drm/nouveau/ltc/tu102-: prepare for GSP-RM

- disable LTC completely when GSP-RM detected

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230918202149.4343-16-skeggsb@gmail.com

Author: Ben Skeggs

drivers/gpu/drm/nouveau/nvkm/subdev/ltc/ga102.c

@@ -21,6 +21,8 @@
  */
 #include "priv.h"
 
+#include <subdev/gsp.h>
+
 static void
 ga102_ltc_zbc_clear_color(struct nvkm_ltc *ltc, int i, const u32 color[4])
 {
@@ -53,5 +55,8 @@ int
 ga102_ltc_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
 	      struct nvkm_ltc **pltc)
 {
+	if (nvkm_gsp_rm(device->gsp))
+		return -ENODEV;
+
 	return nvkm_ltc_new_(&ga102_ltc, device, type, inst, pltc);
 }

drivers/gpu/drm/nouveau/nvkm/subdev/ltc/gp102.c

@@ -21,6 +21,8 @@
  */
 #include "priv.h"
 
+#include <subdev/gsp.h>
+
 void
 gp102_ltc_zbc_clear_stencil(struct nvkm_ltc *ltc, int i, const u32 stencil)
 {
@@ -49,5 +51,8 @@ int
 gp102_ltc_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
 	      struct nvkm_ltc **pltc)
 {
+	if (nvkm_gsp_rm(device->gsp))
+		return -ENODEV;
+
 	return nvkm_ltc_new_(&gp102_ltc, device, type, inst, pltc);
 }