https://bugzilla.kernel.org/show_bug.cgi?id=177111
Bug ID: 177111
Summary: i2c_designware: Unmet (power) dependencies
Product: ACPI
Version: 2.5
Kernel Version: 4.8
Hardware: Intel
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Other
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 241231
--> https://bugzilla.kernel.org/attachment.cgi?id=241231&action=edit
DSDT
On my Asus T100HAN, cherry trail based computer, running
i2cdetect on all i2c busses works, except on bus 4.
i2cdetect results in several:
--
i2c_designware 808622C1:04: controller timed out
..
--
until I press ctrl-c.
I think it has something to do with that bus 4 has different
(power?) dependencies than the other buses.
>From DSDT:
The other i2c busses:
--
Name (_DEP, Package (0x01) // _DEP: Dependencies
{
PEPD
})
--
Bus 4:
--
Name (_DEP, Package (0x02) // _DEP: Dependencies
{
PEPD,
GPO0
})
--
Device (GPI0) is:
--
Name (_HID, "INT33FF") // _HID: Hardware ID
General Purpose Input/Output (GPIO) controller - SOUTHWEST
--
It looks like not just powering GPO0 is enough, but some fiddling with gpios
is needed in both power state 0 and 3.
See attached dsdt
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