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Subject[PATCH net-next] net: fec: add pm runtime force suspend and resume support
Date
From: Wei Fang <wei.fang@nxp.com>

Force mii bus into runtime pm suspend state during device suspends,
since phydev state is already PHY_HALTED, and there is no need to
access mii bus during device suspend state. Then force mii bus into
runtime pm resume state when device resumes.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
---
drivers/net/ethernet/freescale/fec.h | 1 +
drivers/net/ethernet/freescale/fec_main.c | 13 +++++++++++++
2 files changed, 14 insertions(+)

diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index 0cebe4b63adb..521f60c7f2e0 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -579,6 +579,7 @@ struct fec_enet_private {
struct device_node *phy_node;
bool rgmii_txc_dly;
bool rgmii_rxc_dly;
+ bool rpm_active;
int link;
int full_duplex;
int speed;
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 7211597d323d..13210b216ee4 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -4092,6 +4092,7 @@ static int __maybe_unused fec_suspend(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct fec_enet_private *fep = netdev_priv(ndev);
+ int ret;

rtnl_lock();
if (netif_running(ndev)) {
@@ -4116,6 +4117,15 @@ static int __maybe_unused fec_suspend(struct device *dev)
}
/* It's safe to disable clocks since interrupts are masked */
fec_enet_clk_enable(ndev, false);
+
+ fep->rpm_active = !pm_runtime_status_suspended(dev);
+ if (fep->rpm_active) {
+ ret = pm_runtime_force_suspend(dev);
+ if (ret < 0) {
+ rtnl_unlock();
+ return ret;
+ }
+ }
}
rtnl_unlock();

@@ -4146,6 +4156,9 @@ static int __maybe_unused fec_resume(struct device *dev)

rtnl_lock();
if (netif_running(ndev)) {
+ if (fep->rpm_active)
+ pm_runtime_force_resume(dev);
+
ret = fec_enet_clk_enable(ndev, true);
if (ret) {
rtnl_unlock();
--
2.25.1
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