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

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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);