gpu: nvgpu: Invalidate CBC in initialization

Ensure CBC is invalidated at GPU initialization.

Bug 1409151

Change-Id: I054be20a3252e40c96baec75958918c85a5a7801
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/ltc_common.c b/drivers/gpu/nvgpu/gk20a/ltc_common.c
index bc45ac41..8af8c687 100644
--- a/drivers/gpu/nvgpu/gk20a/ltc_common.c
+++ b/drivers/gpu/nvgpu/gk20a/ltc_common.c
@@ -182,6 +182,9 @@ static int gk20a_ltc_init_zbc(struct gk20a *g, struct gr_gk20a *gr)
 
 static void gk20a_ltc_init_cbc(struct gk20a *g, struct gr_gk20a *gr)
 {
+        u32 max_size = gr->max_comptag_mem;
+        u32 max_comptag_lines = max_size << 3;
+
         u32 compbit_base_post_divide;
         u64 compbit_base_post_multiply64;
         u64 compbit_store_base_iova =
@@ -206,6 +209,10 @@ static void gk20a_ltc_init_cbc(struct gk20a *g, struct gr_gk20a *gr)
                    (u32)(compbit_store_base_iova >> 32),
                    (u32)(compbit_store_base_iova & 0xffffffff),
                    compbit_base_post_divide);
+
+        g->ops.ltc.cbc_ctrl(g, gk20a_cbc_op_invalidate,
+                            0, max_comptag_lines - 1);
+
 }
 
 /* Flushes the compression bit cache as well as "data".