linux-kernel - Re: [PATCH v10 08/21] drm/mediatek: dpi: implement a swap

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Date:   Mon, 13 Jun 2022 11:12:33 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>,
        Guillaume Ranquet <granquet@...libre.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.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>, "Helge Deller" <deller@....de>,
        Jitao shi <jitao.shi@...iatek.com>
CC:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-phy@...ts.infradead.org>, <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH v10 08/21] drm/mediatek: dpi: implement a swap_input
 toggle in SoC config

On Mon, 2022-05-30 at 15:50 +0800, CK Hu wrote:
> Hi, Guillaume:
> 
> 
> On Mon, 2022-05-23 at 12:47 +0200, Guillaume Ranquet wrote:
> > Adds a bit of flexibility to support SoCs without swap_input
> > support
> > 
> > Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> > Reviewed-by: AngeloGioacchino Del Regno <
> > angelogioacchino.delregno@...labora.com>
> > Reviewed-by: Rex-BC Chen <rex-bc.chen@...iatek.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 545a1337cc89..454f8563efae 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);
> 
> As [1], please keep in touch with Mediatek engineer.
> 
> Regards,
> CK
> 
> [1] 
> 
https://patchwork.kernel.org/project/linux-mediatek/patch/20220218145437.18563-8-granquet@baylibre.com/
> 

Hello CK,

the reason is the hardware design of dp_intf does not support input
swap.
I will add this in commit message.

BRs,
Bo-Chen

> >  		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,
> >  };
> >  
> 
>