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/*
* 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);
}
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