lkml.org 
[lkml]   [2019]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] ELAN touchpad i2c_hid bugs fix
+Cc: Mario

Mario, do you have any insights about the issue with touchpad on Dell
system described below?

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


--
With Best Regards,
Andy Shevchenko

\
 
 \ /
  Last update: 2019-03-21 10:48    [W:0.085 / U:5.764 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site