diff options
| author | Alex Deucher <alexdeucher@gmail.com> | 2010-08-13 10:53:35 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-26 16:46:20 -0700 |
| commit | 0e485a9e6662219a4458f08c0dce6ff1a7222d8a (patch) | |
| tree | c90855fad92a237fa4438de004d5b6df50b7b056 | |
| parent | eeba6084bb7f45c3fdedbce67cffd6bcef834ef8 (diff) | |
drm/radeon/kms/pm: bail early if nothing's changing
commit 4e186b2d6c878793587c35d7f06c94565d76e9b8 upstream.
If we aren't changing the power state, no need to take
locks and schedule fences, etc.
There seem to be lock ordering issues in the CP and
fence code in some cases; see bug 29140 below.
Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=29140
Possibly also:
https://bugzilla.kernel.org/show_bug.cgi?id=16581
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_pm.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c index 3fa6984d9896..c91b741d5b4f 100644 --- a/drivers/gpu/drm/radeon/radeon_pm.c +++ b/drivers/gpu/drm/radeon/radeon_pm.c @@ -224,6 +224,11 @@ static void radeon_pm_set_clocks(struct radeon_device *rdev) { int i; + /* no need to take locks, etc. if nothing's going to change */ + if ((rdev->pm.requested_clock_mode_index == rdev->pm.current_clock_mode_index) && + (rdev->pm.requested_power_state_index == rdev->pm.current_power_state_index)) + return; + mutex_lock(&rdev->ddev->struct_mutex); mutex_lock(&rdev->vram_mutex); mutex_lock(&rdev->cp.mutex); |