From: Lyude Paul <lyude@redhat.com>
Date: Thu, 1 Feb 2018 13:13:59 -0500
Subject: drm/nouveau: Introduce NvPmEnableGating option
Git-commit: 3ea74559d851b0e3f611da45d0dd9d505c4f44d5
Patch-mainline: v4.16-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

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>
Reviewed-by: Martin Peres <martin.peres@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- 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
 	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