linux-kernel - Re: [PATCH v8 00/19] Consolidate and improve NVIDIA Tegra CPUIDLE driver(s)

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Message-ID: <9e0e5e1f-e41c-7c37-9618-44ceff6d0a56@gmail.com>
Date:   Wed, 18 Dec 2019 10:10:03 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Peter De Schrijver <pdeschrijver@...dia.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 00/19] Consolidate and improve NVIDIA Tegra CPUIDLE
 driver(s)

10.12.2019 19:21, Dmitry Osipenko пишет:
> 10.12.2019 19:02, Dmitry Osipenko пишет:
>> 10.12.2019 05:35, Michał Mirosław пишет:
>>> On Tue, Dec 10, 2019 at 12:22:18AM +0300, Dmitry Osipenko wrote:
>>>> 09.12.2019 19:04, Michał Mirosław пишет:
>>>>> On Sun, Dec 08, 2019 at 01:56:14AM +0300, Dmitry Osipenko wrote:
>>>>>> 08.12.2019 00:52, Michał Mirosław пишет:
>>>>>>> On Tue, Dec 03, 2019 at 03:40:57AM +0300, Dmitry Osipenko wrote:
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> This series does the following:
>>>>>>>>
>>>>>>>>   1. Unifies Tegra20/30/114 drivers into a single driver and moves it out
>>>>>>>>      into common drivers/cpuidle/ directory.
>>>>>>>>
>>>>>>>>   2. Enables CPU cluster power-down idling state on Tegra30.
>>>>>>>>
>>>>>>>> In the end there is a quite nice clean up of the Tegra CPUIDLE drivers
>>>>>>>> and of the Tegra's arch code in general. Please review, thanks!
>>>>>>>
>>>>>>> I did a quick smoke test for this series on top of Linus' master:
>>>>>>>  - rebuilding with the patches applied, CONFIG_ARM_TEGRA_CPUIDLE=n - works
>>>>>>>  - building with CONFIG_ARM_TEGRA_CPUIDLE=y - doesn't boot
>>>>>>>
>>>>>>> The hang is somewhere early in the boot process, before simplefb can
>>>>>>> take the console and show any logs. If I get BOOTFB to work again I might
>>>>>>> be able to get some more info.
>>>>>>
>>>>>> Thank you very much for trying these patches!
>>>>>>
>>>>>> Could you please try to make ARM_TEGRA_CPUIDLE "tristate" in the Kconfig
>>>>>> and compile it as a loadable module? That way you'll get framebuffer
>>>>>> shown before the hang happens.
>>>>>>
>>>>>> Does LP2 suspend/resume work for you? There should be
>>>>>> "nvidia,suspend-mode = <2>" in the PMC's node of device-tree.
>>>>>
>>>>> Not at the moment. I also tried suspend-mode = <1> and <0>, but it
>>>>> made no difference.
>>>>
>>>> If LP2 doesn't work, then it explains why you're getting the hang.
>>>>
>>>> Are you using TF300T for the testing? I'm recalling that LP2 worked for
>>>> you sometime ago on TF300T, maybe some offending change was introduced
>>>> since then. Could you please try to do the git bisection or at least
>>>> find out what is the last good kernel version?
>>>>
>>>> I rebased this series on a recent linux-next and you could find the
>>>> rebased patches here [1].
>>>>
>>>> [1] https://github.com/grate-driver/linux/commits/master
>>>>
>>>> With [1] you should be able to remove "nvidia,suspend-mode" property
>>>> from the device-tree to get cpuidle working with the disabled CC6 state
>>>> (LP2). Could you please check that at least disabled CC6 works for you?
>>>
>>> I tested suspend with your tree merged, but CONFIG_TEGRA_CPUIDLE=n. LP2
>>> seems to work [1]. The same tree with CONFIG_TEGRA_CPUIDLE=y doesn't
>>> boot. I'll try comparing DTs, but other than that I'm blocked on BOOTFB now.
>>
>> That's an interesting result.
>>
>>> [1] rtcwake -s 3 -d /dev/rtc0 -v -m mem
>>>
>>> (...)
>>> [ 2710.157919] PM: suspend entry (deep)
>>> [ 2710.161205] Filesystems sync: 0.000 seconds
