Hi,
On 13-08-18 17:44, Mika Westerberg wrote:
On Sun, Aug 12, 2018 at 06:25:36PM +0200, Hans de Goede wrote:
GpioInt ACPI event handlers may see there IRQ triggered immediately
after requesting the IRQ (esp. level triggered ones). This means that they
may run before any (builtin) other drivers have had a chance to register
their OpRegion handlers, leading to errors like this:
[ 1.133274] ACPI Error: No handler for Region [PMOP] ((____ptrval____)) [UserDefinedRegion] (20180531/evregion-132)
[ 1.133286] ACPI Error: Region UserDefinedRegion (ID=141) has no handler (20180531/exfldio-265)
[ 1.133297] ACPI Error: Method parse/execution failed \_SB.GPO2._L01, AE_NOT_EXIST (20180531/psparse-516)
Hmm, according ACPI 6.2 spec (see chapter 6.5.4 explaining _REG method)
the AML code is not supposed to access OpRegions if they are not
available (e.g there is no driver loaded).
Sure, but there are plenty of cases where AML code does not always
does that and even it where to do that, from an interrupt handler
like this, that is probably a bad idea, since the handler will
clear the interrupt cause, so what ever the code would have done
if the OpRegion was in place now will not happen.
Can you share the AML that triggers the above error?
Sure but as said there is plenty of AML code around not
checking for OpRegions being registered, anyways:
https://fedorapeople.org/~jwrdegoede/acpidump.onda-v975w
Look for _L01 in the DSDT part, it is the VBUS access there
which triggers these errors.
Regards,
Hans
