Re: [E1000-devel] igb driver with Intel Atom Bay Trail issue

["Семен Верченко" <semverchenko@factor-ts.ru>]

On 29.03.2019 15:30, Hans de Goede wrote:
> Hi,
>
> On 3/28/19 4:49 PM, Andy Shevchenko wrote:
>> On Thu, Mar 28, 2019 at 04:32:27PM +0100, Hans de Goede wrote:
>>> On 28-03-19 16:24, Andy Shevchenko wrote:
>>>> On Thu, Mar 28, 2019 at 04:01:37PM +0100, Hans de Goede wrote:
>>>>> On 28-03-19 15:58, Andy Shevchenko wrote:
>>>>>> On Thu, Mar 28, 2019 at 03:35:58PM +0100, David Müller wrote:
>>>>>>> Andy Shevchenko wrote:
>>>>>>>> On Wed, Mar 27, 2019 at 06:31:19PM +0100, David Müller wrote:
>>
>>>>>>>> Any driver for device which is using PMC clock should take it into
>>>>>>>> consideration.
>>>>>>>
>>>>>>> I agree that each driver should properly request the clocks and 
>>>>>>> other
>>>>>>> resources needed.
>>
>>>>>> Can you elaborate a bit more the case you are talking about?
>>
>>>>> I think the board with igb ethernet controllers might
>>>>> just as well be handled the same way (I already checked it has usable
>>>>> DMI identifying info).
>>>>
>>>> But am I right that in the case of igb we will loose power at 
>>>> suspend? Wouldn't
>>>> be better to patch the driver?
>>>
>>> This is an industrial embedded PC, so it is not running on battery and
>>> I doubt it typically spends a lot of time in suspend at all.
>>
>> Okay, but still from logical point of view wouldn't be better to fix 
>> the driver
>> for such case? At least I see benefits out of this approach: a) less 
>> hackish,
>> less quirk code; b) if this happens on non-industrial case it would 
>> be better
>> to have in the driver due to power consumption.
>
> Maybe, I guess we first need to figure out which platforms clock(s) is 
> (are)
> being used, if there is more then one; or it is a different one then 
> in the
> realtek ethernet case it might be better to go with the dmi quirk option.
>
> Semyon Verchenko can you (as root) run the following command on a kernel
> where the ethernet does work:
>
> grep . /sys/kernel/debug/clk/pmc_plt_clk_?/flags
>
> And then email us the output please?
>
> Regards,
>
> Hans
>
I don't have flags files in /sys/kernel/debug/clk/pmc_plt_clk_?; did you 
mean clk_flags?

[root@archatom ~]# grep . /sys/kernel/debug/clk/pmc_plt_clk_?/flags
grep: /sys/kernel/debug/clk/pmc_plt_clk_?/flags: No such file or directory
[root@archatom ~]# grep . /sys/kernel/debug/clk/pmc_plt_clk_?/clk_flags
/sys/kernel/debug/clk/pmc_plt_clk_0/clk_flags:CLK_IS_CRITICAL
/sys/kernel/debug/clk/pmc_plt_clk_1/clk_flags:CLK_IS_CRITICAL
/sys/kernel/debug/clk/pmc_plt_clk_2/clk_flags:CLK_IS_CRITICAL
/sys/kernel/debug/clk/pmc_plt_clk_3/clk_flags:CLK_IS_CRITICAL
[root@archatom ~]# ls /sys/kernel/debug/clk
clk_dump         clk_orphan_summary  pll            pmc_plt_clk_1 
pmc_plt_clk_3  pmc_plt_clk_5
clk_orphan_dump  clk_summary         pmc_plt_clk_0  pmc_plt_clk_2 
pmc_plt_clk_4  xtal

Kernel is 5.0.4 with commit 648e921888ad ("clk: x86: Stop marking clocks 
as CLK_IS_CRITICAL") reversed, is it enough or I need to install older 
kernel?