linux-kernel - Re: [PATCH net-next 7/9] net: phy: icplus: select page before writing control register

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Message-ID: <20210210103059.GR1463@shell.armlinux.org.uk>
Date:   Wed, 10 Feb 2021 10:30:59 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Michael Walle <michael@...le.cc>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next 7/9] net: phy: icplus: select page before
 writing control register

On Wed, Feb 10, 2021 at 08:03:07AM +0100, Heiner Kallweit wrote:
> On 09.02.2021 17:40, Michael Walle wrote:
> > +out:
> > +	return phy_restore_page(phydev, oldpage, err);
> 
> If a random page was set before entering config_init, do we actually want
> to restore it? Or wouldn't it be better to set the default page as part
> of initialization?

I think you've missed asking one key question: does the paging on this
PHY affect the standardised registers at 0..15 inclusive, or does it
only affect registers 16..31?

If it doesn't affect the standardised registers, then the genphy_*
functions don't care which page is selected.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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