[PATCH]drm/i915/gvt: Disable primary/sprite/cursor plane at vdisplay initialization

[Xiong Zhang]

Many error exist in host dmesg during guest boot up with loca display
enabled.
gvt: vgpu 1: invalid range gmadr 0x0 size 0x0
gvt: vgpu 1: invalid gma address: 0

This error happens when qemu get dmabuf info where the vdisplay plane 
is enabled but its base address is a invalid 0, this status may be true 
before guest enable its plane. At this moment, its state is copied from 
host where the plane may be enabled.

This patch disable primary/sprite/cursor plane at vdisplay
initialization to remove the above error.

Signed-off-by: Xiong Zhang <xiong.y.zhang at intel.com>
---
 drivers/gpu/drm/i915/gvt/display.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/display.c b/drivers/gpu/drm/i915/gvt/display.c
index dd96ffc..6d8180e 100644
--- a/drivers/gpu/drm/i915/gvt/display.c
+++ b/drivers/gpu/drm/i915/gvt/display.c
@@ -169,6 +169,8 @@ static u8 dpcd_fix_data[DPCD_HEADER_SIZE] = {
 static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
 {
 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
+	int pipe;
+
 	vgpu_vreg_t(vgpu, SDEISR) &= ~(SDE_PORTB_HOTPLUG_CPT |
 			SDE_PORTC_HOTPLUG_CPT |
 			SDE_PORTD_HOTPLUG_CPT);
@@ -267,6 +269,14 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
 	if (IS_BROADWELL(dev_priv))
 		vgpu_vreg_t(vgpu, PCH_ADPA) &= ~ADPA_CRT_HOTPLUG_MONITOR_MASK;
 
+	/* Disable Primary/Sprite/Cursor plane */
+	for_each_pipe(dev_priv, pipe) {
+		vgpu_vreg_t(vgpu, DSPCNTR(pipe)) &= ~DISPLAY_PLANE_ENABLE;
+		vgpu_vreg_t(vgpu, SPRCTL(pipe)) &= ~SPRITE_ENABLE;
+		vgpu_vreg_t(vgpu, CURCNTR(pipe)) &= ~CURSOR_MODE;
+		vgpu_vreg_t(vgpu, CURCNTR(pipe)) |= CURSOR_MODE_DISABLE;
+	}
+
 	vgpu_vreg_t(vgpu, PIPECONF(PIPE_A)) |= PIPECONF_ENABLE;
 }
 
-- 
2.7.4