drm/nouveau/devinit: Convert function disable() to be void

The current design of callback function disable() of struct
nvkm_devinit_func is defined to return a u64 value. In its implementation
in the driver modules, the function always returns a fixed value 0. Hence
the design and implementation of this function should be enhanced to return
void instead of a fixed value. This change also eliminates untouched
return variables.

The change is identified using the returnvar.cocci Coccinelle semantic
patch script.
Signed-off-by: Deepak R Varma <drv@mailo.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/Y9FFoooIXjlr+UP1@ubun2204.myguest.virtualbox.org

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/base.c

@@ -51,7 +51,8 @@ u64
 nvkm_devinit_disable(struct nvkm_devinit *init)
 {
 	if (init && init->func->disable)
-		return init->func->disable(init);
+		init->func->disable(init);
+
 	return 0;
 }
 

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/g84.c

@@ -26,13 +26,12 @@
 #include <subdev/bios.h>
 #include <subdev/bios/init.h>
 
-static u64
+static void
 g84_devinit_disable(struct nvkm_devinit *init)
 {
 	struct nvkm_device *device = init->subdev.device;
 	u32 r001540 = nvkm_rd32(device, 0x001540);
 	u32 r00154c = nvkm_rd32(device, 0x00154c);
-	u64 disable = 0ULL;
 
 	if (!(r001540 & 0x40000000)) {
 		nvkm_subdev_disable(device, NVKM_ENGINE_MPEG, 0);
@@ -47,8 +46,6 @@ g84_devinit_disable(struct nvkm_devinit *init)
 		nvkm_subdev_disable(device, NVKM_ENGINE_BSP, 0);
 	if (!(r00154c & 0x00000040))
 		nvkm_subdev_disable(device, NVKM_ENGINE_CIPHER, 0);
-
-	return disable;
 }
 
 static const struct nvkm_devinit_func

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/g98.c

@@ -26,7 +26,7 @@
 #include <subdev/bios.h>
 #include <subdev/bios/init.h>
 
-static u64
+static void
 g98_devinit_disable(struct nvkm_devinit *init)
 {
 	struct nvkm_device *device = init->subdev.device;
@@ -45,8 +45,6 @@ g98_devinit_disable(struct nvkm_devinit *init)
 		nvkm_subdev_disable(device, NVKM_ENGINE_MSVLD, 0);
 	if (!(r00154c & 0x00000040))
 		nvkm_subdev_disable(device, NVKM_ENGINE_SEC, 0);
-
-	return 0ULL;
 }
 
 static const struct nvkm_devinit_func

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c

@@ -63,7 +63,7 @@ gf100_devinit_pll_set(struct nvkm_devinit *init, u32 type, u32 freq)
 	return ret;
 }
 
-static u64
+static void
 gf100_devinit_disable(struct nvkm_devinit *init)
 {
 	struct nvkm_device *device = init->subdev.device;
@@ -85,8 +85,6 @@ gf100_devinit_disable(struct nvkm_devinit *init)
 		nvkm_subdev_disable(device, NVKM_ENGINE_CE, 0);
 	if (r022500 & 0x00000200)
 		nvkm_subdev_disable(device, NVKM_ENGINE_CE, 1);
-
-	return 0ULL;
 }
 
 void

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gm107.c

@@ -26,7 +26,7 @@
 #include <subdev/bios.h>
 #include <subdev/bios/init.h>
 
-u64
+void
 gm107_devinit_disable(struct nvkm_devinit *init)
 {
 	struct nvkm_device *device = init->subdev.device;
@@ -39,8 +39,6 @@ gm107_devinit_disable(struct nvkm_devinit *init)
 		nvkm_subdev_disable(device, NVKM_ENGINE_CE, 2);
 	if (r021c04 & 0x00000001)
 		nvkm_subdev_disable(device, NVKM_ENGINE_DISP, 0);
-
-	return 0ULL;
 }
 
 static const struct nvkm_devinit_func

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gt215.c

@@ -62,7 +62,7 @@ gt215_devinit_pll_set(struct nvkm_devinit *init, u32 type, u32 freq)
 	return ret;
 }
 
-static u64
+static void
 gt215_devinit_disable(struct nvkm_devinit *init)
 {
 	struct nvkm_device *device = init->subdev.device;
@@ -80,8 +80,6 @@ gt215_devinit_disable(struct nvkm_devinit *init)
 		nvkm_subdev_disable(device, NVKM_ENGINE_MSVLD, 0);
 	if (!(r00154c & 0x00000200))
 		nvkm_subdev_disable(device, NVKM_ENGINE_CE, 0);
-
-	return 0ULL;
 }
 
 static u32

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/mcp89.c

@@ -26,7 +26,7 @@
 #include <subdev/bios.h>
 #include <subdev/bios/init.h>
 
-static u64
+static void
 mcp89_devinit_disable(struct nvkm_devinit *init)
 {
 	struct nvkm_device *device = init->subdev.device;
@@ -46,8 +46,6 @@ mcp89_devinit_disable(struct nvkm_devinit *init)
 		nvkm_subdev_disable(device, NVKM_ENGINE_VIC, 0);
 	if (!(r00154c & 0x00000200))
 		nvkm_subdev_disable(device, NVKM_ENGINE_CE, 0);
-
-	return 0;
 }
 
 static const struct nvkm_devinit_func

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/nv50.c

@@ -77,17 +77,14 @@ nv50_devinit_pll_set(struct nvkm_devinit *init, u32 type, u32 freq)
 	return 0;
 }
 
-static u64
+static void
 nv50_devinit_disable(struct nvkm_devinit *init)
 {
 	struct nvkm_device *device = init->subdev.device;
 	u32 r001540 = nvkm_rd32(device, 0x001540);
-	u64 disable = 0ULL;
 
 	if (!(r001540 & 0x40000000))
 		nvkm_subdev_disable(device, NVKM_ENGINE_MPEG, 0);
-
-	return disable;
 }
 
 void

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/nv50.h

@@ -23,7 +23,7 @@ int  gf100_devinit_ctor(struct nvkm_object *, struct nvkm_object *,
 int  gf100_devinit_pll_set(struct nvkm_devinit *, u32, u32);
 void gf100_devinit_preinit(struct nvkm_devinit *);
 
-u64  gm107_devinit_disable(struct nvkm_devinit *);
+void  gm107_devinit_disable(struct nvkm_devinit *);
 
 int gm200_devinit_post(struct nvkm_devinit *, bool);
 void gm200_devinit_preos(struct nv50_devinit *, bool);

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/priv.h

@@ -12,7 +12,7 @@ struct nvkm_devinit_func {
 	u32  (*mmio)(struct nvkm_devinit *, u32);
 	void (*meminit)(struct nvkm_devinit *);
 	int  (*pll_set)(struct nvkm_devinit *, u32 type, u32 freq);
-	u64  (*disable)(struct nvkm_devinit *);
+	void (*disable)(struct nvkm_devinit *);
 };
 
 void nvkm_devinit_ctor(const struct nvkm_devinit_func *, struct nvkm_device *,