Re: [PATCH 2/2] soc: mediatek: pm-domains: support smi clamp protection

Yu-chang Lee (李禹璋)
2024-03-26T02:01:13Z

On Mon, 2024-03-25 at 14:05 +0100, AngeloGioacchino Del Regno wrote:
> Il 25/03/24 13:19, yu-chang.lee ha scritto:
> > In order to avoid power glitch, this patch use smi clamp
> > to disable/enable smi common port.
> >
> > Signed-off-by: yu-chang.lee <yu-chang.lee@mediatek.com>
> > ---
> > drivers/pmdomain/mediatek/mt8188-pm-domains.h | 41 ++++-
> > drivers/pmdomain/mediatek/mtk-pm-domains.c | 147
> > ++++++++++++++----
> > drivers/pmdomain/mediatek/mtk-pm-domains.h | 1 +
> > 3 files changed, 156 insertions(+), 33 deletions(-)
> >
> > diff --git a/drivers/pmdomain/mediatek/mt8188-pm-domains.h
> > b/drivers/pmdomain/mediatek/mt8188-pm-domains.h
> > index 7bbba4d56a77..39f057dca92c 100644
> > --- a/drivers/pmdomain/mediatek/mt8188-pm-domains.h
> > +++ b/drivers/pmdomain/mediatek/mt8188-pm-domains.h
> > @@ -573,6 +573,18 @@ static const struct scpsys_domain_data
> > scpsys_domain_data_mt8188[] = {
> > .pwr_sta2nd_offs = 0x170,
> > .sram_pdn_bits = BIT(8),
> > .sram_pdn_ack_bits = BIT(12),
> > + .bp_cfg = {
> > + BUS_PROT_WR(SMI,
> > + MT8188_SMI_COMMON_SMI_CLAMP_DIP_TO_
> > VDO0,
> > + MT8188_SMI_COMMON_CLAMP_EN_SET,
> > + MT8188_SMI_COMMON_CLAMP_EN_CLR,
> > + MT8188_SMI_COMMON_CLAMP_EN_STA),
> > + BUS_PROT_WR(SMI,
> > + MT8188_SMI_COMMON_SMI_CLAMP_DIP_TO_
> > VPP1,
> > + MT8188_SMI_COMMON_CLAMP_EN_SET,
> > + MT8188_SMI_COMMON_CLAMP_EN_CLR,
> > + MT8188_SMI_COMMON_CLAMP_EN_STA),
> > + },
> > .reset_smi = {
> > SMI_RESET_WR(MT8188_SMI_LARB10_RESET,
> > MT8188_SMI_LARB10_RESET_ADDR),
> > @@ -585,7 +597,7 @@ static const struct scpsys_domain_data
> > scpsys_domain_data_mt8188[] = {
> > SMI_RESET_WR(MT8188_SMI_LARB15_RESET,
> > MT8188_SMI_LARB15_RESET_ADDR),
> > },
> > - .caps = MTK_SCPD_KEEP_DEFAULT_OFF,
> > + .caps = MTK_SCPD_KEEP_DEFAULT_OFF |
> > MTK_SCPD_CLAMP_PROTECTION,
> > },
> > [MT8188_POWER_DOMAIN_IPE] = {
> > .name = "ipe",
> > @@ -595,11 +607,18 @@ static const struct scpsys_domain_data
> > scpsys_domain_data_mt8188[] = {
> > .pwr_sta2nd_offs = 0x170,
> > .sram_pdn_bits = BIT(8),
> > .sram_pdn_ack_bits = BIT(12),
> > + .bp_cfg = {
> > + BUS_PROT_WR(SMI,
> > + MT8188_SMI_COMMON_SMI_CLAMP_IPE_TO_
> > VPP1,
> > + MT8188_SMI_COMMON_CLAMP_EN_SET,
> > + MT8188_SMI_COMMON_CLAMP_EN_CLR,
> > + MT8188_SMI_COMMON_CLAMP_EN_STA),
> > + },
> > .reset_smi = {
> > SMI_RESET_WR(MT8188_SMI_LARB12_RESET,
> > MT8188_SMI_LARB12_RESET_ADDR),
> > },
> > - .caps = MTK_SCPD_KEEP_DEFAULT_OFF,
> > + .caps = MTK_SCPD_KEEP_DEFAULT_OFF |
> > MTK_SCPD_CLAMP_PROTECTION,
> > },
> > [MT8188_POWER_DOMAIN_CAM_VCORE] = {
> > .name = "cam_vcore",
> > @@ -676,13 +695,20 @@ static const struct scpsys_domain_data
> > scpsys_domain_data_mt8188[] = {
> > .pwr_sta2nd_offs = 0x170,
> > .sram_pdn_bits = BIT(8),
> > .sram_pdn_ack_bits = BIT(12),
