From: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
[ Upstream commit e6a41c23df0d5da01540d2abef41591589c0b4be ]
Because of autosuspend, at91ether_start is called with clocks disabled.
Ensure that pm_runtime doesn't suspend the interface as soon as it is
opened as there is no pm_runtime support is the other relevant parts of the
platform support for at91rm9200.
Fixes: d54f89af6cc4 ("net: macb: Add pm runtime support")
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
Reviewed-by: Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>
Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/cadence/macb_main.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 95a94507cec12..234c13ebbc41b 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -3690,6 +3690,10 @@ static int at91ether_open(struct net_device *dev)
u32 ctl;
int ret;
+ ret = pm_runtime_get_sync(&lp->pdev->dev);
+ if (ret < 0)
+ return ret;
+
/* Clear internal statistics */
ctl = macb_readl(lp, NCR);
macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT));
@@ -3750,7 +3754,7 @@ static int at91ether_close(struct net_device *dev)
q->rx_buffers, q->rx_buffers_dma);
q->rx_buffers = NULL;
- return 0;
+ return pm_runtime_put(&lp->pdev->dev);
}
/* Transmit packet */
--
2.20.1
