netdev - Re: [PATCH net] net: phy: marvell10g: fix 88x3310 power up

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Message-ID: <ZLeHyzsRqxAj4ZGO@shell.armlinux.org.uk>
Date: Wed, 19 Jul 2023 07:50:51 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Jiawen Wu <jiawenwu@...stnetic.com>
Cc: 'Simon Horman' <simon.horman@...igine.com>, kabel@...nel.org,
	andrew@...n.ch, hkallweit1@...il.com, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net] net: phy: marvell10g: fix 88x3310 power up

On Wed, Jul 19, 2023 at 10:29:38AM +0800, Jiawen Wu wrote:
> [59697.591809] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1, regnum=6, val=c000
> [59697.592811] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1, regnum=5, val=9a
> [59697.593814] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1, regnum=2, val=2b
> [59697.594817] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1, regnum=3, val=9ab
> [59697.595811] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=3, regnum=2, val=2b
> [59697.596811] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=3, regnum=3, val=9ab
> [59697.597811] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=4, regnum=2, val=141
> [59697.598809] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=4, regnum=3, val=dab
> [59697.599809] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=7, regnum=2, val=2b
> [59697.600810] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=7, regnum=3, val=9ab
> [59697.601815] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1e, regnum=8, val=0
> [59697.602930] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1f, regnum=8, val=fffe
> [59697.608811] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=3, regnum=d00d, val=680b
> [59697.609823] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1, regnum=c050, val=7e
> [59697.610814] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1, regnum=c011, val=2
> [59697.611817] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1, regnum=c012, val=200
> [59697.611820] mv88x3310 txgbe-400:00: Firmware version 0.2.2.0
> [59697.612817] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1f, regnum=f001, val=803

So here we can see the PHY is already in low-power mode, so presumably
it's configured to do that from power-up?

> [59697.612820] txgbe 0000:04:00.0: [W]phy_addr=0, devnum=1f, regnum=f08c, val=9600
> [59697.613819] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1f, regnum=f08a, val=cd9a
> [59697.613822] txgbe 0000:04:00.0: [W]phy_addr=0, devnum=1f, regnum=f08a, val=d9a
> [59697.614818] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=7, regnum=1, val=9ab
> [59697.615816] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1, regnum=8, val=9701
> [59697.616817] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1, regnum=b, val=1a4
> [59697.617814] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=3, regnum=14, val=e
> [59697.618809] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1, regnum=15, val=3
> [59697.619811] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=7, regnum=3c, val=0
> [59697.619831] mv88x3310 txgbe-400:00: attached PHY driver (mii_bus:phy_addr=txgbe-400:00, irq=POLL)

The following is where we attempt to power up the PHY:

> [59697.830169] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1f, regnum=f001, val=803
> [59697.830179] txgbe 0000:04:00.0: [W]phy_addr=0, devnum=1f, regnum=f001, val=3

The above is our attempt to clear the low power bit.

> [59697.830926] txgbe 0000:04:00.0: [R]phy_addr=0, devnum=1f, regnum=f001, val=803

According to this read though (which is in get_mactype), the write
didn't take effect.

If you place a delay of 1ms after phy_clear_bits_mmd() in
mv3310_power_up(), does it then work?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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