gpu: nvlink: change default link speed to 20G

Add support for 20G speed by updating initPLL command and
update the default link speed set during nvlink init to 20G.

Bug 200398181

Change-Id: I22cde32842d140b34481aaec2b1561ffbd44e2d8
Signed-off-by: Tejal Kudav <tkudav@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1678444
Reviewed-by: Thomas Fleury <tfleury@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/gv100/nvlink_gv100.c b/drivers/gpu/nvgpu/gv100/nvlink_gv100.c
index ba649382..d0dfebcf 100644
--- a/drivers/gpu/nvgpu/gv100/nvlink_gv100.c
+++ b/drivers/gpu/nvgpu/gv100/nvlink_gv100.c
@@ -690,9 +690,12 @@ static u32 gv100_nvlink_minion_init_uphy(struct gk20a *g, unsigned long mask,
         unsigned long link_enable;
 
         switch(g->nvlink.speed) {
-        case nvgpu_nvlink_speed_default:
+        case nvgpu_nvlink_speed_25G:
                 init_pll_cmd = minion_nvlink_dl_cmd_command_initpll_0_v();
                 break;
+        case nvgpu_nvlink_speed_20G:
+                init_pll_cmd = minion_nvlink_dl_cmd_command_initpll_1_v();
+                break;
         default:
                 nvgpu_err(g, "Unsupported UPHY speed");
                 return -EINVAL;
@@ -2644,8 +2647,7 @@ int gv100_nvlink_early_init(struct gk20a *g)
                 goto nvlink_init_exit;
         }
 
-        /* For now set default speed */
-        g->nvlink.speed = nvgpu_nvlink_speed_default;
+        g->nvlink.speed = nvgpu_nvlink_speed_20G;
 
         err = __gv100_nvlink_state_load_hal(g);
         if (err) {