[Intel-gfx] [PATCH 09/25] drm/i915: Reject fbc on g4x when sprites are enabled

[ville.syrjala at linux.intel.com]

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

WaFbcDisabledForOverlaySprite:ctg says we need to disallow fbc when
sprites are enabled.

We don't currently expose the sprites on g4x, but maybe we will later.
Add the appropriate check to fbc2_possible(). We will also need to
adjust the sprite code to turn off fbc prior to enabling the sprite,
but let's leave that until we actually get g4x sprite support.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index cdadf6e..b09d1a2 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -523,6 +523,7 @@ static bool intel_fbc1_possible(struct intel_crtc *crtc)
 static bool intel_fbc2_possible(struct intel_crtc *crtc)
 {
 	struct drm_device *dev = crtc->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_framebuffer *fb = crtc->base.primary->fb;
 	struct drm_i915_gem_object *obj;
 	int max_width, max_height;
@@ -563,6 +564,14 @@ static bool intel_fbc2_possible(struct intel_crtc *crtc)
 				  pipe_name(crtc->pipe), plane_name(crtc->plane));
 			return false;
 		}
+
+		/* WaFbcDisabledForOverlaySprite:ctg */
+		/* FIXME need to figure this out nicer */
+		if (I915_READ(DVSCNTR(crtc->pipe)) & DVS_ENABLE) {
+			DRM_DEBUG("FBC pipe %c, plane %c: video sprite enabled\n",
+				  pipe_name(crtc->pipe), plane_name(crtc->plane));
+			return false;
+		}
 	}
 
 	if (IS_GEN5(dev) && crtc->config.pch_pfit.enabled) {
-- 
1.8.5.5