Re: [PATCH] ELAN touchpad i2c_hid bugs fix

[Andy Shevchenko]

+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@xxxxxxxxxxxxx> wrote:
>
> at 01:18, Andy Shevchenko <andy.shevchenko@xxxxxxxxx> wrote:
>
> > On Wed, Mar 20, 2019 at 6:55 PM Kai-Heng Feng
> > <kai.heng.feng@xxxxxxxxxxxxx> wrote:
> >> at 23:39, Hans de Goede <hdegoede@xxxxxxxxxx> 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, Iâve already tried using IRQF_TRIGGER_FALLING, unfortunately it
> >> doesnât 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 doesnât 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().
>
> Hereâs 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