diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index 4e0a80467b440b85e7783f09c34b8ac4703ae0f7..772bcd8637418acf1c8cfe530ed971fa58f11ebf 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -1589,6 +1589,14 @@ void r100_gpu_init(struct radeon_device *rdev)
 	r100_hdp_reset(rdev);
 }
 
+void r100_hdp_flush(struct radeon_device *rdev)
+{
+	u32 tmp;
+	tmp = RREG32(RADEON_HOST_PATH_CNTL);
+	tmp |= RADEON_HDP_READ_BUFFER_INVALIDATE;
+	WREG32(RADEON_HOST_PATH_CNTL, tmp);
+}
+
 void r100_hdp_reset(struct radeon_device *rdev)
 {
 	uint32_t tmp;
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 278f646bc18ef7dd0d027499f11b49d898b247fe..797a36f9a0f4f7713083e9ca767c0f9bdaaf9704 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -1101,6 +1101,10 @@ void r600_pciep_wreg(struct radeon_device *rdev, u32 reg, u32 v)
 	(void)RREG32(PCIE_PORT_DATA);
 }
 
+void r600_hdp_flush(struct radeon_device *rdev)
+{
+	WREG32(R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL, 0x1);
+}
 
 /*
  * CP & Ring
diff --git a/drivers/gpu/drm/radeon/r600d.h b/drivers/gpu/drm/radeon/r600d.h
index 27ab428b149bbccc6c077e6a648c991ebaddcd2a..b7f4ce2270bc606f919e41ddbcdd877b9cc14c17 100644
--- a/drivers/gpu/drm/radeon/r600d.h
+++ b/drivers/gpu/drm/radeon/r600d.h
@@ -674,4 +674,5 @@
 #define		S_000E60_SOFT_RESET_TSC(x)		(((x) & 1) << 16)
 #define		S_000E60_SOFT_RESET_VMC(x)		(((x) & 1) << 17)
 
+#define R_005480_HDP_MEM_COHERENCY_FLUSH_CNTL		0x5480
 #endif
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 9cb81a805d144e6a6f12686b883415c1d394a790..c32fe1cec8186599f44322d8e484fb30575e28e7 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -639,6 +639,7 @@ struct radeon_asic {
 			       uint32_t offset, uint32_t obj_size);
 	int (*clear_surface_reg)(struct radeon_device *rdev, int reg);
 	void (*bandwidth_update)(struct radeon_device *rdev);
+	void (*hdp_flush)(struct radeon_device *rdev);
 };
 
 /*
@@ -971,6 +972,7 @@ static inline void radeon_ring_write(struct radeon_device *rdev, uint32_t v)
 #define radeon_set_surface_reg(rdev, r, f, p, o, s) ((rdev)->asic->set_surface_reg((rdev), (r), (f), (p), (o), (s)))
 #define radeon_clear_surface_reg(rdev, r) ((rdev)->asic->clear_surface_reg((rdev), (r)))
 #define radeon_bandwidth_update(rdev) (rdev)->asic->bandwidth_update((rdev))
+#define radeon_hdp_flush(rdev) (rdev)->asic->hdp_flush((rdev))
 
 /* Common functions */
 extern int radeon_gart_table_vram_pin(struct radeon_device *rdev);
diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
index c18fbee387d7c1efb0e6c905fc7550b4a907c45a..c7a7f84fe3ec3e70542c9fd964d5d2366d3cb9b4 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -76,6 +76,7 @@ int r100_clear_surface_reg(struct radeon_device *rdev, int reg);
 void r100_bandwidth_update(struct radeon_device *rdev);
 void r100_ring_ib_execute(struct radeon_device *rdev, struct radeon_ib *ib);
 int r100_ring_test(struct radeon_device *rdev);
+void r100_hdp_flush(struct radeon_device *rdev);
 
 static struct radeon_asic r100_asic = {
 	.init = &r100_init,
@@ -107,6 +108,7 @@ static struct radeon_asic r100_asic = {
 	.set_surface_reg = r100_set_surface_reg,
 	.clear_surface_reg = r100_clear_surface_reg,
 	.bandwidth_update = &r100_bandwidth_update,
+	.hdp_flush = &r100_hdp_flush,
 };
 
