Hi Keith,
Many ACPI devices use an EISAID for their _HID, and I believe that Linux's
ACPICPA converts an EISAID to a string for _HID matching.
You could try something like this instead (you can see in the Linux sources
there are 3 ACPI _HID matches, and this is one of them).
`Name(_HID, EISAID("SMBUS01")) `.
Cheers,
-Tim
On Mon, May 25, 2020 at 5:39 AM Paul Menzel <[email protected]> wrote:
> Dear Keith,
>
>
> Am 25.05.20 um 02:05 schrieb Keith Hui:
> > I am attempting to build SCMI [1] support for the DSDT for asus/p3b-f
> > to get around a PCI<->ACPI resource conflict that renders the whole
> > SMBus and the hardware monitor inoperative. The board has ACPI AML
> > hooks that run before and after suspend and resume, so my plan is to
> > have Linux access the SMBus exclusively through ACPI, using the driver
> > i2c-scmi.
> >
> > The spec calls for methods _SBI, _SBR, _SBW, _SBT, _SBA. I don't need
> > the last two for my purpose so I'll skip them. During build iasl warns
> > that they are unrecognized reserved methods and **our build process
> > treats all warning as errors** so my build broke.
>
> I created a bug report for iasl [1].
>
> What is the error number? Please look into `IGNORED_IASL_WARNINGS` in
> `Makefile.inc` how certain iasl warnings can be ignored.
>
> > The driver knows that some IBM bioses implementing the methods without
> > the leading underscores, but it only expects this on devices with an
> > _HID of "SMBUSIBM". If I use this _HID, iasl errors out: "_HID suffix
> > must be all hex digits (SIBM)", so I have to use SMB0001, for which
> > i2c-scmi would only look for the _SB? methods, that from what I can
> > see is the correct way. So either my build breaks, or I can expect a
> > build that is not going to work.
>
> Please contact the Linux maintainers.
>
> > I cannot proceed unless I hack the build process (I send in a patch to
> > Makefile.inc to make an exception for p3b-f) to disregard iasl
> > warnings.
>
> Ah, looks like you found my suggestion already.
>
> > And if I resolve the conflict by removing all ASL code for SMBus
> > access, I would have no working suspend, even S1.
> >
> > What am I supposed to do?
>
>
> Kind regards,
>
> Paul
>
>
> > [1] http://smbus.org/specs/smbus_cmi10.pdf
> [2]: https://bugs.acpica.org/show_bug.cgi?id=1530
> "Add _SBI, _SBR, _SBW, _SBT, _SBA to reserved methods"
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