exynos_drm_fb_dma_addr
dma_addr_t dma_addr = exynos_drm_fb_dma_addr(fb, 0);
val = (unsigned long)exynos_drm_fb_dma_addr(fb, 0);
dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index);
dma_addr = exynos_drm_fb_dma_addr(fb, 0) + offset;
addr = exynos_drm_fb_dma_addr(state->fb, 0);
luma_addr[0] = exynos_drm_fb_dma_addr(fb, 0);
chroma_addr[0] = exynos_drm_fb_dma_addr(fb, 1);
dma_addr = exynos_drm_fb_dma_addr(fb, 0)