video: Allow drivers to allocate the frame buffer themselves

When plat->base is set by driver then skip frame buffer reservation
and allocation.

Signed-off-by: Pali Rohár <pali@kernel.org>

diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c
index 7d499bcec51d222bbc75668278da2b21756f636e..88797d4a21c2f76c8a7d8a8d5872535f731b277a 100644 (file)
--- a/drivers/video/video-uclass.c
+++ b/drivers/video/video-uclass.c
@@ -33,7 +33,8 @@
  * information represents the requires size and alignment of the frame buffer
  * for the device. The values can be an over-estimate but cannot be too
  * small. The actual values will be suppled (in the same manner) by the bind()
- * method after relocation.
+ * method after relocation. Additionally driver can allocate frame buffer
+ * itself by setting plat->base.
  *
  * This information is then picked up by video_reserve() which works out how
  * much memory is needed for all devices. This is allocated between
@@ -78,6 +79,10 @@ static ulong alloc_fb(struct udevice *dev, ulong *addrp)
        if (!plat->size)
                return 0;
 
+       /* Allow drivers to allocate the frame buffer themselves */
+       if (plat->base)
+               return 0;
+
        align = plat->align ? plat->align : 1 << 20;
        base = *addrp - plat->size;
        base &= ~(align - 1);