netdev - Re: [net-next 03/15] net/mlx5: Add adjphase function to support hardware-only offset control

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Date:   Mon, 23 Jan 2023 14:36:24 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Rahul Rameshbabu <rrameshbabu@...dia.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Saeed Mahameed <saeed@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Gal Pressman <gal@...dia.com>,
        Vincent Cheng <vincent.cheng.xh@...esas.com>
Subject: Re: [net-next 03/15] net/mlx5: Add adjphase function to support
 hardware-only offset control

On Mon, Jan 23, 2023 at 10:44:35AM -0800, Rahul Rameshbabu wrote:

> 1. Can the PHC servo change the frequency and not be expected to reset
>    it back to the frequency before the phase control word is issued? If
>    it's an expectation for the phase control word to reset the frequency
>    back, I think that needs to be updated in the comments as a
>    requirement.

I would expect the PHC to restore the previously dialed frequency once
the ADJ_OFFSET (adjphase) calls stop.

Thanks,
Richard