linux-kernel - Re: [PATCH v9 08/22] drm/mediatek: dpi: implement a CK/DE pol toggle in SoC config

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Date:   Mon, 28 Mar 2022 15:31:28 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     Guillaume Ranquet <granquet@...libre.com>, <airlied@...ux.ie>,
        <angelogioacchino.delregno@...labora.com>,
        <chunfeng.yun@...iatek.com>, <chunkuang.hu@...nel.org>,
        <ck.hu@...iatek.com>, <daniel@...ll.ch>, <deller@....de>,
        <jitao.shi@...iatek.com>, <kishon@...com>, <krzk+dt@...nel.org>,
        <maarten.lankhorst@...ux.intel.com>, <matthias.bgg@...il.com>,
        <mripard@...nel.org>, <p.zabel@...gutronix.de>,
        <robh+dt@...nel.org>, <tzimmermann@...e.de>, <vkoul@...nel.org>
CC:     <devicetree@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-fbdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-phy@...ts.infradead.org>, <markyacoub@...gle.com>
Subject: Re: [PATCH v9 08/22] drm/mediatek: dpi: implement a CK/DE pol
 toggle in SoC config

On Mon, 2022-03-28 at 00:39 +0200, Guillaume Ranquet wrote:
> Adds a bit of flexibility to support SoCs without CK/DE pol support
> 
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 22 +++++++++++++++++-----
>  1 file changed, 17 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 4746eb342567..545a1337cc89 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -125,6 +125,7 @@ struct mtk_dpi_conf {
>  	bool edge_sel_en;
>  	const u32 *output_fmts;
>  	u32 num_output_fmts;
> +	bool is_ck_de_pol;
>  	const struct mtk_dpi_yc_limit *limit;
>  };
>  
> @@ -211,13 +212,20 @@ 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)
> @@ -799,6 +807,7 @@ 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,
>  	.limit = &mtk_dpi_limit,
>  };
>  
> @@ -809,6 +818,7 @@ 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,
>  	.limit = &mtk_dpi_limit,
>  };
>  
> @@ -818,6 +828,7 @@ 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,
>  	.limit = &mtk_dpi_limit,
>  };
>  
> @@ -827,6 +838,7 @@ static const struct mtk_dpi_conf mt8192_conf = {
>  	.max_clock_khz = 150000,
>  	.output_fmts = mt8173_output_fmts,
>  	.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
> +	.is_ck_de_pol = true,
>  	.limit = &mtk_dpi_limit,
>  };
>  

Reviewed-by: Rex-BC Chen <rex-bc.chen@...iatek.com>