Re: [PATCH v3 05/16] soc: mediatek: pm_domains: Make bus protection generic

[Nicolas Boichat]

On Tue, Oct 27, 2020 at 1:55 AM Enric Balletbo i Serra
<enric.balletbo@xxxxxxxxxxxxx> wrote:
>
> From: Matthias Brugger <mbrugger@xxxxxxxx>
>
> Bus protection is not exclusively done by calling the infracfg misc driver.
> Make the calls for setting and clearing the bus protection generic so
> that we can use other blocks for it as well.
>
> Signed-off-by: Matthias Brugger <mbrugger@xxxxxxxx>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
> ---
>
> Changes in v3: None
> Changes in v2: None
>
>  drivers/soc/mediatek/mtk-infracfg.c   |  5 ---
>  drivers/soc/mediatek/mtk-pm-domains.c | 53 +++++++++++++++++++++------
>  include/linux/soc/mediatek/infracfg.h |  5 +++
>  3 files changed, 47 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/soc/mediatek/mtk-infracfg.c b/drivers/soc/mediatek/mtk-infracfg.c
> index 4a123796aad3..0590b68e0d78 100644
> --- a/drivers/soc/mediatek/mtk-infracfg.c
> +++ b/drivers/soc/mediatek/mtk-infracfg.c
> @@ -12,11 +12,6 @@
>  #define MTK_POLL_DELAY_US   10
>  #define MTK_POLL_TIMEOUT    (jiffies_to_usecs(HZ))
>
> -#define INFRA_TOPAXI_PROTECTEN         0x0220
> -#define INFRA_TOPAXI_PROTECTSTA1       0x0228
> -#define INFRA_TOPAXI_PROTECTEN_SET     0x0260
> -#define INFRA_TOPAXI_PROTECTEN_CLR     0x0264
> -
>  /**
>   * mtk_infracfg_set_bus_protection - enable bus protection
>   * @infracfg: The infracfg regmap
> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
> index 2121e05cb9a4..92c61e59255b 100644
> --- a/drivers/soc/mediatek/mtk-pm-domains.c
> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> @@ -87,18 +87,24 @@ static int scpsys_sram_disable(struct scpsys_domain *pd)
>                                         MTK_POLL_TIMEOUT);
>  }
>
> -static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
> +static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, struct regmap *regmap)
>  {
> -       const struct scpsys_bus_prot_data *bpd = pd->data->bp_infracfg;
>         int i, ret;
>
>         for (i = 0; i < SPM_MAX_BUS_PROT_DATA; i++) {
> -               if (!bpd[i].bus_prot_mask)
> +               u32 val, mask = bpd[i].bus_prot_mask;
> +
> +               if (!mask)
>                         break;
>
> -               ret = mtk_infracfg_set_bus_protection(pd->infracfg,
> -                                                     bpd[i].bus_prot_mask,
> -                                                     bpd[i].bus_prot_reg_update);
> +               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);
> +
> +               ret = regmap_read_poll_timeout(regmap, INFRA_TOPAXI_PROTECTSTA1,
> +                                              val, (val & mask) == mask,
> +                                              MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
>                 if (ret)
>                         return ret;
>         }
> @@ -106,18 +112,34 @@ static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
>         return 0;
>  }
>
> -static int scpsys_bus_protect_disable(struct scpsys_domain *pd)
> +static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
>  {
>         const struct scpsys_bus_prot_data *bpd = pd->data->bp_infracfg;
> +       int ret;
> +
> +       ret = _scpsys_bus_protect_enable(bpd, pd->infracfg);
> +       return ret;
> +}
> +
> +static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
> +                                      struct regmap *regmap)
> +{
>         int i, ret;
>
>         for (i = 0; i < SPM_MAX_BUS_PROT_DATA; i++) {
> -               if (!bpd[i].bus_prot_mask)
> +               u32 val, mask = bpd[i].bus_prot_mask;
> +
> +               if (!mask)
>                         return 0;
>
> -               ret = mtk_infracfg_clear_bus_protection(pd->infracfg,
> -                                                       bpd[i].bus_prot_mask,
> -                                                       bpd[i].bus_prot_reg_update);
> +               if (bpd[i].bus_prot_reg_update)
> +                       regmap_update_bits(regmap, INFRA_TOPAXI_PROTECTEN, mask, 0);
> +               else
> +                       regmap_write(regmap, INFRA_TOPAXI_PROTECTEN_CLR, mask);
> +
> +               ret = regmap_read_poll_timeout(regmap, INFRA_TOPAXI_PROTECTSTA1,
> +                                              val, !(val & mask),
> +                                              MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
>                 if (ret)
>                         return ret;
>         }
> @@ -125,6 +147,15 @@ static int scpsys_bus_protect_disable(struct scpsys_domain *pd)
>         return 0;
>  }
>
> +static int scpsys_bus_protect_disable(struct scpsys_domain *pd)
> +{
> +       const struct scpsys_bus_prot_data *bpd = pd->data->bp_infracfg;

More of a nit: The next patch gets rid of this line, so maybe you
don't need to add it here.

Also `int ret` isn't really needed, but I think that's ok since the
next CL needs to add another call.

> +       int ret;
> +
> +       ret = _scpsys_bus_protect_disable(bpd, pd->infracfg);
> +       return ret;
> +}
> +
>  static int scpsys_power_on(struct generic_pm_domain *genpd)
>  {
>         struct scpsys_domain *pd = container_of(genpd, struct scpsys_domain, genpd);
> diff --git a/include/linux/soc/mediatek/infracfg.h b/include/linux/soc/mediatek/infracfg.h
> index 233463d789c6..5bcaab767f6a 100644
> --- a/include/linux/soc/mediatek/infracfg.h
> +++ b/include/linux/soc/mediatek/infracfg.h
> @@ -32,6 +32,11 @@
>  #define MT7622_TOP_AXI_PROT_EN_WB              (BIT(2) | BIT(6) | \
>                                                  BIT(7) | BIT(8))
>
> +#define INFRA_TOPAXI_PROTECTEN                 0x0220
> +#define INFRA_TOPAXI_PROTECTSTA1               0x0228
> +#define INFRA_TOPAXI_PROTECTEN_SET             0x0260
> +#define INFRA_TOPAXI_PROTECTEN_CLR             0x0264
> +
>  #define REG_INFRA_MISC                         0xf00
>  #define F_DDR_4GB_SUPPORT_EN                   BIT(13)
>
> --
> 2.28.0
>