gpu: nvgpu: Initialize ELPG ref-count early.

gk20a_pmu_disable_elpg can be called before the PMU driver has
received and processed the INIT message from the PMU. If change
ensures that the ELPG ref-count has been initialized to zero
before that can happen.

Bug 200016313

Change-Id: Ic80ec1ee69b1eb0499effb1abf556f78cb041f5e
Signed-off-by: Neil Gabriel <ngabriel@nvidia.com>
Reviewed-on: http://git-master/r/429161
Reviewed-on: http://git-master/r/433299
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Robert Shih <rshih@nvidia.com>
Tested-by: Robert Shih <rshih@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c b/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c
index f77ad10b..9d52c943 100644
--- a/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c
@@ -1915,6 +1915,9 @@ int gk20a_init_pmu_setup_sw(struct gk20a *g)
 
         gk20a_dbg_fn("");
 
+        /* start with elpg disabled until first enable call */
+        pmu->elpg_refcnt = 0;
+
         if (pmu->sw_ready) {
                 for (i = 0; i < pmu->mutex_cnt; i++) {
                         pmu->mutex[i].id    = i;
@@ -2478,9 +2481,6 @@ static int pmu_init_powergating(struct pmu_gk20a *pmu)
         gk20a_pmu_cmd_post(g, &cmd, NULL, NULL, PMU_COMMAND_QUEUE_HPQ,
                         pmu_handle_pg_elpg_msg, pmu, &seq, ~0);
 
-        /* start with elpg disabled until first enable call */
-        pmu->elpg_refcnt = 0;
-
         pmu->pmu_state = PMU_STATE_ELPG_BOOTING;
 
         return 0;