gpu: nvgpu: Skip reg read of gpc2clk

Bug 200066741

As we are just getting out of reset and this reg is not
written before, so we dont stand the risk of loosing
any data

Change-Id: Ifc1bcaa3c224038e4e2a47882a4523f7633cb660
Signed-off-by: Supriya <ssharatkumar@nvidia.com>
Reviewed-on: http://git-master/r/715652
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/priv_ring_gk20a.c b/drivers/gpu/nvgpu/gk20a/priv_ring_gk20a.c
index 9d82a986..c893c681 100644
--- a/drivers/gpu/nvgpu/gk20a/priv_ring_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/priv_ring_gk20a.c
@@ -26,12 +26,14 @@
 
 void gk20a_reset_priv_ring(struct gk20a *g)
 {
-        u32 data;
+        u32 data = 0;
 
         if (tegra_platform_is_linsim())
                 return;
 
-        data = gk20a_readl(g, trim_sys_gpc2clk_out_r());
+        /* Skipping read and then writeback to this reg, as we are just getting
+        * out of reset, and before this call, the reg is not written to*/
+
         data = set_field(data,
                         trim_sys_gpc2clk_out_bypdiv_m(),
                         trim_sys_gpc2clk_out_bypdiv_f(0));