netdev - Re: [PATCH net-next] ptp: ocp: Add ptp_ocp_adjtime

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Message-ID: <20220301182153.6a1a8e89@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Tue, 1 Mar 2022 18:21:53 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jonathan Lemon <jonathan.lemon@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        richardcochran@...il.com, kernel-team@...com
Subject: Re: [PATCH net-next] ptp: ocp: Add ptp_ocp_adjtime_coarse for large
 adjustments

On Mon, 28 Feb 2022 12:39:57 -0800 Jonathan Lemon wrote:
> In ("ptp: ocp: Have FPGA fold in ns adjustment for adjtime."), the
> ns adjustment was written to the FPGA register, so the clock could
> accurately perform adjustments.
> 
> However, the adjtime() call passes in a s64, while the clock adjustment
> registers use a s32.  When trying to perform adjustments with a large
> value (37 sec), things fail.
> 
> Examine the incoming delta, and if larger than 1 sec, use the original
> (coarse) adjustment method.  If smaller than 1 sec, then allow the
> FPGA to fold in the changes over a 1 second window.
> 
> Fixes: 6d59d4fa1789 ("ptp: ocp: Have FPGA fold in ns adjustment for adjtime.")
> Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>

This one's tagged for net-next - do you intend for it to go to net-next,
or is that a typo?