gpu: nvgpu: When powering down, abort if not idle

When trying to power down GPU the engine might be still busy. In this
case delay power down by returning -EBUSY from
gk20a_pm_runtime_suspend().

Bug 200224907

Change-Id: Ibad74c090add24a185bc1a7a02df367af9b95ced
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/1213042
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/gk20a/fifo_gk20a.h b/drivers/gpu/nvgpu/gk20a/fifo_gk20a.h
index 17c6dbf6..71a9d35d 100644
--- a/drivers/gpu/nvgpu/gk20a/fifo_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/fifo_gk20a.h
@@ -206,6 +206,7 @@ void gk20a_init_fifo(struct gpu_ops *gops);
 void fifo_gk20a_finish_mmu_fault_handling(struct gk20a *g,
                 unsigned long fault_id);
 int gk20a_fifo_wait_engine_idle(struct gk20a *g);
+bool gk20a_fifo_is_engine_busy(struct gk20a *g);
 u32 gk20a_fifo_engine_interrupt_mask(struct gk20a *g);
 u32 gk20a_fifo_get_pbdma_signature(struct gk20a *g);
 u32 gk20a_fifo_get_failing_engine_data(struct gk20a *g,