drivers/gpu/drm/msm/dp/dp_clk_util.c

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2012-2015, 2017-2018, The Linux Foundation.
 * All rights reserved.
 */

#include <linux/clk.h>
#include <linux/clk/clk-conf.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/of.h>

#include <drm/drm_print.h>

#include "dp_clk_util.h"

void msm_dss_put_clk(struct dss_clk *clk_arry, int num_clk)
{
	int i;

	for (i = num_clk - 1; i >= 0; i--) {
		if (clk_arry[i].clk)
			clk_put(clk_arry[i].clk);
		clk_arry[i].clk = NULL;
	}
}

int msm_dss_get_clk(struct device *dev, struct dss_clk *clk_arry, int num_clk)
{
	int i, rc = 0;

	for (i = 0; i < num_clk; i++) {
		clk_arry[i].clk = clk_get(dev, clk_arry[i].clk_name);
		rc = PTR_ERR_OR_ZERO(clk_arry[i].clk);
		if (rc) {
			DEV_ERR("%pS->%s: '%s' get failed. rc=%d\n",
				__builtin_return_address(0), __func__,
				clk_arry[i].clk_name, rc);
			goto error;
		}
	}

	return rc;

error:
	for (i--; i >= 0; i--) {
		if (clk_arry[i].clk)
			clk_put(clk_arry[i].clk);
		clk_arry[i].clk = NULL;
	}

	return rc;
}

int msm_dss_clk_set_rate(struct dss_clk *clk_arry, int num_clk)
{
	int i, rc = 0;

	for (i = 0; i < num_clk; i++) {
		if (clk_arry[i].clk) {
			if (clk_arry[i].type != DSS_CLK_AHB) {
				DEV_DBG("%pS->%s: '%s' rate %ld\n",
					__builtin_return_address(0), __func__,
					clk_arry[i].clk_name,
					clk_arry[i].rate);
				rc = clk_set_rate(clk_arry[i].clk,
					clk_arry[i].rate);
				if (rc) {
					DEV_ERR("%pS->%s: %s failed. rc=%d\n",
						__builtin_return_address(0),
						__func__,
						clk_arry[i].clk_name, rc);
					break;
				}
			}
		} else {
			DEV_ERR("%pS->%s: '%s' is not available\n",
				__builtin_return_address(0), __func__,
				clk_arry[i].clk_name);
			rc = -EPERM;
			break;
		}
	}

	return rc;
}

int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable)
{
	int i, rc = 0;

	if (enable) {
		for (i = 0; i < num_clk; i++) {
			DEV_DBG("%pS->%s: enable '%s'\n",
				__builtin_return_address(0), __func__,
				clk_arry[i].clk_name);
			rc = clk_prepare_enable(clk_arry[i].clk);
			if (rc)
				DEV_ERR("%pS->%s: %s en fail. rc=%d\n",
					__builtin_return_address(0),
					__func__,
					clk_arry[i].clk_name, rc);

			if (rc && i) {
				msm_dss_enable_clk(&clk_arry[i - 1],
					i - 1, false);
				break;
			}
		}
	} else {
		for (i = num_clk - 1; i >= 0; i--) {
			DEV_DBG("%pS->%s: disable '%s'\n",
				__builtin_return_address(0), __func__,
				clk_arry[i].clk_name);

			clk_disable_unprepare(clk_arry[i].clk);
		}
	}

	return rc;
}