drm/radeon/kms/pm: don't enable pm if there is only on power state

agd5f · airlied · commit 90c390595002 · 2010-05-18T18:21:05.000+10:00
Just adds overhead when the power state will never change.

Signed-off-by: Alex Deucher &lt;alexdeucher@gmail.com&gt;
Signed-off-by: Dave Airlie &lt;airlied@redhat.com&gt;
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -113,7 +113,7 @@ int radeon_pm_init(struct radeon_device *rdev)
 
 	INIT_DELAYED_WORK(&rdev->pm.idle_work, radeon_pm_idle_work_handler);
 
-	if (radeon_dynpm != -1 && radeon_dynpm) {
+	if ((radeon_dynpm != -1 && radeon_dynpm) && (rdev->pm.num_power_states > 1)) {
 		rdev->pm.state = PM_STATE_PAUSED;
 		DRM_INFO("radeon: dynamic power management enabled\n");
 	}

Original file line number	Diff line number	Diff line change
`@@ -113,7 +113,7 @@ int radeon_pm_init(struct radeon_device *rdev)`
`113`	`113`
`114`	`114`	`INIT_DELAYED_WORK(&rdev->pm.idle_work, radeon_pm_idle_work_handler);`
`115`	`115`
`116`		`- if (radeon_dynpm != -1 && radeon_dynpm) {`
	`116`	`+ if ((radeon_dynpm != -1 && radeon_dynpm) && (rdev->pm.num_power_states > 1)) {`
`117`	`117`	`rdev->pm.state = PM_STATE_PAUSED;`
`118`	`118`	`DRM_INFO("radeon: dynamic power management enabled\n");`
`119`	`119`	`}`