linux-kernel - Re: [PATCH v2,2/2] drm: mediatek: Adjust the dpi output format to MT8186

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Message-ID: <20220819184311.4ty3hkzfdrrdg4sd@notapiano>
Date:   Fri, 19 Aug 2022 14:43:11 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     xinlei.lee@...iatek.com
Cc:     chunkuang.hu@...nel.org, p.zabel@...gutronix.de, airlied@...ux.ie,
        daniel@...ll.ch, matthias.bgg@...il.com,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Jitao Shi <jitao.shi@...iatek.com>
Subject: Re: [PATCH v2,2/2] drm: mediatek: Adjust the dpi output format to
 MT8186

Hi Xinlei,

On Fri, Aug 05, 2022 at 05:57:41PM +0800, xinlei.lee@...iatek.com wrote:
> From: Xinlei Lee <xinlei.lee@...iatek.com>
> 
> Dpi output needs to adjust the output format to dual edge for MT8186.

Could you explain a bit more why this is needed? What does this configuration
do? And why is MMSYS involved in a DPI configuration?

Also, is this a configuration specific to MT8186? I enabled the flag on MT8192
just to test and didn't see any difference in behavior.

> 
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>

If Jitao also helped in the writing of this code, then there should also be a
co-developed-by tag for Jitao before the Signed-off-by [1].

[1] https://www.kernel.org/doc/html/latest/process/submitting-patches.html#when-to-use-acked-by-cc-and-co-developed-by

> Signed-off-by: Xinlei Lee <xinlei.lee@...iatek.com>
[..]
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
[..]
> @@ -151,6 +154,7 @@ struct mtk_dpi_conf {
>  	u32 yuv422_en_bit;
>  	u32 csc_enable_bit;
>  	u32 pixels_per_iter;
> +	bool rgb888_dual_enable;

You're missing a description of this property in the struct's comment above:

drivers/gpu/drm/mediatek/mtk_dpi.c:160: warning: Function parameter or member 'rgb888_dual_enable' not described in 'mtk_dpi_conf'

Thanks,
Nícolas