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RE: [PATCH] hid: intel_ish-hid: ipc: register more pm callbacks to support hibernation

Ok, sure, I will update patch comments and resubmit.
Thanks Srinivas!

Best Regards,
Even Xu

-----Original Message-----
From: Srinivas Pandruvada [mailto:srinivas.pandruvada@xxxxxxxxxxxxxxx] 
Sent: Tuesday, June 12, 2018 11:31 PM
To: Jiri Kosina <jikos@xxxxxxxxxx>; Xu, Even <even.xu@xxxxxxxxx>
Cc: benjamin.tissoires@xxxxxxxxxx; linux-input@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Xu, Even <even.xu@xxxxxxxxx>
Subject: Re: [PATCH] hid: intel_ish-hid: ipc: register more pm callbacks to support hibernation

On Tue, 2018-06-12 at 16:53 +0200, Jiri Kosina wrote:
> On Sun, 10 Jun 2018, Srinivas Pandruvada wrote:
> > From: Even Xu <even.xu@xxxxxxxxx>
> > 
> > Current ish driver only register resume/suspend PM callbacks which 
> > don't support hibernation (suspend to disk). Now use the
> > SIMPLE_DEV_PM_OPS() MACRO instead of struct dev_pm_ops directly.
> > The suspend and resume functions will now be used for both suspend 
> > to RAM and hibernation.
> > 
> > If power management is disable, SIMPLE_DEV_PM_OPS will do nothing, 
> > the suspend and resume related functions won't be used, so mark them 
> > as __maybe_unused to clarify that this is intended behavior, and 
> > remove #ifdefs for power management.
> This describes details the patch does on code level, but what are the 
> user observable effects? Hibernation resume doesn't fail any more?
> Hibernation
> is possible (and wasn't before)? Did kernel crash while trying to 
> hibernate and this is the fix? Or ... ?
Can you add more details and resubmit ASAP?

Basically after hiberation, the ISH can't resume properly and user may not see sensor events (for example: screen rotation may not work).
User will not see a crash or panic or anything except the following message in log:
hid-sensor-hub 001F:8086:22D8.0001: timeout waiting for response from ISHTP device 

So this is adding support for S4/hiberbation to ISH.


> Thanks,