drm/nouveau/bios: fix thinko in ZM_MASK_ADD opcode

Cc: stable@vger.kernel.org
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/init.c b/drivers/gpu/drm/nouveau/core/subdev/bios/init.c
index c300b5e7b670..c434d398d16f 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/bios/init.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bios/init.c
@@ -1940,8 +1940,8 @@ init_zm_mask_add(struct nvbios_init *init)
         trace("ZM_MASK_ADD\tR[0x%06x] &= 0x%08x += 0x%08x\n", addr, mask, add);
         init->offset += 13;
 
-        data  =  init_rd32(init, addr) & mask;
-        data |= ((data + add) & ~mask);
+        data =  init_rd32(init, addr);
+        data = (data & mask) | ((data + add) & ~mask);
         init_wr32(init, addr, data);
 }