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drm/nouveau/volt: save the voltage range we are able to set

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We shouldn't set voltages below the min or above the max voltage the gpu is
able to set, so save the range for future lookups.

Signed-off-by: Karol Herbst <karolherbst@gmail.de>
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 2016-02-26 07:49:08 +01:00 committed by Ben Skeggs
parent 22b6c9e8fe
commit 437bb44d38
2 changed files with 16 additions and 1 deletions
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3
drivers/gpu/drm/nouveau/include/nvkm/subdev/volt.h
View file

@ -12,6 +12,9 @@ struct nvkm_volt {
u32 uv;
u8 vid;
} vid[256];
u32 max_uv;
u32 min_uv;
};
int nvkm_volt_get(struct nvkm_volt *);

14
drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
View file

@ -120,6 +120,8 @@ nvkm_volt_parse_bios(struct nvkm_bios *bios, struct nvkm_volt *volt)
data = nvbios_volt_parse(bios, &ver, &hdr, &cnt, &len, &info);
if (data && info.vidmask && info.base && info.step) {
volt->min_uv = info.min;
volt->max_uv = info.max;
for (i = 0; i < info.vidmask + 1; i++) {
if (info.base >= info.min &&
info.base <= info.max) {
@ -131,6 +133,8 @@ nvkm_volt_parse_bios(struct nvkm_bios *bios, struct nvkm_volt *volt)
}
volt->vid_mask = info.vidmask;
} else if (data && info.vidmask) {
volt->min_uv = 0xffffffff;
volt->max_uv = 0;
for (i = 0; i < cnt; i++) {
data = nvbios_volt_entry_parse(bios, i, &ver, &hdr,
&ivid);
@ -138,9 +142,14 @@ nvkm_volt_parse_bios(struct nvkm_bios *bios, struct nvkm_volt *volt)
volt->vid[volt->vid_nr].uv = ivid.voltage;
volt->vid[volt->vid_nr].vid = ivid.vid;
volt->vid_nr++;
volt->min_uv = min(volt->min_uv, ivid.voltage);
volt->max_uv = max(volt->max_uv, ivid.voltage);
}
}
volt->vid_mask = info.vidmask;
} else if (data && info.type == NVBIOS_VOLT_PWM) {
volt->min_uv = info.base;
volt->max_uv = info.base + info.pwm_range;
}
}
@ -181,8 +190,11 @@ nvkm_volt_ctor(const struct nvkm_volt_func *func, struct nvkm_device *device,
volt->func = func;
/* Assuming the non-bios device should build the voltage table later */
if (bios)
if (bios) {
nvkm_volt_parse_bios(bios, volt);
nvkm_debug(&volt->subdev, "min: %iuv max: %iuv\n",
volt->min_uv, volt->max_uv);
}
if (volt->vid_nr) {
for (i = 0; i < volt->vid_nr; i++) {