linux-kernel - Re: [RESEND] Lenovo Yoga 900 touchpad issues

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Date:	Wed, 16 Dec 2015 14:18:04 +0100 (CET)
From:	Jiri Kosina <jikos@...nel.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
cc:	Nish Aravamudan <nish.aravamudan@...il.com>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Andrew Duggan <aduggan@...aptics.com>,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	linux-input@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND] Lenovo Yoga 900 touchpad issues

On Wed, 16 Dec 2015, Mika Westerberg wrote:

> > [Apologies for the resend, didn't realize I hadn't changed my GMail settings
> > to not use HTML.]
> > 
> > I have recently purchased a Lenovo Yoga 900 and most everything is working
> > with a slightly modified 4.4-rc5 (https://lkml.org/lkml/2015/11/30/441 applied
> > to enable the touchpad itself), I am seeing two issues:
> > 
> > 1) On suspend/resume, the touchpad is non-functional. A `modprobe -r i2c-hid;
> >  modprobe i2c-hid` "fixes" it.
> > 
> > The kernel emits:
> > 
> > i2c_hid i2c-SYNA2B29:00: failed to reset device.
> > dpm_run_callback(): i2c_hid_resume+0x0/0xc0 [i2c_hid] returns -61
> > PM: Device i2c-SYNA2B29:00 failed to resume: error -61
> > 
> > During the resume. So perhaps this is a timing issue (given that once
> > resumed, the
> > module reload does work?).
> 
> Linus noticed this as well and Jiri suggested the below patch which
> seemed to fix the issue (although it increased resume time a bit).
> 
> I was supposed to get one Lenovo Yoga 900 here to debug this issue but
> I'm still waiting for it (sloow big corporation bureaucracy takes some
> time to get things purchased outside).
> 
> diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
> index 55d8f9d..52dd03a0 100644
> --- a/drivers/hid/i2c-hid/i2c-hid.c
> +++ b/drivers/hid/i2c-hid/i2c-hid.c
> @@ -1121,10 +1121,16 @@ static int i2c_hid_resume(struct device *dev)
>  	struct i2c_client *client = to_i2c_client(dev);
>  	struct i2c_hid *ihid = i2c_get_clientdata(client);
>  	struct hid_device *hid = ihid->hid;
> -	int wake_status;
> +	int wake_status, tries = 3;
>  
>  	enable_irq(ihid->irq);
> -	ret = i2c_hid_hwreset(client);
> +
> +	do {
> +		ret = i2c_hid_hwreset(client);
> +		if (ret)
> +			msleep(1000);
> +	} while (tries-- > 0 && ret);
> +
>  	if (ret)
>  		return ret;

As a possible alternative, please test the patch above on top of for-next 
branch of 

	git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid.git

It contains 64bebefcf3 ("HID: enable hid device to suspend/resume 
asynchronously") and knowing whether that changes something might be 
interesting datapoint as well.

Thanks,

-- 
Jiri Kosina
SUSE Labs

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