netdev - Re: [PATCH net] net: dsa: sja1105: Remove restriction of zero base-time for taprio offload

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Date:   Mon, 30 Dec 2019 20:13:39 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     olteanv@...il.com
Cc:     jakub.kicinski@...ronome.com, richardcochran@...il.com,
        f.fainelli@...il.com, vivien.didelot@...il.com, andrew@...n.ch,
        vinicius.gomes@...el.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: sja1105: Remove restriction of zero
 base-time for taprio offload

From: Vladimir Oltean <olteanv@...il.com>
Date: Fri, 27 Dec 2019 03:03:54 +0200

> The check originates from the initial implementation which was not based
> on PTP time but on a standalone clock source. In the meantime we can now
> program the PTPSCHTM register at runtime with the dynamic base time
> (actually with a value that is 200 ns smaller, to avoid writing DELTA=0
> in the Schedule Entry Points Parameters Table). And we also have logic
> for moving the actual base time in the future of the PHC's current time
> base, so the check for zero serves no purpose, since even if the user
> will specify zero, that's not what will end up in the static config
> table where the limitation is.
> 
> Fixes: 86db36a347b4 ("net: dsa: sja1105: Implement state machine for TAS with PTP clock source")
> Signed-off-by: Vladimir Oltean <olteanv@...il.com>

Applied.