drm/arm: mali-dp: Replace drm_fb_get_bpp_depth() with drm_format_plane_cpp()

The driver doesn't need the color depth, only the number of bits per
pixel. Use the right API.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1476744081-24485-13-git-send-email-laurent.pinchart@ideasonboard.com

drivers/gpu/drm/arm/malidp_hw.c

@@ -198,9 +198,6 @@ static void malidp500_modeset(struct malidp_hw_device *hwdev, struct videomode *
 
 static int malidp500_rotmem_required(struct malidp_hw_device *hwdev, u16 w, u16 h, u32 fmt)
 {
-	unsigned int depth;
-	int bpp;
-
 	/* RGB888 or BGR888 can't be rotated */
 	if ((fmt == DRM_FORMAT_RGB888) || (fmt == DRM_FORMAT_BGR888))
 		return -EINVAL;
@@ -210,9 +207,7 @@ static int malidp500_rotmem_required(struct malidp_hw_device *hwdev, u16 w, u16
 	 * worth of pixel data. Required size is then:
 	 *    size = rotated_width * (bpp / 8) * 8;
 	 */
-	drm_fb_get_bpp_depth(fmt, &depth, &bpp);
-
-	return w * bpp;
+	return w * drm_format_plane_cpp(fmt, 0) * 8;
 }
 
 static int malidp550_query_hw(struct malidp_hw_device *hwdev)