gpu: nvgpu: disable fb fault buffer in prepare poweroff

FB fault buffer is enabled on finalize poweron. Disable the buffer
in prepare poweroff. This also eliminates the need to disable
the buffer in fault info mem destroy which otherwise accesses
GPU registers after these are locked in prepare poweroff.

Bug 200427479

Change-Id: I1ca3e6ed4417847731c09b887134f215a2ba331c
Signed-off-by: Aparna Das <aparnad@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1776387
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/mm/mm.c b/drivers/gpu/nvgpu/common/mm/mm.c
index 2663ab43..42d708ee 100644
--- a/drivers/gpu/nvgpu/common/mm/mm.c
+++ b/drivers/gpu/nvgpu/common/mm/mm.c
@@ -117,6 +117,10 @@ int nvgpu_mm_suspend(struct gk20a *g)
                 g->ops.fb.disable_hub_intr(g);
         }
 
+        if (g->ops.mm.mmu_fault_disable_hw != NULL) {
+                g->ops.mm.mmu_fault_disable_hw(g);
+        }
+
         nvgpu_log_info(g, "MM suspend done!");
 
         return 0;