gpu: nvgpu: tegra gpu to emc frequency mapping

o emc clock scaling (bug fix):
  Take the gpu load into account for gpu frequencies less
  than or equal to fmax @ Vmin.

Bug 1591643

Change-Id: I0298adfdd4b7111557907c3bd6022fd6005355f0
Signed-off-by: Anders Kugler <akugler@nvidia.com>
Reviewed-on: http://git-master/r/735846
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c b/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c
index a6dc8a35..41af2ca0 100644
--- a/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c
+++ b/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c
@@ -162,8 +162,9 @@ static unsigned long gk20a_tegra_get_emc_rate(struct gk20a *g,
         gpu_fmax_at_vmin = tegra_dvfs_get_fmax_at_vmin_safe_t(
                 clk_get_parent(g->clk.tegra_clk));
 
-        /* When scaling emc, only account for the gpu load below fmax@vmin */
-        if (gpu_freq < gpu_fmax_at_vmin)
+        /* When scaling emc, account for the gpu load when the
+         * gpu frequency is less than or equal to fmax@vmin. */
+        if (gpu_freq <= gpu_fmax_at_vmin)
                 emc_scale = min(g->pmu.load_avg, g->emc3d_ratio);
         else
                 emc_scale = g->emc3d_ratio;