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drm/nouveau/volt: Don't require perfect fit

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If we calculate the voltage in the table right, we get all kinds of values,
which never fit the hardware steps, so we use the closest higher value the
hardware can do.

v3: Simplify the implementation.
v5: Initialize best_err with volt->max_uv.

Signed-off-by: Karol Herbst <karolherbst@gmail.com>
Reviewed-by: Martin Peres <martin.peres@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 4b9ce6e7b6
commit 5e00e3263b
1 changed files with 17 additions and 5 deletions
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22
drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
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@ -51,18 +51,30 @@ static int
nvkm_volt_set(struct nvkm_volt *volt, u32 uv)
{
struct nvkm_subdev *subdev = &volt->subdev;
int i, ret = -EINVAL;
int i, ret = -EINVAL, best_err = volt->max_uv, best = -1;
if (volt->func->volt_set)
return volt->func->volt_set(volt, uv);
for (i = 0; i < volt->vid_nr; i++) {
if (volt->vid[i].uv == uv) {
ret = volt->func->vid_set(volt, volt->vid[i].vid);
nvkm_debug(subdev, "set %duv: %d\n", uv, ret);
int err = volt->vid[i].uv - uv;
if (err < 0 || err > best_err)
continue;
best_err = err;
best = i;
if (best_err == 0)
break;
}
}
if (best == -1) {
nvkm_error(subdev, "couldn't set %iuv\n", uv);
return ret;
}
ret = volt->func->vid_set(volt, volt->vid[best].vid);
nvkm_debug(subdev, "set req %duv to %duv: %d\n", uv,
volt->vid[best].uv, ret);
return ret;
}