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SubjectRE: [PATCH] ELAN touchpad i2c_hid bugs fix
Date
> -----Original Message-----
> From: Kai Heng Feng <kai.heng.feng@canonical.com>
> Sent: Monday, April 1, 2019 11:18 PM
> To: Limonciello, Mario
> Cc: Andy Shevchenko; hdegoede@redhat.com; benjamin.tissoires@redhat.com;
> hotwater438@tutanota.com; jikos@kernel.org; swboyd@chromium.org;
> bigeasy@linutronix.de; dtor@chromium.org; linux-input@vger.kernel.org; linux-
> kernel@vger.kernel.org
> Subject: Re: [PATCH] ELAN touchpad i2c_hid bugs fix
>
>
> [EXTERNAL EMAIL]
>
>
>
> > On Apr 2, 2019, at 5:37 AM, <Mario.Limonciello@dell.com>
> > <Mario.Limonciello@dell.com> wrote:
> >
> >> -----Original Message-----
> >> From: Andy Shevchenko <andy.shevchenko@gmail.com>
> >> Sent: Thursday, March 21, 2019 4:48 AM
> >> To: Kai-Heng Feng; Limonciello, Mario
> >> Cc: Hans de Goede; Benjamin Tissoires; hotwater438@tutanota.com; Jiri
> >> Kosina;
> >> Stephen Boyd; Sebastian Andrzej Siewior; Dmitry Torokhov; open list:HID
> >> CORE
> >> LAYER; lkml
> >> Subject: Re: [PATCH] ELAN touchpad i2c_hid bugs fix
> >>
> >>
> >> [EXTERNAL EMAIL]
> >>
> >> +Cc: Mario
> >>
> >> Mario, do you have any insights about the issue with touchpad on Dell
> >> system described below?
> >
> > My apologies, this got lost while I was on vacation.
> >
> >>
> >> 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:
> >>>>
> >>>>>> 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.
> >
> > Is this pre-production HW? If so, maybe this is a case that we should talk
> > about custom OSI string to run the ASL differently.
>
> Some are already shipped.
>
>
> >
> > The other option would be to create a new ASL method in FW and from Linux
> > side a quirk that calls this new ASL method.
> >
>
> Since this patch is for ASUS Laptop, I think a more generic solution from
> driver layer is preferred.
>

I thought this ASL was from Dell laptop. The HID make it looks like it at least.
> >>> Name (_HID, "DELL08AE") // _HID: Hardware ID

In general more generic solution from driver layer is preferred I agree. You might
need to check with ACPI guys to see if they have some ideas on situations that
GpioInt fail.

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