5.4-stable review patch. If anyone has any objections, please let me know.
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From: Csókás, Bence csokas.bence@prolan.hu
[ Upstream commit c32fe1986f27cac329767d3497986e306cad1d5e ]
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: 6605b730c061 ("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 --- drivers/net/ethernet/freescale/fec_main.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index cf8426bb6411b..f11824a078e9e 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -1205,6 +1205,12 @@ fec_stop(struct net_device *ndev) writel(FEC_ECR_ETHEREN, fep->hwp + FEC_ECNTRL); 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