gu: nvgpu: Add PMU state ELPG booting

Add PMU state ELPG booting. Prevent ISR processing when PMU is in OFF
state.

Bug 200006956

Change-Id: Ibcf69a2d81965cc87f520bf864c4425681f04531
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/424769

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c b/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c
index ac66dbef..cfbdceae 100644
--- a/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c
@@ -2017,6 +2017,8 @@ int gk20a_init_pmu_support(struct gk20a *g)
                 err = g->ops.pmu.pmu_setup_hw_and_bootstrap(g);
                 if (err)
                         return err;
+
+                pmu->pmu_state = PMU_STATE_STARTING;
         }
 
         return err;
@@ -2047,7 +2049,7 @@ static void pmu_handle_pg_elpg_msg(struct gk20a *g, struct pmu_msg *msg,
         case PMU_PG_ELPG_MSG_DISALLOW_ACK:
                 gk20a_dbg_pmu("DISALLOW is acknowledged from PMU");
                 pmu->elpg_stat = PMU_ELPG_STAT_OFF;
-                if (pmu->pmu_state == PMU_STATE_STARTING)
+                if (pmu->pmu_state == PMU_STATE_ELPG_BOOTING)
                         pmu->pmu_state = PMU_STATE_ELPG_BOOTED;
                 schedule_work(&pmu->pg_init);
                 break;
@@ -2147,7 +2149,7 @@ static int pmu_init_powergating(struct pmu_gk20a *pmu)
         /* start with elpg disabled until first enable call */
         pmu->elpg_refcnt = 0;
 
-        pmu->pmu_state = PMU_STATE_STARTING;
+        pmu->pmu_state = PMU_STATE_ELPG_BOOTING;
 
         return 0;
 }
@@ -2891,7 +2893,8 @@ void gk20a_pmu_isr(struct gk20a *g)
 
         gk20a_dbg_pmu("received falcon interrupt: 0x%08x", intr);
 
-        if (!intr) {
+        if (!intr || pmu->pmu_state == PMU_STATE_OFF) {
+                gk20a_writel(g, pwr_falcon_irqsclr_r(), intr);
                 mutex_unlock(&pmu->isr_mutex);
                 return;
         }