drm/nouveau/nvdec: select implementation based on available fw

This will allow for further customisation of the subdev depending on what
firmware is available.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/engine/nvdec.h

@@ -5,6 +5,7 @@
 #include <core/engine.h>
 
 struct nvkm_nvdec {
+	const struct nvkm_nvdec_func *func;
 	struct nvkm_engine engine;
 	u32 addr;
 

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

@@ -21,6 +21,7 @@
  */
 #include "priv.h"
 
+#include <core/firmware.h>
 #include <subdev/top.h>
 #include <engine/falcon.h>
 
@@ -54,14 +55,24 @@ nvkm_nvdec = {
 };
 
 int
-nvkm_nvdec_new_(struct nvkm_device *device, int index,
-		struct nvkm_nvdec **pnvdec)
+nvkm_nvdec_new_(const struct nvkm_nvdec_fwif *fwif, struct nvkm_device *device,
+		int index, struct nvkm_nvdec **pnvdec)
 {
 	struct nvkm_nvdec *nvdec;
+	int ret;
 
 	if (!(nvdec = *pnvdec = kzalloc(sizeof(*nvdec), GFP_KERNEL)))
 		return -ENOMEM;
 
-	return nvkm_engine_ctor(&nvkm_nvdec, device, index, true,
+	ret = nvkm_engine_ctor(&nvkm_nvdec, device, index, true,
 			       &nvdec->engine);
+	if (ret)
+		return ret;
+
+	fwif = nvkm_firmware_load(&nvdec->engine.subdev, fwif, "Nvdec", nvdec);
+	if (IS_ERR(fwif))
+		return -ENODEV;
+
+	nvdec->func = fwif->func;
+	return 0;
 };

drivers/gpu/drm/nouveau/nvkm/engine/nvdec/gp102.c

@@ -19,12 +19,28 @@
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */
-
 #include "priv.h"
 
+static const struct nvkm_nvdec_func
+gp102_nvdec = {
+};
+
+static int
+gp102_nvdec_nofw(struct nvkm_nvdec *nvdec, int ver,
+		 const struct nvkm_nvdec_fwif *fwif)
+{
+	return 0;
+}
+
+static const struct nvkm_nvdec_fwif
+gp102_nvdec_fwif[] = {
+	{ -1, gp102_nvdec_nofw, &gp102_nvdec },
+	{}
+};
+
 int
 gp102_nvdec_new(struct nvkm_device *device, int index,
 		struct nvkm_nvdec **pnvdec)
 {
-	return nvkm_nvdec_new_(device, index, pnvdec);
+	return nvkm_nvdec_new_(gp102_nvdec_fwif, device, index, pnvdec);
 }

drivers/gpu/drm/nouveau/nvkm/engine/nvdec/priv.h

@@ -3,5 +3,16 @@
 #define __NVKM_NVDEC_PRIV_H__
 #include <engine/nvdec.h>
 
-int nvkm_nvdec_new_(struct nvkm_device *, int, struct nvkm_nvdec **);
+struct nvkm_nvdec_func {
+};
+
+struct nvkm_nvdec_fwif {
+	int version;
+	int (*load)(struct nvkm_nvdec *, int ver,
+		    const struct nvkm_nvdec_fwif *);
+	const struct nvkm_nvdec_func *func;
+};
+
+int nvkm_nvdec_new_(const struct nvkm_nvdec_fwif *fwif,
+		    struct nvkm_device *, int, struct nvkm_nvdec **);
 #endif