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

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Message-ID: <1627540902.13818.3.camel@mhfsdcap03>
Date:   Thu, 29 Jul 2021 14:41:42 +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>
Subject: Re: [PATCH v2 11/11] memory: mtk-smi: mt8195: Add initial setting
 for smi-larb

Hi Ikjoon,

Just a ping.

On Thu, 2021-07-22 at 14:38 +0800, Yong Wu wrote:
> On Wed, 2021-07-21 at 21:40 +0800, Ikjoon Jang wrote:
> > On Thu, Jul 15, 2021 at 8:23 PM Yong Wu <yong.wu@...iatek.com> wrote:
> > >
> > > To improve the performance, We add some initial setting for smi larbs.
> > > there are two part:
> > > 1), Each port has the special ostd(outstanding) value in each larb.
> > > 2), Two general setting for each larb.
> > >
> > > In some SoC, this setting maybe changed dynamically for some special case
> > > like 4K, and this initial setting is enough in mt8195.
> > >
> > > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > > ---
> [...]
> > >  struct mtk_smi {
> > > @@ -213,12 +228,22 @@ static void mtk_smi_larb_config_port_mt8173(struct device *dev)
> > >  static void mtk_smi_larb_config_port_gen2_general(struct device *dev)
> > >  {
> > >         struct mtk_smi_larb *larb = dev_get_drvdata(dev);
> > > -       u32 reg;
> > > +       u32 reg, flags_general = larb->larb_gen->flags_general;
> > > +       const u8 *larbostd = larb->larb_gen->ostd[larb->larbid];
> > >         int i;
> > >
> > >         if (BIT(larb->larbid) & larb->larb_gen->larb_direct_to_common_mask)
> > >                 return;
> > >
> > > +       if (MTK_SMI_CAPS(flags_general, MTK_SMI_FLAG_LARB_THRT_EN))
> > > +               writel_relaxed(SMI_LARB_THRT_EN, larb->base + SMI_LARB_CMD_THRT_CON);
> > > +
> > > +       if (MTK_SMI_CAPS(flags_general, MTK_SMI_FLAG_LARB_SW_FLAG))
> > > +               writel_relaxed(SMI_LARB_SW_FLAG_1, larb->base + SMI_LARB_SW_FLAG);
> > > +
> > > +       for (i = 0; i < SMI_LARB_PORT_NR_MAX && larbostd && !!larbostd[i]; i++)
> > > +               writel_relaxed(larbostd[i], larb->base + SMI_LARB_OSTDL_PORTx(i));
> > 
> > All other mtk platform's larbs have the same format for SMI_LARB_OSTDL_PORTx()
> > registers at the same offset? or is this unique feature for mt8195?
> 
> All the other Platform's larbs have the same format at the same offset.

In this case, Do you have some other further comment? If no, I will keep
the current solution for this.

Thanks.

> 
> > 
> > > +
> > >         for_each_set_bit(i, (unsigned long *)larb->mmu, 32) {
> > >                 reg = readl_relaxed(larb->base + SMI_LARB_NONSEC_CON(i));
> > >                 reg |= F_MMU_EN;
> > > @@ -227,6 +252,51 @@ static void mtk_smi_larb_config_port_gen2_general(struct device *dev)
> > >         }
> > >  }
> > >
> 
> [...]
>