[PATCH 4/4] drm/radeon: don't allow runpm=1 on systems with out ATPX

[Alex Deucher]

vgaswitcheroo and the ATPX ACPI methods are required to
power down the dGPU.

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=73901

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Cc: stable at vger.kernel.org
---
 drivers/gpu/drm/radeon/radeon_kms.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 9337820..f4a9c5d 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -107,11 +107,9 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
 		flags |= RADEON_IS_PCI;
 	}
 
-	if (radeon_runtime_pm == 1)
-		flags |= RADEON_IS_PX;
-	else if ((radeon_runtime_pm == -1) &&
-		 radeon_has_atpx() &&
-		 ((flags & RADEON_IS_IGP) == 0))
+	if ((radeon_runtime_pm != 0) &&
+	    radeon_has_atpx() &&
+	    ((flags & RADEON_IS_IGP) == 0))
 		flags |= RADEON_IS_PX;
 
 	/* radeon_device_init should report only fatal error
-- 
1.8.3.1