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-rw-r--r--include/acpi/acconfig.h18
1 files changed, 13 insertions, 5 deletions
diff --git a/include/acpi/acconfig.h b/include/acpi/acconfig.h
index 0f875ae68c68..53c088247d36 100644
--- a/include/acpi/acconfig.h
+++ b/include/acpi/acconfig.h
@@ -173,12 +173,20 @@
#define ACPI_RSDP_CHECKSUM_LENGTH 20
#define ACPI_RSDP_XCHECKSUM_LENGTH 36
-/* SMBus, GSBus and IPMI bidirectional buffer size */
+/*
+ * SMBus, GSBus and IPMI buffer sizes. All have a 2-byte header,
+ * containing both Status and Length.
+ */
+#define ACPI_SERIAL_HEADER_SIZE 2 /* Common for below. Status and Length fields */
+
+#define ACPI_SMBUS_DATA_SIZE 32
+#define ACPI_SMBUS_BUFFER_SIZE ACPI_SERIAL_HEADER_SIZE + ACPI_SMBUS_DATA_SIZE
+
+#define ACPI_IPMI_DATA_SIZE 64
+#define ACPI_IPMI_BUFFER_SIZE ACPI_SERIAL_HEADER_SIZE + ACPI_IPMI_DATA_SIZE
-#define ACPI_SMBUS_BUFFER_SIZE 34
-#define ACPI_IPMI_BUFFER_SIZE 66
-#define ACPI_GSBUS_BUFFER_SIZE 34 /* Not clear if this is needed */
-#define ACPI_MAX_GSBUS_BUFFER_SIZE 255 /* Worst-case bidirectional buffer */
+#define ACPI_MAX_GSBUS_DATA_SIZE 255
+#define ACPI_MAX_GSBUS_BUFFER_SIZE ACPI_SERIAL_HEADER_SIZE + ACPI_MAX_GSBUS_DATA_SIZE
/* _sx_d and _sx_w control methods */