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Date: Mon, 18 Mar 2024 06:11:51 -0700
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Subject: Re: [PATCH 1/3] net: dsa: mt7530: fix enabling EEE on MT7531 switch
 on all boards
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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>, Vladimir Oltean <olteanv@gmail.com>,
 "David S. Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>,
 Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
 Matthias Brugger <matthias.bgg@gmail.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>,
 =?UTF-8?Q?Ren=C3=A9_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
References: <20240318-for-net-mt7530-fix-eee-for-mt7531-mt7988-v1-0-3f17226344e8@arinc9.com>
 <65f7f17d.050a0220.7383e.5eeeSMTPIN_ADDED_BROKEN@mx.google.com>
From: Florian Fainelli <f.fainelli@gmail.com>
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On 3/18/2024 12:46 AM, Arınç ÜNAL via B4 Relay wrote:
> From: Arınç ÜNAL <arinc.unal@arinc9.com>
> 
> The commit 40b5d2f15c09 ("net: dsa: mt7530: Add support for EEE features")
> brought EEE support but did not enable EEE on MT7531 switch MACs. EEE is
> enabled on MT7531 switch MACs either by pulling the LAN2LED0 pin low on the
> board (bootstrapping), or unsetting the EEE_DIS bit on the trap register.
> 
> There are existing boards that were not designed to pull the pin low.
> Therefore, unset the EEE_DIS bit on the trap register.
> 
> Unlike MT7530, the modifiable trap register won't be populated identical to
> the trap status register after reset. Therefore, read from the trap status
> register, modify the bits, then write to the modifiable trap register.
> 
> The disable EEE bit on the trap pertains to the LAN2LED0 pin which is
> usually used to control an LED. Once the bit is unset, the pin will be low.
> That will make the active low LED turn on.
> 
> The pin is controlled by the switch PHY. It seems that the PHY controls the
> pin in the way that it inverts the pin state. That means depending on the
> wiring of the LED connected to LAN2LED0 on the board, the LED may be on
> without an active link.
> 
> Fixes: 40b5d2f15c09 ("net: dsa: mt7530: Add support for EEE features")
> Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>

Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
-- 
Florian