diff --git a/drivers/firmware/qcom_scm-smc.c b/drivers/firmware/qcom_scm-smc.c
index d111833364ba..385615d76e94 100644
--- a/drivers/firmware/qcom_scm-smc.c
+++ b/drivers/firmware/qcom_scm-smc.c
@@ -52,29 +52,108 @@ static void __scm_smc_do_quirk(const struct arm_smccc_args *smc,
 	} while (res->a0 == QCOM_SCM_INTERRUPTED);
 }
 
-static void __scm_smc_do(const struct arm_smccc_args *smc,
-			 struct arm_smccc_res *res, bool atomic)
+static void fill_wq_resume_args(struct arm_smccc_args *resume, u32 smc_call_ctx)
 {
-	int retry_count = 0;
+	memset(resume->args, 0, sizeof(resume->args[0]) * ARRAY_SIZE(resume->args));
+
+	resume->args[0] = ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL,
+					ARM_SMCCC_SMC_64, ARM_SMCCC_OWNER_SIP,
+					SCM_SMC_FNID(QCOM_SCM_SVC_WAITQ, QCOM_SCM_WAITQ_RESUME));
+
+	resume->args[1] = QCOM_SCM_ARGS(1);
+
+	resume->args[2] = smc_call_ctx;
+}
+
+int scm_get_wq_ctx(u32 *wq_ctx, u32 *flags, u32 *more_pending)
+{
+	int ret;
+	struct arm_smccc_args get_wq_ctx = {0};
+	struct arm_smccc_res get_wq_res;
+
+	get_wq_ctx.args[0] = ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL,
+				ARM_SMCCC_SMC_64, ARM_SMCCC_OWNER_SIP,
+				SCM_SMC_FNID(QCOM_SCM_SVC_WAITQ, QCOM_SCM_WAITQ_GET_WQ_CTX));
+
+	/* Guaranteed to return only success or error, no WAITQ_* */
+	__scm_smc_do_quirk(&get_wq_ctx, &get_wq_res);
+	ret = get_wq_res.a0;
+	if (ret)
+		return ret;
+
+	*wq_ctx = get_wq_res.a1;
+	*flags  = get_wq_res.a2;
+	*more_pending = get_wq_res.a3;
+
+	return 0;
+}
+
+static int __scm_smc_do_quirk_handle_waitq(struct device *dev, struct arm_smccc_args *waitq,
+					   struct arm_smccc_res *res)
+{
+	struct qcom_scm *scm;
+	struct completion *wq = NULL;
+	struct arm_smccc_args resume;
+	u32 wq_ctx, smc_call_ctx, flags;
+	struct arm_smccc_args *smc = waitq;
+
+	do {
+		__scm_smc_do_quirk(smc, res);
+
+		if (res->a0 == QCOM_SCM_WAITQ_SLEEP) {
+			wq_ctx = res->a1;
+			smc_call_ctx = res->a2;
+			flags = res->a3;
+
+			if (!dev)
+				return -EPROBE_DEFER;
+
+			scm = dev_get_drvdata(dev);
+			wq = qcom_scm_lookup_wq(scm, wq_ctx);
+			if (IS_ERR_OR_NULL(wq)) {
+				dev_err(dev, "No waitqueue found for wq_ctx %d: %ld\n",
+					wq_ctx, PTR_ERR(wq));
+				return PTR_ERR(wq) ? : -EINVAL;
+			}
+
+			wait_for_completion(wq);
+			fill_wq_resume_args(&resume, smc_call_ctx);
+			smc = &resume;
+			wq = NULL;
+		}
+	} while (res->a0 == QCOM_SCM_WAITQ_SLEEP);
+
+	return 0;
+}
+
+static int __scm_smc_do(struct device *dev, struct arm_smccc_args *smc,
+			struct arm_smccc_res *res, bool atomic)
+{
+	int ret, retry_count = 0;
 
 	if (atomic) {
 		__scm_smc_do_quirk(smc, res);
-		return;
+		return 0;
 	}
 
 	do {
 		mutex_lock(&qcom_scm_lock);
 
-		__scm_smc_do_quirk(smc, res);
+		ret = __scm_smc_do_quirk_handle_waitq(dev, smc, res);
 
 		mutex_unlock(&qcom_scm_lock);
 
+		if (ret)
+			return ret;
+
 		if (res->a0 == QCOM_SCM_V2_EBUSY) {
 			if (retry_count++ > QCOM_SCM_EBUSY_MAX_RETRY)
 				break;
 			msleep(QCOM_SCM_EBUSY_WAIT_MS);
 		}
 	}  while (res->a0 == QCOM_SCM_V2_EBUSY);
+
+	return 0;
 }
 
