In order to enhance human readability, separating the optional
CMDQ mailbox initialization from the rest of the CRTC creation
machinery, move it to a new mtk_drm_cmdq_init() function.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 83 ++++++++++++++-----------
 1 file changed, 48 insertions(+), 35 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 88c63330a421..bff65c8c6a0e 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -826,6 +826,48 @@ struct device *mtk_drm_crtc_dma_dev_get(struct drm_crtc *crtc)
 	return mtk_crtc->dma_dev;
 }
 
+static int mtk_drm_cmdq_init(struct device *dev, struct mtk_drm_private *priv,
+			     struct mtk_drm_crtc *mtk_crtc)
+{
+	int ret;
+
+	mtk_crtc->cmdq_client = cmdq_mbox_create(mtk_crtc->mmsys_dev, priv->mbox_index);
+	if (IS_ERR(mtk_crtc->cmdq_client)) {
+		ret = PTR_ERR(mtk_crtc->cmdq_client);
+		dev_dbg(dev, "Failed to create CMDQ client: %d\n", ret);
+		goto error;
+	}
+
+	/* Setup the CMDQ handler callback */
+	mtk_crtc->cmdq_client->priv = mtk_crtc;
+	mtk_crtc->cmdq_client->client.rx_callback = ddp_cmdq_cb;
+
+	ret = of_property_read_u32_index(priv->mutex_node, "mediatek,gce-events",
+					 priv->mbox_index, &mtk_crtc->cmdq_event);
+	if (ret) {
+		dev_dbg(dev, "Failed to get mediatek,gce-events: %d\n", ret);
+		goto free_mbox;
+	}
+
+	mtk_crtc->cmdq_handle = cmdq_pkt_create(mtk_crtc->cmdq_client, PAGE_SIZE);
+	if (IS_ERR(mtk_crtc->cmdq_handle)) {
+		ret = PTR_ERR(mtk_crtc->cmdq_handle);
+		dev_err(dev, "Failed to create cmdq packet: %d\n", ret);
+		goto free_mbox;
+	}
+
+	/* for sending blocking cmd in crtc disable */
+	init_waitqueue_head(&mtk_crtc->cb_blocking_queue);
+
+	return 0;
+
+free_mbox:
+	cmdq_mbox_destroy(mtk_crtc->cmdq_client);
+error:
+	mtk_crtc->cmdq_client = NULL;
+	return ret;
+}
+
 int mtk_drm_crtc_create(struct drm_device *drm_dev,
 			const unsigned int *path, unsigned int path_len,
 			int priv_data_index)
@@ -942,42 +984,13 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
 	drm_crtc_enable_color_mgmt(&mtk_crtc->base, 0, has_ctm, gamma_lut_size);
 	mutex_init(&mtk_crtc->hw_lock);
 
-	i = priv->mbox_index++;
-
-	mtk_crtc->cmdq_client = cmdq_mbox_create(mtk_crtc->mmsys_dev, i);
-	if (IS_ERR(mtk_crtc->cmdq_client)) {
-		ret = PTR_ERR(mtk_crtc->cmdq_client);
-		dev_dbg(dev, "Failed to create CMDQ client: %d\n", ret);
-		mtk_crtc->cmdq_client = NULL;
-		return 0;
-	}
-
-	/* Setup the CMDQ handler callback */
-	mtk_crtc->cmdq_client->priv = mtk_crtc;
-	mtk_crtc->cmdq_client->client.rx_callback = ddp_cmdq_cb;
+	ret = mtk_drm_cmdq_init(dev, priv, mtk_crtc);
+	if (ret)
+		dev_info(dev, "No CMDQ support for CRTC%d: using CPU writes\n",
+			 drm_crtc_index(&mtk_crtc->base));
 
-	if (mtk_crtc->cmdq_client) {
-		ret = of_property_read_u32_index(priv->mutex_node,
-						 "mediatek,gce-events",
-						 i,
-						 &mtk_crtc->cmdq_event);
-		if (ret) {
-			dev_dbg(dev, "mtk_crtc %d failed to get mediatek,gce-events property\n",
-				drm_crtc_index(&mtk_crtc->base));
-			cmdq_mbox_destroy(mtk_crtc->cmdq_client);
-			mtk_crtc->cmdq_client = NULL;
-		} else {
-			mtk_crtc->cmdq_handle = cmdq_pkt_create(mtk_crtc->cmdq_client, PAGE_SIZE);
-			if (ret) {
-				dev_dbg(dev, "mtk_crtc %d failed to create cmdq packet\n",
-					drm_crtc_index(&mtk_crtc->base));
-				cmdq_mbox_destroy(mtk_crtc->cmdq_client);
-				mtk_crtc->cmdq_client = NULL;
-			}
-		}
+	/* Unconditionally increment mbox_index */
+	priv->mbox_index++;
 
-		/* for sending blocking cmd in crtc disable */
-		init_waitqueue_head(&mtk_crtc->cb_blocking_queue);
-	}
 	return 0;
 }
-- 
2.40.1