drm/i915/gvt: Fix pipe A enable as default for vgpu

observed igt drv_module_reload test case failure on 4.15.0
rc2 kernel with panic due to no active pipe available.

the gpu will reset during unload/load and make pipe config reg
lost which can cause kernel panic issue happen.

this patch is to move pipe enabling to emulate_mointor_status_chagne
to handle vgpu reset case as well.

Fixes: 7e6059020894 ("drm/i915/gvt: enabled pipe A default on creating vgpu")
Signed-off-by: Xiaolin Zhang <xiaolin.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/gvt/display.c b/drivers/gpu/drm/i915/gvt/display.c
index 355120865efd..309f3fa6794a 100644
--- a/drivers/gpu/drm/i915/gvt/display.c
+++ b/drivers/gpu/drm/i915/gvt/display.c
@@ -266,6 +266,8 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
         /* Clear host CRT status, so guest couldn't detect this host CRT. */
         if (IS_BROADWELL(dev_priv))
                 vgpu_vreg(vgpu, PCH_ADPA) &= ~ADPA_CRT_HOTPLUG_MONITOR_MASK;
+
+        vgpu_vreg(vgpu, PIPECONF(PIPE_A)) |= PIPECONF_ENABLE;
 }
 
 static void clean_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num)
@@ -282,7 +284,6 @@ static void clean_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num)
 static int setup_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num,
                                     int type, unsigned int resolution)
 {
-        struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
         struct intel_vgpu_port *port = intel_vgpu_port(vgpu, port_num);
 
         if (WARN_ON(resolution >= GVT_EDID_NUM))
@@ -308,7 +309,7 @@ static int setup_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num,
         port->type = type;
 
         emulate_monitor_status_change(vgpu);
-        vgpu_vreg(vgpu, PIPECONF(PIPE_A)) |= PIPECONF_ENABLE;
+
         return 0;
 }