drm/ast: Pin framebuffer BO during dirty update

Another explicit lock operation of a GEM VRAM BO is located in AST's
framebuffer update code. Instead of locking the BO, we pin it to wherever
it is.

v2:
	* update with pin flag of 0

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190613073041.29350-6-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/ast/ast_fb.c b/drivers/gpu/drm/ast/ast_fb.c
index 5480cae..8200b25 100644 (file)
--- a/drivers/gpu/drm/ast/ast_fb.c
+++ b/drivers/gpu/drm/ast/ast_fb.c
@@ -48,30 +48,30 @@ static void ast_dirty_update(struct ast_fbdev *afbdev,
                             int x, int y, int width, int height)
 {
        int i;
-       struct drm_gem_object *obj;
        struct drm_gem_vram_object *gbo;
        int src_offset, dst_offset;
        int bpp = afbdev->afb.base.format->cpp[0];
-       int ret = -EBUSY;
+       int ret;
        u8 *dst;
        bool unmap = false;
        bool store_for_later = false;
        int x2, y2;
        unsigned long flags;
 
-       obj = afbdev->afb.obj;
-       gbo = drm_gem_vram_of_gem(obj);
-
-       /* Try to lock the BO. If we fail with -EBUSY then
-        * the BO is being moved and we should store up the
-        * damage until later.
-        */
-       if (drm_can_sleep())
-               ret = drm_gem_vram_lock(gbo, true);
-       if (ret) {
-               if (ret != -EBUSY)
-                       return;
-
+       gbo = drm_gem_vram_of_gem(afbdev->afb.obj);
+
+       if (drm_can_sleep()) {
+               /* We pin the BO so it won't be moved during the
+                * update. The actual location, video RAM or system
+                * memory, is not important.
+                */
+               ret = drm_gem_vram_pin(gbo, 0);
+               if (ret) {
+                       if (ret != -EBUSY)
+                               return;
+                       store_for_later = true;
+               }
+       } else {
                store_for_later = true;
        }
 
@@ -126,7 +126,7 @@ static void ast_dirty_update(struct ast_fbdev *afbdev,
                drm_gem_vram_kunmap(gbo);
 
 out:
-       drm_gem_vram_unlock(gbo);
+       drm_gem_vram_unpin(gbo);
 }
 
 static void ast_fillrect(struct fb_info *info,