> > + .bp_cfg = {
> > + BUS_PROT_WR(SMI,
> > + MT8188_SMI_COMMON_SMI_CLAMP_IPE_TO_
> > VPP1,
> > + MT8188_SMI_COMMON_CLAMP_EN_SET,
> > + MT8188_SMI_COMMON_CLAMP_EN_CLR,
> > + MT8188_SMI_COMMON_CLAMP_EN_STA),
> > + },
> > .reset_smi = {
> > SMI_RESET_WR(MT8188_SMI_LARB16A_RESET,
> > MT8188_SMI_LARB16A_RESET_ADDR),
> > SMI_RESET_WR(MT8188_SMI_LARB17A_RESET,
> > MT8188_SMI_LARB17A_RESET_ADDR),
> > },
> > - .caps = MTK_SCPD_KEEP_DEFAULT_OFF,
> > + .caps = MTK_SCPD_KEEP_DEFAULT_OFF |
> > MTK_SCPD_CLAMP_PROTECTION,
> > },
> > [MT8188_POWER_DOMAIN_CAM_SUBB] = {
> > .name = "cam_subb",
> > @@ -692,13 +718,20 @@ static const struct scpsys_domain_data
> > scpsys_domain_data_mt8188[] = {
> > .pwr_sta2nd_offs = 0x170,
> > .sram_pdn_bits = BIT(8),
> > .sram_pdn_ack_bits = BIT(12),
> > + .bp_cfg = {
> > + BUS_PROT_WR(SMI,
> > + MT8188_SMI_COMMON_SMI_CLAMP_CAM_SUB
> > B_TO_VDO0,
> > + MT8188_SMI_COMMON_CLAMP_EN_SET,
> > + MT8188_SMI_COMMON_CLAMP_EN_CLR,
> > + MT8188_SMI_COMMON_CLAMP_EN_STA),
> > + },
> > .reset_smi = {
> > SMI_RESET_WR(MT8188_SMI_LARB16B_RESET,
> > MT8188_SMI_LARB16B_RESET_ADDR),
> > SMI_RESET_WR(MT8188_SMI_LARB17B_RESET,
> > MT8188_SMI_LARB17B_RESET_ADDR),
> > },
> > - .caps = MTK_SCPD_KEEP_DEFAULT_OFF,
> > + .caps = MTK_SCPD_KEEP_DEFAULT_OFF |
> > MTK_SCPD_CLAMP_PROTECTION,
> > },
> > };
> >
> > diff --git a/drivers/pmdomain/mediatek/mtk-pm-domains.c
> > b/drivers/pmdomain/mediatek/mtk-pm-domains.c
> > index 9ab6fa105c8c..3c797e136c0e 100644
> > --- a/drivers/pmdomain/mediatek/mtk-pm-domains.c
> > +++ b/drivers/pmdomain/mediatek/mtk-pm-domains.c
> > @@ -47,9 +47,10 @@ struct scpsys_domain {
> > struct clk_bulk_data *subsys_clks;
> > struct regmap *infracfg_nao;
> > struct regmap *infracfg;
> > - struct regmap *smi;
> > + struct regmap **smi;
> > struct regmap **larb;
> > int num_larb;
> > + int num_smi;
> > struct regulator *supply;
> > };
> >
> > @@ -122,29 +123,19 @@ static int scpsys_sram_disable(struct
> > scpsys_domain *pd)
> > MTK_POLL_TIMEOUT);
> > }
> >
> > -static struct regmap *scpsys_bus_protect_get_regmap(struct
> > scpsys_domain *pd,
> > - const struct
> > scpsys_bus_prot_data *bpd)
> > -{
> > - if (bpd->flags & BUS_PROT_COMPONENT_SMI)
> > - return pd->smi;
> > - else
> > - return pd->infracfg;
> > -}
> > -
> > static struct regmap *scpsys_bus_protect_get_sta_regmap(struct
> > scpsys_domain *pd,
> > const struct
> > scpsys_bus_prot_data *bpd)
> > {
> > if (bpd->flags & BUS_PROT_STA_COMPONENT_INFRA_NAO)
> > return pd->infracfg_nao;
> > else
> > - return scpsys_bus_protect_get_regmap(pd, bpd);
> > + return pd->infracfg;
> > }
> >
> > static int scpsys_bus_protect_clear(struct scpsys_domain *pd,
> > - const struct scpsys_bus_prot_data
> > *bpd)
> > + const struct scpsys_bus_prot_data
> > *bpd,
> > + struct regmap *sta_regmap,
> > struct regmap *regmap)
> > {
> > - struct regmap *sta_regmap =
