linux-kernel - Re: [PATCH v11 04/12] drm/mediatek: dpi: implement a swap

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Message-ID: <e431cca23add678bb39dbc75d783d239914d256a.camel@mediatek.com>
Date:   Tue, 14 Jun 2022 13:27:36 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Bo-Chen Chen <rex-bc.chen@...iatek.com>, <chunkuang.hu@...nel.org>,
        <p.zabel@...gutronix.de>, <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <matthias.bgg@...il.com>,
        <airlied@...ux.ie>
CC:     <msp@...libre.com>, <granquet@...libre.com>,
        <jitao.shi@...iatek.com>, <wenst@...omium.org>,
        <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>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v11 04/12] drm/mediatek: dpi: implement a swap_input
 toggle in SoC config

Hi, Bo-Chen:

On Mon, 2022-06-13 at 14:48 +0800, Bo-Chen Chen wrote:
> From: Guillaume Ranquet <granquet@...libre.com>
> 
> The hardware design of dp_intf does not support input swap, so we add
> a bit of flexibility to support SoCs without swap_input support.
> 
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> [Bo-Chen: Add modification reason in commit message.]
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.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 15218c1e8c11..c1438c744120 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 this case, we need swap input, but hardware does not support, so
just skip config hardware and everything works fine? Should print any
error message?

Regards,
CK

>  		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 = mt8183_output_fmts,
>  	.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
>  	.is_ck_de_pol = true,
> +	.swap_input_support = true,
>  	.limit = &mtk_dpi_limit,
>  };
>