[PATCH v2 1/2] net: stmmac: fix pinctrl management during suspend/resume

[Christophe Roullier <christophe.roullier@foss.st.com>]

In the deepest low-power modes, the pinctrl configuration is lost
and is never restored if the interface is down.
This commit ensures that the pinctrl state is set in all cases.

Signed-off-by: Christophe Roullier <christophe.roullier@foss.st.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 11150bddd8726..26ac1cdc561c2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -8150,8 +8150,11 @@ int stmmac_suspend(struct device *dev)
 	struct stmmac_priv *priv = netdev_priv(ndev);
 	u8 chan;
 
-	if (!ndev || !netif_running(ndev))
+	if (!ndev || !netif_running(ndev)) {
+		/* Select sleep pin state */
+		pinctrl_pm_select_sleep_state(dev);
 		goto suspend_bsp;
+	}
 
 	mutex_lock(&priv->lock);
 
@@ -8252,8 +8255,11 @@ int stmmac_resume(struct device *dev)
 			return ret;
 	}
 
-	if (!netif_running(ndev))
+	if (!netif_running(ndev)) {
+		/* Select default pin state */
+		pinctrl_pm_select_default_state(priv->device);
 		return 0;
+	}
 
 	/* Power Down bit, into the PM register, is cleared
 	 * automatically as soon as a magic packet or a Wake-up frame
-- 
2.43.0