gpu: nvgpu: move pmu_load_update() to get_dev_status()

We currently call gk20a_pmu_load_update() before calling
update_devfreq()

But it is possible to disable governor and set a
constant/max frequency.
In that case we will unnecessarily keep executing
gk20a_pmu_load_update() for each submit

Hence. move gk20a_pmu_load_update() to gk20a_scale_get_dev_status()
so that we call gk20a_pmu_load_update() only when we really
have to scale the frequency

Bug 200161377

Change-Id: Ifac5a659a3a2d088b636f048213c2fbec801bdb9
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/929509
(cherry picked from commit f857a1b31400dfc0c35c58c6424aaac36bc09e7c)
Reviewed-on: http://git-master/r/933704
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 7 insertions, 8 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_scale.c b/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
index 82e24535..65772d3b 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
@@ -190,18 +190,10 @@ void gk20a_scale_resume(struct platform_device *pdev)
 
 static void gk20a_scale_notify(struct platform_device *pdev, bool busy)
 {
-        struct gk20a_platform *platform = platform_get_drvdata(pdev);
         struct gk20a *g = get_gk20a(pdev);
         struct gk20a_scale_profile *profile = g->scale_profile;
         struct devfreq *devfreq = g->devfreq;
 
-        /* update the software shadow */
-        gk20a_pmu_load_update(g);
-
-        /* inform edp about new constraint */
-        if (platform->prescale)
-                platform->prescale(pdev);
-
         /* Is the device profile initialised? */
         if (!(profile && devfreq))
                 return;
@@ -237,6 +229,13 @@ static int gk20a_scale_get_dev_status(struct device *dev,
         struct platform_device *pdev = to_platform_device(dev);
         struct gk20a_platform *platform = platform_get_drvdata(pdev);
 
+        /* update the software shadow */
+        gk20a_pmu_load_update(g);
+
+        /* inform edp about new constraint */
+        if (platform->prescale)
+                platform->prescale(pdev);
+
         /* Make sure there are correct values for the current frequency */
         profile->dev_stat.current_frequency =
                                 platform->clk_get_rate(profile->pdev);