drm/i915: implement ironlake_wait_for_vblank

intel_wait_for_vblank uses PIPESTAT, which does not exist on Ironlake
and newer, so now we use PIPEFRAME.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
[danvet: Ditch the check for disable pipe from the new ilk wait for
vblank function to keep it consisten with existing behaviour.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ae3f4454928e..b322bde98675 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -784,6 +784,17 @@ intel_find_pll_g4x_dp(const intel_limit_t *limit, struct drm_crtc *crtc,
         return true;
 }
 
+static void ironlake_wait_for_vblank(struct drm_device *dev, int pipe)
+{
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        u32 frame, frame_reg = PIPEFRAME(pipe);
+
+        frame = I915_READ(frame_reg);
+
+        if (wait_for(I915_READ_NOTRACE(frame_reg) != frame, 50))
+                DRM_DEBUG_KMS("vblank wait timed out\n");
+}
+
 /**
  * intel_wait_for_vblank - wait for vblank on a given pipe
  * @dev: drm device
@@ -797,6 +808,11 @@ void intel_wait_for_vblank(struct drm_device *dev, int pipe)
         struct drm_i915_private *dev_priv = dev->dev_private;
         int pipestat_reg = PIPESTAT(pipe);
 
+        if (INTEL_INFO(dev)->gen >= 5) {
+                ironlake_wait_for_vblank(dev, pipe);
+                return;
+        }
+
         /* Clear existing vblank status. Note this will clear any other
          * sticky status fields as well.
          *