We have a bit of fun with vblank waits not working correctly right away after enabling a crtc, so let's add more debug output to figure what's going on.

References: https://bugs.freedesktop.org/show_bug.cgi?id=84162 Signed-off-by: Daniel Vetter daniel.vetter@intel.com --- drivers/gpu/drm/drm_irq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 5ef03c216a27..5b5c32a08a45 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -1086,7 +1086,9 @@ void drm_wait_one_vblank(struct drm_device *dev, int crtc) last != drm_vblank_count(dev, crtc), msecs_to_jiffies(100));

- WARN(ret == 0, "vblank wait timed out on crtc %i\n", crtc); + WARN(ret == 0, + "vblank wait timed out on crtc %i, last: %u, current %u\n", + crtc, last, drm_vblank_count(dev, crtc));

drm_vblank_put(dev, crtc); }