[Intel-gfx] [PATCH 08/13] drm/i915/fbc: Make fence_id optional for i965gm

[Ville Syrjala]

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

i965gm no longer needs the fence for scanout so we should be
do what we do for ctg+ and only configure a fence for FBC
when we have one.

In theory this should do nothing atm on account of
intel_fbc_can_activate() requiring the fence, but since
we do this for g4x+ let's do it for i965gm as well. We
may want to relax the requirements at some point and allow
FBC without a fence.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_fbc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 707b9d0cdc9b..7b59a98cbd21 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -138,8 +138,10 @@ static void i8xx_fbc_activate(struct drm_i915_private *dev_priv)
 		u32 fbc_ctl2;
 
 		/* Set it up... */
-		fbc_ctl2 = FBC_CTL_FENCE_DBL | FBC_CTL_IDLE_IMM | FBC_CTL_CPU_FENCE;
+		fbc_ctl2 = FBC_CTL_FENCE_DBL | FBC_CTL_IDLE_IMM;
 		fbc_ctl2 |= FBC_CTL_PLANE(params->crtc.i9xx_plane);
+		if (params->fence_id >= 0)
+			fbc_ctl2 |= FBC_CTL_CPU_FENCE;
 		I915_WRITE(FBC_CONTROL2, fbc_ctl2);
 		I915_WRITE(FBC_FENCE_OFF, params->crtc.fence_y_offset);
 	}
@@ -151,7 +153,8 @@ static void i8xx_fbc_activate(struct drm_i915_private *dev_priv)
 	if (IS_I945GM(dev_priv))
 		fbc_ctl |= FBC_CTL_C3_IDLE; /* 945 needs special SR handling */
 	fbc_ctl |= (cfb_pitch & 0xff) << FBC_CTL_STRIDE_SHIFT;
-	fbc_ctl |= params->fence_id;
+	if (params->fence_id >= 0)
+		fbc_ctl |= params->fence_id;
 	I915_WRITE(FBC_CONTROL, fbc_ctl);
 }
 
-- 
2.23.0