From 4f3f1aed4b8040f2a7a55561762470f942be2740 Mon Sep 17 00:00:00 2001
From: Ping Gao <ping.a.gao@intel.com>
Date: Thu, 10 Nov 2016 15:27:20 +0800
Subject: [PATCH] drm/i915/gvt: emulate right behavior for tlb_control

Emulate right behavior for tlb_control, set to ZERO upon write.

Signed-off-by: Ping Gao <ping.a.gao@intel.com>
Signed-off-by: Min He <min.he@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
---
 drivers/gpu/drm/i915/gvt/handlers.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index 1b3db0c7a6db..8d3389ee0506 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -1372,6 +1372,7 @@ static int gvt_reg_tlb_control_handler(struct intel_vgpu *vgpu,
 	unsigned int id = 0;
 
 	write_vreg(vgpu, offset, p_data, bytes);
+	vgpu_vreg(vgpu, offset) = 0;
 
 	switch (offset) {
 	case 0x4260:
-- 
2.30.9