Deepak Nibade 1cf6539990 gpu: nvgpu: rework secure_page allocation path ...

Currently, if can_railgate = false, then we have below
sequence to allocate secure_page
- unrailgate GPU (forever)
- reset_assert()
- allocate secure_page
- reset_deassert()

But if we allocate secure page even before unrailgating GPU
for first time, then we can avoid reset_assert()/deassert()
calls since GPU should already be in reset/railgated at
boot time

hence, rework this sequence as below
- init required mutex, set platform->reset_control
- allocate secure page (GPU should already be in reset
  at this point)
- gk20a_pm_init() which unrailgates GPU in case of
  can_railgate = false

Bug 200137963
Bug 1678611

Change-Id: I79d0543bb5cf1eaf1009e1e6ac142532d84514a5
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/797153
(cherry picked from commit 368004501943d38c003747f6bec0384fed57ee65)
Reviewed-on: http://git-master/r/816005
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

2015-10-12 08:58:35 -07:00

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