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gpu: nvgpu: check that GPU is powered before flush

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if GPU is not powered before L2 is flushed, then
L2 cache flush is a noop. Same behavior as
gk20a_mm_L2_Invalidate()

bug 1661228

Change-Id: I0f590628928a73b7277d1b16a5a79a86e0213648
Signed-off-by: Sam Payne <spayne@nvidia.com>
Reviewed-on: http://git-master/r/768068
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
(cherry picked from commit cb4d29d34d0736aa753afa323bfb216481cc8640)
Reviewed-on: http://git-master/r/771113
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Sam Payne
2015-07-08 15:26:37 -07:00
committed by Sachin Nikam
parent ae2f9da28e
commit 37869170e4
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/nvgpu/gk20a/mm_gk20a.c
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@@ -3225,6 +3225,12 @@ int gk20a_mm_fb_flush(struct gk20a *g)
gk20a_dbg_fn("");
gk20a_busy_noresume(g->dev);
if (!g->power_on) {
pm_runtime_put_noidle(&g->dev->dev);
return 0;
}
mutex_lock(&mm->l2_op_lock);
/* Make sure all previous writes are committed to the L2. There's no
@@ -3262,6 +3268,8 @@ int gk20a_mm_fb_flush(struct gk20a *g)
mutex_unlock(&mm->l2_op_lock);
pm_runtime_put_noidle(&g->dev->dev);
return ret;
}