gpu: nvgpu: Remove gk20a_scale_notify_busy/idle() hooks

Remove dependency for nvgpu to invoke devfreq govenor on every
gk20a_busy/idle() call. This dependency was originally necessary to
track GPU load (busy vs idle) in software. However, since we currently
read the load GPU from HW/PMU there is no need to invoke the devfreq
governor in this path. Instead it can use timer-based polling.

Jira NVGPU-20

Change-Id: Id09f89a8a562ed49164a2e06dcbb901e4a46e7d5
Signed-off-by: Peter Boonstoppel <pboonstoppel@nvidia.com>
Reviewed-on: https://git-master/r/1473140
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

2 files changed, 0 insertions, 45 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/module.c b/drivers/gpu/nvgpu/common/linux/module.c
index 99bbc25e..c6794e44 100644
--- a/drivers/gpu/nvgpu/common/linux/module.c
+++ b/drivers/gpu/nvgpu/common/linux/module.c
@@ -96,8 +96,6 @@ int gk20a_busy(struct gk20a *g)
                 }
         }
 
-        gk20a_scale_notify_busy(dev);
-
 fail:
         up_read(&g->busy_lock);
 
@@ -121,16 +119,8 @@ void gk20a_idle(struct gk20a *g)
                 return;
 
         if (pm_runtime_enabled(dev)) {
-#ifdef CONFIG_PM
-                if (atomic_read(&g->dev->power.usage_count) == 1)
-                        gk20a_scale_notify_idle(dev);
-#endif
-
                 pm_runtime_mark_last_busy(dev);
                 pm_runtime_put_sync_autosuspend(dev);
-
-        } else {
-                gk20a_scale_notify_idle(dev);
         }
 }
 
diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_scale.c b/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
index df4e4996..636bfad4 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
@@ -268,41 +268,6 @@ void gk20a_scale_resume(struct device *dev)
 }
 
 /*
- * gk20a_scale_notify(dev, busy)
- *
- * Calling this function informs that the device is idling (..or busy). This
- * data is used to estimate the current load
- */
-
-static void gk20a_scale_notify(struct device *dev, bool busy)
-{
-        struct gk20a *g = get_gk20a(dev);
-        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
-        struct gk20a_scale_profile *profile = g->scale_profile;
-        struct devfreq *devfreq = l->devfreq;
-
-        /* Is the device profile initialised? */
-        if (!(profile && devfreq))
-                return;
-
-        mutex_lock(&devfreq->lock);
-        profile->dev_stat.busy = busy;
-        update_devfreq(devfreq);
-        mutex_unlock(&devfreq->lock);
-}
-
-void gk20a_scale_notify_idle(struct device *dev)
-{
-        gk20a_scale_notify(dev, false);
-
-}
-
-void gk20a_scale_notify_busy(struct device *dev)
-{
-        gk20a_scale_notify(dev, true);
-}
-
-/*
  * gk20a_scale_get_dev_status(dev, *stat)
  *
  * This function queries the current device status.