[Nouveau] [RFC PATCH] gr: did you try turning it off and on again.

[Karol Herbst]

Fixes secure boot on my gp107. No idea why. Otherwise the GPU enters
complete lockdown after starting the gpccs and fecs with the LS images
loaded.

Signed-off-by: Karol Herbst <kherbst at redhat.com>
---
 drm/nouveau/nvkm/engine/gr/gf100.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drm/nouveau/nvkm/engine/gr/gf100.c b/drm/nouveau/nvkm/engine/gr/gf100.c
index 2f8dc107..322d9fa6 100644
--- a/drm/nouveau/nvkm/engine/gr/gf100.c
+++ b/drm/nouveau/nvkm/engine/gr/gf100.c
@@ -1731,8 +1731,15 @@ gf100_gr_init_(struct nvkm_gr *base)
 {
 	struct gf100_gr *gr = gf100_gr(base);
 	struct nvkm_subdev *subdev = &base->engine.subdev;
+	struct nvkm_device *device = subdev->device;
 	u32 ret;
 
+	/* did you try turning it off and on again? Apparently we need this
+	 * on pascal, otherwise secboot will just fail.
+	 */
+	nvkm_mask(device, 0x200, 0x1000, 0x0000);
+	nvkm_mask(device, 0x200, 0x1000, 0x1000);
+
 	nvkm_pmu_pgob(gr->base.engine.subdev.device->pmu, false);
 
 	ret = nvkm_falcon_get(gr->fecs, subdev);
-- 
2.14.3