gpu: nvgpu: check return value of mutex_init in pstate.c

- check return value of nvgpu_mutex_init in pstate.c
- add new callback gk20a_deinit_pstate_support() to
  deinitialize pstate support
- add corresponding nvgpu_mutex_destroy calls

Jira NVGPU-13

Change-Id: I206bf2324e8fe95f4ed52c29ac5d8981327632b2
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1321296
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/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index aae3072a..060429d1 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -459,6 +459,10 @@ static int gk20a_pm_prepare_poweroff(struct device *dev)
         if (g->ops.clk.suspend_clk_support)
                 ret |= g->ops.clk.suspend_clk_support(g);
 
+#ifdef CONFIG_ARCH_TEGRA_18x_SOC
+        if (g->ops.pmupstate)
+                gk20a_deinit_pstate_support(g);
+#endif
         g->power_on = false;
 
         /* Decrement platform power refcount */