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drm/nouveau/clk: Don't create cstates with voltages higher than what the gpu can do

Browse source 
nvkm_volt_map_min is a copy of nvkm_volt_map, which always returns the
lowest possible voltage for a cstate.

nvkm_volt_map will get a temperature parameter there later and also fix
the voltage calculation, so that this functions will be completly
different later.

Signed-off-by: Karol Herbst <karolherbst@gmail.com>
Reviewed-by: Martin Peres <martin.peres@free.fr>
Tested-by: Pierre Moreau <pierre.morrow@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Karol Herbst 2016-07-12 21:36:08 +02:00 committed by Ben Skeggs
parent 17f486de6a
commit 17d063dbdc
3 changed files with 27 additions and 0 deletions
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1
drivers/gpu/drm/nouveau/include/nvkm/subdev/volt.h
View file

@ -17,6 +17,7 @@ struct nvkm_volt {
u32 min_uv;
};
int nvkm_volt_map_min(struct nvkm_volt *volt, u8 id);
int nvkm_volt_get(struct nvkm_volt *);
int nvkm_volt_set_id(struct nvkm_volt *, u8 id, int condition);

4
drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c
View file

@ -138,6 +138,7 @@ static int
nvkm_cstate_new(struct nvkm_clk *clk, int idx, struct nvkm_pstate *pstate)
{
struct nvkm_bios *bios = clk->subdev.device->bios;
struct nvkm_volt *volt = clk->subdev.device->volt;
const struct nvkm_domain *domain = clk->domains;
struct nvkm_cstate *cstate = NULL;
struct nvbios_cstepX cstepX;
@ -148,6 +149,9 @@ nvkm_cstate_new(struct nvkm_clk *clk, int idx, struct nvkm_pstate *pstate)
if (!data)
return -ENOENT;
if (volt && nvkm_volt_map_min(volt, cstepX.voltage) > volt->max_uv)
return -EINVAL;
cstate = kzalloc(sizeof(*cstate), GFP_KERNEL);
if (!cstate)
return -ENOMEM;

22
drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
View file

@ -65,6 +65,28 @@ nvkm_volt_set(struct nvkm_volt *volt, u32 uv)
return ret;
}
int
nvkm_volt_map_min(struct nvkm_volt *volt, u8 id)
{
struct nvkm_bios *bios = volt->subdev.device->bios;
struct nvbios_vmap_entry info;
u8 ver, len;
u16 vmap;
vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);
if (vmap) {
if (info.link != 0xff) {
int ret = nvkm_volt_map_min(volt, info.link);
if (ret < 0)
return ret;
info.min += ret;
}
return info.min;
}
return id ? id * 10000 : -ENODEV;
}
static int
nvkm_volt_map(struct nvkm_volt *volt, u8 id)
{