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drm/i915: assert_spin_locked for pipestat interrupt enable/disable 

Just to keep the paranoia equal also sprinkle locking asserts over the
pipestat interrupt enable/disable functions.

Again this results in false positives in the interrupt setup. Add
bogo-locking for these and a big comment explaining why it's there and
that it's indeed unnecessary.

v2: Fix up the spelling fail Paulo spotted in comments.

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2013-06-27 17:52:10 +02:00
parent 190d6cd5cd
commit b79480ba50
1 changed files with 14 additions and 0 deletions
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14
drivers/gpu/drm/i915/i915_irq.c
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@ -319,6 +319,8 @@ i915_enable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
u32 reg = PIPESTAT(pipe);
u32 pipestat = I915_READ(reg) & 0x7fff0000;
assert_spin_locked(&dev_priv->irq_lock);
if ((pipestat & mask) == mask)
return;
@ -334,6 +336,8 @@ i915_disable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
u32 reg = PIPESTAT(pipe);
u32 pipestat = I915_READ(reg) & 0x7fff0000;
assert_spin_locked(&dev_priv->irq_lock);
if ((pipestat & mask) == 0)
return;
@ -2818,6 +2822,7 @@ static int valleyview_irq_postinstall(struct drm_device *dev)
u32 gt_irqs;
u32 enable_mask;
u32 pipestat_enable = PLANE_FLIP_DONE_INT_EN_VLV;
unsigned long irqflags;
enable_mask = I915_DISPLAY_PORT_INTERRUPT;
enable_mask |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
@ -2843,9 +2848,13 @@ static int valleyview_irq_postinstall(struct drm_device *dev)
I915_WRITE(PIPESTAT(1), 0xffff);
POSTING_READ(VLV_IER);
/* Interrupt setup is already guaranteed to be single-threaded, this is
* just to make the assert_spin_locked check happy. */
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
i915_enable_pipestat(dev_priv, 0, pipestat_enable);
i915_enable_pipestat(dev_priv, 0, PIPE_GMBUS_EVENT_ENABLE);
i915_enable_pipestat(dev_priv, 1, pipestat_enable);
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
I915_WRITE(VLV_IIR, 0xffffffff);
I915_WRITE(VLV_IIR, 0xffffffff);
@ -3324,6 +3333,7 @@ static int i965_irq_postinstall(struct drm_device *dev)
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u32 enable_mask;
u32 error_mask;
unsigned long irqflags;
/* Unmask the interrupts that we always want on. */
dev_priv->irq_mask = ~(I915_ASLE_INTERRUPT |
@ -3342,7 +3352,11 @@ static int i965_irq_postinstall(struct drm_device *dev)
if (IS_G4X(dev))
enable_mask |= I915_BSD_USER_INTERRUPT;
/* Interrupt setup is already guaranteed to be single-threaded, this is
* just to make the assert_spin_locked check happy. */
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
i915_enable_pipestat(dev_priv, 0, PIPE_GMBUS_EVENT_ENABLE);
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
/*
* Enable some error detection, note the instruction error mask