gpu: nvgpu: round clock locally

In gp10b_round_clk_rate(), we currently call
clk_round_rate() to round the clock rate for us

But since the frequency table is prepared
using the frequency values supported in h/w,
we can round the rate locally using the table

Bug 1827281

Change-Id: I85d034326539590352badceb4164aa5d89ee8842
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1280630
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c b/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c
index 5e5c7703..9fabe1f5 100644
--- a/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c
+++ b/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c
@@ -328,9 +328,17 @@ static unsigned long gp10b_get_clk_rate(struct device *dev)
 
 static long gp10b_round_clk_rate(struct device *dev, unsigned long rate)
 {
-        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a *g = get_gk20a(dev);
+        struct gk20a_scale_profile *profile = g->scale_profile;
+        unsigned long *freq_table = profile->devfreq_profile.freq_table;
+        int max_states = profile->devfreq_profile.max_state;
+        int i;
+
+        for (i = 0; i < max_states; ++i)
+                if (freq_table[i] > rate)
+                        return freq_table[i];
 
-        return clk_round_rate(platform->clk[0], rate);
+        return freq_table[max_states - 1];
 }
 
 static int gp10b_set_clk_rate(struct device *dev, unsigned long rate)