[Intel-gfx] [PATCH 01/10] drm/i915: Grab struct_mutex around all FBC updates

[ville.syrjala at linux.intel.com]

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

We need some protection for the FBC state, and since struct_mutex
is it currently in most places, make sure all FBC update/disable
calles are protected by it.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 12cf362..bce6e07 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3576,8 +3576,10 @@ static void haswell_crtc_disable_planes(struct drm_crtc *crtc)
 	drm_vblank_off(dev, pipe);
 
 	/* FBC must be disabled before disabling the plane on HSW. */
+	mutex_lock(&dev->struct_mutex);
 	if (dev_priv->fbc.plane == plane)
 		intel_disable_fbc(dev);
+	mutex_unlock(&dev->struct_mutex);
 
 	hsw_disable_ips(intel_crtc);
 
@@ -3717,8 +3719,10 @@ static void ironlake_crtc_disable(struct drm_crtc *crtc)
 	intel_crtc_wait_for_pending_flips(crtc);
 	drm_vblank_off(dev, pipe);
 
+	mutex_lock(&dev->struct_mutex);
 	if (dev_priv->fbc.plane == plane)
 		intel_disable_fbc(dev);
+	mutex_unlock(&dev->struct_mutex);
 
 	intel_crtc_update_cursor(crtc, false);
 	intel_disable_planes(crtc);
@@ -4102,7 +4106,9 @@ static void valleyview_crtc_enable(struct drm_crtc *crtc)
 	intel_enable_planes(crtc);
 	intel_crtc_update_cursor(crtc, true);
 
+	mutex_lock(&dev->struct_mutex);
 	intel_update_fbc(dev);
+	mutex_unlock(&dev->struct_mutex);
 
 	for_each_encoder_on_crtc(dev, crtc, encoder)
 		encoder->enable(encoder);
@@ -4146,7 +4152,9 @@ 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);
 
+	mutex_lock(&dev->struct_mutex);
 	intel_update_fbc(dev);
+	mutex_unlock(&dev->struct_mutex);
 
 	for_each_encoder_on_crtc(dev, crtc, encoder)
 		encoder->enable(encoder);
@@ -4210,7 +4218,9 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
 	intel_crtc->active = false;
 	intel_update_watermarks(crtc);
 
+	mutex_lock(&dev->struct_mutex);
 	intel_update_fbc(dev);
+	mutex_unlock(&dev->struct_mutex);
 }
 
 static void i9xx_crtc_off(struct drm_crtc *crtc)
-- 
1.8.1.5