drivers/video/tegra/dc/clock.c

/*
 * drivers/video/tegra/dc/clock.c
 *
 * Copyright (C) 2010 Google, Inc.
 *
 * Copyright (c) 2010-2014, NVIDIA CORPORATION, All rights reserved.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/err.h>
#include <linux/types.h>
#include <linux/clk.h>
#include <linux/clk/tegra.h>

#include <mach/dc.h>

#include "dc_reg.h"
#include "dc_priv.h"

unsigned long tegra_dc_pclk_round_rate(struct tegra_dc *dc, int pclk)
{
	unsigned long rate;
	unsigned long div;

	rate = tegra_dc_clk_get_rate(dc);

	if (TEGRA_DC_OUT_DSI == dc->out->type)
		div = DIV_ROUND_CLOSEST(rate * 2, pclk);
	else  /* round-up for divider for other display types */
		div = DIV_ROUND_UP(rate * 2, pclk);

	if (div < 2)
		return 0;

	return rate * 2 / div;
}

unsigned long tegra_dc_pclk_predict_rate(
	int out_type, struct clk *parent, int pclk)
{
	unsigned long rate;
	unsigned long div;

	rate = clk_get_rate(parent);

	if (TEGRA_DC_OUT_DSI == out_type)
		div = DIV_ROUND_CLOSEST(rate * 2, pclk);
	else  /* round-up for divider for other display types */
		div = DIV_ROUND_UP(rate * 2, pclk);

	if (div < 2)
		return 0;

	return rate * 2 / div;
}

void tegra_dc_setup_clk(struct tegra_dc *dc, struct clk *clk)
{
	int pclk;

	if (dc->out_ops->setup_clk)
		pclk = dc->out_ops->setup_clk(dc, clk);
	else
		pclk = 0;

	WARN_ONCE(!pclk, "pclk is 0\n");
	tegra_dvfs_set_rate(clk, pclk);
}