drm/i915: Don't pretend that gen2 has a hardware frame counter

Gen2 doesn't have a hardware frame counter that can be read out. Just
provide a stub .get_vblank_counter() that always returns 0 instead of
trying to read non-existing registers.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index a7174ac..26753b6 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -518,6 +518,12 @@ i915_pipe_enabled(struct drm_device *dev, int pipe)
        }
 }
 
+static u32 i8xx_get_vblank_counter(struct drm_device *dev, int pipe)
+{
+       /* Gen2 doesn't have a hardware frame counter */
+       return 0;
+}
+
 /* Called from drm generic code, passed a 'crtc', which
  * we use as a pipe index
  */
@@ -3245,7 +3251,10 @@ void intel_irq_init(struct drm_device *dev)
 
        pm_qos_add_request(&dev_priv->pm_qos, PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE);
 
-       if (IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
+       if (IS_GEN2(dev)) {
+               dev->max_vblank_count = 0;
+               dev->driver->get_vblank_counter = i8xx_get_vblank_counter;
+       } else if (IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
                dev->max_vblank_count = 0xffffffff; /* full 32 bit counter */
                dev->driver->get_vblank_counter = gm45_get_vblank_counter;
        } else {