 
@@ -162,6 +164,7 @@ static struct radeon_asic r300_asic = {
 	.set_surface_reg = r100_set_surface_reg,
 	.clear_surface_reg = r100_clear_surface_reg,
 	.bandwidth_update = &r100_bandwidth_update,
+	.hdp_flush = &r100_hdp_flush,
 };
 
 /*
@@ -201,6 +204,7 @@ static struct radeon_asic r420_asic = {
 	.set_surface_reg = r100_set_surface_reg,
 	.clear_surface_reg = r100_clear_surface_reg,
 	.bandwidth_update = &r100_bandwidth_update,
+	.hdp_flush = &r100_hdp_flush,
 };
 
 
@@ -245,6 +249,7 @@ static struct radeon_asic rs400_asic = {
 	.set_surface_reg = r100_set_surface_reg,
 	.clear_surface_reg = r100_clear_surface_reg,
 	.bandwidth_update = &r100_bandwidth_update,
+	.hdp_flush = &r100_hdp_flush,
 };
 
 
@@ -291,6 +296,7 @@ static struct radeon_asic rs600_asic = {
 	.set_pcie_lanes = NULL,
 	.set_clock_gating = &radeon_atom_set_clock_gating,
 	.bandwidth_update = &rs600_bandwidth_update,
+	.hdp_flush = &r100_hdp_flush,
 };
 
 
@@ -334,6 +340,7 @@ static struct radeon_asic rs690_asic = {
 	.set_surface_reg = r100_set_surface_reg,
 	.clear_surface_reg = r100_clear_surface_reg,
 	.bandwidth_update = &rs690_bandwidth_update,
+	.hdp_flush = &r100_hdp_flush,
 };
 
 
@@ -381,6 +388,7 @@ static struct radeon_asic rv515_asic = {
 	.set_surface_reg = r100_set_surface_reg,
 	.clear_surface_reg = r100_clear_surface_reg,
 	.bandwidth_update = &rv515_bandwidth_update,
+	.hdp_flush = &r100_hdp_flush,
 };
 
 
@@ -419,6 +427,7 @@ static struct radeon_asic r520_asic = {
 	.set_surface_reg = r100_set_surface_reg,
 	.clear_surface_reg = r100_clear_surface_reg,
 	.bandwidth_update = &rv515_bandwidth_update,
+	.hdp_flush = &r100_hdp_flush,
 };
 
 /*
@@ -455,6 +464,7 @@ int r600_ring_test(struct radeon_device *rdev);
 int r600_copy_blit(struct radeon_device *rdev,
 		   uint64_t src_offset, uint64_t dst_offset,
 		   unsigned num_pages, struct radeon_fence *fence);
+void r600_hdp_flush(struct radeon_device *rdev);
 
 static struct radeon_asic r600_asic = {
 	.init = &r600_init,
@@ -484,6 +494,7 @@ static struct radeon_asic r600_asic = {
 	.set_surface_reg = r600_set_surface_reg,
 	.clear_surface_reg = r600_clear_surface_reg,
 	.bandwidth_update = &rv515_bandwidth_update,
+	.hdp_flush = &r600_hdp_flush,
 };
 
 /*
@@ -523,6 +534,7 @@ static struct radeon_asic rv770_asic = {
 	.set_surface_reg = r600_set_surface_reg,
 	.clear_surface_reg = r600_clear_surface_reg,
 	.bandwidth_update = &rv515_bandwidth_update,
+	.hdp_flush = &r600_hdp_flush,
 };
 
 #endif
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 1f056dadc5c2243339c0562801669bf28a903b1b..98835f51e35e6edf7f286b2db7eedab982f2e075 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -315,6 +315,7 @@ int radeon_object_wait(struct radeon_object *robj)
 	}
 	spin_unlock(&robj->tobj.lock);
 	radeon_object_unreserve(robj);
+	radeon_hdp_flush(robj->rdev);
 	return r;
 }