This is a note to let you know that I've just added the patch titled
net: fec: Fix FEC_ECR_EN1588 being cleared on link-down
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-fec-fix-fec_ecr_en1588-being-cleared-on-link-dow.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 801b99dbbb902793313c35d297698a2ea26a805e
Author: Csókás, Bence <csokas.bence@xxxxxxxxx>
Date: Wed Jun 19 14:31:11 2024 +0200
net: fec: Fix FEC_ECR_EN1588 being cleared on link-down
[ 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@xxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Link: https://lore.kernel.org/netdev/5fa9fadc-a89d-467a-aae9-c65469ff5fe1@xxxxxxx/
Signed-off-by: Csókás, Bence <csokas.bence@xxxxxxxxx>
Reviewed-by: Wei Fang <wei.fang@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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
