[PATCH] acpi: Add NHLT table signature

[Cezary Rojewski]

NHLT (Non-HDAudio Link Table) provides configuration of audio
endpoints for Intel SST (Smart Sound Technology) DSP products. Similarly
to other ACPI tables, data provided by BIOS may not describe it
correctly, thus overriding is required.

ACPI override mechanism checks for unknown signature before proceeding.
Update known signatures array to support NHLT.

CC: Erik Kaneda <erik.kaneda@xxxxxxxxx>
CC: Robert Moore <robert.moore@xxxxxxxxx>
CC: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
---
 drivers/acpi/tables.c | 2 +-
 include/acpi/actbl2.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 180ac4329763..0e905c3d1645 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -501,7 +501,7 @@ static const char * const table_sigs[] = {
 	ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
 	ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
 	ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
-	NULL };
+	ACPI_SIG_NHLT, NULL };
 
 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 
diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index e45ced27f4c3..876ccf50ec36 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -43,6 +43,7 @@
 #define ACPI_SIG_SBST           "SBST"	/* Smart Battery Specification Table */
 #define ACPI_SIG_SDEI           "SDEI"	/* Software Delegated Exception Interface Table */
 #define ACPI_SIG_SDEV           "SDEV"	/* Secure Devices table */
+#define ACPI_SIG_NHLT           "NHLT"	/* Non-HDAudio Link Table */
 
 /*
  * All tables must be byte-packed to match the ACPI specification, since
-- 
2.17.1