Gah! Now with added subject line...
Following the change to strict ACPI resource checking, I'm getting error
messages about the i2c_i801 driver conflicting:
[ 5.892659] i801_smbus 0000:00:1f.3: PCI INT C -> GSI 18 (level, low) ->
IRQ 18
[ 5.892711] ACPI: I/O resource 0000:00:1f.3 [0x400-0x41f] conflicts with
ACPI region SMRG [0x400-0x40f]
[ 5.892755] ACPI: If an ACPI driver is available for this device, you
should use it instead of the native driver
Clearly the resource checking is the right way to go, so I started to
investigate an ACPI-capable driver for the i801 I2C bus. The i2c-scmi driver
looks plausible, but doesn't work immediately. (Note that the asus_atk0110
driver works fine for the sensors via ACPI, but there are other devices on
the I2C bus e.g. DIMM SPDs)
The ACPI tables on this box (ASUS P5K-E) don't have a defined EC, or any
device with PNP0C09, ACPI0001 or ACPI0005 HIDs. They do however, define the
SMRG region and a series of methods to access the I2C bus.
I'd like some recommendation for the best approach:
a) Tweak the DSDT for myself to provide a device which will conform to a
standard, then use a standard driver. Obviously not a very palatable solution
for others.
b) Some form of automatic fixup when the ACPI tables are parsed, although the
method names appear a little arbitrary - it's not simply a case of a missing
_HID.
c) Forget about it, use acpi_enforce_resources=lax, and just hope I never get
an unlocked race (not preferred!)
d) Something else I clearly haven't thought of (most likely)
Clearly the ACPI tables lacking the bus device is a problem fairly particular
to this hardware, and the fix is likely to be targetted, but I'd like to make
it as universal as possible. If I can get an ACPI driver working, and fix
this for more than just myself, then brilliant.
--
Peter Denison <peterd at marshadder dot org>
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