linux-kernel - Re: [PATCH v3] net: phy: meson-gxl: Add generic dummy stubs for MMD register access

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Date:   Tue, 31 Jan 2023 11:05:19 +0100
From:   Jerome Brunet <jbrunet@...libre.com>
To:     cphealy@...il.com, andrew@...n.ch, hkallweit1@...il.com,
        linux@...linux.org.uk, davem@...emloft.net,
        neil.armstrong@...aro.org, khilman@...libre.com,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        jeremy.wang@...ogic.com
Cc:     Chris Healy <healych@...zon.com>
Subject: Re: [PATCH v3] net: phy: meson-gxl: Add generic dummy stubs for MMD
 register access


On Mon 30 Jan 2023 at 15:14, Chris Healy <cphealy@...il.com> wrote:

> From: Chris Healy <healych@...zon.com>
>
> The Meson G12A Internal PHY does not support standard IEEE MMD extended
> register access, therefore add generic dummy stubs to fail the read and
> write MMD calls. This is necessary to prevent the core PHY code from
> erroneously believing that EEE is supported by this PHY even though this
> PHY does not support EEE, as MMD register access returns all FFFFs.

This is definitely something that should be done, Thx !

>
> Fixes: 5c3407abb338 ("net: phy: meson-gxl: add g12a support")

This commit does not seems appropriate, especially since only the GXL ops
are changed, not the g12a variant.

This brings a 2nd point, any reason for not changing the g12 variant ?
I'm fairly confident it does support EEE either.

> Reviewed-by: Heiner Kallweit <hkallweit1@...il.com>
> Signed-off-by: Chris Healy <healych@...zon.com>
>
> ---
>
> Changes in v3:
> * Add reviewed-by
> Change in v2:
> * Add fixes tag
>
>  drivers/net/phy/meson-gxl.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/net/phy/meson-gxl.c b/drivers/net/phy/meson-gxl.c
> index c49062ad72c6..5e41658b1e2f 100644
> --- a/drivers/net/phy/meson-gxl.c
> +++ b/drivers/net/phy/meson-gxl.c
> @@ -271,6 +271,8 @@ static struct phy_driver meson_gxl_phy[] = {
>  		.handle_interrupt = meson_gxl_handle_interrupt,
>  		.suspend        = genphy_suspend,
>  		.resume         = genphy_resume,
> +		.read_mmd	= genphy_read_mmd_unsupported,
> +		.write_mmd	= genphy_write_mmd_unsupported,
>  	},
>  };