netdev - Re: [PATCH net v2 2/2] net: dsa: mt7530: fix disabling EEE on failure on MT7531 and MT7988

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Message-ID: <799572b672ea8b4756236b14068aef7c8fa726a6.camel@redhat.com>
Date: Tue, 26 Mar 2024 10:02:54 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: arinc.unal@...nc9.com, Daniel Golle <daniel@...rotopia.org>, DENG
 Qingfang <dqfext@...il.com>, Sean Wang <sean.wang@...iatek.com>, Andrew
 Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>, Vladimir
 Oltean <olteanv@...il.com>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Matthias
 Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
 <angelogioacchino.delregno@...labora.com>, René van
 Dorst <opensource@...rst.com>, Russell King <linux@...linux.org.uk>,
 SkyLake Huang <SkyLake.Huang@...iatek.com>, Heiner Kallweit
 <hkallweit1@...il.com>
Cc: Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
 mithat.guner@...ont.com,  erkin.bozoglu@...ont.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org,  linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net v2 2/2] net: dsa: mt7530: fix disabling EEE on
 failure on MT7531 and MT7988

On Thu, 2024-03-21 at 19:29 +0300, Arınç ÜNAL via B4 Relay wrote:
> From: Arınç ÜNAL <arinc.unal@...nc9.com>
> 
> The MT7531_FORCE_EEE1G and MT7531_FORCE_EEE100 bits let the
> PMCR_FORCE_EEE1G and PMCR_FORCE_EEE100 bits determine the 1G/100 EEE
> abilities of the MAC. If MT7531_FORCE_EEE1G and MT7531_FORCE_EEE100 are
> unset, the abilities are left to be determined by PHY auto polling.
> 
> The commit 40b5d2f15c09 ("net: dsa: mt7530: Add support for EEE features")
> made it so that the PMCR_FORCE_EEE1G and PMCR_FORCE_EEE100 bits are set on
> mt753x_phylink_mac_link_up(). But it did not set the MT7531_FORCE_EEE1G and
> MT7531_FORCE_EEE100 bits. Because of this, EEE will be enabled on the
> switch MACs by polling the PHY, regardless of the result of phy_init_eee().
> 
> Define these bits and add them to MT7531_FORCE_MODE which is being used by
> the subdriver. With this, EEE will be prevented from being enabled on the
> switch MACs when phy_init_eee() fails.
> 
> Fixes: 40b5d2f15c09 ("net: dsa: mt7530: Add support for EEE features")
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>

If I read the past discussion correctly, this is a potential issue
found by code inspection and never producing problem in practice, am I
correct?

If so I think it will deserve a 3rd party tested-by tag or similar to
go in.

If nobody could provide such feedback in a little time, I suggest to
drop this patch and apply only 1/2.

Cheers,

Paolo