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drm/nouveau/mc: add nvkm_mc_enabled() function 

Add a function that allows us to query whether a given subdev is
currently enabled or not.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot 2016-12-13 17:11:18 +09:00 committed by Ben Skeggs
parent c1fcb14879
commit c599dd4b70
2 changed files with 11 additions and 0 deletions
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1
drivers/gpu/drm/nouveau/include/nvkm/subdev/mc.h
View File

@ -9,6 +9,7 @@ struct nvkm_mc {
void nvkm_mc_enable(struct nvkm_device *, enum nvkm_devidx);
void nvkm_mc_disable(struct nvkm_device *, enum nvkm_devidx);
bool nvkm_mc_enabled(struct nvkm_device *, enum nvkm_devidx);
void nvkm_mc_reset(struct nvkm_device *, enum nvkm_devidx);
void nvkm_mc_intr(struct nvkm_device *, bool *handled);
void nvkm_mc_intr_unarm(struct nvkm_device *);

10
drivers/gpu/drm/nouveau/nvkm/subdev/mc/base.c
View File

@ -161,6 +161,16 @@ nvkm_mc_enable(struct nvkm_device *device, enum nvkm_devidx devidx)
}
}
bool
nvkm_mc_enabled(struct nvkm_device *device, enum nvkm_devidx devidx)
{
u64 pmc_enable = nvkm_mc_reset_mask(device, false, devidx);
return (pmc_enable != 0) &&
((nvkm_rd32(device, 0x000200) & pmc_enable) == pmc_enable);
}
static int
nvkm_mc_fini(struct nvkm_subdev *subdev, bool suspend)
{