Merge branches 'x86/acpi', 'x86/asm', 'x86/cpudetect', 'x86/crashdump', 'x86/debug...

[linux-2.6-omap-h63xx.git] / drivers / gpu / drm / i915 / i915_irq.c

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 0cadafbef411ba094d020d1323f66f136ba0d1bd..548ff2c66431ee93a205b15d84362084da7486ce 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -174,6 +174,19 @@ u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
        return count;
 }
 
+u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
+{
+       drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+       int reg = pipe ? PIPEB_FRMCOUNT_GM45 : PIPEA_FRMCOUNT_GM45;
+
+       if (!i915_pipe_enabled(dev, pipe)) {
+               DRM_ERROR("trying to get vblank count for disabled pipe %d\n", pipe);
+               return 0;
+       }
+
+       return I915_READ(reg);
+}
+
 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 {
        struct drm_device *dev = (struct drm_device *) arg;
@@ -411,6 +424,12 @@ int i915_enable_vblank(struct drm_device *dev, int pipe)
 {
        drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
        unsigned long irqflags;
+       int pipeconf_reg = (pipe == 0) ? PIPEACONF : PIPEBCONF;
+       u32 pipeconf;
+
+       pipeconf = I915_READ(pipeconf_reg);
+       if (!(pipeconf & PIPEACONF_ENABLE))
+               return -EINVAL;
 
        spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
        if (IS_I965G(dev))