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drm/radeon: apply Murphy's law to the kms irq code v3

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1. It is really dangerous to have more than one
   spinlock protecting the same information.

2. radeon_irq_set sometimes wasn't called with lock
   protection, so it can happen that more than one
   CPU would tamper with the irq regs at the same
   time.

3. The pm.gui_idle variable was assuming that the 3D
   engine wasn't becoming idle between testing the
   register and setting the variable. So just remove
   it and test the register directly.

v2: Also handle the hpd irq code the same way.
v3: Rename hpd parameter for clarification.

Signed-off-by: Christian Koenig <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian Koenig
2012-05-17 01:33:30 +02:00
committed by Christian König
parent c20dc3698d
commit fb98257a9d
10 changed files with 144 additions and 119 deletions
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12
drivers/gpu/drm/radeon/radeon_pm.c
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@ -34,7 +34,6 @@
#define RADEON_IDLE_LOOP_MS 100
#define RADEON_RECLOCK_DELAY_MS 200
#define RADEON_WAIT_VBLANK_TIMEOUT 200
#define RADEON_WAIT_IDLE_TIMEOUT 200
static const char *radeon_pm_state_type_name[5] = {
"Default",
@ -257,15 +256,8 @@ static void radeon_pm_set_clocks(struct radeon_device *rdev)
/* gui idle int has issues on older chips it seems */
if (rdev->family >= CHIP_R600) {
if (rdev->irq.installed) {
/* wait for GPU idle */
rdev->pm.gui_idle = false;
rdev->irq.gui_idle = true;
radeon_irq_set(rdev);
wait_event_interruptible_timeout(
rdev->irq.idle_queue, rdev->pm.gui_idle,
msecs_to_jiffies(RADEON_WAIT_IDLE_TIMEOUT));
rdev->irq.gui_idle = false;
radeon_irq_set(rdev);
/* wait for GPU to become idle */
radeon_irq_kms_wait_gui_idle(rdev);
}
} else {
struct radeon_ring *ring = &rdev->ring[RADEON_RING_TYPE_GFX_INDEX];