linux-kernel - [PATCH] drm/mediatek: Only try to attach bridge if there is one

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Date:   Mon, 26 Nov 2018 12:07:37 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     CK Hu <ck.hu@...iatek.com>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/mediatek: Only try to attach bridge if there is one

Even if dsi->bridge is NULL, we still try to call drm_bridge_attach,
and print out an error message, before creating the connector.

When no bridge is provided, let's skip these 2 steps and directly
create the connector.

Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 66df1b17795921..27b507eb4a997d 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -818,10 +818,13 @@ static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi)
 	dsi->encoder.possible_crtcs = 1;
 
 	/* If there's a bridge, attach to it and let it create the connector */
-	ret = drm_bridge_attach(&dsi->encoder, dsi->bridge, NULL);
-	if (ret) {
-		DRM_ERROR("Failed to attach bridge to drm\n");
-
+	if (dsi->bridge) {
+		ret = drm_bridge_attach(&dsi->encoder, dsi->bridge, NULL);
+		if (ret) {
+			DRM_ERROR("Failed to attach bridge to drm\n");
+			goto err_encoder_cleanup;
+		}
+	} else {
 		/* Otherwise create our own connector and attach to a panel */
 		ret = mtk_dsi_create_connector(drm, dsi);
 		if (ret)
-- 
2.20.0.rc0.387.gc7a69e6b6c-goog