linux-kernel - [PATCH v11 11/11] drm/mediatek: mtk_hdmi_common: Defer probe when ddc i2c bus isn't available yet

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Message-Id: <20251023-mediatek-drm-hdmi-v2-v11-11-7873ec4a1edf@collabora.com>
Date: Thu, 23 Oct 2025 12:32:37 +0200
From: Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 CK Hu <ck.hu@...iatek.com>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org, 
 linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, Sjoerd Simons <sjoerd@...labora.com>, 
 Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
Subject: [PATCH v11 11/11] drm/mediatek: mtk_hdmi_common: Defer probe when
 ddc i2c bus isn't available yet

From: Sjoerd Simons <sjoerd@...labora.com>

The i2c adapter for ddc might not be available yet due to e.g. its
module not yet being loaded. To handle that defer probing rather then
returning a fatal error when probing.

Signed-off-by: Sjoerd Simons <sjoerd@...labora.com>
Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
index 9cd7add3dd949e2920c876f7bcf990350c42d215..73b1c012aaa8a27168867c515e1d006c88dfff54 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
@@ -319,7 +319,7 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi, struct platform_device
 	hdmi->ddc_adpt = of_find_i2c_adapter_by_node(i2c_np);
 	of_node_put(i2c_np);
 	if (!hdmi->ddc_adpt)
-		return dev_err_probe(dev, -EINVAL, "Failed to get ddc i2c adapter by node\n");
+		return dev_err_probe(dev, -EPROBE_DEFER, "Failed to get ddc i2c adapter by node\n");
 
 	ret = mtk_hdmi_get_cec_dev(hdmi, dev, np);
 	if (ret == -ENOTSUPP)

-- 
2.51.0