Some firmware versions support the handling of multiple SCM calls at the
same time. Add a device tree boolean property which, when specified,
allows this to happen.
Signed-off-by: Guru Das Srinagesh <quic_gurus@xxxxxxxxxxx>
---
drivers/firmware/qcom_scm-smc.c | 8 ++++++--
drivers/firmware/qcom_scm.c | 6 ++++++
drivers/firmware/qcom_scm.h | 2 ++
3 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/qcom_scm-smc.c b/drivers/firmware/qcom_scm-smc.c
index d111833..66193c2 100644
--- a/drivers/firmware/qcom_scm-smc.c
+++ b/drivers/firmware/qcom_scm-smc.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2015,2019 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <linux/io.h>
@@ -63,11 +64,14 @@ static void __scm_smc_do(const struct arm_smccc_args *smc,
}
do {
- mutex_lock(&qcom_scm_lock);
+ if (!qcom_scm_allow_multicall)
+ mutex_lock(&qcom_scm_lock);
__scm_smc_do_quirk(smc, res);
- mutex_unlock(&qcom_scm_lock);
+ if (!qcom_scm_allow_multicall)
+ mutex_unlock(&qcom_scm_lock);
+
if (res->a0 == QCOM_SCM_V2_EBUSY) {
if (retry_count++ > QCOM_SCM_EBUSY_MAX_RETRY)
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index cdbfe54..978706a 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2010,2015,2019 The Linux Foundation. All rights reserved.
* Copyright (C) 2015 Linaro Ltd.
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <linux/platform_device.h>
#include <linux/init.h>
@@ -23,6 +24,8 @@
static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT);
module_param(download_mode, bool, 0);
+bool qcom_scm_allow_multicall = false;
+
#define SCM_HAS_CORE_CLK BIT(0)
#define SCM_HAS_IFACE_CLK BIT(1)
#define SCM_HAS_BUS_CLK BIT(2)
@@ -1402,6 +1405,9 @@ static int qcom_scm_probe(struct platform_device *pdev)
__scm = scm;
__scm->dev = &pdev->dev;
+ qcom_scm_allow_multicall = of_property_read_bool(__scm->dev->of_node,
+ "allow-multi-call");
+
__get_convention();
/*
diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
index 0d51eef..c0a4d6b 100644
--- a/drivers/firmware/qcom_scm.h
+++ b/drivers/firmware/qcom_scm.h
@@ -1,5 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (c) 2010-2015,2019 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#ifndef __QCOM_SCM_INT_H
#define __QCOM_SCM_INT_H
@@ -12,6 +13,7 @@ enum qcom_scm_convention {
};
extern enum qcom_scm_convention qcom_scm_convention;
+extern bool qcom_scm_allow_multicall;
#define MAX_QCOM_SCM_ARGS 10
#define MAX_QCOM_SCM_RETS 3
--
2.7.4
