linux-kernel - Re: [PATCH v2 10/11] memory: mtk-smi: mt8195: Add initial setting for smi-common

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Date:   Thu, 22 Jul 2021 14:38:33 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Ikjoon Jang <ikjn@...omium.org>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Krzysztof Kozlowski" <krzk@...nel.org>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Tomasz Figa <tfiga@...omium.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <youlin.pei@...iatek.com>,
        <anan.sun@...iatek.com>, <ming-fan.chen@...iatek.com>,
        <yi.kuo@...iatek.com>, <anthony.huang@...iatek.com>
Subject: Re: [PATCH v2 10/11] memory: mtk-smi: mt8195: Add initial setting
 for smi-common

On Wed, 2021-07-21 at 20:54 +0800, Ikjoon Jang wrote:
> On Thu, Jul 15, 2021 at 8:25 PM Yong Wu <yong.wu@...iatek.com> wrote:
> >
> > To improve the performance, add initial setting for smi-common.
> > some register use some fix setting(suggested from DE).
> >
> > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > ---
> >  drivers/memory/mtk-smi.c | 42 ++++++++++++++++++++++++++++++++++++----
> >  1 file changed, 38 insertions(+), 4 deletions(-)

[...]

> >  static const struct mtk_smi_common_plat mtk_smi_sub_common_mt8195 = {
> > @@ -530,15 +558,21 @@ static int mtk_smi_common_remove(struct platform_device *pdev)
> >  static int __maybe_unused mtk_smi_common_resume(struct device *dev)
> >  {
> >         struct mtk_smi *common = dev_get_drvdata(dev);
> > -       u32 bus_sel = common->plat->bus_sel;
> > -       int ret;
> > +       const struct mtk_smi_reg_pair *init = common->plat->init;
> > +       u32 bus_sel = common->plat->bus_sel; /* default is 0 */
> > +       int ret, i;
> >
> >         ret = clk_bulk_prepare_enable(common->clk_num, common->clks);
> >         if (ret)
> >                 return ret;
> >
> > -       if (common->plat->type == MTK_SMI_GEN2 && bus_sel)
> > -               writel(bus_sel, common->base + SMI_BUS_SEL);
> > +       if (common->plat->type != MTK_SMI_GEN2)
> > +               return 0;
> > +
> > +       for (i = 0; i < SMI_COMMON_INIT_REGS_NR && init && init[i].offset; i++)
> > +               writel_relaxed(init[i].value, common->base + init[i].offset);
> 
> I'm not sure this array for register settings could be applied to other
> platforms in future or only applied to mt8195. If it's only for mt8195,

The other platforms have the nearly same setting.

> I think taking callback function instead of mtk_smi_reg_pair[] as init member
> would be better:
> 
> if (common->plat->init)
>     common->plat->init(...);
> 
> > +
> > +       writel(bus_sel, common->base + SMI_BUS_SEL);
> >         return 0;
> >  }
> >
> > --
> > 2.18.0
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek
> 
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek

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