[PATCH 2/5] drm/i915: Grab uncore.lock around enabling vblank evasion

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c     |  2 +-
 drivers/gpu/drm/i915/intel_drv.h    |  1 +
 drivers/gpu/drm/i915/intel_sprite.c | 10 ++++++----
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index b886bd459acc..eda9543a0199 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -845,7 +845,7 @@ static u32 __intel_get_crtc_scanline_from_timestamp(struct intel_crtc *crtc)
 }
 
 /* I915_READ_FW, only for fast reads of display block, no need for forcewake etc. */
-static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
+int __intel_get_crtc_scanline(struct intel_crtc *crtc)
 {
 	struct drm_device *dev = crtc->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 468ec1e90e16..fbdbbe741b2f 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1340,6 +1340,7 @@ static inline bool intel_irqs_enabled(struct drm_i915_private *dev_priv)
 }
 
 int intel_get_crtc_scanline(struct intel_crtc *crtc);
+int __intel_get_crtc_scanline(struct intel_crtc *crtc);
 void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv,
 				     u8 pipe_mask);
 void gen8_irq_power_well_pre_disable(struct drm_i915_private *dev_priv,
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 971a1ea0db45..3a34be4fd956 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -119,6 +119,7 @@ void intel_pipe_update_start(const struct intel_crtc_state *new_crtc_state)
 	crtc->debug.max_vbl = max;
 	trace_i915_pipe_update_start(crtc);
 
+	spin_lock(&dev_priv->uncore.lock);
 	for (;;) {
 		/*
 		 * prepare_to_wait() has a memory barrier, which guarantees
@@ -127,7 +128,7 @@ void intel_pipe_update_start(const struct intel_crtc_state *new_crtc_state)
 		 */
 		prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE);
 
-		scanline = intel_get_crtc_scanline(crtc);
+		scanline = __intel_get_crtc_scanline(crtc);
 		if (scanline < min || scanline > max)
 			break;
 
@@ -137,11 +138,11 @@ void intel_pipe_update_start(const struct intel_crtc_state *new_crtc_state)
 			break;
 		}
 
-		local_irq_enable();
+		spin_unlock_irq(&dev_priv->uncore.lock);
 
 		timeout = schedule_timeout(timeout);
 
-		local_irq_disable();
+		spin_lock_irq(&dev_priv->uncore.lock);
 	}
 
 	finish_wait(wq, &wait);
@@ -162,8 +163,9 @@ void intel_pipe_update_start(const struct intel_crtc_state *new_crtc_state)
 	 * FIXME figure out if BXT+ DSI suffers from this as well
 	 */
 	while (need_vlv_dsi_wa && scanline == vblank_start)
-		scanline = intel_get_crtc_scanline(crtc);
+		scanline = __intel_get_crtc_scanline(crtc);
 
+	spin_unlock(&dev_priv->uncore.lock);
 	crtc->debug.scanline_start = scanline;
 	crtc->debug.start_vbl_time = ktime_get();
 	crtc->debug.start_vbl_count = intel_crtc_get_vblank_counter(crtc);
-- 
2.16.1

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