From b33020008b727d75827d670ca7a6c969769ca1a0 Mon Sep 17 00:00:00 2001 From: Arto Merilainen Date: Wed, 6 Aug 2014 09:30:11 +0300 Subject: gpu: nvgpu: Add sw shadow for load value Reading the load value may increase CPU power consumption temprorarily. In most cases we are ok with a value that was read a moment earlier. This patch introduces a software shadow for gpu load. The shadow is updated before starting scaling and all scaling code paths use the sw shadow. Change-Id: I53d2ccb8e7f83147f411a14d3104d890dd9af9a3 Signed-off-by: Arto Merilainen Reviewed-on: http://git-master/r/453347 Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: Terje Bergstrom --- drivers/gpu/nvgpu/gk20a/pmu_gk20a.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'drivers/gpu/nvgpu/gk20a/pmu_gk20a.c') diff --git a/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c b/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c index 7c441f53..06e7a4e6 100644 --- a/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c +++ b/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c @@ -3676,17 +3676,23 @@ int gk20a_pmu_destroy(struct gk20a *g) } int gk20a_pmu_load_norm(struct gk20a *g, u32 *load) +{ + *load = g->pmu.load_shadow; + return 0; +} + +int gk20a_pmu_load_update(struct gk20a *g) { struct pmu_gk20a *pmu = &g->pmu; u16 _load = 0; if (!pmu->perfmon_ready) { - *load = 0; + pmu->load_shadow = 0; return 0; } pmu_copy_from_dmem(pmu, pmu->sample_buffer, (u8 *)&_load, 2, 0); - *load = _load / 10; + pmu->load_shadow = _load / 10; return 0; } -- cgit v1.2.2