drm: cirrus: 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/1476744081-24485-8-git-send-email-laurent.pinchart@ideasonboard.com

drivers/gpu/drm/cirrus/cirrus_fbdev.c

@@ -138,12 +138,12 @@ static int cirrusfb_create_object(struct cirrus_fbdev *afbdev,
 {
 	struct drm_device *dev = afbdev->helper.dev;
 	struct cirrus_device *cdev = dev->dev_private;
-	u32 bpp, depth;
+	u32 bpp;
 	u32 size;
 	struct drm_gem_object *gobj;
-
 	int ret = 0;
-	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
+
+	bpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0) * 8;
 
 	if (!cirrus_check_framebuffer(cdev, mode_cmd->width, mode_cmd->height,
 				      bpp, mode_cmd->pitches[0]))

drivers/gpu/drm/cirrus/cirrus_main.c

@@ -52,10 +52,10 @@ cirrus_user_framebuffer_create(struct drm_device *dev,
 	struct cirrus_device *cdev = dev->dev_private;
 	struct drm_gem_object *obj;
 	struct cirrus_framebuffer *cirrus_fb;
+	u32 bpp;
 	int ret;
-	u32 bpp, depth;
 
-	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
+	bpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0) * 8;
 
 	if (!cirrus_check_framebuffer(cdev, mode_cmd->width, mode_cmd->height,
 				      bpp, mode_cmd->pitches[0]))