 
@@ -83,7 +162,7 @@ int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc,
 		   struct qcom_scm_res *res, bool atomic)
 {
 	int arglen = desc->arginfo & 0xf;
-	int i;
+	int i, ret;
 	dma_addr_t args_phys = 0;
 	void *args_virt = NULL;
 	size_t alloc_len;
@@ -135,13 +214,17 @@ int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc,
 		smc.args[SCM_SMC_LAST_REG_IDX] = args_phys;
 	}
 
-	__scm_smc_do(&smc, &smc_res, atomic);
+	/* ret error check follows after args_virt cleanup*/
+	ret = __scm_smc_do(dev, &smc, &smc_res, atomic);
 
 	if (args_virt) {
 		dma_unmap_single(dev, args_phys, alloc_len, DMA_TO_DEVICE);
 		kfree(args_virt);
 	}
 
+	if (ret)
+		return ret;
+
 	if (res) {
 		res->result[0] = smc_res.a1;
 		res->result[1] = smc_res.a2;
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index cdbfe54c8146..89de6dd7567d 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -3,7 +3,9 @@
  * Copyright (C) 2015 Linaro Ltd.
  */
 #include <linux/platform_device.h>
+#include <linux/idr.h>
 #include <linux/init.h>
+#include <linux/interrupt.h>
 #include <linux/cpumask.h>
 #include <linux/export.h>
 #include <linux/dma-mapping.h>
@@ -13,9 +15,12 @@
 #include <linux/qcom_scm.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/clk.h>
 #include <linux/reset-controller.h>
+#include <linux/spinlock.h>
+#include <linux/ktime.h>
 #include <linux/arm-smccc.h>
 
 #include "qcom_scm.h"
@@ -27,12 +32,20 @@ module_param(download_mode, bool, 0);
 #define SCM_HAS_IFACE_CLK	BIT(1)
 #define SCM_HAS_BUS_CLK		BIT(2)
 
+struct qcom_scm_waitq {
+	struct idr idr;
+	/* control access to IDR */
+	spinlock_t idr_lock;
+	struct completion waitq_comp;
+};
+
 struct qcom_scm {
 	struct device *dev;
 	struct clk *core_clk;
 	struct clk *iface_clk;
 	struct clk *bus_clk;
 	struct icc_path *path;
+	struct qcom_scm_waitq waitq;
 	struct reset_controller_dev reset;
 
 	/* control access to the interconnect path */
@@ -63,6 +76,9 @@ static const u8 qcom_scm_cpu_warm_bits[QCOM_SCM_BOOT_MAX_CPUS] = {
 	BIT(2), BIT(1), BIT(4), BIT(6)
 };
 
+#define QCOM_SMC_WAITQ_FLAG_WAKE_ONE	BIT(0)
+#define QCOM_SMC_WAITQ_FLAG_WAKE_ALL	BIT(1)
+
 static const char * const qcom_scm_convention_names[] = {
 	[SMC_CONVENTION_UNKNOWN] = "unknown",
 	[SMC_CONVENTION_ARM_32] = "smc arm 32",
@@ -1325,11 +1341,82 @@ bool qcom_scm_is_available(void)
 }
 EXPORT_SYMBOL(qcom_scm_is_available);
 
+struct completion *qcom_scm_lookup_wq(struct qcom_scm *scm, u32 wq_ctx)
+{
+	int err;
+	unsigned long flags;
+	u32 wq_ctx_idr = wq_ctx;
+	struct completion *wq = NULL;
+
+	spin_lock_irqsave(&scm->waitq.idr_lock, flags);
+	wq = idr_find(&scm->waitq.idr, wq_ctx);
+	if (wq)
+		goto out;
+
+	wq = &scm->waitq.waitq_comp;
+
+	err = idr_alloc_u32(&scm->waitq.idr, wq, &wq_ctx_idr,
+			    U32_MAX, GFP_ATOMIC);
+	if (err < 0)
+		wq = ERR_PTR(err);
+
+out:
+	spin_unlock_irqrestore(&scm->waitq.idr_lock, flags);
+	return wq;
+}
+
+static int qcom_scm_waitq_wakeup(struct qcom_scm *scm, unsigned int wq_ctx, bool wake_all)
+{
+	struct completion *wq_to_wake;
+
+	wq_to_wake = qcom_scm_lookup_wq(scm, wq_ctx);
+	if (IS_ERR_OR_NULL(wq_to_wake)) {
+		dev_err(scm->dev, "No waitqueue found for wq_ctx %d: %ld\n",
+			wq_ctx, PTR_ERR(wq_to_wake));
+		return PTR_ERR(wq_to_wake) ? : -EINVAL;
+	}
+
+	if (wake_all)
+		complete_all(wq_to_wake);
+	else
+		complete(wq_to_wake);
+
+	return 0;
+}
+
+static irqreturn_t qcom_scm_irq_handler(int irq, void *data)
+{
+	int ret;
+	struct qcom_scm *scm = data;
+	u32 wq_ctx, flags, more_pending = 0;
+
+	do {
+		ret = scm_get_wq_ctx(&wq_ctx, &flags, &more_pending);
+		if (ret) {
+			dev_err(scm->dev, "GET_WQ_CTX SMC call failed: %d\n", ret);
+			goto out;
+		}
+
+		if (flags != QCOM_SMC_WAITQ_FLAG_WAKE_ONE &&
+		    flags != QCOM_SMC_WAITQ_FLAG_WAKE_ALL) {
+			dev_err(scm->dev, "Invalid flags found for wq_ctx: %u\n", flags);
+			goto out;
+		}
+
+		ret = qcom_scm_waitq_wakeup(scm, wq_ctx, !!(flags & QCOM_SMC_WAITQ_FLAG_WAKE_ALL));
+		if (ret)
+			goto out;
+	} while (more_pending);
+
+out:
+	return IRQ_HANDLED;
+}
+
 static int qcom_scm_probe(struct platform_device *pdev)
 {
 	struct qcom_scm *scm;
 	unsigned long clks;
-	int ret;
+	int irq, ret;
 
