linux-kernel - Re: [PATCH] pinctrl-baytrail: fix for irq descriptor conflict on ASUS T100TA

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Date:	Wed, 23 Apr 2014 15:23:44 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Adam Williamson <awilliam@...hat.com>
Cc:	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	"Jin, Yao" <yao.jin@...ux.intel.com>,
	Linus Walleij <linus.walleij@...aro.org>, alan@...ux.intel.com,
	mathias.nyman@...el.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl-baytrail: fix for irq descriptor conflict on
 ASUS T100TA

On Wed, Apr 23, 2014 at 11:34:30AM +0300, Mika Westerberg wrote:
> On Tue, Apr 22, 2014 at 10:16:50PM -0700, Adam Williamson wrote:
> > Well, I can't actually concur. See my results in
> > https://bugzilla.kernel.org/show_bug.cgi?id=68291#c44 .
> > 
> > 1. A kernel with neither patch applied (and no hid-rmi driver) results
> > in a working touchscreen.
> > 2. A kernel with only v3 of Doug's patch from
> > https://bugzilla.kernel.org/show_bug.cgi?id=67921 results in a working
> > touchscreen.
> > 3. A kernel with both v3 of Doug's patch and this IRQ descriptor
> > conflict "fix" results in a broken touchscreen.
> > 
> > Seems to me there really is some kind of problem with this patch...
> 
> Can you try so that you have both patches applied and then this one? I'm
> suspecting that the ACPI GPIO operation region support might do something
> unexpected in this case.

I'm able to reproduce this problem here now and it seems not related to the
ACPI GPIO operation regions.

This patch changes call to irq_domain_add_linear() to
irq_domain_add_simple() and somehow that changes the behaviour so that I
get non-working touchscreen:

...
[   37.434998] i2c_hid i2c-ATML1000:00: failed to reset device.
[   37.435009] i2c_hid i2c-ATML1000:00: i2c_hid_set_power
[   37.435021] i2c_hid i2c-ATML1000:00: __i2c_hid_command: cmd=fb 00 01 08
[   38.439897] i2c_hid i2c-ATML1000:00: can't add hid device: -61
[   38.440749] i2c_hid: probe of i2c-ATML1000:00 failed with error -61

It never gets an interrupt when the device reset is ready.

Jin, do you have any idea what is going on?
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