[Intel-gfx] [PATCH v2 09/24] drm/i915: Keep vblank interrupts enabled while enabling/disabling planes

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Becasue of the upcoming vblank interrupt driven watermark update
mechanism we will have use for vblank interrupts during plane
enabling/disabling. So don't call drm_vblank_off() until planes
are off, and call drm_vblank_on() just before we start to enable
the planes.

v2: Pimp commit message (Paulo)

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 88df4ea..8d2a31e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3547,6 +3547,8 @@ static void ilk_crtc_enable_planes(struct drm_crtc *crtc)
 	int pipe = intel_crtc->pipe;
 	int plane = intel_crtc->plane;
 
+	drm_vblank_on(dev, pipe);
+
 	intel_enable_primary_plane(dev_priv, plane, pipe);
 	intel_enable_planes(crtc);
 	intel_crtc_update_cursor(crtc, true);
@@ -3557,8 +3559,6 @@ static void ilk_crtc_enable_planes(struct drm_crtc *crtc)
 	mutex_lock(&dev->struct_mutex);
 	intel_update_fbc(dev);
 	mutex_unlock(&dev->struct_mutex);
-
-	drm_vblank_on(dev, pipe);
 }
 
 static void ilk_crtc_disable_planes(struct drm_crtc *crtc)
@@ -3570,7 +3570,6 @@ static void ilk_crtc_disable_planes(struct drm_crtc *crtc)
 	int plane = intel_crtc->plane;
 
 	intel_crtc_wait_for_pending_flips(crtc);
-	drm_vblank_off(dev, pipe);
 
 	if (dev_priv->fbc.plane == plane)
 		intel_disable_fbc(dev);
@@ -3581,6 +3580,8 @@ static void ilk_crtc_disable_planes(struct drm_crtc *crtc)
 	intel_disable_planes(crtc);
 	intel_disable_primary_plane(dev_priv, plane, pipe);
 	intel_wait_for_vblank(dev, pipe);
+
+	drm_vblank_off(dev, pipe);
 }
 
 static void ironlake_crtc_enable(struct drm_crtc *crtc)
-- 
1.8.3.2