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Message-ID: <799572b672ea8b4756236b14068aef7c8fa726a6.camel@redhat.com>
Subject: Re: [PATCH net v2 2/2] net: dsa: mt7530: fix disabling EEE on
 failure on MT7531 and MT7988
From: Paolo Abeni <pabeni@redhat.com>
To: arinc.unal@arinc9.com, Daniel Golle <daniel@makrotopia.org>, DENG
 Qingfang <dqfext@gmail.com>, Sean Wang <sean.wang@mediatek.com>, Andrew
 Lunn <andrew@lunn.ch>, Florian Fainelli <f.fainelli@gmail.com>, Vladimir
 Oltean <olteanv@gmail.com>, "David S. Miller" <davem@davemloft.net>, Eric
 Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Matthias
 Brugger <matthias.bgg@gmail.com>, AngeloGioacchino Del Regno
 <angelogioacchino.delregno@collabora.com>, =?ISO-8859-1?Q?Ren=E9?= van
 Dorst <opensource@vdorst.com>, Russell King <linux@armlinux.org.uk>,
 SkyLake Huang <SkyLake.Huang@mediatek.com>, Heiner Kallweit
 <hkallweit1@gmail.com>
Cc: Bartel Eerdekens <bartel.eerdekens@constell8.be>,
 mithat.guner@xeront.com,  erkin.bozoglu@xeront.com, netdev@vger.kernel.org,
 linux-kernel@vger.kernel.org,  linux-arm-kernel@lists.infradead.org,
 linux-mediatek@lists.infradead.org
Date: Tue, 26 Mar 2024 10:02:54 +0100
In-Reply-To: <20240321-for-net-mt7530-fix-eee-for-mt7531-mt7988-v2-2-9af9d5041bfe@arinc9.com>
References: 
	<20240321-for-net-mt7530-fix-eee-for-mt7531-mt7988-v2-0-9af9d5041bfe@arinc9.com>
	 <20240321-for-net-mt7530-fix-eee-for-mt7531-mt7988-v2-2-9af9d5041bfe@arinc9.com>
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On Thu, 2024-03-21 at 19:29 +0300, Ar=C4=B1n=C3=A7 =C3=9CNAL via B4 Relay w=
rote:
> From: Ar=C4=B1n=C3=A7 =C3=9CNAL <arinc.unal@arinc9.com>
>=20
> 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.
>=20
> 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 o=
n
> mt753x_phylink_mac_link_up(). But it did not set the MT7531_FORCE_EEE1G a=
nd
> 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(=
).
>=20
> Define these bits and add them to MT7531_FORCE_MODE which is being used b=
y
> the subdriver. With this, EEE will be prevented from being enabled on the
> switch MACs when phy_init_eee() fails.
>=20
> Fixes: 40b5d2f15c09 ("net: dsa: mt7530: Add support for EEE features")
> Signed-off-by: Ar=C4=B1n=C3=A7 =C3=9CNAL <arinc.unal@arinc9.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