drm: pin new and unpin old buffer when setting a mode.

This removes the requirement for user space to pin a buffer before
setting a mode that is backed by the pixels from that buffer.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 6 insertions, 3 deletions

diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h
index a341828d1d15..4bc04cf460a7 100644
--- a/include/drm/drm_crtc_helper.h
+++ b/include/drm/drm_crtc_helper.h
@@ -55,10 +55,12 @@ struct drm_crtc_helper_funcs {
                            struct drm_display_mode *adjusted_mode);
         /* Actually set the mode */
         void (*mode_set)(struct drm_crtc *crtc, struct drm_display_mode *mode,
-                         struct drm_display_mode *adjusted_mode, int x, int y);
+                         struct drm_display_mode *adjusted_mode, int x, int y,
+                         struct drm_framebuffer *old_fb);
 
         /* Move the crtc on the current fb to the given position *optional* */
-        void (*mode_set_base)(struct drm_crtc *crtc, int x, int y);
+        void (*mode_set_base)(struct drm_crtc *crtc, int x, int y,
+                              struct drm_framebuffer *old_fb);
 };
 
 struct drm_encoder_helper_funcs {
@@ -93,7 +95,8 @@ extern bool drm_helper_initial_config(struct drm_device *dev, bool can_grow);
 extern int drm_crtc_helper_set_config(struct drm_mode_set *set);
 extern bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
                                      struct drm_display_mode *mode,
-                                     int x, int y);
+                                     int x, int y,
+                                     struct drm_framebuffer *old_fb);
 extern bool drm_helper_crtc_in_use(struct drm_crtc *crtc);
 
 extern int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,