Merge branch 'drm-intel-next' of git://anongit.freedesktop.org/drm-intel into drm-next

drm-intel-next-2016-05-22:
- cmd-parser support for direct reg->reg loads (Ken Graunke)
- better handle DP++ smart dongles (Ville)
- bxt guc fw loading support (Nick Hoathe)
- remove a bunch of struct typedefs from dpll code (Ander)
- tons of small work all over to avoid casting between drm_device and the i915
  dev struct (Tvrtko&Chris)
- untangle request retiring from other operations, also fixes reset stat corner
  cases (Chris)
- skl atomic watermark support from Matt Roper, yay!
- various wm handling bugfixes from Ville
- big pile of cdclck rework for bxt/skl (Ville)
- CABC (Content Adaptive Brigthness Control) for dsi panels (Jani&Deepak M)
- nonblocking atomic commits for plane-only updates (Maarten Lankhorst)
- bunch of PSR fixes&improvements
- untangle our map/pin/sg_iter code a bit (Dave Gordon)
drm-intel-next-2016-05-08:
- refactor stolen quirks to share code between early quirks and i915 (Joonas)
- refactor gem BO/vma funcstion (Tvrtko&Dave)
- backlight over DPCD support (Yetunde Abedisi)
- more dsi panel sequence support (Jani)
- lots of refactoring around handling iomaps, vma, ring access and related
  topics culmulating in removing the duplicated request tracking in the execlist
  code (Chris & Tvrtko) includes a small patch for core iomapping code
- hw state readout for bxt dsi (Ramalingam C)
- cdclk cleanups (Ville)
- dedupe chv pll code a bit (Ander)
- enable semaphores on gen8+ for legacy submission, to be able to have a direct
  comparison against execlist on the same platform (Chris) Not meant to be used
  for anything else but performance tuning
- lvds border bit hw state checker fix (Jani)
- rpm vs. shrinker/oom-notifier fixes (Praveen Paneri)
- l3 tuning (Imre)
- revert mst dp audio, it's totally non-functional and crash-y (Lyude)
- first official dmc for kbl (Rodrigo)
- and tons of small things all over as usual

* 'drm-intel-next' of git://anongit.freedesktop.org/drm-intel: (194 commits)
  drm/i915: Revert async unpin and nonblocking atomic commit
  drm/i915: Update DRIVER_DATE to 20160522
  drm/i915: Inline sg_next() for the optimised SGL iterator
  drm/i915: Introduce & use new lightweight SGL iterators
  drm/i915: optimise i915_gem_object_map() for small objects
  drm/i915: refactor i915_gem_object_pin_map()
  drm/i915/psr: Implement PSR2 w/a for gen9
  drm/i915/psr: Use ->get_aux_send_ctl functions
  drm/i915/psr: Order DP aux transactions correctly
  drm/i915/psr: Make idle_frames sensible again
  drm/i915/psr: Try to program link training times correctly
  drm/i915/userptr: Convert to drm_i915_private
  drm/i915: Allow nonblocking update of pageflips.
  drm/i915: Check for unpin correctness.
  Reapply "drm/i915: Avoid stalling on pending flips for legacy cursor updates"
  drm/i915: Make unpin async.
  drm/i915: Prepare connectors for nonblocking checks.
  drm/i915: Pass atomic states to fbc update functions.
  drm/i915: Remove reset_counter from intel_crtc.
  drm/i915: Remove queue_flip pointer.
  ...

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 66e5c1e412d3..5a773e437e2f 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -242,6 +242,37 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
 	store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);
 }
 
+/**
+ * drm_accurate_vblank_count - retrieve the master vblank counter
+ * @crtc: which counter to retrieve
+ *
+ * This function is similar to @drm_crtc_vblank_count but this
+ * function interpolates to handle a race with vblank irq's.
+ *
+ * This is mostly useful for hardware that can obtain the scanout
+ * position, but doesn't have a frame counter.
+ */
+u32 drm_accurate_vblank_count(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	unsigned int pipe = drm_crtc_index(crtc);
+	u32 vblank;
+	unsigned long flags;
+
+	WARN(!dev->driver->get_vblank_timestamp,
+	     "This function requires support for accurate vblank timestamps.");
+
+	spin_lock_irqsave(&dev->vblank_time_lock, flags);
+
+	drm_update_vblank_count(dev, pipe, 0);
+	vblank = drm_vblank_count(dev, pipe);
+
+	spin_unlock_irqrestore(&dev->vblank_time_lock, flags);
+
+	return vblank;
+}
+EXPORT_SYMBOL(drm_accurate_vblank_count);
+
 /*
  * Disable vblank irq's on crtc, make sure that last vblank count
  * of hardware and corresponding consistent software vblank counter