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

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Message-ID: <20220408014323.k5imykh7btbqc4c2@notapiano>
Date:   Thu, 7 Apr 2022 21:43:23 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     CK Hu <ck.hu@...iatek.com>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        jitao.shi@...iatek.com, rex-bc.chen@...iatek.com,
        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

On Fri, Apr 08, 2022 at 09:36:17AM +0800, CK Hu wrote:
> Hi, Jitao & Rex:
> 
> Please help to comment on this patch.

Hi Chuang,

I already sent a v2 of this patch [1] because I forgot to add the Fixes tag.
Sorry for the noise.

Thanks,
Nícolas

[1] https://lore.kernel.org/all/20220408013950.674477-1-nfraprado@collabora.com/

> 
> 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)
>