gpu: nvgpu: check for valid function pointers

Before calling prod settings functions, check for
availability of those functions.

Similar check is extended for get_clk_freqs.

Bug 1735760

Change-Id: Ic4b38079043ab2049a479a2d8bb0cb6091e94f4a
Signed-off-by: seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-on: http://git-master/r/1181571
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Adeel Raza <araza@nvidia.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_scale.c b/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
index eeabd919..ec9ca5db 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_scale.c
@@ -118,10 +118,13 @@ static int gk20a_scale_make_freq_table(struct gk20a_scale_profile *profile)
         int num_freqs, err;
         unsigned long *freqs;
 
-        /* get gpu frequency table */
-        err = platform->get_clk_freqs(profile->dev, &freqs,
+        if (platform->get_clk_freqs) {
+                /* get gpu frequency table */
+                err = platform->get_clk_freqs(profile->dev, &freqs,
                                         &num_freqs);
-        if (err)
+                if (err)
+                        return -ENOSYS;
+        } else
                 return -ENOSYS;
 
         profile->devfreq_profile.freq_table = (unsigned long *)freqs;