linux-kernel - Re: [PATCH v8 07/19] drm/mediatek: dpi: implement a swap

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Date:   Fri, 25 Feb 2022 02:55:41 -0800
From:   Guillaume Ranquet <granquet@...libre.com>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, deller@....de,
        CK Hu <ck.hu@...iatek.com>, Jitao Shi <jitao.shi@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        "ARM/Mediatek SoC support" <linux-mediatek@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-phy@...ts.infradead.org, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v8 07/19] drm/mediatek: dpi: implement a swap_input toggle
 in board config

Quoting Chun-Kuang Hu (2022-02-21 03:32:32)
> Hi, Guillaume:
>
> Guillaume Ranquet <granquet@...libre.com> 於 2022年2月18日 週五 下午10:56寫道：
> >
> > Adds a bit of flexibility to support boards without swap_input support
> >
> > Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_dpi.c | 14 +++++++++++---
> >  1 file changed, 11 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > index 545a1337cc899..454f8563efae4 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > @@ -126,6 +126,7 @@ struct mtk_dpi_conf {
> >         const u32 *output_fmts;
> >         u32 num_output_fmts;
> >         bool is_ck_de_pol;
> > +       bool swap_input_support;
> >         const struct mtk_dpi_yc_limit *limit;
> >  };
> >
> > @@ -378,18 +379,21 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
> >             (format == MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL)) {
> >                 mtk_dpi_config_yuv422_enable(dpi, false);
> >                 mtk_dpi_config_csc_enable(dpi, true);
> > -               mtk_dpi_config_swap_input(dpi, false);
> > +               if (dpi->conf->swap_input_support)
> > +                       mtk_dpi_config_swap_input(dpi, false);
> >                 mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_BGR);
> >         } else if ((format == MTK_DPI_COLOR_FORMAT_YCBCR_422) ||
> >                    (format == MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL)) {
> >                 mtk_dpi_config_yuv422_enable(dpi, true);
> >                 mtk_dpi_config_csc_enable(dpi, true);
> > -               mtk_dpi_config_swap_input(dpi, true);
> > +               if (dpi->conf->swap_input_support)
> > +                       mtk_dpi_config_swap_input(dpi, true);
>
> In MT8173, MT2701, MT8183, MT8192, YCBCR_444 would not swap but
> YCBCR_422 would swap. But In MT8195, both YCBCR_444 and YCBCR_422
> would not swap, So I think one of these format would be abnormal in
> MT8195, right? Or would you provide more information about how this
> swap work?
>
> Regards,
> Chun-Kuang.
>

I'm not sure I have access to that level of information... and my
knowledge on mediatek
SoC is rather limited, I will circle back with mediatek engineers to
have a definite
answer.

Thx,
Guillaume
> >                 mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
> >         } else {
> >                 mtk_dpi_config_yuv422_enable(dpi, false);
> >                 mtk_dpi_config_csc_enable(dpi, false);
> > -               mtk_dpi_config_swap_input(dpi, false);
> > +               if (dpi->conf->swap_input_support)
> > +                       mtk_dpi_config_swap_input(dpi, false);
> >                 mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
> >         }
> >  }
> > @@ -808,6 +812,7 @@ static const struct mtk_dpi_conf mt8173_conf = {
> >         .output_fmts = mt8173_output_fmts,
> >         .num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
> >         .is_ck_de_pol = true,
> > +       .swap_input_support = true,
> >         .limit = &mtk_dpi_limit,
> >  };
> >
> > @@ -819,6 +824,7 @@ static const struct mtk_dpi_conf mt2701_conf = {
> >         .output_fmts = mt8173_output_fmts,
> >         .num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
> >         .is_ck_de_pol = true,
> > +       .swap_input_support = true,
> >         .limit = &mtk_dpi_limit,
> >  };
> >
> > @@ -829,6 +835,7 @@ static const struct mtk_dpi_conf mt8183_conf = {
> >         .output_fmts = mt8183_output_fmts,
> >         .num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
> >         .is_ck_de_pol = true,
> > +       .swap_input_support = true,
> >         .limit = &mtk_dpi_limit,
> >  };
> >
> > @@ -839,6 +846,7 @@ static const struct mtk_dpi_conf mt8192_conf = {
> >         .output_fmts = mt8173_output_fmts,
> >         .num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
> >         .is_ck_de_pol = true,
> > +       .swap_input_support = true,
> >         .limit = &mtk_dpi_limit,
> >  };
> >
> > --
> > 2.34.1
> >