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net: fec: Fix FEC_ECR_EN1588 being cleared on link-down

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[ Upstream commit c32fe1986f ]

FEC_ECR_EN1588 bit gets cleared after MAC reset in `fec_stop()`, which
makes all 1588 functionality shut down, and all the extended registers
disappear, on link-down, making the adapter fall back to compatibility
"dumb mode". However, some functionality needs to be retained (e.g. PPS)
even without link.

Fixes: 6605b730c0 ("FEC: Add time stamping code and a PTP hardware clock")
Cc: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/netdev/5fa9fadc-a89d-467a-aae9-c65469ff5fe1@lunn.ch/
Signed-off-by: Csókás, Bence <csokas.bence@prolan.hu>
Reviewed-by: Wei Fang <wei.fang@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Csókás, Bence 2024-06-19 14:31:11 +02:00 committed by Greg Kroah-Hartman
parent e6c691f662
commit 16c5cb3280
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/freescale/fec_main.c
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@ -1342,6 +1342,12 @@ fec_stop(struct net_device *ndev)
writel(FEC_ECR_ETHEREN, fep->hwp + FEC_ECNTRL); writel(FEC_ECR_ETHEREN, fep->hwp + FEC_ECNTRL);
writel(rmii_mode, fep->hwp + FEC_R_CNTRL); writel(rmii_mode, fep->hwp + FEC_R_CNTRL);
} }
if (fep->bufdesc_ex) {
val = readl(fep->hwp + FEC_ECNTRL);
val |= FEC_ECR_EN1588;
writel(val, fep->hwp + FEC_ECNTRL);
}
} }
static void static void