gpu: nvgpu: vgpu: add devfreq support

Add devfreq governor support in order to allow frequency scaling
in virtualization config. GPU clock frequency operations are
re-directed to the server over RPC.

Bug 200237433

Change-Id: I1c8e565a4fff36d3456dc72ebb20795b7822650e
Signed-off-by: Sachit Kadle <skadle@nvidia.com>
Reviewed-on: http://git-master/r/1295542
(cherry picked from commit d5c956fc06697eda3829c67cb22987e538213b29)
Reviewed-on: http://git-master/r/1280968
(cherry picked from commit 25e2b3cf7cb5559a6849c0024d42c157564a9be2)
Reviewed-on: http://git-master/r/1321835
(cherry picked from commit f871b52fd3f553d6b6375a3c848fbca272ed8e29)
Reviewed-on: http://git-master/r/1313468
Tested-by: Aparna Das <aparnad@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Richard Zhao <rizhao@nvidia.com>
GVS: Gerrit_Virtual_Submit

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/platform_vgpu_tegra.c b/drivers/gpu/nvgpu/gk20a/platform_vgpu_tegra.c
index e33fc29f..f2c877f9 100644
--- a/drivers/gpu/nvgpu/gk20a/platform_vgpu_tegra.c
+++ b/drivers/gpu/nvgpu/gk20a/platform_vgpu_tegra.c
@@ -16,6 +16,7 @@
 #include "gk20a.h"
 #include "hal_gk20a.h"
 #include "platform_gk20a.h"
+#include "vgpu/clk_vgpu.h"
 
 #include <nvgpu/nvhost.h>
 
@@ -23,7 +24,14 @@ static int gk20a_tegra_probe(struct device *dev)
 {
 #ifdef CONFIG_TEGRA_GK20A_NVHOST
         struct gk20a_platform *platform = dev_get_drvdata(dev);
-        return nvgpu_get_nvhost_dev(platform->g);
+        int ret;
+
+        ret = nvgpu_get_nvhost_dev(platform->g);
+        if (ret)
+                return ret;
+
+        vgpu_init_clk_support(platform->g);
+        return 0;
 #else
         return 0;
 #endif
@@ -47,5 +55,11 @@ struct gk20a_platform vgpu_tegra_platform = {
         .probe = gk20a_tegra_probe,
         .default_big_page_size  = SZ_128K,
 
+        .clk_round_rate = vgpu_clk_round_rate,
+        .get_clk_freqs = vgpu_clk_get_freqs,
+
+        /* frequency scaling configuration */
+        .devfreq_governor = "userspace",
+
         .virtual_dev = true,
 };