gpu: nvgpu: memory unlock HAL support

- Created "mem_unlock" HAL under fb to support memory
  unlock
- Called as part of gk20a_finalize_poweron() if memory unlock
  support needed by checking HAL
- Assigned "mem_unlock" HAL to NULL for chips which don't
  need memory unlocks.

Change-Id: I68d0910f15d293feaacfcbf6bd17ecccd3b5219d
Signed-off-by: Mahantesh Kumbar <mkumbar@nvidia.com>
(cherry picked from commit 586894eb84860bbbe4c75dae4715bdf27432a480)
Reviewed-on: https://git-master.nvidia.com/r/1564703
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gm20b/hal_gm20b.c b/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
index e146d3ca..269fd7f1 100644
--- a/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
@@ -308,6 +308,7 @@ static const struct gpu_ops gm20b_ops = {
                 .is_debug_mode_enabled = gm20b_fb_debug_mode_enabled,
                 .set_debug_mode = gm20b_fb_set_debug_mode,
                 .tlb_invalidate = gk20a_fb_tlb_invalidate,
+                .mem_unlock = NULL,
         },
         .clock_gating = {
                 .slcg_bus_load_gating_prod =