linux-kernel - Re: [PATCH v2 03/13] drm/mediatek: adjust EDGE to match clock and data

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Date:   Wed, 5 Sep 2018 18:47:14 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Bibby Hsieh <bibby.hsieh@...iatek.com>
CC:     David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        Cawa Cheng <cawa.cheng@...iatek.com>,
        Daniel Kurtz <djkurtz@...omium.org>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        YT Shen <yt.shen@...iatek.com>,
        "Thierry Reding" <thierry.reding@...il.com>,
        Mao Huang <littlecvr@...omium.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        "Sascha Hauer" <kernel@...gutronix.de>,
        chunhui dai <chunhui.dai@...iatek.com>
Subject: Re: [PATCH v2 03/13] drm/mediatek: adjust EDGE to match clock and
 data

Hi, Bibby:

On Wed, 2018-09-05 at 16:31 +0800, Bibby Hsieh wrote:
> From: chunhui dai <chunhui.dai@...iatek.com>
> 
> The default timing of DPI data and clock is not match.
> We could adjust this bit to make them match.
> 
> Signed-off-by: chunhui dai <chunhui.dai@...iatek.com>

Reviewed-by: CK Hu <ck.hu@...iatek.com>

> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c      | 8 ++++++++
>  drivers/gpu/drm/mediatek/mtk_dpi_regs.h | 1 +
>  2 files changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 3db959fed493..df27107b1f0b 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 {
>  
>  struct mtk_dpi_conf {
>  	const u32 reg_h_fre_con;
> +	bool edge_sel_en;
>  };
>  
>  static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
> @@ -350,6 +351,12 @@ static void mtk_dpi_config_2n_h_fre(struct mtk_dpi *dpi)
>  	mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, H_FRE_2N, H_FRE_2N);
>  }
>  
> +static void mtk_dpi_config_disable_edge(struct mtk_dpi *dpi)
> +{
> +	if (dpi->conf->edge_sel_en)
> +		mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, 0, EDGE_SEL_EN);
> +}
> +
>  static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
>  					enum mtk_dpi_out_color_format format)
>  {
> @@ -535,6 +542,7 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
>  	mtk_dpi_config_yc_map(dpi, dpi->yc_map);
>  	mtk_dpi_config_color_format(dpi, dpi->color_format);
>  	mtk_dpi_config_2n_h_fre(dpi);
> +	mtk_dpi_config_disable_edge(dpi);
>  	mtk_dpi_sw_reset(dpi, false);
>  
>  	return 0;
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> index 040444d7718d..d9db8c4cacd7 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> @@ -223,5 +223,6 @@
>  #define ESAV_CODE2			(0xFFF << 0)
>  #define ESAV_CODE3_MSB			BIT(16)
>  
> +#define EDGE_SEL_EN			BIT(5)
>  #define H_FRE_2N			BIT(25)
>  #endif /* __MTK_DPI_REGS_H */