linux-kernel - Re: [PATCH v15 07/16] drm/mediatek: dpi: implement a swap

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Message-ID: <970b3bed67850d113b9af4b3d62eb9029772642e.camel@mediatek.com>
Date:   Tue, 5 Jul 2022 11:51:35 +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>,
        <xinlei.lee@...iatek.com>, <liangxu.xu@...iatek.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 v15 07/16] drm/mediatek: dpi: implement a swap_input
 toggle in SoC config

Hi, Bo-Chen:

On Fri, 2022-07-01 at 11:58 +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.
> We also add a warning message if the hardware is not supported and it
> needs to swap input.

Applied to mediatek-drm-next [1], thanks.

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next

Regards,
CK

> 
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> 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>
> Reviewed-by: CK Hu <ck.hu@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index b89ad9f38396..ba871c347d15 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -121,6 +121,7 @@ struct mtk_dpi_yc_limit {
>   * @output_fmts: Array of supported output formats.
>   * @num_output_fmts: Quantity of supported output formats.
>   * @is_ck_de_pol: Support CK/DE polarity.
> + * @swap_input_support: Support input swap function.
>   */
>  struct mtk_dpi_conf {
>  	unsigned int (*cal_factor)(int clock);
> @@ -130,6 +131,7 @@ struct mtk_dpi_conf {
>  	const u32 *output_fmts;
>  	u32 num_output_fmts;
>  	bool is_ck_de_pol;
> +	bool swap_input_support;
>  };
>  
>  static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val,
> u32 mask)
> @@ -393,7 +395,8 @@ static void mtk_dpi_config_color_format(struct
> mtk_dpi *dpi,
>  	/* only support RGB888 */
>  	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);
>  }
>  
> @@ -804,6 +807,7 @@ 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,
>  };
>  
>  static const struct mtk_dpi_conf mt2701_conf = {
> @@ -814,6 +818,7 @@ 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,
>  };
>  
>  static const struct mtk_dpi_conf mt8183_conf = {
> @@ -823,6 +828,7 @@ 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,
>  };
>  
>  static const struct mtk_dpi_conf mt8192_conf = {
> @@ -832,6 +838,7 @@ 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,
>  };
>  
>  static int mtk_dpi_probe(struct platform_device *pdev)