net: mscc: ocelot: don't report that RX timestamping is enabled by default

PTP RX timestamping should be enabled when the user requests it, not by
default. If it is enabled by default, it can be problematic when the
ocelot driver is a DSA master, and it sidesteps what DSA tries to avoid
through __dsa_master_hwtstamp_validate().

Additionally, after the change which made ocelot trap PTP packets only
to the CPU at ocelot_hwtstamp_set() time, it is no longer even true that
RX timestamping is enabled by default, because until ocelot_hwtstamp_set()
is called, the PTP traps are actually not set up. So the rx_filter field
of ocelot->hwtstamp_config reflects an incorrect reality.

Fixes: 96ca08c05838 ("net: mscc: ocelot: set up traps for PTP packets")
Fixes: 4e3b0468e6d7 ("net: mscc: PTP Hardware Clock (PHC) support")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/mscc/ocelot_ptp.c b/drivers/net/ethernet/mscc/ocelot_ptp.c
index 2180ae94c74476387516581aafeb85f1db522605..673bfd70867a6304939b03bd8e5eaf8451a646bc 100644 (file)
--- a/drivers/net/ethernet/mscc/ocelot_ptp.c
+++ b/drivers/net/ethernet/mscc/ocelot_ptp.c
@@ -824,11 +824,6 @@ int ocelot_init_timestamp(struct ocelot *ocelot,
 
        ocelot_write(ocelot, PTP_CFG_MISC_PTP_EN, PTP_CFG_MISC);
 
-       /* There is no device reconfiguration, PTP Rx stamping is always
-        * enabled.
-        */
-       ocelot->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
-
        return 0;
 }
 EXPORT_SYMBOL(ocelot_init_timestamp);