linux-kernel - Re: [RESEND PATCH net-next v3 3/4] net: phy: aquantia: wait for the GLOBAL

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Message-ID: <CAMRc=MdvsKeYEEvf2w3RxPiR=yLFXDwesiQ75JHTU-YEpkF-ZA@mail.gmail.com>
Date: Thu, 18 Jul 2024 16:13:58 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Jon Hunter <jonathanh@...dia.com>
Cc: 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>, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>, Brad Griffis <bgriffis@...dia.com>
Subject: Re: [RESEND PATCH net-next v3 3/4] net: phy: aquantia: wait for the
 GLOBAL_CFG to start returning real values

On Thu, Jul 18, 2024 at 4:08 PM Jon Hunter <jonathanh@...dia.com> wrote:
>
>
> On 18/07/2024 14:29, Bartosz Golaszewski wrote:
> > On Thu, Jul 18, 2024 at 3:04 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> >>
> >> On Thu, Jul 18, 2024 at 2:23 PM Jon Hunter <jonathanh@...dia.com> wrote:
> >>>
> >>>
> >>> With the current -next and mainline we are seeing the following issue on
> >>> our Tegra234 Jetson AGX Orin platform ...
> >>>
> >>>    Aquantia AQR113C stmmac-0:00: aqr107_fill_interface_modes failed: -110
> >>>    tegra-mgbe 6800000.ethernet eth0: __stmmac_open: Cannot attach to PHY (error: -110)
> >>>
> >>>
> >>> We have tracked it down to this change and looks like our PHY does not
> >>> support 10M ...
> >>>
> >>> $ ethtool eth0
> >>> Settings for eth0:
> >>>           Supported ports: [  ]
> >>>           Supported link modes:   100baseT/Full
> >>>                                   1000baseT/Full
> >>>                                   10000baseT/Full
> >>>                                   1000baseKX/Full
> >>>                                   10000baseKX4/Full
> >>>                                   10000baseKR/Full
> >>>                                   2500baseT/Full
> >>>                                   5000baseT/Full
> >>>
> >>> The following fixes this for this platform ...
> >>>
> >>> diff --git a/drivers/net/phy/aquantia/aquantia_main.c b/drivers/net/phy/aquantia/aquantia_main.c
> >>> index d12e35374231..0b2db486d8bd 100644
> >>> --- a/drivers/net/phy/aquantia/aquantia_main.c
> >>> +++ b/drivers/net/phy/aquantia/aquantia_main.c
> >>> @@ -656,7 +656,7 @@ static int aqr107_fill_interface_modes(struct phy_device *phydev)
> >>>           int i, val, ret;
> >>>
> >>>           ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
> >>> -                                       VEND1_GLOBAL_CFG_10M, val, val != 0,
> >>> +                                       VEND1_GLOBAL_CFG_100M, val, val != 0,
> >>>                                           1000, 100000, false);
> >>>           if (ret)
> >>>                   return ret;
> >>>
> >>>
> >>> However, I am not sure if this is guaranteed to work for all?
> >>
> >> Ah cr*p. No, I don't think it is. We should take the first supported
> >> mode for a given PHY I think.
> >>
> >
> > TBH I only observed the issue on AQR115C. I don't have any other model
> > to test with. Is it fine to fix it by implementing
> > aqr115_fill_interface_modes() that would first wait for this register
> > to return non-0 and then call aqr107_fill_interface_modes()?
>
> I am doing a bit more testing. We have seen a few issues with this PHY
> driver and so I am wondering if we also need something similar for the
> AQR113C variant too.
>
> Interestingly, the product brief for these PHYs [0] do show that both
> the AQR113C and AQR115C both support 10M. So I wonder if it is our
> ethernet controller that is not supporting 10M? I will check on this too.
>

Oh you have an 113c? I didn't get this. Yeah, weird, all docs say it
should support 10M. In fact all AQR PHYs should hence my initial
change.

Bart

> Jon
>
> [0]
> https://www.marvell.com/content/dam/marvell/en/public-collateral/transceivers/marvell-phys-transceivers-aqrate-gen4-product-brief.pdf
>
>
> --
> nvpublic