[1/2] net: fec: Restart PPS after link state change

Commit Message

Csókás Bence Sept. 16, 2024, 2:19 p.m. UTC

On link state change, the controller gets reset,
causing PPS to drop out. Re-enable PPS if it was
enabled before the controller reset.

Signed-off-by: Csókás, Bence <[e-mail]>
---
 drivers/net/ethernet/freescale/fec.h      |  1 +
 drivers/net/ethernet/freescale/fec_main.c |  7 ++++++-
 drivers/net/ethernet/freescale/fec_ptp.c  | 12 ++++++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)

Comments

Paolo Abeni Sept. 19, 2024, 8:18 a.m. UTC | #1

On 9/16/24 16:19, Csókás, Bence wrote:
> On link state change, the controller gets reset,
> causing PPS to drop out. Re-enable PPS if it was
> enabled before the controller reset.
> 
> Signed-off-by: Csókás, Bence <[e-mail]>

This and the next patch look like a bugfix, as such they should target 
the 'net' tree:

https://elixir.bootlin.com/linux/v6.11/source/Documentation/process/maintainer-netdev.rst#L64

and you should include suitable fixes tag in each of them.

Thanks,

Paolo

Patch

diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index a19cb2a786fd..afa0bfb974e6 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -695,6 +695,7 @@  struct fec_enet_private {
 };
 
 void fec_ptp_init(struct platform_device *pdev, int irq_idx);
+void fec_ptp_restore_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 a923cb95cdc6..531b51091e7d 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1244,8 +1244,10 @@  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)
@@ -1366,6 +1368,9 @@  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 e32f6724f568..c5b89352373a 100644
--- a/drivers/net/ethernet/freescale/fec_ptp.c
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -770,6 +770,18 @@  void fec_ptp_init(struct platform_device *pdev, int irq_idx)
 	schedule_delayed_work(&fep->time_keep, HZ);
 }
 
+/* Restore PTP functionality after a reset */
+void fec_ptp_restore_state(struct fec_enet_private *fep)
+{
+	/* Restart PPS if needed */
+	if (fep->pps_enable) {
+		/* Reset turned it off, so adjust our status flag */
+		fep->pps_enable = 0;
+		/* 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);