gpu: ipu-v3: ipu-dmfc: Make function ipu_dmfc_init_channel() return void

Since the function ipu_dmfc_init_channel() always returns zero, we may
change the return type to void to simplify the code.
Signed-off-by: Liu Ying <gnuiyl@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/gpu/drm/imx/ipuv3-plane.c

@@ -280,11 +280,7 @@ int ipu_plane_mode_set(struct ipu_plane *ipu_plane, struct drm_crtc *crtc,
 		}
 	}
 
-	ret = ipu_dmfc_init_channel(ipu_plane->dmfc, crtc_w);
-	if (ret) {
-		dev_err(dev, "initializing dmfc channel failed with %d\n", ret);
-		return ret;
-	}
+	ipu_dmfc_init_channel(ipu_plane->dmfc, crtc_w);
 
 	ret = ipu_dmfc_alloc_bandwidth(ipu_plane->dmfc,
 			calc_bandwidth(crtc_w, crtc_h,

drivers/gpu/ipu-v3/ipu-dmfc.c

@@ -350,7 +350,7 @@ int ipu_dmfc_alloc_bandwidth(struct dmfc_channel *dmfc,
 }
 EXPORT_SYMBOL_GPL(ipu_dmfc_alloc_bandwidth);
 
-int ipu_dmfc_init_channel(struct dmfc_channel *dmfc, int width)
+void ipu_dmfc_init_channel(struct dmfc_channel *dmfc, int width)
 {
 	struct ipu_dmfc_priv *priv = dmfc->priv;
 	u32 dmfc_gen1;
@@ -367,8 +367,6 @@ int ipu_dmfc_init_channel(struct dmfc_channel *dmfc, int width)
 	writel(dmfc_gen1, priv->base + DMFC_GENERAL1);
 
 	mutex_unlock(&priv->mutex);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(ipu_dmfc_init_channel);
 

include/video/imx-ipu-v3.h

@@ -237,7 +237,7 @@ void ipu_dmfc_disable_channel(struct dmfc_channel *dmfc);
 int ipu_dmfc_alloc_bandwidth(struct dmfc_channel *dmfc,
 		unsigned long bandwidth_mbs, int burstsize);
 void ipu_dmfc_free_bandwidth(struct dmfc_channel *dmfc);
-int ipu_dmfc_init_channel(struct dmfc_channel *dmfc, int width);
+void ipu_dmfc_init_channel(struct dmfc_channel *dmfc, int width);
 struct dmfc_channel *ipu_dmfc_get(struct ipu_soc *ipu, int ipuv3_channel);
 void ipu_dmfc_put(struct dmfc_channel *dmfc);