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Subject: Re: [PATCH] ACPI / LPSS: Don't skip late system PM ops for hibernate
 on BYT/CHT
To:     "Robert R. Howell" <RHowell@uwyo.edu>,
        "Rafael J. Wysocki" <rafael@kernel.org>
Cc:     Kai-Heng Feng <kai.heng.feng@canonical.com>,
        "rjw@rjwysocki.net" <rjw@rjwysocki.net>,
        "lenb@kernel.org" <lenb@kernel.org>,
        "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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From:   Hans de Goede <hdegoede@redhat.com>
Message-ID: <1bb008bd-ae0d-d351-ef0c-303e23b0eca5@redhat.com>
Date:   Thu, 9 May 2019 10:50:06 +0200
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Hi,

On 09-05-19 06:24, Robert R. Howell wrote:
> On 4/30/19 8:39 AM, Hans de Goede wrote:
>>
>> Hi,
>>
>> On 4/25/19 6:38 PM, Robert R. Howell wrote:
>>> On 4/24/19 1:20 AM, Rafael J. Wysocki wrote:
>>>
>>>> On Tue, Apr 23, 2019 at 10:03 PM Robert R. Howell <RHowell@uwyo.edu> wrote:
>>>>>
>>>>> On 4/23/19 2:07 AM, Rafael J. Wysocki wrote:
>>>>>>
>>>>>> On Sat, Apr 20, 2019 at 12:44 AM Robert R. Howell <RHowell@uwyo.edu> wrote:
>>>>>>>
>>>>>>> On 4/18/19 5:42 AM, Hans de Goede wrote:
>>>>>>>
>>>>>>>>> On 4/8/19 2:16 AM, Hans de Goede wrote:>
>>>>>>>>>>
>>>>>>>>>> Hmm, interesting so you have hibernation working on a T100TA
>>>>>>>>>> (with 5.0 + 02e45646d53b reverted), right ?
>>>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> I've managed to find a way around the i2c_designware timeout issues
>>>>>>> on the T100TA's.  The key is to NOT set DPM_FLAG_SMART_SUSPEND,
>>>>>>> which was added in the 02e45646d53b commit.
>>>>>>>
>>>>>>> To test that I've started with a 5.1-rc5 kernel, applied your recent patch
>>>>>>> to acpi_lpss.c, then apply the following patch of mine, removing
>>>>>>> DPM_FLAG_SMART_SUSPEND.  (For the T100 hardware I need to apply some
>>>>>>> other patches as well but those are not related to the i2c-designware or
>>>>>>> acpi issues addressed here.)
>>>>>>>
>>>>>>> On a resume from hibernation I still see one error:
>>>>>>>     "i2c_designware 80860F41:00: Error i2c_dw_xfer called while suspended"
>>>>>>> but I no longer get the i2c_designware timeouts, and audio does now work
>>>>>>> after the resume.
>>>>>>>
>>>>>>> Removing DPM_FLAG_SMART_SUSPEND may not be what you want for other
>>>>>>> hardware, but perhaps this will give you a clue as to what is going
>>>>>>> wrong with hibernate/resume on the T100TA's.
>>>>>>
>>>>>> What if you drop DPM_FLAG_LEAVE_SUSPENDED alone instead?
>>>>>>
>>>>>
>>>>> I did try dropping just DPM_FLAG_LEAVE_SUSPENDED, dropping just
>>>>> DPM_FLAG_SMART_SUSPEND, and dropping both flags.  When I just drop
>>>>> DPM_FLAG_LEAVE_SUSPENDED I still get the i2c_designware timeouts
>>>>> after the resume.  If I drop just DPM_FLAG_SMART_SUSPEND or drop both,
>>>>> then the timeouts go away.
>>>>
>>>> OK, thanks!
>>>>
>>>> Is non-hibernation system suspend affected too?
>>>
>>> I just ran some tests on a T100TA, using the 5.1-rc5 code with Hans' patch applied
>>> but without any changes to i2c-designware-platdrv.c, so the
>>> DPM_FLAG_SMART_PREPARE, DPM_FLAG_SMART_SUSPEND, and DPM_FLAG_LEAVE_SUSPENDED flags
>>> are all set.
>>>
>>> Suspend does work OK, and after resume I do NOT get any of the crippling
>>> i2c_designware timeout errors which cause sound to fail after hibernate.  I DO see one
>>>     "i2c_designware 80860F41:00: Error i2c_dw_xfer call while suspended"
>>> error on resume, just as I do on hibernate.  I've attached a portion of dmesg below.
>>> The "asus_wmi:  Unknown key 79 pressed" error is a glitch which occurs
>>> intermittently on these machines, but doesn't seem related to the other issues.
>>> I had one test run when it was absent but the rest of the messages were the
>>> same -- but then kept getting that unknown key error on all my later tries.
>>
>> I've just tried to reproduce the "Error i2c_dw_xfer call while suspended" error
>> on suspend/resume on my own T100TA and I could not reproduce this.
>>
>> Can you try without the BT keyboard paired and waking up from suspend using the
>> tablet part's power-button ?
>>
>> Also do you still have the scripts to rmmod some modules before suspend ?
>>
> 
> The T100TA keyboard is actually a hardwired connection rather than Bluetooth but I
> did physically disconnect the keyboard, and also unpaired all the actual Bluetooth
> devices (such as the mouse) and then powered down the T100TA bluetooth adapter.
> When I suspend, then resume using the tablet power button, I still get the
> i2c_dw_xfererror error during the resume.  But whatever causes this error isn't fatal,
> in the sense that after resume the sound and other i2c functions do still work OK.
> 
> While I always get this i2c_dw_xfer error on resume from suspend or hibernation on the T100TA,
> I also have a T100TAM and curiously, it NEVER shows that error -- although all the
> other suspend and hibernate behavior seems similar.  I'm not sure if the following could
> be the difference, but the T100TA uses an i2c connected ATML1000 touchscreen controller
> while the T100TAM uses an i2c connected SIS0817 touchscreen controller.  Other than that
> the hardware seems almost identical.

I've been testing on an actual T100TA, with the ATML1000 touchscreen controller.

Maybe it is a difference in BIOS version, my T100TA is running the latest BIOS, what
is the output of:

cat /sys/class/dmi/id/bios_version /sys/class/dmi/id/bios_date

?

Also do you perhaps have a microsd card inserted?  (I'm trying to figure out the
different between our setups so that I can hopefully reproduce the issue myself).


> Regarding scripts, while I do still need a systemd hibernate script which removes the
> brcmfmac and the hci_uart (bluetooth related) drivers, I've found that I no longer need
> any script for suspend.

Ok, so you are not doing any rmmod-s on suspend, right?

Regards,

Hans