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net: fec: Restart PPS after link state change

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[ Upstream commit a1477dc87d ]

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: 6605b730c0 ("FEC: Add time stamping code and a PTP hardware clock")
Signed-off-by: Csókás, Bence <csokas.bence@prolan.hu>
Link: https://patch.msgid.link/20240924093705.2897329-1-csokas.bence@prolan.hu
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Csókás, Bence 2024-09-24 11:37:04 +02:00 committed by Greg Kroah-Hartman
parent e66e38d07b
commit dc5fb26416
3 changed files with 46 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/ethernet/freescale/fec.h
View File

@ -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,

11
drivers/net/ethernet/freescale/fec_main.c
View File

@ -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);
}
}

30
drivers/net/ethernet/freescale/fec_ptp.c
View File

@ -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);