msm: board: remove writeback memory from framebuffer

The memory is allocated on the driver side, board side allocation is
not needed any more.

Change-Id: Id675e5f8420aa82b904d057be0818ed017509869
Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>
diff --git a/arch/arm/mach-msm/board-8930-display.c b/arch/arm/mach-msm/board-8930-display.c
index 2e6718d..c1b880c 100644
--- a/arch/arm/mach-msm/board-8930-display.c
+++ b/arch/arm/mach-msm/board-8930-display.c
@@ -47,23 +47,12 @@
 #define MSM_FB_EXT_BUF_SIZE	0
 #endif
 
-#ifdef CONFIG_FB_MSM_OVERLAY_WRITEBACK
-/* width x height x 3 bpp x 2 frame buffer */
-#define MSM_FB_WRITEBACK_SIZE (1376 * 768 * 3 * 2)
-#define MSM_FB_WRITEBACK_OFFSET  \
-		(MSM_FB_PRIM_BUF_SIZE + MSM_FB_EXT_BUF_SIZE)
-#else
-#define MSM_FB_WRITEBACK_SIZE   0
-#define MSM_FB_WRITEBACK_OFFSET 0
-#endif
-
 #ifdef CONFIG_FB_MSM_HDMI_AS_PRIMARY
 /* 4 bpp x 2 page HDMI case */
 #define MSM_FB_SIZE roundup((1920 * 1088 * 4 * 2), 4096)
 #else
 /* Note: must be multiple of 4096 */
-#define MSM_FB_SIZE roundup(MSM_FB_PRIM_BUF_SIZE + MSM_FB_EXT_BUF_SIZE + \
-				MSM_FB_WRITEBACK_SIZE, 4096)
+#define MSM_FB_SIZE roundup(MSM_FB_PRIM_BUF_SIZE + MSM_FB_EXT_BUF_SIZE, 4096)
 #endif
 
 #ifdef CONFIG_FB_MSM_OVERLAY0_WRITEBACK
@@ -90,11 +79,6 @@
 #define HDMI_PANEL_NAME	"hdmi_msm"
 #define TVOUT_PANEL_NAME	"tvout_msm"
 
-static int writeback_offset(void)
-{
-	return MSM_FB_WRITEBACK_OFFSET;
-}
-
 static struct resource msm_fb_resources[] = {
 	{
 		.flags = IORESOURCE_DMA,
@@ -451,7 +435,6 @@
 	.mdp_bus_scale_table = &mdp_bus_scale_pdata,
 #endif
 	.mdp_rev = MDP_REV_42,
-	.writeback_offset = writeback_offset,
 	.mdp_writeback_memtype = MEMTYPE_EBI1,
 	.mdp_writeback_phys = NULL,
 };