linux-kernel - Re: [PATCH 3/4] drm/mediatek: mtk_dpi: Switch to devm_drm_of_get

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Date:   Thu, 13 Jul 2023 16:24:07 +0800
From:   Fei Shao <fshao@...omium.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     chunkuang.hu@...nel.org, p.zabel@...gutronix.de, airlied@...il.com,
        daniel@...ll.ch, matthias.bgg@...il.com,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH 3/4] drm/mediatek: mtk_dpi: Switch to devm_drm_of_get_bridge()

Hi Angelo,

On Wed, Apr 12, 2023 at 7:53 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Function drm_of_find_panel_or_bridge() is marked as deprecated: since
> the usage of that in this driver exactly corresponds to the new function
> devm_drm_of_get_bridge(), switch to it.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 6be65ea21f8f..9025111013d3 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -1063,10 +1063,9 @@ static int mtk_dpi_probe(struct platform_device *pdev)
>         if (dpi->irq <= 0)
>                 return -EINVAL;
>
> -       ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> -                                         NULL, &dpi->next_bridge);
> -       if (ret)
> -               return ret;
> +       dpi->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, 0);
> +       if (IS_ERR(dpi->next_bridge))
> +               return PTR_ERR(dpi->next_bridge);

The original code doesn't print any log so it's probably fine, but
given you're already at it, perhaps you want to also make use of
dev_err_probe() here?
devm_drm_of_get_bridge() can also pass -EPROBE_DEFER from its wrapped
drm_of_find_panel_or_bridge(). Furthermore, that will make the code
visually align with your previous patch.

But that's just optional, and since this patch works anyway,

Reviewed-by: Fei Shao <fshao@...omium.org>

>
>         dev_info(dev, "Found bridge node: %pOF\n", dpi->next_bridge->of_node);
>
> --
> 2.40.0
>
>