netdev - Re: [BISECTED] igb initialization failure on Bay Trail

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Date:   Tue, 26 Jul 2022 12:15:28 +0300
From:   "Matwey V. Kornilov" <matwey.kornilov@...il.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        carlo@...lessm.com, davem@...emloft.net, hkallweit1@...il.com,
        js@...21.net, linux-clk@...r.kernel.org,
        linux-wireless@...r.kernel.org, mturquette@...libre.com,
        netdev@...r.kernel.org, sboyd@...nel.org
Subject: Re: [BISECTED] igb initialization failure on Bay Trail

пн, 25 июл. 2022 г. в 20:08, Pierre-Louis Bossart
<pierre-louis.bossart@...ux.intel.com>:
>
>
>
> On 7/24/22 16:00, Matwey V. Kornilov wrote:
> > Hello,
> >
> > I've just found that the following commit
> >
> >     648e921888ad ("clk: x86: Stop marking clocks as CLK_IS_CRITICAL")
> >
> > breaks the ethernet on my Lex 3I380CW (Atom E3845) motherboard. The board is
> > equipped with dual Intel I211 based 1Gbps copper ethernet.
>
> It's not going to be simple, it's 4 yr old commit that fixes other
> issues with S0i3...

Additionally, it seems that the issue appears only when CONFIG_IGB=m
is used. When CONFIG_IGB=y then both ethernets are initialized
correctly.
However, most (if not all) kernel configs in Linux distros use CONFIG_IGB=m

>
> >
> > Before the commit I see the following:
> >
> >      igb 0000:01:00.0: added PHC on eth0
> >      igb 0000:01:00.0: Intel(R) Gigabit Ethernet Network Connection
> >      igb 0000:01:00.0: eth0: (PCIe:2.5Gb/s:Width x1) 4c:02:89:10:02:e4
> >      igb 0000:01:00.0: eth0: PBA No: FFFFFF-0FF
> >      igb 0000:01:00.0: Using MSI-X interrupts. 2 rx queue(s), 2 tx queue(s)
> >      igb 0000:02:00.0: added PHC on eth1
> >      igb 0000:02:00.0: Intel(R) Gigabit Ethernet Network Connection
> >      igb 0000:02:00.0: eth1: (PCIe:2.5Gb/s:Width x1) 4c:02:89:10:02:e5
> >      igb 0000:02:00.0: eth1: PBA No: FFFFFF-0FF
> >      igb 0000:02:00.0: Using MSI-X interrupts. 2 rx queue(s), 2 tx queue(s)
> >
> > while when the commit is applied I see the following:
> >
> >      igb 0000:01:00.0: added PHC on eth0
> >      igb 0000:01:00.0: Intel(R) Gigabit Ethernet Network Connection
> >      igb 0000:01:00.0: eth0: (PCIe:2.5Gb/s:Width x1) 4c:02:89:10:02:e4
> >      igb 0000:01:00.0: eth0: PBA No: FFFFFF-0FF
> >      igb 0000:01:00.0: Using MSI-X interrupts. 2 rx queue(s), 2 tx queue(s)
> >      igb: probe of 0000:02:00.0 failed with error -2
> >
> > Please note, that the second ethernet initialization is failed.
> >
> >
> > See also: http://www.lex.com.tw/products/pdf/3I380A&3I380CW.pdf



-- 
With best regards,
Matwey V. Kornilov