netdev - Re: [PATCH RFC net-next] net: phy: marvell10g: add downshift tunable support

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Message-ID: <20210720171401.GV22278@shell.armlinux.org.uk>
Date:   Tue, 20 Jul 2021 18:14:01 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Marek Behún <kabel@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH RFC net-next] net: phy: marvell10g: add downshift tunable
 support

On Tue, Jul 20, 2021 at 05:04:24PM +0200, Marek Behún wrote:
> Hi Russell,
> 
> On Tue, 20 Jul 2021 14:38:20 +0100
> Russell King <rmk+kernel@...linux.org.uk> wrote:
> 
> > Add support for the downshift tunable for the Marvell 88x3310 PHY.
> > Downshift is only usable with firmware 0.3.5.0 and later.
> 
> mv3310_{g,s}et_features are also used for 88E211x, but there is no such
> register in the documentation for these PHYs. (Also firmware versions on
> those are different, the newest is 8.3.0.0, but thats not important.)
> My solution would be to rename the current methods prefix to mv211x_ and
> and add new mv3310_{g,s}et_tunable methods.

There's more than just the tunables themselves - there's also
config_init().

We already need to reject downshift when old firmware is running,
as that fails to work correctly. So, we can just do that for
88E211x as well, adding a flag to struct mv3310_chip to indicate
whether downshift is present. Sound sensible?

-- 
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