Hi,
On 25-09-18 22:47, Grygorii Strashko wrote:
On 09/23/2018 09:00 AM, Hans de Goede wrote:
On most Intel Bay- and Cherry-Trail systems the PMIC is connected over I2C
and the PMIC is accessed through various means by the _PS0 and _PS3 ACPI
methods (power on / off methods) of various devices.
This leads to suspend/resume ordering problems where a device may be
resumed and get its _PS0 method executed before the I2C controller is
resumed. On Cherry Trail this leads to errors like these:
i2c_designware 808622C1:06: controller timed out
ACPI Error: AE_ERROR, Returned by Handler for [UserDefinedRegion]
ACPI Error: Method parse/execution failed \_SB.P18W._ON, AE_ERROR
video LNXVIDEO:00: Failed to change power state to D0
Hm. There should some dependency from PM domain (or smth. like this) which, in turn should depends from i2c.
Yes and I've a patchset pending to fix the dependency missing in this
specific case. But there might be other cases where we miss the dependency
the idea behind this patch / behind the generic solution Wolfram is
working on which will replace this patch / is to make it easier to
catch/debug cases where such a dependency is missing.
Regards,
Hans
