[Intel-gfx] [PATCH 4/4] drm/i915: don't set the FBC plane select bits on HSW+

[Paulo Zanoni]

From: Paulo Zanoni <paulo.r.zanoni at intel.com>

This commit is just to make the intentions explicit: on HSW+ these
bits are MBZ, but since we only support plane A and the macro
evaluates to zero when plane A is the parameter, we're not fixing any
bug.

v2:
 - Remove useless extra blank like (Chris).
 - Init dpfc_ctl in another place (Chris).

Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 drivers/gpu/drm/i915/intel_fbc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index 1ff288c..50ed333 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -262,7 +262,10 @@ static void gen7_fbc_enable(struct drm_crtc *crtc)
 
 	dev_priv->fbc.enabled = true;
 
-	dpfc_ctl = IVB_DPFC_CTL_PLANE(intel_crtc->plane);
+	dpfc_ctl = 0;
+	if (IS_IVYBRIDGE(dev))
+		dpfc_ctl |= IVB_DPFC_CTL_PLANE(intel_crtc->plane);
+
 	if (drm_format_plane_cpp(fb->pixel_format, 0) == 2)
 		dev_priv->fbc.threshold++;
 
-- 
2.1.4