[PATCH] ACPICA: ACPI 6.1: Add PCC HW-Reduced Communication Subspace Type 2

[hotran <hotran@apm.com>]

ACPI 6.1 PCC has a HW-Reduced Communication Subspace Type 2 intended for
using on HW-Reduce ACPI Platform, which requires read-modify-write sequence
to acknowledge doorbell interrupt. This patch adds the Communication
Subspace Type 2.

Signed-off-by: Hoan Tran <hotran@apm.com>
---
 include/acpi/actbl3.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/acpi/actbl3.h b/include/acpi/actbl3.h
index ddf5e66..5937075 100644
--- a/include/acpi/actbl3.h
+++ b/include/acpi/actbl3.h
@@ -476,7 +476,8 @@ struct acpi_table_pcct {
 enum acpi_pcct_type {
 	ACPI_PCCT_TYPE_GENERIC_SUBSPACE = 0,
 	ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE = 1,
-	ACPI_PCCT_TYPE_RESERVED = 2	/* 2 and greater are reserved */
+	ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2 = 2,
+	ACPI_PCCT_TYPE_RESERVED = 3	/* 3 and greater are reserved */
 };
 
 /*
@@ -498,7 +499,7 @@ struct acpi_pcct_subspace {
 	u16 min_turnaround_time;
 };
 
-/* 1: HW-reduced Communications Subspace (ACPI 5.1) */
+/* 1 or 2: HW-reduced Communications Subspace (ACPI 6.1) */
 
 struct acpi_pcct_hw_reduced {
 	struct acpi_subtable_header header;
@@ -513,6 +514,9 @@ struct acpi_pcct_hw_reduced {
 	u32 latency;
 	u32 max_access_rate;
 	u16 min_turnaround_time;
+	struct acpi_generic_address doorbell_ack_register;
+	u64 ack_preserve_mask;
+	u64 ack_write_mask;
 };
 
 /* Values for doorbell flags above */
-- 
1.9.1


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