drm/amdgpu: init nbio v7_9 callbacks

switch to the new nbio generation for NBIO 7.9.0.
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Le Ma <Le.Ma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c

@@ -37,6 +37,7 @@
 #include "nbio_v6_1.h"
 #include "nbio_v7_0.h"
 #include "nbio_v7_4.h"
+#include "nbio_v7_9.h"
 #include "hdp_v4_0.h"
 #include "vega10_ih.h"
 #include "vega20_ih.h"
@@ -2264,6 +2265,10 @@ int amdgpu_discovery_set_ip_blocks(struct amdgpu_device *adev)
 		adev->nbio.funcs = &nbio_v7_4_funcs;
 		adev->nbio.hdp_flush_reg = &nbio_v7_4_hdp_flush_reg;
 		break;
+	case IP_VERSION(7, 9, 0):
+		adev->nbio.funcs = &nbio_v7_9_funcs;
+		adev->nbio.hdp_flush_reg = &nbio_v7_9_hdp_flush_reg;
+		break;
 	case IP_VERSION(7, 2, 0):
 	case IP_VERSION(7, 2, 1):
 	case IP_VERSION(7, 3, 0):