linux-kernel - Re: [PATCH 4/9] drm/mediatek: fix the rate and divder of hdmi phy for MT2701

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Date:   Thu, 17 Jan 2019 16:34:35 +0800
From:   Chunhui Dai <chunhui.dai@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     --to=Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, CK Hu <ck.hu@...iatek.com>,
        <wangyan.wang@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Sean Wang <sean.wang@...iatek.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Colin Ian King <colin.king@...onical.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>,
        <bibby.hsieh@...iatek.com>, <jamesjj.liao@...iatek.com>,
        <jitao.shi@...iatek.com>
Subject: Re: [PATCH 4/9] drm/mediatek: fix the rate and divder of hdmi phy
 for MT2701

On Wed, 2019-01-09 at 17:54 +0100, Matthias Brugger wrote:
> 
> On 04/01/2019 08:03, chunhui dai wrote:
> > fix the rate and divder of hdmi phy for MT2701.
> 
> This is a bug? Then we would need a fixes tag.

yes, we would add the tag in V2.

> Otherwise you should explain in the commit, that you need to change the
> calculation due to previous commits.
> 
> Regards,
> Matthias
> 
> > 
> > Signed-off-by: chunhui dai <chunhui.dai@...iatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c b/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> > index a28a32d..10b6235 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
> > @@ -114,8 +114,8 @@ static int mtk_hdmi_pll_set_rate(struct clk_hw *hw, unsigned long rate,
> >  
> >  	if (rate <= 64000000)
> >  		pos_div = 3;
> > -	else if (rate <= 12800000)
> > -		pos_div = 1;
> > +	else if (rate <= 128000000)
> > +		pos_div = 2;
> >  	else
> >  		pos_div = 1;
> >  
> >