drm/vmwgfx: Break out implicit fb code

[cascardo/linux.git] / drivers / gpu / drm / vmwgfx / vmwgfx_kms.c

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 29bec97..26c2e9e 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -2095,3 +2095,95 @@ int vmw_kms_fbdev_init_data(struct vmw_private *dev_priv,
 
        return 0;
 }
+
+/**
+ * vmw_kms_del_active - unregister a crtc binding to the implicit framebuffer
+ *
+ * @dev_priv: Pointer to a device private struct.
+ * @du: The display unit of the crtc.
+ */
+void vmw_kms_del_active(struct vmw_private *dev_priv,
+                       struct vmw_display_unit *du)
+{
+       lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);
+
+       if (du->active_implicit) {
+               if (--(dev_priv->num_implicit) == 0)
+                       dev_priv->implicit_fb = NULL;
+               du->active_implicit = false;
+       }
+}
+
+/**
+ * vmw_kms_add_active - register a crtc binding to an implicit framebuffer
+ *
+ * @vmw_priv: Pointer to a device private struct.
+ * @du: The display unit of the crtc.
+ * @vfb: The implicit framebuffer
+ *
+ * Registers a binding to an implicit framebuffer.
+ */
+void vmw_kms_add_active(struct vmw_private *dev_priv,
+                       struct vmw_display_unit *du,
+                       struct vmw_framebuffer *vfb)
+{
+       lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);
+
+       WARN_ON_ONCE(!dev_priv->num_implicit && dev_priv->implicit_fb);
+
+       if (!du->active_implicit && du->is_implicit) {
+               dev_priv->implicit_fb = vfb;
+               du->active_implicit = true;
+               dev_priv->num_implicit++;
+       }
+}
+
+/**
+ * vmw_kms_screen_object_flippable - Check whether we can page-flip a crtc.
+ *
+ * @dev_priv: Pointer to device-private struct.
+ * @crtc: The crtc we want to flip.
+ *
+ * Returns true or false depending whether it's OK to flip this crtc
+ * based on the criterion that we must not have more than one implicit
+ * frame-buffer at any one time.
+ */
+bool vmw_kms_crtc_flippable(struct vmw_private *dev_priv,
+                           struct drm_crtc *crtc)
+{
+       struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
+
+       lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);
+
+       if (!du->is_implicit)
+               return true;
+
+       if (dev_priv->num_implicit != 1)
+               return false;
+
+       return true;
+}
+
+/**
+ * vmw_kms_update_implicit_fb - Update the implicit fb.
+ *
+ * @dev_priv: Pointer to device-private struct.
+ * @crtc: The crtc the new implicit frame-buffer is bound to.
+ */
+void vmw_kms_update_implicit_fb(struct vmw_private *dev_priv,
+                               struct drm_crtc *crtc)
+{
+       struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
+       struct vmw_framebuffer *vfb;
+
+       lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);
+
+       if (!du->is_implicit)
+               return;
+
+       vfb = vmw_framebuffer_to_vfb(crtc->primary->fb);
+       WARN_ON_ONCE(dev_priv->num_implicit != 1 &&
+                    dev_priv->implicit_fb != vfb);
+
+       dev_priv->implicit_fb = vfb;
+}