Arun Kannan 7f819a9ba7 gpu: nvgpu: gp10b: cache gpu clk rate ...

Cache the rate used in clk_set_rate().
Return that cached rate on clk_get_rate(), don't read from hardware.
This cached rate is used to avoid duplicate requests to clk_set_rate().

Motivation is to support multiple governors for gpu clk.
Reading clock from hardware is unreliable in multi-governor situation.
Relying on hardware clock value could mislead the kernel gpu governor
in its scaling calculations.

Bug 2051688

Change-Id: I116b0ef73c51121b57ef36d08b6c67f49fdbf656
Signed-off-by: Arun Kannan <akannan@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1662759
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2018-03-01 02:32:10 -08:00

..

nvgpu

gpu: nvgpu: gp10b: cache gpu clk rate

2018-03-01 02:32:10 -08:00