linux-kernel - Re: [PATCH v15 06/16] drm/mediatek: dpi: implement a CK/DE pol toggle in SoC config

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Message-ID: <ceadf7dd8f0fe518f5615f9cc69c6f0b47b1b7d8.camel@mediatek.com>
Date:   Tue, 5 Jul 2022 11:50:42 +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 06/16] drm/mediatek: dpi: implement a CK/DE pol
 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>
> 
> Dp_intf does not support CK/DE polarity because the polarity
> information
> is not used for eDP and DP while dp_intf is only for eDP and DP.
> Therefore, we add a bit of flexibility to support SoCs without CK/DE
> pol
> support.

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 | 23 ++++++++++++++++++-----
>  1 file changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 0855bbdfe4e1..b89ad9f38396 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -120,6 +120,7 @@ struct mtk_dpi_yc_limit {
>   * @edge_sel_en: Enable of edge selection.
>   * @output_fmts: Array of supported output formats.
>   * @num_output_fmts: Quantity of supported output formats.
> + * @is_ck_de_pol: Support CK/DE polarity.
>   */
>  struct mtk_dpi_conf {
>  	unsigned int (*cal_factor)(int clock);
> @@ -128,6 +129,7 @@ struct mtk_dpi_conf {
>  	bool edge_sel_en;
>  	const u32 *output_fmts;
>  	u32 num_output_fmts;
> +	bool is_ck_de_pol;
>  };
>  
>  static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val,
> u32 mask)
> @@ -213,13 +215,20 @@ static void mtk_dpi_config_pol(struct mtk_dpi
> *dpi,
>  			       struct mtk_dpi_polarities *dpi_pol)
>  {
>  	unsigned int pol;
> +	unsigned int mask;
>  
> -	pol = (dpi_pol->ck_pol == MTK_DPI_POLARITY_RISING ? 0 : CK_POL)
> |
> -	      (dpi_pol->de_pol == MTK_DPI_POLARITY_RISING ? 0 : DE_POL)
> |
> -	      (dpi_pol->hsync_pol == MTK_DPI_POLARITY_RISING ? 0 :
> HSYNC_POL) |
> +	mask = HSYNC_POL | VSYNC_POL;
> +	pol = (dpi_pol->hsync_pol == MTK_DPI_POLARITY_RISING ? 0 :
> HSYNC_POL) |
>  	      (dpi_pol->vsync_pol == MTK_DPI_POLARITY_RISING ? 0 :
> VSYNC_POL);
> -	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, pol,
> -		     CK_POL | DE_POL | HSYNC_POL | VSYNC_POL);
> +	if (dpi->conf->is_ck_de_pol) {
> +		mask |= CK_POL | DE_POL;
> +		pol |= (dpi_pol->ck_pol == MTK_DPI_POLARITY_RISING ?
> +			0 : CK_POL) |
> +		       (dpi_pol->de_pol == MTK_DPI_POLARITY_RISING ?
> +			0 : DE_POL);
> +	}
> +
> +	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, pol, mask);
>  }
>  
>  static void mtk_dpi_config_3d(struct mtk_dpi *dpi, bool en_3d)
> @@ -794,6 +803,7 @@ static const struct mtk_dpi_conf mt8173_conf = {
>  	.max_clock_khz = 300000,
>  	.output_fmts = mt8173_output_fmts,
>  	.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
> +	.is_ck_de_pol = true,
>  };
>  
>  static const struct mtk_dpi_conf mt2701_conf = {
> @@ -803,6 +813,7 @@ static const struct mtk_dpi_conf mt2701_conf = {
>  	.max_clock_khz = 150000,
>  	.output_fmts = mt8173_output_fmts,
>  	.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
> +	.is_ck_de_pol = true,
>  };
>  
>  static const struct mtk_dpi_conf mt8183_conf = {
> @@ -811,6 +822,7 @@ static const struct mtk_dpi_conf mt8183_conf = {
>  	.max_clock_khz = 100000,
>  	.output_fmts = mt8183_output_fmts,
>  	.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
> +	.is_ck_de_pol = true,
>  };
>  
>  static const struct mtk_dpi_conf mt8192_conf = {
> @@ -819,6 +831,7 @@ static const struct mtk_dpi_conf mt8192_conf = {
>  	.max_clock_khz = 150000,
>  	.output_fmts = mt8183_output_fmts,
>  	.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
> +	.is_ck_de_pol = true,
>  };
>  
>  static int mtk_dpi_probe(struct platform_device *pdev)