linux-kernel - Re: [PATCH net-next 3/3] net: fec: reset phy on resume after power-up

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Message-ID: <20211216075216.GA4190@francesco-nb.int.toradex.com>
Date:   Thu, 16 Dec 2021 08:52:16 +0100
From:   Francesco Dolcini <francesco.dolcini@...adex.com>
To:     Joakim Zhang <qiangqing.zhang@....com>
Cc:     Francesco Dolcini <francesco.dolcini@...adex.com>,
        Andrew Lunn <andrew@...n.ch>,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        Philippe Schenker <philippe.schenker@...adex.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 3/3] net: fec: reset phy on resume after power-up

On Thu, Dec 16, 2021 at 04:52:39AM +0000, Joakim Zhang wrote:
> As I can see, when system suspended, PHY is totally powered down,
> since you disable the regulator. At this situation, if you
> assert reset signal, you mean it will increase the power
> consumption? PHY is totally powered down, why assert reset
> signal still affect PHY? 
In general there are *other* use cases in which the PHY is powered in
suspend. We should not create a regression there.

Francesco