gpu: nvgpu: add call back for get_cur_freq

When thermal throttling triggers gpcclk clock
changes, devfreq driver need to have call back
for get_cur_freq to get current gpu frequency.

With out this change, "17000000.gp10b/cur_freq"
interface won't show the current gpcclk frequency,
when thermal throttling triggers gpcclk frequency
changes.

Bug 1740309

Change-Id: I2484728094883abc285b2a3808bb2cef26a4ea96
Signed-off-by: sreenivasulu velpula <svelpula@nvidia.com>
Reviewed-on: http://git-master/r/1145912
(cherry picked from commit 0a6ef7b121d1b8aeba42cefa6e8b090b1ccd15e7)
Signed-off-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-on: http://git-master/r/1147652
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_scale.c b/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
index e5c93db5..6d60d899 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
@@ -252,6 +252,20 @@ static int gk20a_scale_get_dev_status(struct device *dev,
 }
 
 /*
+ * get_cur_freq(struct device *dev, unsigned long *freq)
+ *
+ * This function gets the current GPU clock rate.
+ */
+
+static int get_cur_freq(struct device *dev, unsigned long *freq)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        *freq = platform->clk_get_rate(dev);
+        return 0;
+}
+
+
+/*
  * gk20a_scale_init(dev)
  */
 
@@ -287,6 +301,7 @@ void gk20a_scale_init(struct device *dev)
                 profile->devfreq_profile.target = gk20a_scale_target;
                 profile->devfreq_profile.get_dev_status =
                         gk20a_scale_get_dev_status;
+                profile->devfreq_profile.get_cur_freq = get_cur_freq;
 
                 devfreq = devfreq_add_device(dev,
                                         &profile->devfreq_profile,