Re: [v5] i2c: i801: Allow ACPI SystemIO OpRegion to conflict with PCI BAR

["Pali Rohár" <pali.rohar@gmail.com>]

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On Tuesday 05 July 2016 12:14:55 Mika Westerberg wrote:
> The whole point of this patch is that we expect that nobody never
> uses that OpRegion. I'm 99% sure you don't find a single machine
> where it is actually in use.

HP EliteBook 8460p uses it for sure! Here are DSDT snips:


                Method (\_SB.PCI0.LPCB.SMAB, 3, Serialized)
                {
                    If (LEqual (And (Arg0, 0x01), 0x00))
                    {
                        Store (0x01, Local0)
                        Store (\_SB.PCI0.SBUS.SWRB (Arg0, Arg1, Arg2), Local1)
                        If (Local1)
                        {
                            Store (0x00, Local0)
                        }
                    }
                    Else
                    {
                        Store (\_SB.PCI0.SBUS.SRDB (Arg0, Arg1), Local0)
                    }

                    Return (Local0)
                }

...

                Method (ALRD, 1, Serialized)
                {
                    Store (\_SB.PCI0.LPCB.SMAB (0x33, Arg0, 0x00), Local0)
                    Return (Local0)
                }

                Method (ALWR, 2, Serialized)
                {
                    Store (\_SB.PCI0.LPCB.SMAB (0x32, Arg0, Arg1), Local0)
                    Return (Local0)
                }


And ALRD and ALWR methods are used by hp_accel.ko kernel driver.

-- 
Pali Rohár
pali.rohar@gmail.com

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