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ec/system76/ec: Preserve ECOS through suspend 

When the EC is reset on PLTRST this information will be lost, causing
system control interrupts to potentially stop functioning.

Change-Id: I137ef6c574a372601bc51f6e815158767acd0e1b
Signed-off-by: Jeremy Soller <jeremy@system76.com>
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50489
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Jeremy Soller 2021-02-10 10:26:14 -07:00 committed by Patrick Georgi
parent 9bce1fe727
commit ff687b1f24
1 changed files with 7 additions and 0 deletions
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7
src/ec/system76/ec/acpi/ec.asl
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@ -62,9 +62,13 @@ Device (\_SB.PCI0.LPCB.EC0)
}
}
Name (S3OS, Zero)
Method (PTS, 1, Serialized) {
Debug = Concatenate("EC: PTS: ", ToHexString(Arg0))
If (ECOK) {
// Save ECOS during sleep
S3OS = ECOS
// Clear wake cause
WFNO = Zero
}
@ -73,6 +77,9 @@ Device (\_SB.PCI0.LPCB.EC0)
Method (WAK, 1, Serialized) {
Debug = Concatenate("EC: WAK: ", ToHexString(Arg0))
If (ECOK) {
// Restore ECOS after sleep
ECOS = S3OS
// Set current AC state
^^^^AC.ACFG = ADP