ec/google: Notify DPTF driver power participant on PD event

The DPTF power participant device needs to be notified when power
source changes so it can re-evaluate power source and power source
change count, this can be later used by DPTF along with methods
provided by EC.

Corresponding changes in EC are https://crrev.com/c/3545778 and
https://crrev.com/c/3547317

BUG=b:205928013
TEST=Build, boot brya0 and dump DSDT to check change

Signed-off-by: Varshit B Pandya <varshit.b.pandya@intel.com>
Change-Id: I07f58b928a0dba92bec3817177142c586e5014b9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62946
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>

src/ec/google/chromeec/acpi/ec.asl

@@ -6,6 +6,9 @@
  * re-evaluate their _PPC and _CST tables.
  */
 
+// DTT Power Participant Device Notification
+#define POWER_STATE_CHANGE_NOTIFICATION 0x81
+
 // Mainboard specific throttle handler
 #ifdef DPTF_ENABLE_CHARGER
 External (\_SB.DPTF.TCHG, DeviceObj)
@@ -15,6 +18,8 @@ External (\_SB.DPTF.TCHG, DeviceObj)
 External(\_SB.DPTC, MethodObj)
 #endif
 
+External (\_SB.DPTF.TPWR, DeviceObj)
+
 Device (EC0)
 {
 	Name (_HID, EISAID ("PNP0C09"))
@@ -82,6 +87,7 @@ Device (EC0)
 		BTID, 8,	// Battery index that host wants to read
 		USPP, 8,	// USB Port Power
 		RFWU, 8,	// Retimer Firmware Update
+		PBOK, 8,	// Power source change count from dptf
 	}
 
 #if CONFIG(EC_GOOGLE_CHROMEEC_ACPI_MEMMAP)
@@ -345,6 +351,9 @@ Device (EC0)
 	{
 		Printf ("EC: GOT PD EVENT")
 		Notify (\_SB.PCI0.LPCB.EC0.CREC.ECPD, 0x80)
+		If (CondRefOf (\_SB.DPTF.TPWR)) {
+			Notify (\_SB.DPTF.TPWR, POWER_STATE_CHANGE_NOTIFICATION)
+		}
 	}
 #endif
 

src/ec/google/chromeec/acpi/emem.asl

@@ -51,3 +51,5 @@ Offset (0x80),
 ALS0, 16,	// ALS reading 0 in lux
 Offset (0xa6),
 GPUD, 8,	// GPU Data
+Offset (0xa7),
+PWRT, 8,	// Power source and change count