netdev - Re: [PATCH] platform/x86: pmc_atom: Add DMI quirk for Lex 3I380A/CW boards

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Message-ID: <71041a3b-cdb4-dd3a-d94e-c8f77179a31f@redhat.com>
Date:   Thu, 28 Jul 2022 20:42:11 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Matwey V. Kornilov" <matwey.kornilov@...il.com>
Cc:     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,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        sboyd@...nel.org, markgross@...nel.org,
        platform-driver-x86@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        paul.gortmaker@...driver.com, stable@...r.kernel.org
Subject: Re: [PATCH] platform/x86: pmc_atom: Add DMI quirk for Lex 3I380A/CW
 boards

Hi,

On 7/28/22 20:39, Matwey V. Kornilov wrote:
> чт, 28 июл. 2022 г. в 21:33, Hans de Goede <hdegoede@...hat.com>:
>>
>> Hi,
>>
>> On 7/27/22 17:32, Matwey V. Kornilov wrote:
>>> Lex 3I380A/CW (Atom E3845) motherboards are equipped with dual Intel I211
>>> based 1Gbps copper ethernet:
>>>
>>>      http://www.lex.com.tw/products/pdf/3I380A&3I380CW.pdf
>>>
>>> This patch is to fix the issue with broken "LAN2" port. Before the
>>> patch, only one ethernet port is initialized:
>>>
>>>      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
>>>
>>> With this patch, both ethernet ports are available:
>>>
>>>      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)
>>>
>>> The issue was observed at 3I380A board with BIOS version "A4 01/15/2016"
>>> and 3I380CW board with BIOS version "A3 09/29/2014".
>>>
>>> Reference: https://lore.kernel.org/netdev/08c744e6-385b-8fcf-ecdf-1292b5869f94@redhat.com/
>>> Fixes: 648e921888ad ("clk: x86: Stop marking clocks as CLK_IS_CRITICAL")
>>> Cc: <stable@...r.kernel.org> # v4.19+
>>> Signed-off-by: Matwey V. Kornilov <matwey@....msu.ru>
>>
>>
>> Thank you for the patch.
>>
>> The last week I have received 2 different patches adding
>> a total of 3 new "Lex BayTrail" entries to critclk_systems[]
>> on top of the existing 2.
>>
>> Looking at: https://www.lex.com.tw/products/embedded-ipc-board/
>> we can see that Lex BayTrail makes many embedded boards with
>> multiple ethernet boards and none of their products are battery
>> powered so we don't need to worry (too much) about power consumption
>> when suspended.
>>
>> So instead of adding 3 new entries I've written a patch to
>> simply disable the turning off of the clocks on all
>> systems which have "Lex BayTrail" as their DMI sys_vendor:
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/commit/?h=review-hans&id=c9d959fc32a5f9312282817052d8986614f2dc08
>>
>> I've added a Reported-by tag to give you credit for the work
>> you have done on this.
>>
>> I will send this alternative fix to Linus as part of
>> the other pdx86 patches for 5.21.
> 
> Thank you. Will your fix also appear in stable/lts kernels?

Yes it has the same Fixes tag as your patch did, this will
cause it to automatically get cherry-picked into kernels
which have the fixed commit hash.

Regards,

Hans


>>> ---
>>>  drivers/platform/x86/pmc_atom.c | 18 ++++++++++++++++++
>>>  1 file changed, 18 insertions(+)
>>>
>>> diff --git a/drivers/platform/x86/pmc_atom.c b/drivers/platform/x86/pmc_atom.c
>>> index b8b1ed1406de..5dc82667907b 100644
>>> --- a/drivers/platform/x86/pmc_atom.c
>>> +++ b/drivers/platform/x86/pmc_atom.c
>>> @@ -388,6 +388,24 @@ static const struct dmi_system_id critclk_systems[] = {
>>>                       DMI_MATCH(DMI_PRODUCT_NAME, "CEC10 Family"),
>>>               },
>>>       },
>>> +     {
>>> +             /* pmc_plt_clk* - are used for ethernet controllers */
>>> +             .ident = "Lex 3I380A",
>>> +             .callback = dmi_callback,
>>> +             .matches = {
>>> +                     DMI_MATCH(DMI_SYS_VENDOR, "Lex BayTrail"),
>>> +                     DMI_MATCH(DMI_PRODUCT_NAME, "3I380A"),
>>> +             },
>>> +     },
>>> +     {
>>> +             /* pmc_plt_clk* - are used for ethernet controllers */
>>> +             .ident = "Lex 3I380CW",
>>> +             .callback = dmi_callback,
>>> +             .matches = {
>>> +                     DMI_MATCH(DMI_SYS_VENDOR, "Lex BayTrail"),
>>> +                     DMI_MATCH(DMI_PRODUCT_NAME, "3I380CW"),
>>> +             },
>>> +     },
>>>       {
>>>               /* pmc_plt_clk0 - 3 are used for the 4 ethernet controllers */
>>>               .ident = "Lex 3I380D",
>>
> 
>