Debarshi Dutta cb70e86ac1 gpu: nvgpu: Allow SC7 suspend/resume ...

Allow SC7 suspend/resume for platforms even if runtime pm
is disabled.

Currently, nvgpu can disable runtime pm by setting railgate_init
field to false for platform_{gk20a/gv11b/ga10b) files. This is done by
taking extra reference count in the PM Framework.

However, device suspend would still fail. Fix this by checking
for NVGPU_CAN_RAILGATE and removing the additional reference count
taken as mentioned above. Take the extra refcount back at
the end of the resume path.

Bug 3458643

Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Change-Id: I413e09e2f9f380d78c0ce30196591e9c5b7544f3
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2668567
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
GVS: Gerrit_Virtual_Submit

2022-03-09 21:04:59 -08:00

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