gpu: nvgpu: nvgpu_pmu_disable_elpg() status check

- Added status check for nvgpu_pmu_disable_elpg() return value
 & prints error information upon failure.
- Below CID's are due to missing status check of function
 nvgpu_pmu_disable_elpg() return value, so this CL helps to fix it
 2624546
 2624547
 2624548

Bug 200291879

Change-Id: I263fc6bc9e2667af478bfd7160fe205167556f99
Signed-off-by: Mahantesh Kumbar <mkumbar@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1565998
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c b/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c
index ed8e98b9..7fc773f8 100644
--- a/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c
@@ -1209,8 +1209,10 @@ void gk20a_fifo_reset_engine(struct gk20a *g, u32 engine_id)
                 nvgpu_err(g, "unsupported engine_id %d", engine_id);
 
         if (engine_enum == ENGINE_GR_GK20A) {
-                if (g->support_pmu && g->can_elpg)
-                        nvgpu_pmu_disable_elpg(g);
+                if (g->support_pmu && g->can_elpg) {
+                        if (nvgpu_pmu_disable_elpg(g))
+                                nvgpu_err(g, "failed to set disable elpg");
+                }
                 /* resetting engine will alter read/write index.
                  * need to flush circular buffer before re-enabling FECS.
                  */
@@ -1457,8 +1459,10 @@ static bool gk20a_fifo_handle_mmu_fault(
         g->fifo.deferred_reset_pending = false;
 
         /* Disable power management */
-        if (g->support_pmu && g->can_elpg)
-                nvgpu_pmu_disable_elpg(g);
+        if (g->support_pmu && g->can_elpg) {
+                if (nvgpu_pmu_disable_elpg(g))
+                        nvgpu_err(g, "failed to set disable elpg");
+        }
         if (g->ops.clock_gating.slcg_gr_load_gating_prod)
                 g->ops.clock_gating.slcg_gr_load_gating_prod(g,
                                 false);