[Intel-gfx] [PATCH 3/7] drm/i915: Add i915_get_crtc_scanline()

[ville.syrjala at linux.intel.com]

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

Refactor the i915_get_crtc_scanoutpos() code a bit to make the
"negative values during vblank" adjustment optional. For most uses
the raw scanline number without such adjustments is easier to use.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c  | 46 ++++++++++++++++++++++++++++------------
 drivers/gpu/drm/i915/intel_drv.h |  1 +
 2 files changed, 33 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 6b379de..49bcf4e 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -646,8 +646,8 @@ static bool intel_pipe_in_vblank(struct drm_device *dev, enum pipe pipe)
 	}
 }
 
-static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
-			     int *vpos, int *hpos)
+int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
+			     int *vpos, int *hpos, bool adjust)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
@@ -704,18 +704,20 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
 		vtotal *= htotal;
 	}
 
-	in_vbl = position >= vbl_start && position < vbl_end;
+	if (adjust) {
+		in_vbl = position >= vbl_start && position < vbl_end;
 
-	/*
-	 * While in vblank, position will be negative
-	 * counting up towards 0 at vbl_end. And outside
-	 * vblank, position will be positive counting
-	 * up since vbl_end.
-	 */
-	if (position >= vbl_start)
-		position -= vbl_end;
-	else
-		position += vtotal - vbl_end;
+		/*
+		 * While in vblank, position will be negative
+		 * counting up towards 0 at vbl_end. And outside
+		 * vblank, position will be positive counting
+		 * up since vbl_end.
+		 */
+		if (position >= vbl_start)
+			position -= vbl_end;
+		else
+			position += vtotal - vbl_end;
+	}
 
 	if (IS_GEN2(dev) || IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
 		*vpos = position;
@@ -732,6 +734,22 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
 	return ret;
 }
 
+static int i915_get_scanout_position(struct drm_device *dev, int pipe,
+				     int *vpos, int *hpos)
+{
+	return i915_get_crtc_scanoutpos(dev, pipe, vpos, hpos, true);
+}
+
+int i915_get_crtc_scanline(struct drm_crtc *crtc)
+{
+	int vpos = 0, hpos = 0;
+
+	i915_get_crtc_scanoutpos(crtc->dev, to_intel_crtc(crtc)->pipe,
+				 &vpos, &hpos, false);
+
+	return vpos;
+}
+
 static int i915_get_vblank_timestamp(struct drm_device *dev, int pipe,
 			      int *max_error,
 			      struct timeval *vblank_time,
@@ -3313,7 +3331,7 @@ void intel_irq_init(struct drm_device *dev)
 
 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		dev->driver->get_vblank_timestamp = i915_get_vblank_timestamp;
-		dev->driver->get_scanout_position = i915_get_crtc_scanoutpos;
+		dev->driver->get_scanout_position = i915_get_scanout_position;
 	}
 
 	if (IS_VALLEYVIEW(dev)) {
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index e33f387..7f5f74d 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -580,6 +580,7 @@ void snb_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
 void snb_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
 void hsw_pc8_disable_interrupts(struct drm_device *dev);
 void hsw_pc8_restore_interrupts(struct drm_device *dev);
+int i915_get_crtc_scanline(struct drm_crtc *crtc);
 
 
 /* intel_crt.c */
-- 
1.8.1.5