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

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Message-ID: <6e12f5a5-8007-4ddc-a5ad-be556656af71@nvidia.com>
Date: Thu, 18 Jul 2024 15:08:29 +0100
From: Jon Hunter <jonathanh@...dia.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
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 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.

Jon

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

-- 
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