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Commit cd272994 authored by Naveen Yadav's avatar Naveen Yadav
Browse files

PM / devfreq: Add support to print l3 domain debug regs 



Add notifier support for devfreq hardware to print debug
registers for L3 domain during crash.

Change-Id: I955bdb906ebd92106f27c4b4efd1366eebaefc43
Signed-off-by: default avatarNaveen Yadav <naveenky@codeaurora.org>
parent b776547b

drivers/devfreq/devfreq_qcom_fw.c

+46 −1
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.

 * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved.

 */



#include <linux/err.h>
@@ -29,6 +29,7 @@ 


struct devfreq_qcom_fw {

	void __iomem *perf_base;

	void __iomem *pstate_base;

	struct devfreq_dev_profile dp;

	struct list_head voters;

	struct list_head voter;
@@ -37,6 +38,7 @@ struct devfreq_qcom_fw { 


static DEFINE_SPINLOCK(voter_lock);

static unsigned int ftbl_row_size = FTBL_ROW_SIZE;

static struct device *dev_node;



static int devfreq_qcom_fw_target(struct device *dev, unsigned long *freq,

				  u32 flags)
@@ -80,6 +82,26 @@ static int devfreq_qcom_fw_target(struct device *dev, unsigned long *freq, 
	return 0;

}



static int devfreq_panic_callback(struct notifier_block *nfb,

					unsigned long event, void *unused)

{

	struct devfreq_qcom_fw *d = dev_get_drvdata(dev_node);

	void __iomem *base;



	pr_err("%s: L3-DOMAIN\n", __func__);

	base = d->perf_base;

	pr_err("%25s: 0x%.8x\n", "PERF_STATE_DESIRED", readl_relaxed(base));

	base = d->pstate_base;

	pr_err("%25s: 0x%.8x\n", "PSTATE_STATUS", readl_relaxed(base));



	return NOTIFY_OK;

}



static struct notifier_block devfreq_panic_notifier = {

	.notifier_call = devfreq_panic_callback,

	.priority = 1,

};



static int devfreq_qcom_fw_get_cur_freq(struct device *dev,

						 unsigned long *freq)

{
@@ -197,6 +219,29 @@ static int devfreq_qcom_init_hw(struct platform_device *pdev) 
		goto out;

	}



	if (of_property_read_bool(dev->of_node,

					"qcom,support-panic-notifier")) {

		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,

								"pstate-base");

		if (!res) {

			dev_err(dev, "Unable to find pstate-base!\n");

			ret = -EINVAL;

			goto out;

		}



		d->pstate_base = devm_ioremap(dev, res->start,

							resource_size(res));

		if (!d->pstate_base) {

			dev_err(dev, "Unable to map pstate-base\n");

			ret = -ENOMEM;

			goto out;

		}



		atomic_notifier_chain_register(&panic_notifier_list,

						&devfreq_panic_notifier);

		dev_node = dev;

	}



	INIT_LIST_HEAD(&d->voters);

	dev_set_drvdata(dev, d);