drm/vmwgfx: Improve on hibernation

Make it possible to hibernate also with masters that don't switch VT at
hibernation time. We save and restore modesetting state unless fbdev is
active and enabled at hibernation time.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>

1 files changed, 25 insertions, 10 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
index fb4e59ee26c7..e85c1868ef12 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
@@ -161,10 +161,17 @@ static int vmw_fb_blank(int blank, struct fb_info *info)
 	return 0;
 }
 
-/*
- * Dirty code
+/**
+ * vmw_fb_dirty_flush - flush dirty regions to the kms framebuffer
+ *
+ * @work: The struct work_struct associated with this task.
+ *
+ * This function flushes the dirty regions of the vmalloc framebuffer to the
+ * kms framebuffer, and if the kms framebuffer is visible, also updated the
+ * corresponding displays. Note that this function runs even if the kms
+ * framebuffer is not bound to a crtc and thus not visible, but it's turned
+ * off during hibernation using the par->dirty.active bool.
  */
-
 static void vmw_fb_dirty_flush(struct work_struct *work)
 {
 	struct vmw_fb_par *par = container_of(work, struct vmw_fb_par,
@@ -852,12 +859,6 @@ int vmw_fb_off(struct vmw_private *vmw_priv)
 	flush_delayed_work(&info->deferred_work);
 	flush_delayed_work(&par->local_work);
 
-	mutex_lock(&par->bo_mutex);
-	drm_modeset_lock_all(vmw_priv->dev);
-	(void) vmw_fb_kms_detach(par, true, false);
-	drm_modeset_unlock_all(vmw_priv->dev);
-	mutex_unlock(&par->bo_mutex);
-
 	return 0;
 }
 
@@ -873,10 +874,24 @@ int vmw_fb_on(struct vmw_private *vmw_priv)
 	info = vmw_priv->fb_info;
 	par = info->par;
 
-	vmw_fb_set_par(info);
 	spin_lock_irqsave(&par->dirty.lock, flags);
 	par->dirty.active = true;
 	spin_unlock_irqrestore(&par->dirty.lock, flags);
  
 	return 0;
 }
+
+/**
+ * vmw_fb_refresh - Refresh fb display
+ *
+ * @vmw_priv: Pointer to device private
+ *
+ * Call into kms to show the fbdev display(s).
+ */
+void vmw_fb_refresh(struct vmw_private *vmw_priv)
+{
+	if (!vmw_priv->fb_info)
+		return;
+
+	vmw_fb_set_par(vmw_priv->fb_info);
+}