From 0811fa663015c469510f30e2a0f2fe8fd383b224 Mon Sep 17 00:00:00 2001
From: fred gao <fred.gao@intel.com>
Date: Wed, 24 May 2017 12:02:24 +0800
Subject: [PATCH] drm/i915/gvt: Fix GDRST vreg state after reset
Git-commit: 0811fa663015c469510f30e2a0f2fe8fd383b224
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900
Emulating the GDRST read behavior correctly to ack the
guest reset request.
V2:
- split the original patch into two:
GDRST read handler and virtual gpu reset. (Zhenyu)
V3:
- emulate the GDRST read right after write. (Zhenyu)
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zhang Yulei <yulei.zhang@intel.com>
Signed-off-by: fred gao <fred.gao@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/i915/gvt/handlers.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -298,6 +298,9 @@ static int gdrst_mmio_write(struct intel
intel_gvt_reset_vgpu_locked(vgpu, false, engine_mask);
+ /* sw will wait for the device to ack the reset request */
+ vgpu_vreg(vgpu, offset) = 0;
+
return 0;
}