gpu: nvgpu: ZBC update without idle

Do ZBC updates without forcing engine idle first.

Bug 1698013

Change-Id: I99218c8cfd02be05dace2003b8d91921765f7ca9
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/829145

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index e43e58a0..3542a597 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -782,6 +782,14 @@ static inline u32 gk20a_readl(struct gk20a *g, u32 r)
         gk20a_dbg(gpu_dbg_reg, " r=0x%x v=0x%x", r, v);
         return v;
 }
+static inline void gk20a_writel_check(struct gk20a *g, u32 r, u32 v)
+{
+        gk20a_dbg(gpu_dbg_reg, " r=0x%x v=0x%x", r, v);
+        wmb();
+        do {
+                writel_relaxed(v, g->regs + r);
+        } while (readl(g->regs + r) != v);
+}
 
 static inline void gk20a_bar1_writel(struct gk20a *g, u32 b, u32 v)
 {