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, 8 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index d203a335..2d09c0bb 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -192,6 +192,14 @@ int gk20a_finalize_poweron(struct gk20a *g)
                 }
         }
 
+        if (g->ops.fb.mem_unlock) {
+                err = g->ops.fb.mem_unlock(g);
+                if (err) {
+                        nvgpu_err(g, "failed to unlock memory");
+                        goto done;
+                }
+        }
+
         err = g->ops.fifo.reset_enable_hw(g);
 
         if (err) {