linux-kernel - Re: [PATCH 3/3] drm/mediatek: dp: Fix warning in mtk_dp_video

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Date:   Thu, 15 Sep 2022 18:00:12 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Bo-Chen Chen <rex-bc.chen@...iatek.com>, chunkuang.hu@...nel.org,
        p.zabel@...gutronix.de, airlied@...ux.ie
Cc:     granquet@...libre.com, daniel@...ll.ch, jitao.shi@...iatek.com,
        angelogioacchino.delregno@...labora.com, ck.hu@...iatek.com,
        liangxu.xu@...iatek.com, dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH 3/3] drm/mediatek: dp: Fix warning in mtk_dp_video_mute()



On 15/09/2022 09:50, Bo-Chen Chen wrote:
> Warning:
> ../drivers/gpu/drm/mediatek/mtk_dp.c: In function ‘mtk_dp_video_mute’:
> ../drivers/gpu/drm/mediatek/mtk_dp.c:947:23: warning: format ‘%x’
> expects argument of type ‘unsigned int’, but argument 4 has type ‘long
> unsigned int’ [-Wformat=]
>    947 |  dev_dbg(mtk_dp->dev, "smc cmd: 0x%x, p1: 0x%x, ret: 0x%lx-0x%lx\n",
>        |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ../include/linux/dev_printk.h:129:27: note: in definition of macro ‘dev_printk’
>    129 |   _dev_printk(level, dev, fmt, ##__VA_ARGS__);  \
>        |                           ^~~
> ../include/linux/dev_printk.h:163:31: note: in expansion of macro ‘dev_fmt’
>    163 |   dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
>        |                               ^~~~~~~
> ../drivers/gpu/drm/mediatek/mtk_dp.c:947:2: note: in expansion of
> macro ‘dev_dbg’
>    947 |  dev_dbg(mtk_dp->dev, "smc cmd: 0x%x, p1: 0x%x, ret: 0x%lx-0x%lx\n",
>        |  ^~~~~~~
> ../drivers/gpu/drm/mediatek/mtk_dp.c:947:36: note: format string is defined here
>    947 |  dev_dbg(mtk_dp->dev, "smc cmd: 0x%x, p1: 0x%x, ret: 0x%lx-0x%lx\n",
>        |                                   ~^
>        |                                    |
>        |                                    unsigned int
>        |                                   %lx
> 
> To fix this issue, we use %s to replace 0x%x.
> 
> Reported-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>

Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

> ---
>   drivers/gpu/drm/mediatek/mtk_dp.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
> index c72c646e25e9..d58e98b2f83a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dp.c
> @@ -1222,8 +1222,8 @@ static void mtk_dp_video_mute(struct mtk_dp *mtk_dp, bool enable)
>   		      mtk_dp->data->smc_cmd, enable,
>   		      0, 0, 0, 0, 0, &res);
>   
> -	dev_dbg(mtk_dp->dev, "smc cmd: 0x%x, p1: 0x%x, ret: 0x%lx-0x%lx\n",
> -		mtk_dp->data->smc_cmd, enable, res.a0, res.a1);
> +	dev_dbg(mtk_dp->dev, "smc cmd: 0x%x, p1: %s, ret: 0x%lx-0x%lx\n",
> +		mtk_dp->data->smc_cmd, enable ? "enable" : "disable", res.a0, res.a1);
>   }
>   
>   static void mtk_dp_audio_mute(struct mtk_dp *mtk_dp, bool mute)