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Commit 70335921 authored by Mike Tipton's avatar Mike Tipton
Browse files

clk: qcom: Add common runtime_pm support 



Add common runtime_pm initialization and callback functions to allow
clock providers to vote clocks, interconnects, and regulators in
runtime_suspend and runtime_resume.

Change-Id: I97588feae47016b8375849c5926495c1d73f792d
Signed-off-by: default avatarMike Tipton <mdtipton@codeaurora.org>
parent 2ac873fb

drivers/clk/qcom/common.c

+123 −0
Original line number Diff line number Diff line
@@ -12,6 +12,10 @@ 
#include <linux/reset-controller.h>

#include <linux/of.h>

#include <linux/clk/qcom.h>

#include <linux/clk.h>

#include <linux/interconnect.h>

#include <linux/pm_clock.h>

#include <linux/pm_runtime.h>



#include "common.h"

#include "clk-opp.h"
@@ -394,4 +398,123 @@ int qcom_clk_get_voltage(struct clk *clk, unsigned long rate) 
}

EXPORT_SYMBOL(qcom_clk_get_voltage);



int qcom_cc_runtime_init(struct platform_device *pdev,

			 struct qcom_cc_desc *desc)

{

	struct device *dev = &pdev->dev;

	struct clk *clk;

	int ret;



	clk = clk_get_optional(dev, "iface");

	if (IS_ERR(clk)) {

		if (PTR_ERR(clk) != -EPROBE_DEFER)

			dev_err(dev, "unable to get iface clock\n");

		return PTR_ERR(clk);

	}

	clk_put(clk);



	ret = clk_regulator_init(dev, desc);

	if (ret)

		return ret;



	desc->path = of_icc_get(dev, NULL);

	if (IS_ERR(desc->path)) {

		if (PTR_ERR(desc->path) != -EPROBE_DEFER)

			dev_err(dev, "error getting path\n");

		return PTR_ERR(desc->path);

	}



	platform_set_drvdata(pdev, desc);

	pm_runtime_enable(dev);



	ret = pm_clk_create(dev);

	if (ret)

		goto disable_pm_runtime;



	ret = pm_clk_add(dev, "iface");

	if (ret < 0) {

		dev_err(dev, "failed to acquire iface clock\n");

		goto destroy_pm_clk;

	}



	return 0;



destroy_pm_clk:

	pm_clk_destroy(dev);



disable_pm_runtime:

	pm_runtime_disable(dev);

	icc_put(desc->path);



	return ret;

}

EXPORT_SYMBOL(qcom_cc_runtime_init);



int qcom_cc_runtime_resume(struct device *dev)

{

	struct qcom_cc_desc *desc = dev_get_drvdata(dev);

	struct clk_vdd_class_data vdd_data = {0};

	int ret;

	int i;



	for (i = 0; i < desc->num_clk_regulators; i++) {

		vdd_data.vdd_class = desc->clk_regulators[i];

		if (!vdd_data.vdd_class)

			continue;



		ret = clk_vote_vdd_level(&vdd_data, 1);

		if (ret) {

			dev_warn(dev, "%s: failed to vote voltage\n", __func__);

			return ret;

		}

	}



	if (desc->path) {

		ret = icc_set_bw(desc->path, 0, 1);

		if (ret) {

			dev_warn(dev, "%s: failed to vote bw\n", __func__);

			return ret;

		}

	}



	ret = pm_clk_resume(dev);

	if (ret)

		dev_warn(dev, "%s: failed to enable clocks\n", __func__);



	return ret;

}

EXPORT_SYMBOL(qcom_cc_runtime_resume);



int qcom_cc_runtime_suspend(struct device *dev)

{

	struct qcom_cc_desc *desc = dev_get_drvdata(dev);

	struct clk_vdd_class_data vdd_data = {0};

	int ret;

	int i;



	ret = pm_clk_suspend(dev);

	if (ret)

		dev_warn(dev, "%s: failed to disable clocks\n", __func__);



	if (desc->path) {

		ret = icc_set_bw(desc->path, 0, 0);

		if (ret)

			dev_warn(dev, "%s: failed to unvote bw\n", __func__);

	}



	for (i = 0; i < desc->num_clk_regulators; i++) {

		vdd_data.vdd_class = desc->clk_regulators[i];

		if (!vdd_data.vdd_class)

			continue;



		ret = clk_unvote_vdd_level(&vdd_data, 1);

		if (ret)

			dev_warn(dev, "%s: failed to unvote voltage\n",

				 __func__);

	}



	return 0;

}

EXPORT_SYMBOL(qcom_cc_runtime_suspend);



MODULE_LICENSE("GPL v2");

drivers/clk/qcom/common.h

+7 −0
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ struct qcom_cc_desc { 
	size_t num_clk_hws;

	struct clk_vdd_class **clk_regulators;

	size_t num_clk_regulators;

	struct icc_path *path;

};



/**
@@ -77,4 +78,10 @@ extern int qcom_cc_probe_by_index(struct platform_device *pdev, int index, 
				  const struct qcom_cc_desc *desc);

extern const struct clk_ops clk_dummy_ops;

void qcom_cc_sync_state(struct device *dev, const struct qcom_cc_desc *desc);



int qcom_cc_runtime_init(struct platform_device *pdev,

			 struct qcom_cc_desc *desc);

int qcom_cc_runtime_suspend(struct device *dev);

int qcom_cc_runtime_resume(struct device *dev);



#endif

drivers/clk/qcom/vdd-class.c

+3 −0
Original line number Diff line number Diff line
@@ -197,6 +197,9 @@ int clk_regulator_init(struct device *dev, const struct qcom_cc_desc *desc) 
		vdd_class = desc->clk_regulators[i];



		for (cnt = 0; cnt < vdd_class->num_regulators; cnt++) {

			if (vdd_class->regulator[cnt])

				continue;



			name = vdd_class->regulator_names[cnt];

			regulator = devm_regulator_get(dev, name);

			if (IS_ERR(regulator)) {