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SubjectRe: [PATCH] ELAN touchpad i2c_hid bugs fix
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> On Mar 21, 2019, at 4:55 PM, Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
>
> On Thu, Mar 21, 2019 at 6:08 AM Kai-Heng Feng
> <kai.heng.feng@canonical.com> wrote:
>> at 01:18, Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
>>> On Wed, Mar 20, 2019 at 6:55 PM Kai-Heng Feng
>>> <kai.heng.feng@canonical.com> wrote:
>>>> at 23:39, Hans de Goede <hdegoede@redhat.com> wrote:
>>>>> On 3/20/19 3:37 PM, Benjamin Tissoires wrote:
>
>>>> Recently we found that Elan touchpad doesn’t like GpioInt() from its _CRS.
>>>> Once the Interrupt() is used instead, the issue goes away.
>>>
>>> IIRC i2c core tries to get interrupt from Interrupt() resource and
>>> then falls back to GpioInt().
>>> See i2c_acpi_get_info() and i2c_device_probe().
>>
>> Here’s its ASL:
>
>> Name (SBFB, ResourceTemplate ()
>> {
>> I2cSerialBusV2 (0x002C, ControllerInitiated, 0x00061A80,
>> AddressingMode7Bit, "\\_SB.PCI0.I2C4",
>> 0x00, ResourceConsumer, , Exclusive,
>> )
>> })
>> Name (SBFG, ResourceTemplate ()
>> {
>> GpioInt (Level, ActiveLow, ExclusiveAndWake, PullUp, 0x0000,
>> "\\_SB.GPO1", 0x00, ResourceConsumer, ,
>> )
>> { // Pin list
>> 0x0012
>> }
>> })
>> Name (SBFI, ResourceTemplate ()
>> {
>> Interrupt (ResourceConsumer, Level, ActiveLow, ExclusiveAndWake, ,, )
>> {
>> 0x0000003C,
>> }
>> })
>
>> Method (_CRS, 0, NotSerialized) // _CRS: Current Resource Settings
>> {
>
>> If ((OSYS < 0x07DC))
>> {
>> Return (SBFI) /* \_SB_.PCI0.I2C4.TPD0.SBFI */
>> }
>
> This will return only Interrupt() resource
>
>>
>> Return (ConcatenateResTemplate (SBFB, SBFG))
>
> This one I2cSerialBus() and GpioInt().
>
>> }
>
>
>> }
>> }
>>
>> Change SBFG to SBFI in its _CRS can workaround the issue.
>> Is ASL in this form possible to do the flow you described?
>
> Since it's enumerated in Linux as I2C device, it means it gets I2C and
> GPIO resources.
> So, no, it's not possible.
>
> What are you describing might tell us about one of the following:
> - touchpad should be switched to PS/2 mode in order to get working
> - GPIO resource is not correct / bug in GPIO driver
>
> I don't believe the first one is a case here.
> If GPIO resource is not correct and main OS has some quirks, we need
> to do similar in Linux.

How do I check quirks on Windows?

> Otherwise, debugging GPIO driver, starting from what exactly (pin
> number, pin settings, etc) gets i2c-hid module.

Ok, please let me know where should I start looking into.

>
> Note, ACPICA and related stuff is done in order to be Windows compatible.
> If you have settings in BIOS that defines OS to boot, it should be
> chosen Windows.

Yes, it’s Windows.

Kai-Heng

>
> --
> With Best Regards,
> Andy Shevchenko

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