Revert "bcm2708_fb: Hack out dma support"

This reverts commit d60956f.

drivers/video/fbdev/bcm2708_fb.c

@@ -657,8 +657,6 @@ static long vc_mem_copy(struct bcm2708_fb *fb, struct fb_dmacopy *ioparam)
 	long rc = 0;
 	size_t offset;
 
-return -EFAULT;
-
 	/* restrict this to root user */
 	if (!uid_eq(current_euid(), GLOBAL_ROOT_UID)) {
 		rc = -EFAULT;
@@ -1111,7 +1109,6 @@ static int bcm2708_fb_probe(struct platform_device *dev)
 
 	dev_info(&dev->dev, "FB found %d display(s)\n", num_displays);
 
-#if 0
 	/* Set up the DMA information. Note we have just one set of DMA
 	 * parameters to work with all the FB's so requires synchronising when
 	 * being used
@@ -1144,7 +1141,7 @@ static int bcm2708_fb_probe(struct platform_device *dev)
 			"Failed to request DMA irq\n");
 		goto free_dma_chan;
 	}
-#endif
+
 	rpi_firmware_property(fbdev->fw,
 			      RPI_FIRMWARE_GET_VC_MEMORY,
 			      &gpu_mem, sizeof(gpu_mem));