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 13:13:30 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Fei Shao <fshao@...omium.org>
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()

Il 13/07/23 10:24, Fei Shao ha scritto:
> 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>
> 

Thanks. Yeah it's a good idea to add an error print... since I will have
to anyway send a v2, I'll add it.

Cheers,
Angelo

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