linux-kernel - Re: [PATCH v2 06/12] soc: mediatek: pm-domains: Add SMI block as bus protection block

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Date:   Mon, 5 Oct 2020 09:48:54 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Collabora Kernel ML <kernel@...labora.com>,
        Fabien Parent <fparent@...libre.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Weiyi Lu <weiyi.lu@...iatek.com>,
        Matthias Brugger <mbrugger@...e.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2 06/12] soc: mediatek: pm-domains: Add SMI block as bus
 protection block

On Fri, Oct 2, 2020 at 4:56 PM Matthias Brugger <matthias.bgg@...il.com> wrote:
>
>
>
> On 01/10/2020 18:01, Enric Balletbo i Serra wrote:
> > From: Matthias Brugger <mbrugger@...e.com>
> >
> > Apart from the infracfg block, the SMI block is used to enable the bus
> > protection for some power domains. Add support for this block.
> >
> > Signed-off-by: Matthias Brugger <mbrugger@...e.com>
> > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> > ---
> >
> > Changes in v2: None
> >
> >   drivers/soc/mediatek/mtk-pm-domains.c | 64 ++++++++++++++++++++-------
> >   include/linux/soc/mediatek/infracfg.h |  6 +++
> >   2 files changed, 53 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
> > index b5e7c9846c34..38f2630bdd0a 100644
> > --- a/drivers/soc/mediatek/mtk-pm-domains.c
> > +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> > @@ -56,8 +56,25 @@
> >
> >   #define SPM_MAX_BUS_PROT_DATA               3
> >
> > +#define _BUS_PROT(_mask, _set, _clr, _sta, _update) {        \
> > +             .bus_prot_mask = (_mask),               \
> > +             .bus_prot_set = _set,                   \
> > +             .bus_prot_clr = _clr,                   \
> > +             .bus_prot_sta = _sta,                   \
> > +             .bus_prot_reg_update = _update,         \
> > +     }
> > +
> > +#define BUS_PROT_WR(_mask, _set, _clr, _sta)         \
> > +             _BUS_PROT(_mask, _set, _clr, _sta, false)
> > +
> > +#define BUS_PROT_UPDATE(_mask, _set, _clr, _sta)             \
> > +             _BUS_PROT(_mask, _set, _clr, _sta, true)
> > +
> >   struct scpsys_bus_prot_data {
> >       u32 bus_prot_mask;
> > +     u32 bus_prot_set;
> > +     u32 bus_prot_clr;
> > +     u32 bus_prot_sta;
> >       bool bus_prot_reg_update;
> >   };
> >
> > @@ -69,6 +86,7 @@ struct scpsys_bus_prot_data {
> >    * @sram_pdn_ack_bits: The mask for sram power control acked bits.
> >    * @caps: The flag for active wake-up action.
> >    * @bp_infracfg: bus protection for infracfg subsystem
> > + * @bp_smi: bus protection for smi subsystem
> >    */
> >   struct scpsys_domain_data {
> >       u32 sta_mask;
> > @@ -77,6 +95,7 @@ struct scpsys_domain_data {
> >       u32 sram_pdn_ack_bits;
> >       u8 caps;
> >       const struct scpsys_bus_prot_data bp_infracfg[SPM_MAX_BUS_PROT_DATA];
> > +     const struct scpsys_bus_prot_data bp_smi[SPM_MAX_BUS_PROT_DATA];
> >   };
> >
> >   struct scpsys_domain {
> > @@ -86,6 +105,7 @@ struct scpsys_domain {
> >       int num_clks;
> >       struct clk_bulk_data *clks;
> >       struct regmap *infracfg;
> > +     struct regmap *smi;
> >   };
> >
> >   struct scpsys_soc_data {
> > @@ -175,9 +195,9 @@ static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, st
> >               if (bpd[i].bus_prot_reg_update)
> >                       regmap_update_bits(regmap, INFRA_TOPAXI_PROTECTEN, mask, mask);
> >               else
> > -                     regmap_write(regmap, INFRA_TOPAXI_PROTECTEN_SET, mask);
> > +                     regmap_write(regmap, bpd[i].bus_prot_set, mask);
> >
> > -             ret = regmap_read_poll_timeout(regmap, INFRA_TOPAXI_PROTECTSTA1,
> > +             ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
> >                                              val, (val & mask) == mask,
> >                                              MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
> >               if (ret)
> > @@ -193,7 +213,11 @@ static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
> >       int ret;
> >
> >       ret = _scpsys_bus_protect_enable(bpd, pd->infracfg);
> > -     return ret;
> > +     if (ret)
> > +             return ret;
> > +
> > +     bpd = pd->data->bp_smi;
> > +     return _scpsys_bus_protect_enable(bpd, pd->smi);

Not a huge fan or reusing bpd for 2 different things.

I think this is easier to follow:

_scpsys_bus_protect_enable(pd->data->bp_infracfg, pd->infracfg);
...
_scpsys_bus_protect_enable(pd->data->bp_smi, pd->smi);


> >   }
> >  [snip]