drm/nouveau/core: increase maximum number of nvdec instances to 3

RTX2070 appears to have 3 copies of the engine.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/core/device.h

@@ -63,7 +63,8 @@ enum nvkm_devidx {
 
 	NVKM_ENGINE_NVDEC0,
 	NVKM_ENGINE_NVDEC1,
-	NVKM_ENGINE_NVDEC_LAST = NVKM_ENGINE_NVDEC1,
+	NVKM_ENGINE_NVDEC2,
+	NVKM_ENGINE_NVDEC_LAST = NVKM_ENGINE_NVDEC2,
 
 	NVKM_ENGINE_PM,
 	NVKM_ENGINE_SEC,
@@ -167,7 +168,7 @@ struct nvkm_device {
 	struct nvkm_engine *msppp;
 	struct nvkm_engine *msvld;
 	struct nvkm_engine *nvenc[3];
-	struct nvkm_nvdec *nvdec[2];
+	struct nvkm_nvdec *nvdec[3];
 	struct nvkm_pm *pm;
 	struct nvkm_engine *sec;
 	struct nvkm_sec2 *sec2;
@@ -239,7 +240,7 @@ struct nvkm_device_chip {
 	int (*msppp   )(struct nvkm_device *, int idx, struct nvkm_engine **);
 	int (*msvld   )(struct nvkm_device *, int idx, struct nvkm_engine **);
 	int (*nvenc[3])(struct nvkm_device *, int idx, struct nvkm_engine **);
-	int (*nvdec[2])(struct nvkm_device *, int idx, struct nvkm_nvdec **);
+	int (*nvdec[3])(struct nvkm_device *, int idx, struct nvkm_nvdec **);
 	int (*pm      )(struct nvkm_device *, int idx, struct nvkm_pm **);
 	int (*sec     )(struct nvkm_device *, int idx, struct nvkm_engine **);
 	int (*sec2    )(struct nvkm_device *, int idx, struct nvkm_sec2 **);

drivers/gpu/drm/nouveau/nvkm/core/subdev.c

@@ -81,6 +81,7 @@ nvkm_subdev_name[NVKM_SUBDEV_NR] = {
 	[NVKM_ENGINE_NVENC2  ] = "nvenc2",
 	[NVKM_ENGINE_NVDEC0  ] = "nvdec0",
 	[NVKM_ENGINE_NVDEC1  ] = "nvdec1",
+	[NVKM_ENGINE_NVDEC2  ] = "nvdec2",
 	[NVKM_ENGINE_PM      ] = "pm",
 	[NVKM_ENGINE_SEC     ] = "sec",
 	[NVKM_ENGINE_SEC2    ] = "sec2",

drivers/gpu/drm/nouveau/nvkm/engine/device/base.c

@@ -2563,6 +2563,7 @@ nvkm_device_engine(struct nvkm_device *device, int index)
 	_(NVENC2 , device->nvenc[2],  device->nvenc[2]);
 	_(NVDEC0 , device->nvdec[0], &device->nvdec[0]->engine);
 	_(NVDEC1 , device->nvdec[1], &device->nvdec[1]->engine);
+	_(NVDEC2 , device->nvdec[2], &device->nvdec[2]->engine);
 	_(PM     , device->pm      , &device->pm->engine);
 	_(SEC    , device->sec     ,  device->sec);
 	_(SEC2   , device->sec2    , &device->sec2->engine);
@@ -3025,6 +3026,7 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
 		_(NVKM_ENGINE_NVENC2  , nvenc[2]);
 		_(NVKM_ENGINE_NVDEC0  , nvdec[0]);
 		_(NVKM_ENGINE_NVDEC1  , nvdec[1]);
+		_(NVKM_ENGINE_NVDEC2  , nvdec[2]);
 		_(NVKM_ENGINE_PM      ,       pm);
 		_(NVKM_ENGINE_SEC     ,      sec);
 		_(NVKM_ENGINE_SEC2    ,     sec2);