gpu: nvgpu: Do not call ELPG if disabled

Do not call PMU ELPG calls if ELPG should be disabled. Also skips
initialization of PMU ucode if PMU is disabled.

Bug 1567274

Change-Id: Ia9cd3b553c358142ee05a1b0e0832f9412f7cf17
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/593335
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>

2 files changed, 6 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c b/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c
index 4095b079..df6b84c5 100644
--- a/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/fifo_gk20a.c
@@ -900,7 +900,8 @@ void fifo_gk20a_finish_mmu_fault_handling(struct gk20a *g,
                      gr_gpfifo_ctl_semaphore_access_enabled_f());
 
         /* It is safe to enable ELPG again. */
-        gk20a_pmu_enable_elpg(g);
+        if (support_gk20a_pmu(g->dev) && g->elpg_enabled)
+                gk20a_pmu_enable_elpg(g);
 }
 
 static bool gk20a_fifo_set_ctx_mmu_error(struct gk20a *g,
@@ -974,7 +975,8 @@ static bool gk20a_fifo_handle_mmu_fault(struct gk20a *g)
         g->fifo.deferred_reset_pending = false;
 
         /* Disable power management */
-        gk20a_pmu_disable_elpg(g);
+        if (support_gk20a_pmu(g->dev) && g->elpg_enabled)
+                gk20a_pmu_disable_elpg(g);
         g->ops.clock_gating.slcg_gr_load_gating_prod(g,
                         false);
         g->ops.clock_gating.slcg_perf_load_gating_prod(g,
diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index 276e5c3e..58108d97 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -820,7 +820,8 @@ static int gk20a_pm_finalize_poweron(struct device *dev)
                 goto done;
         }
 
-        err = g->ops.pmu.prepare_ucode(g);
+        if (g->ops.pmu.prepare_ucode)
+                err = g->ops.pmu.prepare_ucode(g);
         if (err) {
                 gk20a_err(dev, "failed to init pmu ucode");
                 goto done;