[Nouveau] [RFC PATCH 16/29] clk: parse thermal policies for throttling thresholds

[Karol Herbst]

v2: use min_t

Signed-off-by: Karol Herbst <karolher...@gmail.com>
---
 drm/nouveau/include/nvkm/subdev/clk.h |  2 ++
 drm/nouveau/nvkm/subdev/clk/base.c    | 42 +++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/drm/nouveau/include/nvkm/subdev/clk.h 
b/drm/nouveau/include/nvkm/subdev/clk.h
index f35518c3..f5ff1fd9 100644
--- a/drm/nouveau/include/nvkm/subdev/clk.h
+++ b/drm/nouveau/include/nvkm/subdev/clk.h
@@ -104,6 +104,8 @@ struct nvkm_clk {
        struct nvkm_cstate *cstate;
        int exp_cstateid;
        u8  temp;
+       u8  max_temp;
+       u8  relax_temp;
 
        bool allow_reclock;
 #define NVKM_CLK_BOOST_NONE 0x0
diff --git a/drm/nouveau/nvkm/subdev/clk/base.c 
b/drm/nouveau/nvkm/subdev/clk/base.c
index 54188d2b..54e14936 100644
--- a/drm/nouveau/nvkm/subdev/clk/base.c
+++ b/drm/nouveau/nvkm/subdev/clk/base.c
@@ -27,6 +27,7 @@
 #include <subdev/bios/boost.h>
 #include <subdev/bios/cstep.h>
 #include <subdev/bios/perf.h>
+#include <subdev/bios/thermal_policies.h>
 #include <subdev/bios/vpstate.h>
 #include <subdev/fb.h>
 #include <subdev/therm.h>
@@ -659,6 +660,44 @@ nvkm_clk = {
        .fini = nvkm_clk_fini,
 };
 
+static void
+nvkm_clk_parse_max_temp(struct nvkm_clk *clk)
+{
+       struct nvkm_subdev *subdev = &clk->subdev;
+       struct nvkm_bios *bios = subdev->device->bios;
+       struct nvbios_thermal_policies_header header;
+       struct nvbios_thermal_policies_entry entry;
+       u8 i;
+       s16 mt = 0xff;
+       s16 rt = 0xff;
+
+       if (nvbios_thermal_policies_parse(bios, &header))
+               return;
+
+       if (!header.ecount)
+               return;
+
+       for (i = 0; i < header.ecount; i++) {
+               if (nvbios_thermal_policies_entry(bios, &header, i, &entry))
+                       return;
+
+               if (entry.mode != 1)
+                       continue;
+
+               mt = min_t(s16, mt, (entry.t0 + entry.down_offset) / 32);
+               rt = min_t(s16, rt, (entry.t0 + entry.up_offset) / 32);
+       }
+
+       if (mt == 0xff || rt == 0xff)
+               return;
+
+       clk->max_temp = mt;
+       clk->relax_temp = rt;
+
+       nvkm_debug(subdev, "setting up sw throttling thresholds (%u/%u°C)\n",
+                  clk->max_temp, clk->relax_temp);
+}
+
 int
 nvkm_clk_ctor(const struct nvkm_clk_func *func, struct nvkm_device *device,
              int index, bool allow_reclock, struct nvkm_clk *clk)
@@ -733,6 +772,9 @@ nvkm_clk_ctor(const struct nvkm_clk_func *func, struct 
nvkm_device *device,
 
        clk->boost_mode = nvkm_longopt(device->cfgopt, "NvBoost",
                                       NVKM_CLK_BOOST_NONE);
+
+       nvkm_clk_parse_max_temp(clk);
+
        return 0;
 }
 
-- 
2.14.1

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