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

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Message-ID: <d894e6de-6f8d-1491-a077-26487636fce8@collabora.com>
Date:   Mon, 26 Oct 2020 16:18:39 +0100
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Nicolas Boichat <drinkcat@...omium.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     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

Hi Nicolas,

Thank you for your review.

On 5/10/20 3:48, Nicolas Boichat wrote:
> 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);
> 

Makes sense, applied in next version.

> 
>>>   }
>>>  [snip]