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Date:   Tue, 29 Dec 2020 09:34:10 +0800
From:   Yongqiang Niu <yongqiang.niu@...iatek.com>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>
CC:     CK Hu <ck.hu@...iatek.com>, Philipp Zabel <p.zabel@...gutronix.de>,
        "Rob Herring" <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        DTML <devicetree@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "Daniel Vetter" <daniel@...ll.ch>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3, 7/8] soc: mediatek: mmsys: Use function call for
 setting mmsys ovl mout register

On Tue, 2020-12-29 at 00:38 +0800, Chun-Kuang Hu wrote:
> Hi, Yongqiang:
> 
> Yongqiang Niu <yongqiang.niu@...iatek.com> 於 2020年12月28日 週一 下午4:38寫道:
> >
> > Use function call for setting mmsys ovl mout register
> >
> > Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> > ---
> >  drivers/soc/mediatek/mmsys/mtk-mmsys.c | 20 ++++++++++++++++++++
> >  include/linux/soc/mediatek/mtk-mmsys.h |  3 +++
> >  2 files changed, 23 insertions(+)
> >
> > diff --git a/drivers/soc/mediatek/mmsys/mtk-mmsys.c b/drivers/soc/mediatek/mmsys/mtk-mmsys.c
> > index dae665b..ea36a11 100644
> > --- a/drivers/soc/mediatek/mmsys/mtk-mmsys.c
> > +++ b/drivers/soc/mediatek/mmsys/mtk-mmsys.c
> > @@ -74,6 +74,17 @@ void mtk_mmsys_ddp_connect(struct device *dev,
> >                 reg = readl_relaxed(mmsys->regs + addr) | value;
> >                 writel_relaxed(reg, mmsys->regs + addr);
> >         }
> > +
> > +       if (!funcs->ovl_mout_en)
> > +               return;
> > +
> > +       if (funcs->ovl_mout_en) {
> > +               value = funcs->ovl_mout_en(cur, next, &addr);
> > +               if (value) {
> > +                       reg = readl_relaxed(mmsys->regs + addr) | value;
> > +                       writel_relaxed(reg, mmsys->regs + addr);
> > +               }
> > +       }
> 
> mtk_mmsys_ddp_mout_en() could write register inside it rather than
> return value and write register in mtk_mmsys_ddp_connect(). So you
> could do ovl_mout_en() in mtk_mmsys_ddp_mout_en().
> 
> Regards,
> Chun-Kuang.

i will add this modification in next version
> 
> >  }
> >  EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_connect);
> >
> > @@ -99,6 +110,15 @@ void mtk_mmsys_ddp_disconnect(struct device *dev,
> >                 reg = readl_relaxed(mmsys->regs + addr) & ~value;
> >                 writel_relaxed(reg, mmsys->regs + addr);
> >         }
> > +
> > +       if (!funcs->ovl_mout_en)
> > +               return;
> > +
> > +       value = funcs->ovl_mout_en(cur, next, &addr);
> > +       if (value) {
> > +               reg = readl_relaxed(mmsys->regs + addr) & ~value;
> > +               writel_relaxed(reg, mmsys->regs + addr);
> > +       }
> >  }
> >  EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_disconnect);
> >
> > diff --git a/include/linux/soc/mediatek/mtk-mmsys.h b/include/linux/soc/mediatek/mtk-mmsys.h
> > index aa4f60e..220203d 100644
> > --- a/include/linux/soc/mediatek/mtk-mmsys.h
> > +++ b/include/linux/soc/mediatek/mtk-mmsys.h
> > @@ -49,6 +49,9 @@ struct mtk_mmsys_conn_funcs {
> >         u32 (*mout_en)(enum mtk_ddp_comp_id cur,
> >                        enum mtk_ddp_comp_id next,
> >                        unsigned int *addr);
> > +       u32 (*ovl_mout_en)(enum mtk_ddp_comp_id cur,
> > +                          enum mtk_ddp_comp_id next,
> > +                          unsigned int *addr);
> >         u32 (*sel_in)(enum mtk_ddp_comp_id cur,
> >                       enum mtk_ddp_comp_id next,
> >                       unsigned int *addr);
> > --
> > 1.8.1.1.dirty
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek

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