[PATCH 2/6] drm/i915: Use of a CPU fence is mandatory to update FBC regions upon CPU writes

[Chris Wilson <chris@chris-wilson.co.uk>]

...and this requirement is enforced by intel_update_fbc() so we can
remove the later check from g4x_enable_fbc() and ironlake_enable_fbc().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_display.c |   16 ++++------------
 1 files changed, 4 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 577229d..0cbae6c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1492,12 +1492,8 @@ static void g4x_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
 	dev_priv->cfb_y = crtc->y;
 
 	dpfc_ctl = plane | DPFC_SR_EN | DPFC_CTL_LIMIT_1X;
-	if (obj->tiling_mode != I915_TILING_NONE) {
-		dpfc_ctl |= DPFC_CTL_FENCE_EN | dev_priv->cfb_fence;
-		I915_WRITE(DPFC_CHICKEN, DPFC_HT_MODIFY);
-	} else {
-		I915_WRITE(DPFC_CHICKEN, ~DPFC_HT_MODIFY);
-	}
+	dpfc_ctl |= DPFC_CTL_FENCE_EN | dev_priv->cfb_fence;
+	I915_WRITE(DPFC_CHICKEN, DPFC_HT_MODIFY);
 
 	I915_WRITE(DPFC_RECOMP_CTL, DPFC_RECOMP_STALL_EN |
 		   (stall_watermark << DPFC_RECOMP_STALL_WM_SHIFT) |
@@ -1583,12 +1579,8 @@ static void ironlake_enable_fbc(struct drm_crtc *crtc, unsigned long interval)
 
 	dpfc_ctl &= DPFC_RESERVED;
 	dpfc_ctl |= (plane | DPFC_CTL_LIMIT_1X);
-	if (obj->tiling_mode != I915_TILING_NONE) {
-		dpfc_ctl |= (DPFC_CTL_FENCE_EN | dev_priv->cfb_fence);
-		I915_WRITE(ILK_DPFC_CHICKEN, DPFC_HT_MODIFY);
-	} else {
-		I915_WRITE(ILK_DPFC_CHICKEN, ~DPFC_HT_MODIFY);
-	}
+	dpfc_ctl |= (DPFC_CTL_FENCE_EN | dev_priv->cfb_fence);
+	I915_WRITE(ILK_DPFC_CHICKEN, DPFC_HT_MODIFY);
 
 	I915_WRITE(ILK_DPFC_RECOMP_CTL, DPFC_RECOMP_STALL_EN |
 		   (stall_watermark << DPFC_RECOMP_STALL_WM_SHIFT) |
-- 
1.7.5.4