[Intel-gfx] [PATCH 3/3] drm/i915 invalidate indirect state pointers at end of ring exec

[Zou Nan hai]

this is required by spec, without this patch.
some 3D programs will hang after resume from RC6.

Signed-off-by: Zou Nan hai <nanhai.zou at intel.com>
---
 drivers/gpu/drm/i915/i915_dma.c         |    7 +++++++
 drivers/gpu/drm/i915/i915_reg.h         |    1 +
 drivers/gpu/drm/i915/intel_ringbuffer.c |    9 +++++++++
 3 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 84ce956..0bc5f0f 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -494,6 +494,13 @@ static int i915_dispatch_batchbuffer(struct drm_device * dev,
 		}
 	}
 
+
+	if (IS_G4X(dev) || IS_IRONLAKE(dev)) {
+		BEGIN_LP_RING(2);
+		OUT_RING(MI_FLUSH | MI_NO_WRITE_FLUSH | MI_INVALIDATE_ISP);
+		OUT_RING(MI_NOOP);
+		ADVANCE_LP_RING();
+	}
 	i915_emit_breadcrumb(dev);
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 96103ae..e7eca57 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -170,6 +170,7 @@
 #define   MI_NO_WRITE_FLUSH	(1 << 2)
 #define   MI_SCENE_COUNT	(1 << 3) /* just increment scene count */
 #define   MI_END_SCENE		(1 << 4) /* flush binner and incr scene count */
+#define   MI_INVALIDATE_ISP	(1 << 5) /* invalidate indirect state pointers */
 #define MI_BATCH_BUFFER_END	MI_INSTR(0x0a, 0)
 #define MI_REPORT_HEAD		MI_INSTR(0x07, 0)
 #define MI_OVERLAY_FLIP		MI_INSTR(0x11,0)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index cea4f1a..1530698 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -515,7 +515,16 @@ render_ring_dispatch_gem_execbuffer(struct drm_device *dev,
 		intel_ring_advance(dev, ring);
 	}
 
+	if (IS_G4X(dev) || IS_IRONLAKE(dev)) {
+		intel_ring_begin(dev, ring, 2);
+		intel_ring_emit(dev, ring, MI_FLUSH |
+				MI_NO_WRITE_FLUSH |
+				MI_INVALIDATE_ISP );
+		intel_ring_emit(dev, ring, MI_NOOP);
+		intel_ring_advance(dev, ring);
+	}
 	/* XXX breadcrumb */
+
 	return 0;
 }
 
-- 
1.7.1