diff --git a/drivers/pmdomain/mediatek/mtk-pm-domains.c b/drivers/pmdomain/mediatek/mtk-pm-domains.c
index 8309a4b46afb..5b4d860318a4 100644
--- a/drivers/pmdomain/mediatek/mtk-pm-domains.c
+++ b/drivers/pmdomain/mediatek/mtk-pm-domains.c
@@ -57,6 +57,10 @@
 
 #define MTK_SIP_KERNEL_HWCCF_CONTROL	MTK_SIP_SMC_CMD(0x540)
 
+/* Secure MTCMOS commands for modem subsystem */
+#define MTK_MD_MTCMOS_ENABLE		18
+#define MTK_MD_MTCMOS_DISABLE		19
+
 struct scpsys_domain {
 	struct generic_pm_domain genpd;
 	const struct scpsys_domain_data *data;
@@ -668,6 +672,34 @@ static int scpsys_modem_pwrseq_off(struct scpsys_domain *pd)
 	return 0;
 }
 
+static bool scpsys_modem_sec_poll(unsigned long cmd)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_smc(MTK_SIP_KERNEL_CCCI_CONTROL, cmd, 1, 0, 0, 0, 0, 0, &res);
+
+	return res.a0 == 0;
+}
+
+static int scpsys_modem_sec_power_on(bool on)
+{
+	struct arm_smccc_res res;
+	unsigned long cmd = on ? MTK_MD_MTCMOS_ENABLE : MTK_MD_MTCMOS_DISABLE;
+	bool tmp;
+	int ret;
+
+	arm_smccc_smc(MTK_SIP_KERNEL_CCCI_CONTROL, cmd, 0, 0, 0, 0, 0, 0, &res);
+	if (res.a0 == 0)
+		return 0;
+
+	ret = readx_poll_timeout(scpsys_modem_sec_poll, cmd, tmp, tmp,
+				 MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
 static int scpsys_power_on(struct generic_pm_domain *genpd)
 {
 	struct scpsys_domain *pd = container_of(genpd, struct scpsys_domain, genpd);
@@ -686,7 +718,9 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
 		regmap_clear_bits(scpsys->base, pd->data->ext_buck_iso_offs,
 				  pd->data->ext_buck_iso_mask);
 
-	if (MTK_SCPD_CAPS(pd, MTK_SCPD_MODEM_PWRSEQ))
+	if (MTK_SCPD_CAPS(pd, MTK_SCPD_MODEM_SECURE_PWRSEQ))
+		ret = scpsys_modem_sec_power_on(true);
+	else if (MTK_SCPD_CAPS(pd, MTK_SCPD_MODEM_PWRSEQ))
 		ret = scpsys_modem_pwrseq_on(pd);
 	else if (MTK_SCPD_CAPS(pd, MTK_SCPD_SIMPLE_PWRSEQ))
 		ret = scpsys_simple_pwrseq_on(pd);
@@ -717,7 +751,8 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
 			goto err_pwr_ack;
 	}
 
-	if (!MTK_SCPD_CAPS(pd, MTK_SCPD_SIMPLE_PWRSEQ)) {
+	if (!MTK_SCPD_CAPS(pd, MTK_SCPD_SIMPLE_PWRSEQ) &&
+	    !MTK_SCPD_CAPS(pd, MTK_SCPD_MODEM_SECURE_PWRSEQ)) {
 		ret = scpsys_sram_enable(pd);
 		if (ret < 0)
 			goto err_disable_subsys_clks;
@@ -739,7 +774,8 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
 err_enable_bus_protect:
 	scpsys_bus_protect_enable(pd, 0);
 err_disable_sram:
-	if (!MTK_SCPD_CAPS(pd, MTK_SCPD_SIMPLE_PWRSEQ))
+	if (!MTK_SCPD_CAPS(pd, MTK_SCPD_SIMPLE_PWRSEQ) &&
+	    !MTK_SCPD_CAPS(pd, MTK_SCPD_MODEM_SECURE_PWRSEQ))
 		scpsys_sram_disable(pd);
 err_disable_subsys_clks:
 	if (!MTK_SCPD_CAPS(pd, MTK_SCPD_STRICT_BUS_PROTECTION))
@@ -761,7 +797,11 @@ static int scpsys_power_off_internal(struct scpsys_domain *pd)
 	if (ret < 0)
 		return ret;
 
-	if (!MTK_SCPD_CAPS(pd, MTK_SCPD_SIMPLE_PWRSEQ)) {
+	if (MTK_SCPD_CAPS(pd, MTK_SCPD_MODEM_SECURE_PWRSEQ)) {
+		ret = scpsys_modem_sec_power_on(false);
+		if (ret)
+			return ret;
+	} else if (!MTK_SCPD_CAPS(pd, MTK_SCPD_SIMPLE_PWRSEQ)) {
 		ret = scpsys_sram_disable(pd);
 		if (ret < 0)
 			return ret;
@@ -781,7 +821,7 @@ static int scpsys_power_off_internal(struct scpsys_domain *pd)
 		ret = scpsys_modem_pwrseq_off(pd);
 	else if (MTK_SCPD_CAPS(pd, MTK_SCPD_SIMPLE_PWRSEQ))
 		ret = scpsys_simple_pwrseq_off(pd);
-	else
+	else if (!MTK_SCPD_CAPS(pd, MTK_SCPD_MODEM_SECURE_PWRSEQ))
 		ret = scpsys_ctl_pwrseq_off(pd);
 
 	if (ret < 0) {
diff --git a/drivers/pmdomain/mediatek/mtk-pm-domains.h b/drivers/pmdomain/mediatek/mtk-pm-domains.h
index 092403de66fa..8690690335ad 100644
--- a/drivers/pmdomain/mediatek/mtk-pm-domains.h
+++ b/drivers/pmdomain/mediatek/mtk-pm-domains.h
@@ -18,6 +18,7 @@
 #define MTK_SCPD_SKIP_RESET_B		BIT(11)
 #define MTK_SCPD_INFRA_PWR_CTL		BIT(12)
 #define MTK_SCPD_SIMPLE_PWRSEQ		BIT(13)
+#define MTK_SCPD_MODEM_SECURE_PWRSEQ	BIT(14)
 #define MTK_SCPD_CAPS(_scpd, _x)	((_scpd)->data ?		\
 					 (_scpd)->data->caps & (_x) :	\
 					 (_scpd)->hwv_data->caps & (_x))
diff --git a/include/linux/soc/mediatek/mtk_sip_svc.h b/include/linux/soc/mediatek/mtk_sip_svc.h
index abe24a73ee19..6c95a29b79fa 100644
--- a/include/linux/soc/mediatek/mtk_sip_svc.h
+++ b/include/linux/soc/mediatek/mtk_sip_svc.h
@@ -22,6 +22,9 @@
 	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, MTK_SIP_SMC_CONVENTION, \
 			   ARM_SMCCC_OWNER_SIP, fn_id)
 
+/* Modem related SMC call */
+#define MTK_SIP_KERNEL_CCCI_CONTROL	MTK_SIP_SMC_CMD(0x505)
+
 /* DVFSRC SMC calls */
 #define MTK_SIP_DVFSRC_VCOREFS_CONTROL	MTK_SIP_SMC_CMD(0x506)