {
- phylink_resume(priv->phylink);
- if (device_may_wakeup(priv->device))
- phylink_speed_up(priv->phylink);
- }
- rtnl_unlock();
-
rtnl_lock();
mutex_lock(&priv->lock);

@@ -7539,6 +7529,16 @@ int stmmac_resume(struct device *dev)

stmmac_restore_hw_vlan_rx_fltr(priv, ndev, priv->hw);

+ mutex_unlock(&priv->lock);
+ if (device_may_wakeup(priv->device) && priv->plat->pmt) {
+ phylink_resume(priv->phylink);
+ } else {
+ phylink_resume(priv->phylink);
+ if (device_may_wakeup(priv->device))
+ phylink_speed_up(priv->phylink);
+ }
+ mutex_lock(&priv->lock);
+
stmmac_enable_all_queues(priv);
stmmac_enable_all_dma_irq(priv);

--
2.34.1