gpu: nvgpu: unrailgate only if pm_domains not enabled

Currently we unrailgate the GPU if railgating is not enabled
or pm_domains are not enabled

But in case if railgating is not enabled and pm_domains
are enabled, we explicitly unrailgate GPU in gk20a_pm_init()
and then runtime PM unrailgates it again when first user
space request arrives - setting unrailgate refcount to 2

Now for gk20a_do_idle(), we need to railgate the GPU in
fist call but that does not happen since unrailgate
refcount != 1

hence, in case railgating is not enabled, we should
unrailgate the GPU from only one place i.e. when first user
space request arrives

Bug 200142989
Bug 200137963
Bug 1678611

Reviewed-on: http://git-master/r/820321
(cherry picked from commit 452a1ff8da8e3f47caed2371440f9ad150bf8699)

Change-Id: Ic9fe2267c9df5629315c30c1404c2b3044c1265a
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/822296
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sachin Nikam <snikam@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index fd7fdee1..a44ce996 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -1290,7 +1290,7 @@ static int gk20a_pm_init(struct platform_device *dev)
          * turn on the rail now. */
         if (platform->can_railgate && IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
                 _gk20a_pm_railgate(dev);
-        else
+        else if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
                 _gk20a_pm_unrailgate(dev);
 
         /* genpd will take care of runtime power management if it is enabled */