drm/nouveau/fb/gp100-: disable address remapper

This was causing problems on a system with a large amount of RAM, where
display push buffers were being fetched incorrectly when placed in high
system memory addresses.

While this commit will resolve the issue on that particular system, the
issue will be avoided completely with another patch to more fully solve
problems with display and large amounts of system memory on Pascal.

It's still probably a good idea to disable this to prevent weird issues
in the future.

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

4 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/base.c
index 73b5d46104bd..434d2fc5bb1c 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/base.c
@@ -140,6 +140,9 @@ nvkm_fb_init(struct nvkm_subdev *subdev)
         if (fb->func->init)
                 fb->func->init(fb);
 
+        if (fb->func->init_remapper)
+                fb->func->init_remapper(fb);
+
         if (fb->func->init_page) {
                 ret = fb->func->init_page(fb);
                 if (WARN_ON(ret))
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gp100.c b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gp100.c
index dffe1f5e1071..8205ce436b3e 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gp100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gp100.c
@@ -37,6 +37,14 @@ gp100_fb_init_unkn(struct nvkm_fb *base)
 }
 
 void
+gp100_fb_init_remapper(struct nvkm_fb *fb)
+{
+        struct nvkm_device *device = fb->subdev.device;
+        /* Disable address remapper. */
+        nvkm_mask(device, 0x100c14, 0x00040000, 0x00000000);
+}
+
+void
 gp100_fb_init(struct nvkm_fb *base)
 {
         struct gf100_fb *fb = gf100_fb(base);
@@ -56,6 +64,7 @@ gp100_fb = {
         .dtor = gf100_fb_dtor,
         .oneinit = gf100_fb_oneinit,
         .init = gp100_fb_init,
+        .init_remapper = gp100_fb_init_remapper,
         .init_page = gm200_fb_init_page,
         .init_unkn = gp100_fb_init_unkn,
         .ram_new = gp100_ram_new,
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gp102.c b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gp102.c
index b84b9861ef26..b4d74e815674 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gp102.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/gp102.c
@@ -31,6 +31,7 @@ gp102_fb = {
         .dtor = gf100_fb_dtor,
         .oneinit = gf100_fb_oneinit,
         .init = gp100_fb_init,
+        .init_remapper = gp100_fb_init_remapper,
         .init_page = gm200_fb_init_page,
         .ram_new = gp100_ram_new,
 };
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/priv.h b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/priv.h
index 2857f31466bf..1e4ad61c19e1 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/priv.h
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/priv.h
@@ -11,6 +11,7 @@ struct nvkm_fb_func {
         u32 (*tags)(struct nvkm_fb *);
         int (*oneinit)(struct nvkm_fb *);
         void (*init)(struct nvkm_fb *);
+        void (*init_remapper)(struct nvkm_fb *);
         int (*init_page)(struct nvkm_fb *);
         void (*init_unkn)(struct nvkm_fb *);
         void (*intr)(struct nvkm_fb *);
@@ -69,5 +70,6 @@ int gf100_fb_init_page(struct nvkm_fb *);
 
 int gm200_fb_init_page(struct nvkm_fb *);
 
+void gp100_fb_init_remapper(struct nvkm_fb *);
 void gp100_fb_init_unkn(struct nvkm_fb *);
 #endif