drm/nouveau: Support devfreq for Tegra

Using pmu counters for usage stats. This enables dynamic frequency scaling on all of the currently supported Tegra gpus. The register offsets are valid for gk20a, gm20b, gp10b, and gv11b. If support is added for ga10b, this will need rearchitected. Signed-off-by: Aaron Kling <webgeek1234@gmail.com> Reviewed-by: Lyude Paul <lyude@redhat.com> [fixed tab alignment in gk20a_devfreq_target()] Signed-off-by: Lyude Paul <lyude@redhat.com> Link: https://lore.kernel.org/r/20250906-gk20a-devfreq-v2-1-0217f53ee355@gmail.com
2026-10-26 19:14:18 +00:00 · 2025-09-06 20:03:02 -05:00 · 2025-09-06 20:03:02 -05:00 · 6ca1701cec
commit 6ca1701cec
parent d5603737e7
12 changed files with 389 additions and 0 deletions
--- a/drivers/gpu/drm/nouveau/Kconfig
+++ b/drivers/gpu/drm/nouveau/Kconfig
--- a/drivers/gpu/drm/nouveau/include/nvkm/core/tegra.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/core/tegra.h
--- a/drivers/gpu/drm/nouveau/nouveau_platform.c
+++ b/drivers/gpu/drm/nouveau/nouveau_platform.c
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/Kbuild
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/Kbuild
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a.c
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a.h
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a.h
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a_devfreq.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a_devfreq.c
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a_devfreq.h
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk20a_devfreq.h
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gm20b.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gm20b.c
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gp10b.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gp10b.c
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gp10b.h
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gp10b.h