[PATCH 3/4] drm/i915: Disable/enable planes around mode set

[ville.syrjala at linux.intel.com]

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

When setting a display mode, disable all planes on the CRTC beforehand,
and re-enable them after the new mode has been set.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |   48 ++++++++++++++++++++++++++++++++++
 1 files changed, 48 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 72ac2f9..aec6cac 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3012,6 +3012,49 @@ void intel_cpt_verify_modeset(struct drm_device *dev, int pipe)
 	}
 }
 
+static int intel_crtc_disable_planes(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_plane *plane;
+
+	list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
+		int ret;
+
+		if (plane->crtc != crtc || !plane->fb)
+			continue;
+
+		ret = plane->funcs->disable_plane(plane);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int intel_crtc_enable_planes(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_plane *plane;
+
+	list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
+		int ret;
+
+		if (plane->crtc != crtc || !plane->fb)
+			continue;
+
+		ret = plane->funcs->update_plane(plane,
+						 plane->crtc, plane->fb,
+						 plane->crtc_x, plane->crtc_y,
+						 plane->crtc_w, plane->crtc_h,
+						 plane->src_x, plane->src_y,
+						 plane->src_w, plane->src_h);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 static void ironlake_crtc_enable(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
@@ -3060,6 +3103,7 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
 	intel_crtc_load_lut(crtc);
 
 	intel_enable_pipe(dev_priv, pipe, is_pch_port);
+	intel_crtc_enable_planes(crtc);
 	intel_enable_plane(dev_priv, plane, pipe);
 
 	if (is_pch_port)
@@ -3088,6 +3132,7 @@ static void ironlake_crtc_disable(struct drm_crtc *crtc)
 	drm_vblank_off(dev, pipe);
 	intel_crtc_update_cursor(crtc, false);
 
+	intel_crtc_disable_planes(crtc);
 	intel_disable_plane(dev_priv, plane, pipe);
 
 	if (dev_priv->cfb_plane == plane)
@@ -3233,6 +3278,7 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
 
 	intel_enable_pll(dev_priv, pipe);
 	intel_enable_pipe(dev_priv, pipe, false);
+
 	intel_enable_plane(dev_priv, plane, pipe);
 
 	intel_crtc_load_lut(crtc);
@@ -3241,6 +3287,7 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
 	/* Give the overlay scaler a chance to enable if it's on this pipe */
 	intel_crtc_dpms_overlay(intel_crtc, true);
 	intel_crtc_update_cursor(crtc, true);
+	intel_crtc_enable_planes(crtc);
 }
 
 static void i9xx_crtc_disable(struct drm_crtc *crtc)
@@ -3259,6 +3306,7 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
 	drm_vblank_off(dev, pipe);
 	intel_crtc_dpms_overlay(intel_crtc, false);
 	intel_crtc_update_cursor(crtc, false);
+	intel_crtc_disable_planes(crtc);
 
 	if (dev_priv->cfb_plane == plane)
 		intel_disable_fbc(dev);
-- 
1.7.3.4