[Intel-gfx] [PATCH 4/9] drm/i915: Use LRI based FBC render tracking for ILK

[ville.syrjala at linux.intel.com]

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

ILK should work pretty much the same as SNB, except it
doesn't have the blitter, so we only care about render tracking.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h         |  2 +-
 drivers/gpu/drm/i915/intel_pm.c         |  2 --
 drivers/gpu/drm/i915/intel_ringbuffer.c | 57 +++++++++++++++++----------------
 3 files changed, 31 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1777beb..db532cf 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1091,7 +1091,7 @@
 #define ILK_DPFC_CHICKEN	0x43224
 #define ILK_FBC_RT_BASE		0x2128
 #define   ILK_FBC_RT_VALID	(1<<0)
-#define   SNB_FBC_FRONT_BUFFER	(1<<1)
+#define   ILK_FBC_FRONT_BUFFER	(1<<1)
 
 #define ILK_DISPLAY_CHICKEN1	0x42000
 #define   ILK_FBCQ_DIS		(1<<22)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f46bb56..4039aa3 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -210,8 +210,6 @@ static void ironlake_enable_fbc(struct drm_crtc *crtc,
 		   (stall_watermark << DPFC_RECOMP_STALL_WM_SHIFT) |
 		   (interval << DPFC_RECOMP_TIMER_COUNT_SHIFT));
 	I915_WRITE(ILK_DPFC_FENCE_YOFF, crtc->y);
-	if (IS_GEN5(dev))
-		I915_WRITE(ILK_FBC_RT_BASE, i915_gem_obj_ggtt_offset(obj) | ILK_FBC_RT_VALID);
 	/* enable it... */
 	I915_WRITE(ILK_DPFC_CONTROL, dpfc_ctl | DPFC_CTL_EN);
 
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 2e62d76..a02d472 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -77,6 +77,32 @@ gen2_render_ring_flush(struct intel_ring_buffer *ring,
 	return 0;
 }
 
+static int gen5_render_fbc_tracking(struct intel_ring_buffer *ring)
+{
+	int ret;
+
+	if (!ring->fbc_address_dirty)
+		return 0;
+
+	ret = intel_ring_begin(ring, 4);
+	if (ret)
+		return ret;
+
+	intel_ring_emit(ring, MI_NOOP);
+	intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
+	intel_ring_emit(ring, ILK_FBC_RT_BASE);
+	if (ring->fbc_address != -1)
+		intel_ring_emit(ring, ring->fbc_address |
+				ILK_FBC_FRONT_BUFFER | ILK_FBC_RT_VALID);
+	else
+		intel_ring_emit(ring, 0);
+	intel_ring_advance(ring);
+
+	ring->fbc_address_dirty = false;
+
+	return 0;
+}
+
 static int
 gen4_render_ring_flush(struct intel_ring_buffer *ring,
 		       u32	invalidate_domains,
@@ -132,6 +158,9 @@ gen4_render_ring_flush(struct intel_ring_buffer *ring,
 	intel_ring_emit(ring, MI_NOOP);
 	intel_ring_advance(ring);
 
+	if (invalidate_domains && IS_GEN5(dev))
+		return gen5_render_fbc_tracking(ring);
+
 	return 0;
 }
 
@@ -232,32 +261,6 @@ static int gen6_blt_fbc_tracking(struct intel_ring_buffer *ring)
 	return 0;
 }
 
-static int gen6_render_fbc_tracking(struct intel_ring_buffer *ring)
-{
-	int ret;
-
-	if (!ring->fbc_address_dirty)
-		return 0;
-
-	ret = intel_ring_begin(ring, 4);
-	if (ret)
-		return ret;
-
-	intel_ring_emit(ring, MI_NOOP);
-	intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
-	intel_ring_emit(ring, ILK_FBC_RT_BASE);
-	if (ring->fbc_address != -1)
-		intel_ring_emit(ring, ring->fbc_address |
-				SNB_FBC_FRONT_BUFFER | ILK_FBC_RT_VALID);
-	else
-		intel_ring_emit(ring, 0);
-	intel_ring_advance(ring);
-
-	ring->fbc_address_dirty = false;
-
-	return 0;
-}
-
 static int
 gen6_render_ring_flush(struct intel_ring_buffer *ring,
                          u32 invalidate_domains, u32 flush_domains)
@@ -308,7 +311,7 @@ gen6_render_ring_flush(struct intel_ring_buffer *ring,
 	intel_ring_advance(ring);
 
 	if (invalidate_domains)
-		return gen6_render_fbc_tracking(ring);
+		return gen5_render_fbc_tracking(ring);
 
 	return 0;
 }
-- 
1.8.3.2