diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/dev/pci/drm/i915_irq.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/dev/pci/drm/i915_irq.c b/sys/dev/pci/drm/i915_irq.c index 0fe89b323f4..62fa49c8fad 100644 --- a/sys/dev/pci/drm/i915_irq.c +++ b/sys/dev/pci/drm/i915_irq.c @@ -362,6 +362,10 @@ int i915_enable_vblank(struct drm_device *dev, int plane) { drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; int pipe = i915_get_pipe(dev, plane); + int pipeconf_reg = (pipe == 0) ? PIPEACONF : PIPEBCONF; + + if ((I915_READ(pipeconf_reg) & PIPEACONF_ENABLE) == 0) + return (EINVAL); mtx_enter(&dev_priv->user_irq_lock); i915_enable_pipestat(dev_priv, pipe, (IS_I965G(dev_priv) ? |