Sagar Kamble 4012a97640 gpu: nvgpu: enable runtime PM before secure_alloc init during probe ...

With genpd based runtime PM, the device railgating is managed by the PM
core and the nvgpu manages the clocks. To suspend/resume the device for
idling/unidling while initializing secure alloc, runtime PM is to be
enabled during probe.

nvgpu platform railgate handlers will be only managing the clocks.
During probe, the nvgpu driver poweroff/poweron are not to be
invoked as part of driver runtime suspend/resume hence probe
state is added.

After platform probe initializes the clock, explicit runtime resume of
the device is required to sanely suspend it during gk20a_do_idle.

Runtime PM configuration differs based on the NVGPU_CAN_RAILGATE
capability, hence the runtime PM is enabled ("truly") only for
the duration of nvgpu_probe and then the state is reverted at
the beginning of gk20a_pm_late_init.

Bug 200602747
JIRA NVGPU-5356

Change-Id: I1fbd03d3f49da07ccbee9714387e00ffc688864e
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2375939
GVS: Gerrit_Virtual_Submit
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

2020-12-15 14:13:48 -06:00

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