[Intel-gfx] [PATCH] ACPI / bus: Introduce a list of ids for "always present" devices

[Hans de Goede]

Hi,

On 27-02-17 23:53, Takashi Iwai wrote:
> On Mon, 27 Feb 2017 22:27:58 +0100,
> Rafael J. Wysocki wrote:
>>
>> On Mon, Feb 27, 2017 at 3:40 PM, Takashi Iwai <tiwai at suse.de> wrote:

<snip>

>>> Oh, this is interesting, please let me join to the party.
>>>
>>> We've hit a similar problem, but for other one: namely, it's INT0002
>>> that is found on a few CHT devices.  It's never bound properly by a
>>> similar reason, where _STA is always zero on Linux:
>>>
>>>             Method (_STA, 0, NotSerialized)  // _STA: Status
>>>             {
>>>                 If (SOCS <= 0x04)
>>>                 {
>>>                     Return (0x0F)
>>>                 }
>>>                 Else
>>>                 {
>>>                     Return (Zero)
>>>                 }
>>>             }
>>>
>>> The device is supposed to be a "virtual GPIO" stuff, and the driver
>>> hasn't been upstreamed from Intel.  Due to the lack of this driver
>>> (and it's binding), the machine gets spurious IRQ#9 after the PM
>>> resume, and it locks up at the second time of PM.
>>
>> Well, the solution here seems to be to acquire the missing driver
>> instead of adding quirks to the ACPI core.
>
> The driver is available (not upstreamed, though), but it's not bound
> due to _STA above.  That's why I'm interested in this thread.

Takashi thanks for pointing me to the INT0002 device / driver to
fix the spurious IRQ#9 after the PM resume issue. I was seeing this
on the GPD-win too (when suspending with power-button + wakeup with
spacebar). I've added a patch to add the INT0002 device to the
always present device list + cleaned up the INT0002 driver. I plan
to submit this upstream soon.

If you want to test this on your device you need these patches:

https://github.com/jwrdegoede/linux-sunxi/commit/a1a6e92f2665376ed72f575553238a93e88bb037
https://github.com/jwrdegoede/linux-sunxi/commit/4946f68f8eaa300f42289bf767722d78cf7fa9e2
https://github.com/jwrdegoede/linux-sunxi/commit/32640c816dd60d17f003ae8306863da01c215afb
https://github.com/jwrdegoede/linux-sunxi/commit/abb6a9d69690bb2a1a00b184b06cdae43d6ad001

Regards,

Hans