Release 4.15 drivers/gpu/drm/msm/mdp/mdp4/mdp4_lvds_pll.c
/*
* Copyright (C) 2014 Red Hat
* Author: Rob Clark <robdclark@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* 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.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include "mdp4_kms.h"
struct mdp4_lvds_pll {
struct clk_hw pll_hw;
struct drm_device *dev;
unsigned long pixclk;
};
#define to_mdp4_lvds_pll(x) container_of(x, struct mdp4_lvds_pll, pll_hw)
static struct mdp4_kms *get_kms(struct mdp4_lvds_pll *lvds_pll)
{
struct msm_drm_private *priv = lvds_pll->dev->dev_private;
return to_mdp4_kms(to_mdp_kms(priv->kms));
}
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struct pll_rate {
unsigned long rate;
struct {
uint32_t val;
uint32_t reg;
} conf[32];
};
/* NOTE: keep sorted highest freq to lowest: */
static const struct pll_rate freqtbl[] = {
{ 72000000, {
{ 0x8f, REG_MDP4_LVDS_PHY_PLL_CTRL_1 },
{ 0x30, REG_MDP4_LVDS_PHY_PLL_CTRL_2 },
{ 0xc6, REG_MDP4_LVDS_PHY_PLL_CTRL_3 },
{ 0x10, REG_MDP4_LVDS_PHY_PLL_CTRL_5 },
{ 0x07, REG_MDP4_LVDS_PHY_PLL_CTRL_6 },
{ 0x62, REG_MDP4_LVDS_PHY_PLL_CTRL_7 },
{ 0x41, REG_MDP4_LVDS_PHY_PLL_CTRL_8 },
{ 0x0d, REG_MDP4_LVDS_PHY_PLL_CTRL_9 },
{ 0, 0 } }
},
};
static const struct pll_rate *find_rate(unsigned long rate)
{
int i;
for (i = 1; i < ARRAY_SIZE(freqtbl); i++)
if (rate > freqtbl[i].rate)
return &freqtbl[i-1];
return &freqtbl[i-1];
}
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static int mpd4_lvds_pll_enable(struct clk_hw *hw)
{
struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw);
struct mdp4_kms *mdp4_kms = get_kms(lvds_pll);
const struct pll_rate *pll_rate = find_rate(lvds_pll->pixclk);
int i;
DBG("pixclk=%lu (%lu)", lvds_pll->pixclk, pll_rate->rate);
if (WARN_ON(!pll_rate))
return -EINVAL;
mdp4_write(mdp4_kms, REG_MDP4_LCDC_LVDS_PHY_RESET, 0x33);
for (i = 0; pll_rate->conf[i].reg; i++)
mdp4_write(mdp4_kms, pll_rate->conf[i].reg, pll_rate->conf[i].val);
mdp4_write(mdp4_kms, REG_MDP4_LVDS_PHY_PLL_CTRL_0, 0x01);
/* Wait until LVDS PLL is locked and ready */
while (!mdp4_read(mdp4_kms, REG_MDP4_LVDS_PHY_PLL_LOCKED))
cpu_relax();
return 0;
}
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static void mpd4_lvds_pll_disable(struct clk_hw *hw)
{
struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw);
struct mdp4_kms *mdp4_kms = get_kms(lvds_pll);
DBG("");
mdp4_write(mdp4_kms, REG_MDP4_LVDS_PHY_CFG0, 0x0);
mdp4_write(mdp4_kms, REG_MDP4_LVDS_PHY_PLL_CTRL_0, 0x0);
}
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static unsigned long mpd4_lvds_pll_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw);
return lvds_pll->pixclk;
}
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static long mpd4_lvds_pll_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
const struct pll_rate *pll_rate = find_rate(rate);
return pll_rate->rate;
}
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static int mpd4_lvds_pll_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw);
lvds_pll->pixclk = rate;
return 0;
}
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static const struct clk_ops mpd4_lvds_pll_ops = {
.enable = mpd4_lvds_pll_enable,
.disable = mpd4_lvds_pll_disable,
.recalc_rate = mpd4_lvds_pll_recalc_rate,
.round_rate = mpd4_lvds_pll_round_rate,
.set_rate = mpd4_lvds_pll_set_rate,
};
static const char *mpd4_lvds_pll_parents[] = {
"pxo",
};
static struct clk_init_data pll_init = {
.name = "mpd4_lvds_pll",
.ops = &mpd4_lvds_pll_ops,
.parent_names = mpd4_lvds_pll_parents,
.num_parents = ARRAY_SIZE(mpd4_lvds_pll_parents),
};
struct clk *mpd4_lvds_pll_init(struct drm_device *dev)
{
struct mdp4_lvds_pll *lvds_pll;
struct clk *clk;
int ret;
lvds_pll = devm_kzalloc(dev->dev, sizeof(*lvds_pll), GFP_KERNEL);
if (!lvds_pll) {
ret = -ENOMEM;
goto fail;
}
lvds_pll->dev = dev;
lvds_pll->pll_hw.init = &pll_init;
clk = devm_clk_register(dev->dev, &lvds_pll->pll_hw);
if (IS_ERR(clk)) {
ret = PTR_ERR(clk);
goto fail;
}
return clk;
fail:
return ERR_PTR(ret);
}
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