linux-kernel - Re: [PATCH v2 04/13] drm/mediatek: add clock factor for different IC

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Date:   Thu, 6 Sep 2018 10:11:47 +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 04/13] drm/mediatek: add clock factor for different IC

Hi, Bibby:

One inline comment.

On Wed, 2018-09-05 at 16:31 +0800, Bibby Hsieh wrote:
> From: chunhui dai <chunhui.dai@...iatek.com>
> 
> different IC has different clock designed in HDMI, the factor for
> calculate clock should be different. Usinng the data in of_node
> to find this factor.
> 
> Signed-off-by: chunhui dai <chunhui.dai@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 28 +++++++++++++++++++---------
>  1 file changed, 19 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index df27107b1f0b..3758cfeb586b 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -119,6 +119,7 @@ struct mtk_dpi_yc_limit {
>  };
>  
>  struct mtk_dpi_conf {
> +	unsigned int (*cal_factor)(int clock);
>  	const u32 reg_h_fre_con;
>  	bool edge_sel_en;
>  };
> @@ -458,16 +459,12 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
>  	unsigned long pll_rate;
>  	unsigned int factor;
>  
> +	if (!dpi) {
> +		dev_err(dpi->dev, "invalid argument\n");
> +		return -EINVAL;
> +	}

I think this should not be in this patch, move to an independent patch.

Regards,
CK

>  	/* let pll_rate can fix the valid range of tvdpll (1G~2GHz) */
> -
> -	if (mode->clock <= 27000)
> -		factor = 3 << 4;
> -	else if (mode->clock <= 84000)
> -		factor = 3 << 3;
> -	else if (mode->clock <= 167000)
> -		factor = 3 << 2;
> -	else
> -		factor = 3 << 1;
> +	factor = dpi->conf->cal_factor(mode->clock);
>  	drm_display_mode_to_videomode(mode, &vm);
>  	pll_rate = vm.pixelclock * factor;
>  
> @@ -681,7 +678,20 @@ static const struct component_ops mtk_dpi_component_ops = {
>  	.unbind = mtk_dpi_unbind,
>  };
>  
> +static unsigned int mt8173_calculate_factor(int clock)
> +{
> +	if (clock <= 27000)
> +		return 3 << 4;
> +	else if (clock <= 84000)
> +		return 3 << 3;
> +	else if (clock <= 167000)
> +		return 3 << 2;
> +	else
> +		return 3 << 1;
> +}
> +
>  static const struct mtk_dpi_conf mt8173_conf = {
> +	.cal_factor = mt8173_calculate_factor,
>  	.reg_h_fre_con = 0xe0,
>  };
>