[PATCH 01/15] drivers: net: cpsw: fix suspend when all ethX devices are down

[Grygorii Strashko]

The cpsw_suspend() could trigger L3 error and CPSW will stop
functioning if System enters suspend when all ethX net-devices are
down - in this case CPSW could be already suspended by PM runtime, but
cpsw_suspend() will try to call soft_reset_slave() unconditionally
and access CPSW registers.

Hence, fix it by moving soft_reset_slave() from cpsw_suspend() to
cpsw_slave_stop(). This way slave ports will be reset when CPSW is
active and will be in proper state during Suspend.

Signed-off-by: Grygorii Strashko <grygorii.stras...@ti.com>
---
 drivers/net/ethernet/ti/cpsw.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index e6bb0ec..736c77a 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -1244,6 +1244,7 @@ static void cpsw_slave_stop(struct cpsw_slave *slave, 
struct cpsw_priv *priv)
        slave->phy = NULL;
        cpsw_ale_control_set(priv->ale, slave_port,
                             ALE_PORT_STATE, ALE_PORT_STATE_DISABLE);
+       soft_reset_slave(slave);
 }
 
 static int cpsw_ndo_open(struct net_device *ndev)
@@ -2558,12 +2559,10 @@ static int cpsw_suspend(struct device *dev)
                for (i = 0; i < priv->data.slaves; i++) {
                        if (netif_running(priv->slaves[i].ndev))
                                cpsw_ndo_stop(priv->slaves[i].ndev);
-                       soft_reset_slave(priv->slaves + i);
                }
        } else {
                if (netif_running(ndev))
                        cpsw_ndo_stop(ndev);
-               for_each_slave(priv, soft_reset_slave);
        }
 
        pm_runtime_put_sync(&pdev->dev);
-- 
2.8.4