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SubjectRe: [PATCH] ELAN touchpad i2c_hid bugs fix
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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:
>
>>> Benjamin, what I find interesting here is that the BOGUS_IRQ quirk
>>> is also used on Elan devices, I suspect that these Elan devices
>>> likely also need the I2C_HID_QUIRK_FORCE_TRIGGER_FALLING quirk
>>> and then they probably will no longer need the bogus IRQ flag,
>>> if you know about bugreports with an acpidump for any of the devices
>>> needing the bogus IRQ quirk, then I (or you) can check how the IRQ is
>>> declared there, I suspect it will be declared as level-low, just like
>>> with the laptop this patch was written for. And it probably need to
>>> be edge-falling instead of level-low just like this case.
>>
>> First, I’ve already tried using IRQF_TRIGGER_FALLING, unfortunately it
>> doesn’t solve the issue for me.
>>
>> I talked to Elan once, and they confirm the correct IRQ trigger is level
>> low. So forcing falling trigger may break other platforms.
>
> As far as I understood Vladislav the quirk he got from Elan as well.

Ok, then this is really weird.

>
>> 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:

Scope (\_SB.PCI0.I2C4)
{
Device (TPD0)
{
Name (_ADR, One) // _ADR: Address
Name (_HID, "DELL08AE") // _HID: Hardware ID
Name (_CID, "PNP0C50" /* HID Protocol Device (I2C bus) */) // _CID: Compatible ID
Name (_UID, One) // _UID: Unique ID
Name (_S0W, 0x04) // _S0W: S0 Device Wake State
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 (_INI, 0, NotSerialized) // _INI: Initialize
{
}
Method (_STA, 0, NotSerialized) // _STA: Status
{
If ((TCPD == One))
{
Return (0x0F)
}

Return (Zero)
}
Method (_CRS, 0, NotSerialized) // _CRS: Current Resource Settings
{
If ((OSYS < 0x07DC))
{
Return (SBFI) /* \_SB_.PCI0.I2C4.TPD0.SBFI */
}

Return (ConcatenateResTemplate (SBFB, SBFG))
}
Method (_DSM, 4, NotSerialized) // _DSM: Device-Specific Method
{
If ((Arg0 == ToUUID ("3cdff6f7-4267-4555-ad05-b30a3d8938de") /* HID I2C Device */))
{
If ((Arg2 == Zero))
{
If ((Arg1 == One))
{
Return (Buffer (One)
{
0x03 // .
})
}
Else
{
Return (Buffer (One)
{
0x00 // .
})
}
}
ElseIf ((Arg2 == One))
{
Return (0x20)
}
Else
{
Return (Buffer (One)
{
0x00 // .
})
}
}
ElseIf ((Arg0 == ToUUID ("ef87eb82-f951-46da-84ec-14871ac6f84b")))
{
If ((Arg2 == Zero))
{
If ((Arg1 == One))
{
Return (Buffer (One)
{
0x03 // .
})
}
}

If ((Arg2 == One))
{
Return (ConcatenateResTemplate (SBFB, SBFG))
}

Return (Buffer (One)
{
0x00 // .
})
}
}
Else
{
Return (Buffer (One)
{
0x00 // .
})
}
}
}
}

Change SBFG to SBFI in its _CRS can workaround the issue.
Is ASL in this form possible to do the flow you described?

Kai-Heng

>
>> But I am not sure how to patch its DSDT/SSDT in i2c-hid.
>
> --
> With Best Regards,
> Andy Shevchenko


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