drm/nouveau/fifo/gk104: add nvdec plumbing

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvif/cla06f.h

@@ -11,6 +11,7 @@ struct kepler_channel_gpfifo_a_v0 {
 #define NVA06F_V0_ENGINE_MSPDEC                                      0x00000020
 #define NVA06F_V0_ENGINE_MSPPP                                       0x00000040
 #define NVA06F_V0_ENGINE_MSENC                                       0x00000080
+#define NVA06F_V0_ENGINE_NVDEC                                       0x00000200
 #define NVA06F_V0_ENGINE_NVENC0                                      0x00000400
 #define NVA06F_V0_ENGINE_NVENC1                                      0x00000800
 #define NVA06F_V0_ENGINE_CE0                                         0x00010000

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c

@@ -737,6 +737,7 @@ gk104_fifo_oneinit(struct nvkm_fifo *base)
 		case 0x0000000d: engidx = NVKM_ENGINE_SEC; break;
 		case 0x0000000e: engidx = NVKM_ENGINE_NVENC0; break;
 		case 0x0000000f: engidx = NVKM_ENGINE_NVENC1; break;
+		case 0x00000010: engidx = NVKM_ENGINE_NVDEC; break;
 			break;
 		default:
 			break;

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogk104.c

@@ -67,6 +67,7 @@ gk104_fifo_gpfifo_engine_addr(struct nvkm_engine *engine)
 	case NVKM_ENGINE_MSPPP : return 0x0260;
 	case NVKM_ENGINE_MSVLD : return 0x0270;
 	case NVKM_ENGINE_MSENC : return 0x0290;
+	case NVKM_ENGINE_NVDEC : return 0x02100270;
 	case NVKM_ENGINE_NVENC0: return 0x02100290;
 	case NVKM_ENGINE_NVENC1: return 0x0210;
 	default:
@@ -343,6 +344,7 @@ gk104_fifo_gpfifo[] = {
 	{ NVA06F_V0_ENGINE_MSPDEC, BIT_ULL(NVKM_ENGINE_MSPDEC) },
 	{ NVA06F_V0_ENGINE_MSPPP , BIT_ULL(NVKM_ENGINE_MSPPP ) },
 	{ NVA06F_V0_ENGINE_MSENC , BIT_ULL(NVKM_ENGINE_MSENC ) },
+	{ NVA06F_V0_ENGINE_NVDEC , BIT_ULL(NVKM_ENGINE_NVDEC ) },
 	{ NVA06F_V0_ENGINE_NVENC0, BIT_ULL(NVKM_ENGINE_NVENC0) },
 	{ NVA06F_V0_ENGINE_NVENC1, BIT_ULL(NVKM_ENGINE_NVENC1) },
 	{ NVA06F_V0_ENGINE_CE0   , BIT_ULL(NVKM_ENGINE_CE0   ) },