linux-kernel - Re: [PATCH] drm/mediatek: dpi: Use mt8183 output formats for mt8192

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Date:   Fri, 8 Apr 2022 09:36:17 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     "Nícolas F. R. A. Prado" <nfraprado@...labora.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        <jitao.shi@...iatek.com>, <rex-bc.chen@...iatek.com>
CC:     David Airlie <airlied@...ux.ie>, <linux-kernel@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <kernel@...labora.com>, <linux-arm-kernel@...ts.infradead.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH] drm/mediatek: dpi: Use mt8183 output formats for mt8192

Hi, Jitao & Rex:

Please help to comment on this patch.

On Thu, 2022-04-07 at 21:19 -0400, Nícolas F. R. A. Prado wrote:
> The configuration for mt8192 was incorrectly using the output formats
> from mt8173. Since the output formats for mt8192 are instead the same
> ones as for mt8183, which require two bus samples per pixel, the
> pixelclock and DDR edge setting were misconfigured. This made
> external
> displays unable to show the image.
> 
> Fix the issue by correcting the output format for mt8192 to be the
> same
> as for mt8183, fixing the usage of external displays for mt8192.
> 
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> 
> ---
> 
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 4554e2de1430..e61cd67b978f 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -819,8 +819,8 @@ static const struct mtk_dpi_conf mt8192_conf = {
>  	.cal_factor = mt8183_calculate_factor,
>  	.reg_h_fre_con = 0xe0,
>  	.max_clock_khz = 150000,
> -	.output_fmts = mt8173_output_fmts,
> -	.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
> +	.output_fmts = mt8183_output_fmts,
> +	.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
>  };
>  
>  static int mtk_dpi_probe(struct platform_device *pdev)