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, 0 insertions, 6 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index b4c132ce..085caec5 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -2789,16 +2789,10 @@ int gk20a_channel_suspend(struct gk20a *g)
         struct fifo_gk20a *f = &g->fifo;
         u32 chid;
         bool channels_in_use = false;
-        int err;
         u32 active_runlist_ids = 0;
 
         gk20a_dbg_fn("");
 
-        /* wait for engine idle */
-        err = g->ops.fifo.wait_engine_idle(g);
-        if (err)
-                return err;
-
         for (chid = 0; chid < f->num_channels; chid++) {
                 struct channel_gk20a *ch = &f->channel[chid];
                 if (gk20a_channel_get(ch)) {