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

yu-chang.lee
2024-03-25T12:19:23Z

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_SUBB_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;
+
+ 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)
+{
+ 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)
+{
+ 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);
+ 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);
+ 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);
+ if (ret)
+ return ret;
+ }
+
ret = scpsys_bus_protect_enable(pd);
if (ret < 0)
return ret;
@@ -450,12 +528,23 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
if (IS_ERR(pd->infracfg))
return ERR_CAST(pd->infracfg);

- smi_node = of_parse_phandle(node, "mediatek,smi", 0);
- if (smi_node) {
- pd->smi = device_node_to_regmap(smi_node);
- of_node_put(smi_node);
- if (IS_ERR(pd->smi))
- return ERR_CAST(pd->smi);
+ pd->num_smi = of_count_phandle_with_args(node, "mediatek,smi", NULL);
+ if (pd->num_smi > 0) {
+ pd->smi = devm_kcalloc(scpsys->dev, pd->num_smi, sizeof(*pd->smi), GFP_KERNEL);
+ if (!pd->smi)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < pd->num_smi; i++) {
+ smi_node = of_parse_phandle(node, "mediatek,smi", i);
+ if (!smi_node)
+ return ERR_PTR(-EINVAL);
+
+ pd->smi[i] = device_node_to_regmap(smi_node);
+ if (IS_ERR(pd->smi[i]))
+ return ERR_CAST(pd->smi[i]);
+ }
+ } else {
+ pd->num_smi = 0;
}

pd->num_larb = of_count_phandle_with_args(node, "mediatek,larb", NULL);
diff --git a/drivers/pmdomain/mediatek/mtk-pm-domains.h b/drivers/pmdomain/mediatek/mtk-pm-domains.h
index 31c2a1bb500f..e0eb7214719e 100644
--- a/drivers/pmdomain/mediatek/mtk-pm-domains.h
+++ b/drivers/pmdomain/mediatek/mtk-pm-domains.h
@@ -13,6 +13,7 @@
#define MTK_SCPD_EXT_BUCK_ISO BIT(6)
#define MTK_SCPD_HAS_INFRA_NAO BIT(7)
#define MTK_SCPD_STRICT_BUS_PROTECTION BIT(8)
+#define MTK_SCPD_CLAMP_PROTECTION BIT(9)
#define MTK_SCPD_CAPS(_scpd, _x) ((_scpd)->data->caps & (_x))

#define SPM_VDE_PWR_CON 0x0210
--
2.18.0