netdev - Re: [PATCH] net: phy: broadcom: stub c45 read/write for 54810

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Date: Fri, 11 Aug 2023 16:47:49 -0700
From: Justin Chen <justin.chen@...adcom.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>
Cc: netdev@...r.kernel.org, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Andrew Lunn <andrew@...n.ch>, 
	Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: phy: broadcom: stub c45 read/write for 54810

On Fri, Aug 11, 2023 at 4:40 PM Florian Fainelli
<florian.fainelli@...adcom.com> wrote:
>
>
>
> On 8/11/2023 4:29 PM, Justin Chen wrote:
> > The 54810 does not support c45. The mmd_phy_indirect accesses return
> > arbirtary values leading to odd behavior like saying it supports EEE
> > when it doesn't. We also see that reading/writing these non-existent
> > MMD registers leads to phy instability in some cases.
> >
> > Signed-off-by: Justin Chen <justin.chen@...adcom.com>
>
> Thanks for submitting this fix, I would be tempted to slap a:
>
> Fixes: b14995ac2527 ("net: phy: broadcom: Add BCM54810 PHY entry")
>
> so we get it back ported to stable trees where appropriate. It is not
> clear whether we should return -EINVAL vs. -EOPNOTSUPP which may more
> clearly indicate the inability to support MMD registers?

Hmm agreed EOPNOTSUPP seems better here. Will submit v2 with fixes tag
if there are no objections to this patch.

Thanks,
Justin

> --
> Florian

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