Revert "drm/rockchip: framebuffer: Add support /dev/graphics/fb0 read"

This reverts commit 726122d.

Change-Id: If6c3dfa6563129142af19199d02187a38408148c

Author: BrossKuo

drivers/gpu/drm/rockchip/rockchip_drm_fb.c

@@ -100,8 +100,6 @@ rockchip_fb_alloc(struct drm_device *dev, struct drm_mode_fb_cmd2 *mode_cmd,
 {
 	struct rockchip_drm_fb *rockchip_fb;
 	struct rockchip_gem_object *rk_obj;
-	struct rockchip_drm_private *private = dev->dev_private;
-	struct drm_fb_helper *fb_helper = private->fbdev_helper;
 	int ret = 0;
 	int i;
 
@@ -127,9 +125,6 @@ rockchip_fb_alloc(struct drm_device *dev, struct drm_mode_fb_cmd2 *mode_cmd,
 			rk_obj = to_rockchip_obj(obj[i]);
 			rockchip_fb->dma_addr[i] = rk_obj->dma_addr;
 			rockchip_fb->kvaddr[i] = rk_obj->kvaddr;
-			private->fbdev_bo = &rk_obj->base;
-			if (fb_helper && fb_helper->fbdev && rk_obj->kvaddr)
-				fb_helper->fbdev->screen_base = rk_obj->kvaddr;
 		}
 #ifndef MODULE
 	} else if (logo) {

drivers/gpu/drm/rockchip/rockchip_drm_fbdev.c

@@ -69,8 +69,6 @@ static struct fb_ops rockchip_drm_fbdev_ops = {
 	.fb_set_par	= drm_fb_helper_set_par,
 	.fb_blank	= rockchip_fbdev_blank,
 	.fb_pan_display	= drm_fb_helper_pan_display,
-	.fb_read	= drm_fb_helper_sys_read,
-	.fb_write	= drm_fb_helper_sys_write,
 	.fb_setcmap	= drm_fb_helper_setcmap,
 	.fb_dmabuf_export	= rockchip_fbdev_get_dma_buf,
 };