gpu: nvgpu: add cg and pg function

Add new power/clock gating functions that can be called by
other units.

New clock_gating functions will reside in cg.c under
common/power_features/cg unit.

New power gating functions will reside in pg.c under
common/power_features/pg unit.

Use nvgpu_pg_elpg_disable and nvgpu_pg_elpg_enable to disable/enable
elpg and also in gr_gk20a_elpg_protected macro to access gr registers.

Add cg_pg_lock to make elpg_enabled, elcg_enabled, blcg_enabled
and slcg_enabled thread safe.

JIRA NVGPU-2014

Change-Id: I00d124c2ee16242c9a3ef82e7620fbb7f1297aff
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2025493
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
(cherry-picked from c90585856567a547173a8b207365b3a4a3ccdd57 in
dev-kernel)
Reviewed-on: https://git-master.nvidia.com/r/2108406
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/driver_common.c b/drivers/gpu/nvgpu/os/linux/driver_common.c
index cf7877e2..ea4dadac 100644
--- a/drivers/gpu/nvgpu/os/linux/driver_common.c
+++ b/drivers/gpu/nvgpu/os/linux/driver_common.c
@@ -65,6 +65,7 @@ static void nvgpu_init_vars(struct gk20a *g)
         nvgpu_mutex_init(&g->ctxsw_disable_lock);
         nvgpu_mutex_init(&g->tpc_pg_lock);
         nvgpu_mutex_init(&g->clk_arb_enable_lock);
+        nvgpu_mutex_init(&g->cg_pg_lock);
 
         /* Init the clock req count to 0 */
         nvgpu_atomic_set(&g->clk_arb_global_nr, 0);