Hi, Bibby:
On Fri, 2018-09-21 at 11:28 +0800, Bibby Hsieh wrote:
> From: chunhui dai
>
> Convert dpi driver to use drm_of_find_panel_or_bridge.
> This changes some error messages to debug messages (in the graph core).
> Graph connections are often "no connects" depending on the particular
> board, so we want to avoid spurious messages. Plus the kernel is not a
> DT validator.
> related links:
> [1] https://lkml.org/lkml/2017/2/3/716
> [2] https://lkml.org/lkml/2017/2/3/719
>
> Signed-off-by: chunhui dai
> ---
> drivers/gpu/drm/mediatek/mtk_dpi.c | 18 --
> 1 file changed, 8 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 022ccec49cea..7a4868a0afec 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -14,6 +14,7 @@
> #include
> #include
> #include
> +#include
> #include
> #include
> #include
> @@ -697,7 +698,6 @@ static int mtk_dpi_probe(struct platform_device *pdev)
> struct device *dev = >dev;
> struct mtk_dpi *dpi;
> struct resource *mem;
> - struct device_node *bridge_node;
> int comp_id;
> int ret;
>
> @@ -743,16 +743,14 @@ static int mtk_dpi_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - bridge_node = of_graph_get_remote_node(dev->of_node, 0, 0);
> - if (!bridge_node)
> - return -ENODEV;
> -
> - dev_info(dev, "Found bridge node: %pOF\n", bridge_node);
> -
> - dpi->bridge = of_drm_find_bridge(bridge_node);
> - of_node_put(bridge_node);
> - if (!dpi->bridge)
> + ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> + NULL, >bridge);
> + if (ret) {
> + dev_err(dev, "Failed to find panel or bridge: %d\n", ret);
> return -EPROBE_DEFER;
I've traced into drm_of_find_panel_or_bridge(), it may return -ENODEV
when device tree has error, why do you treat this error to
-EPROBE_DEFER? I think you may modify this as
if (ret)
return ret;
Regards,
CK
> + }
> +
> + dev_info(dev, "Found bridge node: %pOF\n", dpi->bridge->of_node);
>
> comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DPI);
> if (comp_id < 0) {
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