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| author | Alexandre Courbot <acourbot@nvidia.com> | 2016-04-01 15:40:59 +0900 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2016-05-20 14:43:04 +1000 |
| commit | c6007dc4e55e1a483c4d1e32dc1055b41aeacfc1 (patch) | |
| tree | f2114f0010978daed3c954fb88e5b605bc02170f /drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c | |
| parent | 4dc28134a8c124aa01b441e1e5b8b54312edc5dd (diff) | |
| download | op-kernel-dev-c6007dc4e55e1a483c4d1e32dc1055b41aeacfc1.zip op-kernel-dev-c6007dc4e55e1a483c4d1e32dc1055b41aeacfc1.tar.gz | |
drm/nouveau/devinit/gf100: make devinit on resume safer
In case of successful suspend, devinit will have to be run and this is
the behavior currently hardcoded. However, as FD bug 94725 suggests,
there might be cases where runtime suspend leaves the GPU powered, and
in such cases devinit should not be run on resume.
On GF100+ we have a reliable way to know whether we need to run devinit.
Use it instead of blindly trusting the flag set by nvkm_devinit_fini().
The code around the NvForcePost also needs to be slightly reworked in
order to keep working.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Suggested-by: Dave Airlie <airlied@redhat.com>
Suggested-by: Karol Herbst <nouveau@karolherbst.de>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c b/drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c index 2923598..8b1b34c 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/devinit/gf100.c @@ -97,9 +97,11 @@ gf100_devinit_preinit(struct nvkm_devinit *base) struct nvkm_subdev *subdev = &init->base.subdev; struct nvkm_device *device = subdev->device; - /* This bit is set by devinit, and flips back to 0 on suspend */ - if (!base->post) - base->post = ((nvkm_rd32(device, 0x2240c) & BIT(1)) == 0); + /* + * This bit is set by devinit, and flips back to 0 on suspend. We + * can use it as a reliable way to know whether we should run devinit. + */ + base->post = ((nvkm_rd32(device, 0x2240c) & BIT(1)) == 0); } static const struct nvkm_devinit_func |
