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Commit 7e42a5f1 authored by Odelu Kukatla's avatar Odelu Kukatla Committed by Dhaval Patel
Browse files

msm: msm_bus: Add proxy bus client driver 



Add a proxy client driver which can be used to cast a proxy
bandwidth vote during boot up for a critical resource which
is removed at the end of boot. This is required to ensure
that a certain minimum state for a critical resource at the
beginning of boot up before the clients have probed and voted
for required state.

Change-Id: I34638c458604231a68b926bbe5110dcf96162352
Signed-off-by: default avatarOdelu Kukatla <okukatla@codeaurora.org>
Signed-off-by: default avatarDhaval Patel <pdhaval@codeaurora.org>
parent 1f8fb727

drivers/soc/qcom/msm_bus/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -8,7 +8,7 @@ obj-$(CONFIG_MSM_RPM_SMD) += msm_bus_rpm_smd.o 


ifdef CONFIG_QCOM_BUS_CONFIG_RPMH

	obj-y += msm_bus_fabric_rpmh.o msm_bus_arb_rpmh.o msm_bus_rules.o \

		msm_bus_bimc_rpmh.o msm_bus_noc_rpmh.o

		msm_bus_bimc_rpmh.o msm_bus_noc_rpmh.o msm_bus_proxy_client.o

	obj-$(CONFIG_OF) += msm_bus_of_rpmh.o

else

	obj-y += msm_bus_fabric_adhoc.o msm_bus_arb_adhoc.o msm_bus_rules.o \

drivers/soc/qcom/msm_bus/msm_bus_proxy_client.c

0 → 100644
+85 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.

 */



#include <linux/msm-bus.h>



struct proxy_client {

	struct msm_bus_scale_pdata *pdata;

	unsigned int client_handle;

};



static struct proxy_client proxy_client_info;



static int msm_bus_device_proxy_client_probe(struct platform_device *pdev)

{

	int ret;



	proxy_client_info.pdata = msm_bus_cl_get_pdata(pdev);



	if (!proxy_client_info.pdata)

		return 0;



	proxy_client_info.client_handle =

		msm_bus_scale_register_client(proxy_client_info.pdata);



	if (!proxy_client_info.client_handle) {

		dev_err(&pdev->dev, "Unable to register bus client\n");

		return -ENODEV;

	}



	ret = msm_bus_scale_client_update_request(

					proxy_client_info.client_handle, 1);

	if (ret)

		dev_err(&pdev->dev, "Bandwidth update failed (%d)\n", ret);



	return ret;

}



static const struct of_device_id proxy_client_match[] = {

	{.compatible = "qcom,bus-proxy-client"},

	{}

};



static struct platform_driver msm_bus_proxy_client_driver = {

	.probe = msm_bus_device_proxy_client_probe,

	.driver = {

		.name = "msm_bus_proxy_client_device",

		.of_match_table = proxy_client_match,

	},

};



static int __init msm_bus_proxy_client_init_driver(void)

{

	int rc;



	rc =  platform_driver_register(&msm_bus_proxy_client_driver);

	if (rc) {

		pr_err("Failed to register proxy client device driver\n");

		return rc;

	}



	return rc;

}



static int __init msm_bus_proxy_client_unvote(void)

{

	int ret;



	if (!proxy_client_info.pdata || !proxy_client_info.client_handle)

		return 0;



	ret = msm_bus_scale_client_update_request(

					proxy_client_info.client_handle, 0);

	if (ret)

		pr_err("%s: bandwidth update request failed (%d)\n",

			__func__, ret);



	msm_bus_scale_unregister_client(proxy_client_info.client_handle);



	return 0;

}



subsys_initcall_sync(msm_bus_proxy_client_init_driver);

late_initcall_sync(msm_bus_proxy_client_unvote);