diff mbox series

[5.10.y-cip,39/47] net: ravb: Do not apply features to hardware if the interface is down

Message ID 20240529081039.639010-40-claudiu.beznea.uj@bp.renesas.com (mailing list archive)
State New
Headers show
Series Add Ethernet support for Renesas RZ/G3S SoC | expand

Commit Message

Claudiu Beznea May 29, 2024, 8:10 a.m. UTC 
From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

commit a71a50e391bf00fdc88bb13a867620c59ad744da upstream.

Do not apply features to hardware if the interface is down. In case runtime
PM is enabled, and while the interface is down, the IP will be in reset
mode (as for some platforms disabling the clocks will switch the IP to
reset mode, which will lead to losing register contents) and applying
settings in reset mode is not an option. Instead, cache the features and
apply them in ravb_open() through ravb_emac_init().

To avoid accessing the hardware while the interface is down
pm_runtime_active() check was introduced. Along with it the device runtime
PM usage counter has been incremented to avoid disabling the device clocks
while the check is in progress (if any).

Commit prepares for the addition of runtime PM.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---
 drivers/net/ethernet/renesas/ravb_main.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 2324b2dd59a5..a9046c620808 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2578,9 +2578,18 @@  static int ravb_set_features(struct net_device *ndev,
 {
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
+	struct device *dev = &priv->pdev->dev;
 	int ret;
 
-	ret = info->set_feature(ndev, features);
+	pm_runtime_get_noresume(dev);
+
+	if (pm_runtime_active(dev))
+		ret = info->set_feature(ndev, features);
+	else
+		ret = 0;
+
+	pm_runtime_put_noidle(dev);
+
 	if (ret)
 		return ret;