>>> [ 2710.176677] Freezing user space processes ... (elapsed 0.001 seconds) done.
>>> [ 2710.178342] OOM killer disabled.
>>> [ 2710.178527] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
>>> [ 2710.347871] Disabling non-boot CPUs ...
>>> [ 2710.349160] IRQ 18: no longer affine to CPU1
>>> [ 2710.352499] IRQ 19: no longer affine to CPU2
>>> [ 2710.370059] IRQ 20: no longer affine to CPU3
>>> [ 2710.371284] Entering suspend state LP2
>>> [ 2710.371556] Enabling non-boot CPUs ...
>>> [ 2710.373157] CPU1 is up
>>> [ 2710.374598] CPU2 is up
>>> [ 2710.375996] CPU3 is up
>>> [ 2710.462876] OOM killer enabled.
>>> [ 2710.463018] Restarting tasks ...
>>> [ 2710.463880] tegra-devfreq 6000c800.actmon: Failed to get emc clock
>>> [ 2710.464509] done.
>>> [ 2710.552824] asus-ec 1-0015: model         : ASUS-TF201-PAD
>>> [ 2710.558345] asus-ec 1-0015: FW version    : PAD-EC20T-0216
>>> [ 2710.562942] asus-ec 1-0015: Config format : ECFG-0001
>>> [ 2710.567651] asus-ec 1-0015: HW version    : TF201-PAD-SKU1
>>> [ 2710.572488] asus-ec 1-0015: EC FW behaviour: susb on when system wakeup
>>> [ 2710.769796] atkbd serio1: no of_node; not parsing pinctrl DT
>>> [ 2710.835629] asus-ec 5-0019: model         : ASUS-TF201-DOCK
>>> [ 2710.838686] asus-ec 5-0019: FW version    : DOCK-EC20N-0207
>>> [ 2710.841865] asus-ec 5-0019: Config format : ECFG-0001
>>> [ 2710.844271] asus-ec 5-0019: HW version    : PCBA-SKU-2
>>> [ 2710.847950] asus-ec 5-0019: EC FW behaviour: susb on when receive ec_req
>>> [ 2711.040935] PM: suspend exit
>>>
>>
>> Could you please try this change on top of recent grate-linux (it should
>> allow display to light up before the hang):
>>
>> diff --git a/drivers/cpuidle/cpuidle-tegra.c
>> b/drivers/cpuidle/cpuidle-tegra.c
>> index db9ccba5a74c..21317b4e16c1 100644
>> --- a/drivers/cpuidle/cpuidle-tegra.c
>> +++ b/drivers/cpuidle/cpuidle-tegra.c
>> @@ -22,6 +22,7 @@
>>  #include <linux/ktime.h>
>>  #include <linux/platform_device.h>
>>  #include <linux/types.h>
>> +#include <linux/workqueue.h>
>>
>>  #include <linux/clk/tegra.h>
>>  #include <linux/firmware/trusted_foundations.h>
>> @@ -332,7 +333,7 @@ static void tegra_cpuidle_setup_tegra114_c7_state(void)
>>  	s->exit_latency = 500;
>>  }
>>
>> -static int tegra_cpuidle_probe(struct platform_device *pdev)
>> +static void tegra_cpuidle_probe_work(struct work_struct *work)
>>  {
>>  	/* LP2 could be disabled in device-tree */
>>  	if (tegra_pmc_get_suspend_mode() < TEGRA_SUSPEND_LP2)
>> @@ -372,10 +373,18 @@ static int tegra_cpuidle_probe(struct
>> platform_device *pdev)
>>  		break;
>>
>>  	default:
>> -		return -EINVAL;
>> +		return;
>>  	}
>>
>> -	return cpuidle_register(&tegra_idle_driver, cpu_possible_mask);
>> +	cpuidle_register(&tegra_idle_driver, cpu_possible_mask);
>> +}
>> +
>> +static DECLARE_DELAYED_WORK(delayed_probe, tegra_cpuidle_probe_work);
>> +
>> +static int tegra_cpuidle_probe(struct platform_device *pdev)
>> +{
>> +	schedule_delayed_work(&delayed_probe, 5 * HZ);
>> +	return 0;
>>  }
>>
>>  static struct platform_driver tegra_cpuidle_driver = {
>>
> 
> Also, do you have CONFIG_ARM_TEGRA20_CPUFREQ=y? Please try to disable it
> if it's enabled and if you enabled CPU OPPs in the device-tree.
> 

I'm going to drop the "Support CPU cluster power-down state on Tegra30"
for now to not block the rest of the patches.

Will get back to that patch once we'll fix the TF300T problem, perhaps
something needs to be changed for the Trusted Foundations firmware handling.