1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/fb/fb_gv100.c b/drivers/gpu/nvgpu/common/fb/fb_gv100.c
index d092ff4a..ce51a2c6 100644
--- a/drivers/gpu/nvgpu/common/fb/fb_gv100.c
+++ b/drivers/gpu/nvgpu/common/fb/fb_gv100.c
@@ -192,6 +192,11 @@ int gv100_fb_memory_unlock(struct gk20a *g)
                 mem_unlock_ucode_header[OS_DATA_OFFSET] >> 2],
                 mem_unlock_ucode_header[OS_DATA_SIZE], 0);
 
+        /* Write non-zero value to mailbox register which is updated by
+         * mem_unlock bin to denote its return status.
+         */
+        nvgpu_flcn_mailbox_write(&g->nvdec_flcn, 0, 0xdeadbeef);
+
         /* set BOOTVEC to start of non-secure code */
         nvgpu_flcn_bootstrap(&g->nvdec_flcn, 0);
 
@@ -202,6 +207,7 @@ int gv100_fb_memory_unlock(struct gk20a *g)
         val = nvgpu_flcn_mailbox_read(&g->nvdec_flcn, 0);
         if (val) {
                 nvgpu_err(g, "memory unlock failed, err %x", val);
+                nvgpu_flcn_dump_stats(&g->nvdec_flcn);
                 err = -1;
                 goto exit;
         }