drm/nv50: send evo "update" command after each disconnect

It turns out that the display engine signals an interrupt for disconnects
too.  In order to make it easier to process the display interrupts
correctly, we want to ensure we only get one operation per interrupt
sequence - this is what this commit achieves.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/gpu/drm/nouveau/nv50_sor.c b/drivers/gpu/drm/nouveau/nv50_sor.c
index 03cb021bf292..6461eaef6ec8 100644
--- a/drivers/gpu/drm/nouveau/nv50_sor.c
+++ b/drivers/gpu/drm/nouveau/nv50_sor.c
@@ -47,16 +47,19 @@ nv50_sor_disconnect(struct drm_encoder *encoder)
 
         if (!nv_encoder->crtc)
                 return;
+        nv50_crtc_blank(nouveau_crtc(nv_encoder->crtc), true);
 
         NV_DEBUG_KMS(dev, "Disconnecting SOR %d\n", nv_encoder->or);
 
-        ret = RING_SPACE(evo, 2);
+        ret = RING_SPACE(evo, 4);
         if (ret) {
                 NV_ERROR(dev, "no space while disconnecting SOR\n");
                 return;
         }
         BEGIN_RING(evo, 0, NV50_EVO_SOR(nv_encoder->or, MODE_CTRL), 1);
-        OUT_RING(evo, 0);
+        OUT_RING  (evo, 0);
+        BEGIN_RING(evo, 0, NV50_EVO_UPDATE, 1);
+        OUT_RING  (evo, 0);
 
         nv_encoder->crtc = NULL;
         nv_encoder->last_dpms = DRM_MODE_DPMS_OFF;