Nitin Kumbhar 237af3ef86 gpu: nvgpu: add interface to power on-off gpu ...

The power rail of dGPU is managed with help of a set of
GPIOs. Using those GPIOs add an interface to power off and
power on dGPU.

Before dGPU is powered off, new work is blocked by setting
NVGPU_DRIVER_IS_DYING and current jobs are allowed to finish
by waiting for gpu to be idle.

The tegra PCIe controller driver provided APIs
tegra_pcie_attach_controller() and tegra_pcie_detach_controller()
are used to manage PCIe link shutdown, PCIe refclk management
and PCIe rescan.

JIRA NVGPU-1100

Change-Id: Ifae5b81535f40dceca5292a987d3daf6984f3210
Signed-off-by: Nitin Kumbhar <nkumbhar@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1749847
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2018-10-12 17:35:10 +05:30

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