6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Csókás, Bence <csokas.bence@xxxxxxxxx>
[ Upstream commit a1477dc87dc4996dcf65a4893d4e2c3a6b593002 ]
On link state change, the controller gets reset,
causing PPS to drop out. Re-enable PPS if it was
enabled before the controller reset.
Fixes: 6605b730c061 ("FEC: Add time stamping code and a PTP hardware clock")
Signed-off-by: Csókás, Bence <csokas.bence@xxxxxxxxx>
Link: https://patch.msgid.link/20240924093705.2897329-1-csokas.bence@xxxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/freescale/fec.h | 6 +++++
drivers/net/ethernet/freescale/fec_main.c | 11 ++++++++-
drivers/net/ethernet/freescale/fec_ptp.c | 30 +++++++++++++++++++++++
3 files changed, 46 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index a8fbcada6b01f..cb58696ec03b2 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -691,10 +691,16 @@ struct fec_enet_private {
/* XDP BPF Program */
struct bpf_prog *xdp_prog;
+ struct {
+ int pps_enable;
+ } ptp_saved_state;
+
u64 ethtool_stats[];
};
void fec_ptp_init(struct platform_device *pdev, int irq_idx);
+void fec_ptp_restore_state(struct fec_enet_private *fep);
+void fec_ptp_save_state(struct fec_enet_private *fep);
void fec_ptp_stop(struct platform_device *pdev);
void fec_ptp_start_cyclecounter(struct net_device *ndev);
int fec_ptp_set(struct net_device *ndev, struct kernel_hwtstamp_config *config,
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 5604a47b35b2a..81e3173521589 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1058,6 +1058,8 @@ fec_restart(struct net_device *ndev)
u32 rcntl = OPT_FRAME_SIZE | 0x04;
u32 ecntl = FEC_ECR_ETHEREN;
+ fec_ptp_save_state(fep);
+
/* Whack a reset. We should wait for this.
* For i.MX6SX SOC, enet use AXI bus, we use disable MAC
* instead of reset MAC itself.
@@ -1225,8 +1227,10 @@ fec_restart(struct net_device *ndev)
writel(ecntl, fep->hwp + FEC_ECNTRL);
fec_enet_active_rxring(ndev);
- if (fep->bufdesc_ex)
+ if (fep->bufdesc_ex) {
fec_ptp_start_cyclecounter(ndev);
+ fec_ptp_restore_state(fep);
+ }
/* Enable interrupts we wish to service */
if (fep->link)
@@ -1317,6 +1321,8 @@ fec_stop(struct net_device *ndev)
netdev_err(ndev, "Graceful transmit stop did not complete!\n");
}
+ fec_ptp_save_state(fep);
+
/* Whack a reset. We should wait for this.
* For i.MX6SX SOC, enet use AXI bus, we use disable MAC
* instead of reset MAC itself.
@@ -1347,6 +1353,9 @@ fec_stop(struct net_device *ndev)
val = readl(fep->hwp + FEC_ECNTRL);
val |= FEC_ECR_EN1588;
writel(val, fep->hwp + FEC_ECNTRL);
+
+ fec_ptp_start_cyclecounter(ndev);
+ fec_ptp_restore_state(fep);
}
}
diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c
index 2e4f3e1782a25..8027b532de078 100644
--- a/drivers/net/ethernet/freescale/fec_ptp.c
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -770,6 +770,36 @@ void fec_ptp_init(struct platform_device *pdev, int irq_idx)
schedule_delayed_work(&fep->time_keep, HZ);
}
+void fec_ptp_save_state(struct fec_enet_private *fep)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&fep->tmreg_lock, flags);
+
+ fep->ptp_saved_state.pps_enable = fep->pps_enable;
+
+ spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+}
+
+/* Restore PTP functionality after a reset */
+void fec_ptp_restore_state(struct fec_enet_private *fep)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&fep->tmreg_lock, flags);
+
+ /* Reset turned it off, so adjust our status flag */
+ fep->pps_enable = 0;
+
+ spin_unlock_irqrestore(&fep->tmreg_lock, flags);
+
+ /* Restart PPS if needed */
+ if (fep->ptp_saved_state.pps_enable) {
+ /* Re-enable PPS */
+ fec_ptp_enable_pps(fep, 1);
+ }
+}
+
void fec_ptp_stop(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
--
2.43.0
