linux-kernel - Re: [RFC 0/4] Intel Integrated Sensor Hub Support (ISH)

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Date:	Wed, 01 Jun 2016 15:36:44 +0200
From:	Atri Bhattacharya <badshah400@....com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/4] Intel Integrated Sensor Hub Support (ISH)

Hi!

On Mon, 2016-05-30 at 21:27 -0700, Srinivas Pandruvada wrote:
> Starting from Cherrytrail, multiple generation of Intel processors
> offers
> on package sensor hub. Several recent tablets, 2-in-1 convertible
> laptops
> are using ISH instead of external sensor hubs. This resulted in lack
> of
> support of sensor function like device rotation and auto backlight
> adjustment. In addition, depending on the OEM implementation, support
> of ISH
> is required to support low power sleep states.
> 
> The support of ISH on Linux platforms is not new. Android platforms
> with
> Intel SoCs had this support for a while submitted by Daniel Drubin. 
> This patcheset is reusing most of those changes with  clean up and
> removing Android platform specific changes.
> 
> This series is tested on:
> - Lenovo Yoga 260 with Skylake processor
> - HP Pavilion x2 detachable with Cherrytrail 
> 
> The user mode ABI is still same as external sensor hubs using Linux
> IIO. So existing user mode software should still work without change.
> This series primarily brings in new HID transport used in ISH.
> 
> This series submitted as a RFC to try on several devices. We have 
> received request from Linux users who wanted this support. So I hope
> all
> those users try and give feedback.
> 

Thanks a lot for adding support for this. I have a Lenovo Thinkpad Yoga
260, so I decided to give it a try. I used your patches on kernel 4.6.0
and installed the patched kernel. Now, I see that the device is
recognised immediately. I use the iio-sensor-proxy application from
[1], and it now recognises the sensors. But changing orientation
doesn't seem to do anything, and moreover upon a wakeup from suspend I
see the following messages on the journal:

Jun 01 15:15:09 tp-yoga260 kernel: [drm] RC6 on
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0001:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0001:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0001:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0001:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0001:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0001:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0001:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0001:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0002:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0002:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0002:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: hid-sensor-hub 0044:8086:22D8.0002:
timeout waiting for response from ISHTP device
Jun 01 15:15:09 tp-yoga260 kernel: PM: resume of devices complete after
37095.288 msecs

Also suspend and wakeup seems to be really slow now. Please let me know
if there is any other info I can provide.

Thanks and best wishes.

[1] https://github.com/hadess/iio-sensor-proxy

-- 
Atri Bhattacharya
Wed  1 Jun 15:22:32 CEST 2016

Sent from openSUSE Tumbleweed (20160529) (x86_64) on my laptop.