> > scpsys_bus_protect_get_sta_regmap(pd, bpd);
> > - struct regmap *regmap = scpsys_bus_protect_get_regmap(pd, bpd);
> > u32 sta_mask = bpd->bus_prot_sta_mask;
> > u32 expected_ack;
> > u32 val;
> > @@ -165,10 +156,9 @@ static int scpsys_bus_protect_clear(struct
> > scpsys_domain *pd,
> > }
> >
> > static int scpsys_bus_protect_set(struct scpsys_domain *pd,
> > - const struct scpsys_bus_prot_data
> > *bpd)
> > + const struct scpsys_bus_prot_data
> > *bpd,
> > + struct regmap *sta_regmap, struct
> > regmap *regmap)
> > {
> > - struct regmap *sta_regmap =
> > scpsys_bus_protect_get_sta_regmap(pd, bpd);
> > - struct regmap *regmap = scpsys_bus_protect_get_regmap(pd, bpd);
> > u32 sta_mask = bpd->bus_prot_sta_mask;
> > u32 val;
> >
> > @@ -182,19 +172,32 @@ static int scpsys_bus_protect_set(struct
> > scpsys_domain *pd,
> > MTK_POLL_DELAY_US,
> > MTK_POLL_TIMEOUT);
> > }
> >
> > -static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
> > +static int _scpsys_clamp_bus_protection_enable(struct
> > scpsys_domain *pd, bool is_smi)
> > {
> > + int smi_count = 0;
> > +
> > for (int i = 0; i < SPM_MAX_BUS_PROT_DATA; i++) {
> > const struct scpsys_bus_prot_data *bpd = &pd->data-
> > >bp_cfg[i];
> > + struct regmap *sta_regmap, *regmap;
> > + bool is_smi = bpd->flags & BUS_PROT_COMPONENT_SMI;
> > int ret;
> >
> > if (!bpd->bus_prot_set_clr_mask)
> > break;
> >
> > + if (is_smi) {
> > + sta_regmap = pd->smi[smi_count];
> > + regmap = pd->smi[smi_count];
> > + smi_count++;
> > + } else {
> > + sta_regmap =
> > scpsys_bus_protect_get_sta_regmap(pd, bpd);
> > + regmap = pd->infracfg;
> > + }
> > +
> > if (bpd->flags & BUS_PROT_INVERTED)
> > - ret = scpsys_bus_protect_clear(pd, bpd);
> > + ret = scpsys_bus_protect_clear(pd, bpd,
> > sta_regmap, regmap);
> > else
> > - ret = scpsys_bus_protect_set(pd, bpd);
> > + ret = scpsys_bus_protect_set(pd, bpd,
> > sta_regmap, regmap);
> > if (ret)
> > return ret;
> > }
> > @@ -202,19 +205,32 @@ 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_clamp_bus_protection_disable(struct
> > scpsys_domain *pd, bool is_smi)
> > {
> > + int smi_count = pd->num_smi - 1;
> > +
> > for (int i = SPM_MAX_BUS_PROT_DATA - 1; i >= 0; i--) {
> > const struct scpsys_bus_prot_data *bpd = &pd->data-
> > >bp_cfg[i];
> > + struct regmap *sta_regmap, *regmap;
> > + bool is_smi = bpd->flags & BUS_PROT_COMPONENT_SMI;
> > int ret;
> >
> > if (!bpd->bus_prot_set_clr_mask)
> > continue;
> >
> > + if (is_smi) {
> > + sta_regmap = pd->smi[smi_count];
> > + regmap = pd->smi[smi_count];
> > + smi_count--;
> > + } else {
> > + sta_regmap =
> > scpsys_bus_protect_get_sta_regmap(pd, bpd);
> > + regmap = pd->infracfg;
> > + }
> > +
> > if (bpd->flags & BUS_PROT_INVERTED)
> > - ret = scpsys_bus_protect_set(pd, bpd);
> > + ret = scpsys_bus_protect_set(pd, bpd,
> > sta_regmap, regmap);
> > else
