[S] Change in coreboot[master]: ec/google/wilco/acpi: Add DPTF RCDP() method

[Paul Fagerburg (Code Review)]

Paul Fagerburg has submitted this change. ( https://review.coreboot.org/c/coreboot/+/72578 )

Change subject: ec/google/wilco/acpi: Add DPTF RCDP() method
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ec/google/wilco/acpi: Add DPTF RCDP() method

The Windows DPTF drivers expect this method, and if not present appear
to hang. Adding this method fixes DPTF under Windows on drallion.

Modeled after existing method used by chrome-ec.

TEST=build/boot Win11 on google/drallion, verify DPTF functional.

Change-Id: I6570345379da413273251ecf5209c4997aac9b11
Original-patch-by: Coolstar 
Signed-off-by: Matt DeVillier 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72578
Tested-by: build bot (Jenkins) 
Reviewed-by: Eric Lai 
Reviewed-by: Caveh Jalali 
---
M src/ec/google/wilco/acpi/dptf.asl
1 file changed, 37 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Caveh Jalali: Looks good to me, but someone else must approve
  Eric Lai: Looks good to me, approved

diff --git a/src/ec/google/wilco/acpi/dptf.asl b/src/ec/google/wilco/acpi/dptf.asl
index 6de72e8..1b2bf80 100644
--- a/src/ec/google/wilco/acpi/dptf.asl
+++ b/src/ec/google/wilco/acpi/dptf.asl
@@ -116,3 +116,18 @@
    /* Clear sensor events */
    W (DWTQ, Local0)
 }
+
+#ifdef EC_ENABLE_MULTIPLE_DPTF_PROFILES
+/*
+ * Read current Device DPTF Profile Number
+ */
+Method (RCDP, 0, NotSerialized)
+{
+	Local0 = R(DRTI)
+	If (Local0 == 0) {
+		Return (R(OTBL))
+	} else {
+		Return (Local0 - 1)
+	}
+}
+#endif