a bit cleaner hack to get the display to work in jellybean on Xperia HDPI devices (still not perfect but better) (+ it flickers in recovery instead)

gistfile1.txt

diff --git a/drivers/video/msm/mdp_dma.c b/drivers/video/msm/mdp_dma.c
index 9303d6e..06c212e 100644
--- a/drivers/video/msm/mdp_dma.c
+++ b/drivers/video/msm/mdp_dma.c
@@ -472,14 +472,15 @@ void mdp_set_dma_pan_info(struct fb_info *info, struct mdp_dirty_region *dirty,
                          boolean sync)
 {
        struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)info->par;
+       struct fb_info *fbi = mfd->fbi;
        MDPIBUF *iBuf;
        int bpp = info->var.bits_per_pixel / 8;
 
        down(&mfd->sem);
        iBuf = &mfd->ibuf;
        iBuf->buf = (uint8 *) info->fix.smem_start;
-       iBuf->buf += info->var.xoffset * bpp +
-                       info->var.yoffset * info->fix.line_length;
+
+       iBuf->buf += calc_fb_offset(mfd, fbi, bpp);
 
        iBuf->ibuf_width = info->var.xres_virtual;
        iBuf->bpp = bpp;
diff --git a/drivers/video/msm/msm_fb.c b/drivers/video/msm/msm_fb.c
index 7c81dc4..42a3a17 100644
--- a/drivers/video/msm/msm_fb.c
+++ b/drivers/video/msm/msm_fb.c
@@ -685,6 +685,31 @@ static int msm_fb_blank_sub(int blank_mode, struct fb_info *info,
        return ret;
 }
 
+int calc_fb_offset(struct msm_fb_data_type *mfd, struct fb_info *fbi, int bpp)
+{
+        struct msm_panel_info *panel_info = &mfd->panel_info;
+        int remainder, yres, offset;
+
+        yres = panel_info->yres;
+        remainder = (fbi->fix.line_length*yres) & (PAGE_SIZE - 1);
+
+        if (!remainder)
+                remainder = PAGE_SIZE;
+
+        if (fbi->var.yoffset < yres) {
+                offset = (fbi->var.xoffset * bpp);
+                                /* iBuf->buf += fbi->var.xoffset * bpp + 0 *
+                                yres * fbi->fix.line_length; */
+        } else if (fbi->var.yoffset >= yres && fbi->var.yoffset < 2 * yres) {
+                offset = (fbi->var.xoffset * bpp + yres *
+                fbi->fix.line_length + PAGE_SIZE - remainder);
+        } else {
+                offset = (fbi->var.xoffset * bpp + 2 * yres *
+                fbi->fix.line_length + 2 * (PAGE_SIZE - remainder));
+        }
+        return offset;
+}
+
 static void msm_fb_fillrect(struct fb_info *info,
                            const struct fb_fillrect *rect)
 {
diff --git a/drivers/video/msm/msm_fb.h b/drivers/video/msm/msm_fb.h
index 61d1272..2a4db86 100644
--- a/drivers/video/msm/msm_fb.h
+++ b/drivers/video/msm/msm_fb.h
@@ -173,6 +173,8 @@ void msm_fb_add_device(struct platform_device *pdev);
 
 int msm_fb_detect_client(const char *name);
 
+int calc_fb_offset(struct msm_fb_data_type *mfd, struct fb_info *fbi, int bpp);
+
 #ifdef CONFIG_FB_BACKLIGHT
 void msm_fb_config_backlight(struct msm_fb_data_type *mfd);
 #endif