Haven't looked into how to do this properly.
Fixes display initialization on the Acer Chromebook R13.
Reverts mediatek part of ebc9446135671b89c2397f438af45d9cef0d1368
("drm: convert drivers to use drm_of_find_panel_or_bridge")
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@xxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_dsi.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 7e5e24c..fd10cc4 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -1093,6 +1093,7 @@ static int mtk_dsi_probe(struct platform_device *pdev)
{
struct mtk_dsi *dsi;
struct device *dev = &pdev->dev;
+ struct device_node *remote_node, *endpoint;
struct resource *regs;
int irq_num;
int comp_id;
@@ -1105,10 +1106,22 @@ static int mtk_dsi_probe(struct platform_device *pdev)
dsi->host.ops = &mtk_dsi_ops;
dsi->host.dev = dev;
- ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
- &dsi->panel, &dsi->bridge);
- if (ret)
- return ret;
+ endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
+ if (endpoint) {
+ remote_node = of_graph_get_remote_port_parent(endpoint);
+ if (!remote_node) {
+ dev_err(dev, "No panel connected\n");
+ return -ENODEV;
+ }
+
+ dsi->bridge = of_drm_find_bridge(remote_node);
+ dsi->panel = of_drm_find_panel(remote_node);
+ of_node_put(remote_node);
+ if (!dsi->bridge && !dsi->panel) {
+ dev_info(dev, "Waiting for bridge or panel driver\n");
+ return -EPROBE_DEFER;
+ }
+ }
dsi->engine_clk = devm_clk_get(dev, "engine");
if (IS_ERR(dsi->engine_clk)) {
--
2.7.4
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