drm/i915: optimize vblank waits in set_base_atomic

We only need to do them if the pipe is actually running and if the
framebuffers have changed. Removes two "wait for vblank timed out"
messages when doing a suspend/resume cycle on my i855gm.

v2: s/to_intel_ctrc(crtc)/intel_crtc/ spotted by Chris.

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/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c112466..988e3de 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2212,7 +2212,8 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
        crtc->y = y;
 
        if (old_fb) {
-               intel_wait_for_vblank(dev, intel_crtc->pipe);
+               if (intel_crtc->active && old_fb != fb)
+                       intel_wait_for_vblank(dev, intel_crtc->pipe);
                intel_unpin_fb_obj(to_intel_framebuffer(old_fb)->obj);
        }