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drm/radeon/kms/pm: bail early if nothing's changing 

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>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2010-08-13 10:53:35 -04:00 committed by Dave Airlie
parent 4aab97e818
commit 4e186b2d6c
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/radeon/radeon_pm.c
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@ -226,6 +226,11 @@ 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);