 	scm = devm_kzalloc(&pdev->dev, sizeof(*scm), GFP_KERNEL);
 	if (!scm)
@@ -1399,9 +1486,28 @@ static int qcom_scm_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	platform_set_drvdata(pdev, scm);
+
 	__scm = scm;
 	__scm->dev = &pdev->dev;
 
+	spin_lock_init(&__scm->waitq.idr_lock);
+	idr_init(&__scm->waitq.idr);
+	init_completion(&__scm->waitq.waitq_comp);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		if (irq != -ENXIO)
+			return irq;
+	} else {
+		ret = devm_request_threaded_irq(__scm->dev, irq, NULL, qcom_scm_irq_handler,
+						IRQF_ONESHOT, "qcom-scm", __scm);
+		if (ret < 0) {
+			idr_destroy(&__scm->waitq.idr);
+			return dev_err_probe(scm->dev, ret, "Failed to request qcom-scm irq\n");
+		}
+	}
+
 	__get_convention();
 
 	/*
@@ -1417,6 +1523,12 @@ static int qcom_scm_probe(struct platform_device *pdev)
 
 static void qcom_scm_shutdown(struct platform_device *pdev)
 {
+	unsigned long flags;
+
+	spin_lock_irqsave(&__scm->waitq.idr_lock, flags);
+	idr_destroy(&__scm->waitq.idr);
+	spin_unlock_irqrestore(&__scm->waitq.idr_lock, flags);
+
 	/* Clean shutdown, disable download mode to allow normal restart */
 	if (download_mode)
 		qcom_scm_set_download_mode(false);
diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
index db3d08a01209..d1e9e8269692 100644
--- a/drivers/firmware/qcom_scm.h
+++ b/drivers/firmware/qcom_scm.h
@@ -60,6 +60,10 @@ struct qcom_scm_res {
 	u64 result[MAX_QCOM_SCM_RETS];
 };
 
+struct qcom_scm;
+struct completion *qcom_scm_lookup_wq(struct qcom_scm *scm, u32 wq_ctx);
+int scm_get_wq_ctx(u32 *wq_ctx, u32 *flags, u32 *more_pending);
+
 #define SCM_SMC_FNID(s, c)	((((s) & 0xFF) << 8) | ((c) & 0xFF))
 extern int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc,
 			  enum qcom_scm_convention qcom_convention,
@@ -129,6 +133,10 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc,
 #define QCOM_SCM_SMMU_CONFIG_ERRATA1		0x03
 #define QCOM_SCM_SMMU_CONFIG_ERRATA1_CLIENT_ALL	0x02
 
+#define QCOM_SCM_SVC_WAITQ			0x24
+#define QCOM_SCM_WAITQ_RESUME			0x02
+#define QCOM_SCM_WAITQ_GET_WQ_CTX		0x03
+
 /* common error codes */
 #define QCOM_SCM_V2_EBUSY	-12
 #define QCOM_SCM_ENOMEM		-5
@@ -137,6 +145,7 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc,
 #define QCOM_SCM_EINVAL_ARG	-2
 #define QCOM_SCM_ERROR		-1
 #define QCOM_SCM_INTERRUPTED	1
+#define QCOM_SCM_WAITQ_SLEEP	2
 
 static inline int qcom_scm_remap_error(int err)
 {
