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Commit d849dbe3 authored by Naveen Yadav's avatar Naveen Yadav
Browse files

cpufreq: qcom-hw: Add support to print cpufreq hardware debug regs 



Add notifier support for cpufreq hardware to print debug registers
during crash.

Change-Id: I52e01ee4d28dc49bb9ef4084adc2fb1326779dd2
Signed-off-by: default avatarNaveen Yadav <naveenky@codeaurora.org>
parent 2a9722b0

drivers/cpufreq/qcom-cpufreq-hw-debug.c

+33 −0
Original line number Diff line number Diff line
@@ -443,6 +443,35 @@ static const struct file_operations cpufreq_debug_register_fops = { 
	.release = seq_release,

};



static int cpufreq_panic_callback(struct notifier_block *nfb,

					unsigned long event, void *unused)

{

	int i, j;

	u32 regval;



	static struct cpufreq_register_data data[] = {

		{"PERF_STATE_DESIRED", REG_PERF_STATE},

		{"CYCLE_CNTR_VAL", REG_CYCLE_CNTR},

		{"PSTATE_STATUS", REG_PSTATE_STATUS},

	};



	for (i = 0; i < hw_regs->domain_cnt; i++) {

		pr_err("FREQUENCY DOMAIN %d\n", i);

		for (j = 0; j < ARRAY_SIZE(data); j++) {

			regval = readl_relaxed(hw_regs->base[i] +

						offsets[data[j].offset]);

			pr_err("%25s: 0x%.8x\n", data[j].name, regval);

		}

	}



	return NOTIFY_OK;

}



static struct notifier_block cpufreq_panic_notifier = {

	.notifier_call = cpufreq_panic_callback,

	.priority = 1,

};



static int cpufreq_get_hwregs(struct platform_device *pdev)

{

	struct of_phandle_args args;
@@ -479,6 +508,10 @@ static int cpufreq_get_hwregs(struct platform_device *pdev) 


		hw_regs->base[i] = base;

	}



	atomic_notifier_chain_register(&panic_notifier_list,

						&cpufreq_panic_notifier);



	return 0;

}