linux-kernel - Re: [PATCH V8 3/5] drm/mediatek: using new factor for tvdpll in MT2701

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Date:   Mon, 8 Apr 2019 11:54:42 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     wangyan wang <wangyan.wang@...iatek.com>
CC:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        "Daniel Vetter" <daniel@...ll.ch>,
        chunhui dai <chunhui.dai@...iatek.com>,
        "Colin Ian King" <colin.king@...onical.com>,
        Sean Wang <sean.wang@...iatek.com>,
        "Ryder Lee" <ryder.lee@...iatek.com>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <dri-devel@...ts.freedesktop.org>, <srv_heupstream@...iatek.com>
Subject: Re: [PATCH V8 3/5] drm/mediatek: using new factor for tvdpll in
 MT2701

Hi, Wangyan:

On Tue, 2019-04-02 at 17:36 +0800, wangyan wang wrote:
> From: Wangyan Wang <wangyan.wang@...iatek.com>
> 
> This is the second step to make MT2701 HDMI stable.
> The factor depends on the divider of DPI in MT2701, therefore,
> we should fix this factor to the right and new one.

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

> 
> Signed-off-by: Wangyan Wang <wangyan.wang@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 69c6e42dad6b..4a2f4a650494 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -662,13 +662,11 @@ static unsigned int mt8173_calculate_factor(int clock)
>  static unsigned int mt2701_calculate_factor(int clock)
>  {
>  	if (clock <= 64000)
> -		return 16;
> -	else if (clock <= 128000)
> -		return 8;
> -	else if (clock <= 256000)
>  		return 4;
> -	else
> +	else if (clock <= 128000)
>  		return 2;
> +	else
> +		return 1;
>  }
>  
>  static const struct mtk_dpi_conf mt8173_conf = {