> > - ret = scpsys_bus_protect_clear(pd, bpd);
> > + ret = scpsys_bus_protect_clear(pd, bpd,
> > sta_regmap, regmap);
> > if (ret)
> > return ret;
> > }
> > @@ -222,6 +238,50 @@ static int scpsys_bus_protect_disable(struct
> > scpsys_domain *pd)
> > return 0;
> > }
> >
> > +static int scpsys_clamp_protection(struct scpsys_domain *pd)
> > +{
> > + int ret;
> > +
>
> You can directly call _scpsys_clamp_bus_protection_enable(), no need
> for a helper.
>
> > + ret = _scpsys_clamp_bus_protection_enable(pd, true);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +static int scpsys_clamp_protection_disable(struct scpsys_domain
> > *pd)
> > +{
> > + int ret;
> > +
> > + ret = _scpsys_clamp_bus_protection_disable(pd, true);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +static int scpsys_bus_protect_enable(struct scpsys_domain *pd)
>
> Unused function, please remove.

I think this is used in scpsys_power_off function. Do you mean I
should directly call _scpsys_clamp_bus_protection_disable?

>
> > +{
> > + int ret;
> > +
> > + ret = _scpsys_clamp_bus_protection_enable(pd, false);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +static int scpsys_bus_protect_disable(struct scpsys_domain *pd)
> > +{
>
> Unused function, please remove.

Same here, I think this is used in scpsys_power_on function.

>
> > + int ret;
> > +
> > + ret = _scpsys_clamp_bus_protection_disable(pd, false);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > static int scpsys_regulator_enable(struct regulator *supply)
> > {
> > return supply ? regulator_enable(supply) : 0;
> > @@ -272,6 +332,12 @@ static int scpsys_power_on(struct
> > generic_pm_domain *genpd)
> > bool tmp;
> > int ret;
> >
> > + if (MTK_SCPD_CAPS(pd, MTK_SCPD_CLAMP_PROTECTION)) {
> > + ret = scpsys_clamp_protection(pd);
>
> ret = scpsys_clamp_bus_protection_enable(pd, true);
>
> > + if (ret)
> > + return ret;
> > + }
> > +
> > ret = scpsys_regulator_enable(pd->supply);
> > if (ret)
> > return ret;
> > @@ -318,6 +384,12 @@ static int scpsys_power_on(struct
> > generic_pm_domain *genpd)
> > if (ret < 0)
> > goto err_disable_subsys_clks;
> >
> > + if (MTK_SCPD_CAPS(pd, MTK_SCPD_CLAMP_PROTECTION)) {
> > + ret = scpsys_clamp_protection_disable(pd);
>
> ret = scpsys_clamp_bus_protection_disable(pd, true);
>
> > + if (ret)
> > + return ret;
> > + }
> > +
> > ret = scpsys_bus_protect_disable(pd);
> > if (ret < 0)
> > goto err_disable_sram;
> > @@ -353,6 +425,12 @@ static int scpsys_power_off(struct
> > generic_pm_domain *genpd)
> > bool tmp;
> > int ret;
> >
> > + if (MTK_SCPD_CAPS(pd, MTK_SCPD_CLAMP_PROTECTION)) {
> > + ret = scpsys_clamp_protection(pd);
>
> ret = scpsys_clamp_bus_protection_enable(pd, true);
>
> > + if (ret)
> > + return ret;
> > + }
> > +
> > ret = scpsys_bus_protect_enable(pd);
> > if (ret < 0)
> > return ret;
>
> Regards,
> Angelo
>
Best Regards,
yu-chang.lee