• Vladimir Oltean's avatar
    net: dsa: sja1105: Restore PTP time after switch reset · 6cf99c13
    Vladimir Oltean authored
    The PTP time of the switch is not preserved when uploading a new static
    configuration. Work around this hardware oddity by reading its PTP time
    before a static config upload, and restoring it afterwards.
    
    Static config changes are expected to occur at runtime even in scenarios
    directly related to PTP, i.e. the Time-Aware Scheduler of the switch is
    programmed in this way.
    
    Perhaps the larger implication of this patch is that the PTP .gettimex64
    and .settime functions need to be exposed to sja1105_main.c, where the
    PTP lock needs to be held during this entire process. So their core
    implementation needs to move to some common functions which get exposed
    in sja1105_ptp.h.
    Signed-off-by: default avatarVladimir Oltean <olteanv@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    6cf99c13
sja1105_ptp.c 18 KB