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Subject[RFC 5/5] drm/nouveau: Introduce NvPmEnableGating option
Date
This adds the NvPmEnableGating config option to nouveau, which can be
used to enable or disable clockgating for supported chipsets. Enabling
can be done by passing

config=NvPmEnableGating=1

To nouveau. If your chipset supports it, you'll see a message in your
kernel log indicating that clockgating is enabled. Since clockgating has
only had limited testing thus far, we leave this option disabled by
default for now.

Signed-off-by: Lyude Paul <lyude@redhat.com>
---
drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
index de07bc07abdb..bf62303571b3 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
@@ -434,7 +434,9 @@ nvkm_therm_ctor(struct nvkm_therm *therm, struct nvkm_device *device,
therm->attr_get = nvkm_therm_attr_get;
therm->attr_set = nvkm_therm_attr_set;
therm->mode = therm->suspend = -1; /* undefined */
- therm->clkgating_enabled = false;
+
+ therm->clkgating_enabled = nvkm_boolopt(device->cfgopt,
+ "NvPmEnableGating", false);
}

int
--
2.14.3
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