[PATCH] drm/i915/gvt: add missing display part reset for vGPU reset

[changbin.du at intel.com]

From: Changbin Du <changbin.du at intel.com>

We also need reset vGPU virtual display emulation. Since all vreg has
been cleared, we need reset display related vreg to reflect our display
setting.

Signed-off-by: Changbin Du <changbin.du at intel.com>
Cc: Ping Gao <ping.a.gao at intel.com>
---
 drivers/gpu/drm/i915/gvt/display.c | 12 ++++++++++++
 drivers/gpu/drm/i915/gvt/display.h |  1 +
 drivers/gpu/drm/i915/gvt/vgpu.c    |  1 +
 3 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/display.c b/drivers/gpu/drm/i915/gvt/display.c
index c0c884a..4731dce 100644
--- a/drivers/gpu/drm/i915/gvt/display.c
+++ b/drivers/gpu/drm/i915/gvt/display.c
@@ -328,3 +328,15 @@ int intel_vgpu_init_display(struct intel_vgpu *vgpu)
 	else
 		return setup_virtual_dp_monitor(vgpu, PORT_B, GVT_DP_B);
 }
+
+/**
+ * intel_vgpu_reset_display- reset vGPU virtual display emulation
+ * @vgpu: a vGPU
+ *
+ * This function is used to reset vGPU virtual display emulation stuffs
+ *
+ */
+void intel_vgpu_reset_display(struct intel_vgpu *vgpu)
+{
+	emulate_monitor_status_change(vgpu);
+}
diff --git a/drivers/gpu/drm/i915/gvt/display.h b/drivers/gpu/drm/i915/gvt/display.h
index 7a60cb8..8b234ea 100644
--- a/drivers/gpu/drm/i915/gvt/display.h
+++ b/drivers/gpu/drm/i915/gvt/display.h
@@ -158,6 +158,7 @@ void intel_gvt_emulate_vblank(struct intel_gvt *gvt);
 void intel_gvt_check_vblank_emulation(struct intel_gvt *gvt);
 
 int intel_vgpu_init_display(struct intel_vgpu *vgpu);
+void intel_vgpu_reset_display(struct intel_vgpu *vgpu);
 void intel_vgpu_clean_display(struct intel_vgpu *vgpu);
 
 #endif
diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
index 7295bc8..2c17e07 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -384,6 +384,7 @@ void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
 		intel_vgpu_reset_resource(vgpu);
 		intel_vgpu_reset_mmio(vgpu);
 		populate_pvinfo_page(vgpu);
+		intel_vgpu_reset_display(vgpu);
 
 		if (dmlr)
 			intel_vgpu_reset_cfg_space(vgpu);
-- 
2.7.4