This is a note to let you know that I've just added the patch titled
net: ti: icssg-prueth: Fix clearing of IEP_CMP_CFG registers during iep_init
to the 6.12-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-ti-icssg-prueth-fix-clearing-of-iep_cmp_cfg-regi.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bb830e356c30baa20ec9d3002cdc0997cf160f3c
Author: Meghana Malladi <m-malladi@xxxxxx>
Date: Mon Dec 23 20:45:50 2024 +0530
net: ti: icssg-prueth: Fix clearing of IEP_CMP_CFG registers during iep_init
[ Upstream commit 9b115361248dc6cce182a2dc030c1c70b0a9639e ]
When ICSSG interfaces are brought down and brought up again, the
pru cores are shut down and booted again, flushing out all the memories
and start again in a clean state. Hence it is expected that the
IEP_CMP_CFG register needs to be flushed during iep_init() to ensure
that the existing residual configuration doesn't cause any unusual
behavior. If the register is not cleared, existing IEP_CMP_CFG set for
CMP1 will result in SYNC0_OUT signal based on the SYNC_OUT register values.
After bringing the interface up, calling PPS enable doesn't work as
the driver believes PPS is already enabled, (iep->pps_enabled is not
cleared during interface bring down) and driver will just return true
even though there is no signal. Fix this by disabling pps and perout.
Fixes: c1e0230eeaab ("net: ti: icss-iep: Add IEP driver")
Signed-off-by: Meghana Malladi <m-malladi@xxxxxx>
Reviewed-by: Roger Quadros <rogerq@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/ti/icssg/icss_iep.c b/drivers/net/ethernet/ti/icssg/icss_iep.c
index 5d6d1cf78e93..768578c0d958 100644
--- a/drivers/net/ethernet/ti/icssg/icss_iep.c
+++ b/drivers/net/ethernet/ti/icssg/icss_iep.c
@@ -215,6 +215,9 @@ static void icss_iep_enable_shadow_mode(struct icss_iep *iep)
for (cmp = IEP_MIN_CMP; cmp < IEP_MAX_CMP; cmp++) {
regmap_update_bits(iep->map, ICSS_IEP_CMP_STAT_REG,
IEP_CMP_STATUS(cmp), IEP_CMP_STATUS(cmp));
+
+ regmap_update_bits(iep->map, ICSS_IEP_CMP_CFG_REG,
+ IEP_CMP_CFG_CMP_EN(cmp), 0);
}
/* enable reset counter on CMP0 event */
@@ -780,6 +783,11 @@ int icss_iep_exit(struct icss_iep *iep)
}
icss_iep_disable(iep);
+ if (iep->pps_enabled)
+ icss_iep_pps_enable(iep, false);
+ else if (iep->perout_enabled)
+ icss_iep_perout_enable(iep, NULL, false);
+
return 0;
}
EXPORT_SYMBOL_GPL(icss_iep_exit);
