int dpi_check_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
struct dispc_clock_info dispc_cinfo;
bool is_tft;
if (!dispc_lcd_timings_ok(timings))
return -EINVAL;
if (timings->pixel_clock == 0)
return -EINVAL;
is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
{
struct dsi_clock_info dsi_cinfo;
int r = 0;
if (cpu_is_omap44xx()) {
dsi_cinfo.regn = 17;
dsi_cinfo.regm = 150;
dsi_cinfo.regm_dispc = 4;
dsi_cinfo.regm_dsi = 4;
dsi_cinfo.use_dss2_fck = true;
r = dsi_calc_clock_rates(&dsi_cinfo);
if (r)
return r;
dispc_find_clk_divs(is_tft, timings->pixel_clock * 1000,
dsi_cinfo.dsi_pll_dispc_fclk, &dispc_cinfo);
} else {
r = dsi_pll_calc_clock_div_pck(dssdev->channel ==
OMAP_DSS_CHANNEL_LCD ? DSI1 : DSI2,
is_tft, timings->pixel_clock * 1000,
&dsi_cinfo, &dispc_cinfo);
if (r)
return r;
}
}
#else /* #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL */
if (cpu_is_omap44xx())
dispc_find_clk_divs(is_tft, timings->pixel_clock * 1000,
dss_clk_get_rate(DSS_CLK_FCK1), &dispc_cinfo);
else {
struct dss_clock_info dss_cinfo;
int r = 0;
r = dss_calc_clock_div(is_tft, timings->pixel_clock * 1000,
&dss_cinfo, &dispc_cinfo);
if (r)
return r;
}
#endif /* CONFIG_OMAP2_DSS_USE_DSI_PLL */
timings->pixel_clock = dispc_cinfo.pck / 1000;
return 0;
}
static int dpi_set_dsi_clk(enum omap_channel channel, bool is_tft,
unsigned long pck_req, unsigned long *pck)
{
struct dsi_clock_info dsi_cinfo;
struct dispc_clock_info dispc_cinfo;
int r;
enum omap_dsi_index ix;
DSSDBG("DPI clk source is DSI PLL\n");
ix = (channel == OMAP_DSS_CHANNEL_LCD) ? DSI1 : DSI2;
if (!cpu_is_omap44xx()) {
r = dsi_pll_calc_clock_div_pck(ix, is_tft,
pck_req, &dsi_cinfo, &dispc_cinfo);
if (r)
return r;
} else {
dsi_cinfo.regn = 16;
dsi_cinfo.regm = 115;
dsi_cinfo.regm_dispc = 3;
dsi_cinfo.regm_dsi = 3;
dsi_cinfo.use_dss2_fck = true;
r = dsi_calc_clock_rates(channel, &dsi_cinfo);
DSSDBG("dpi_set_dsi_clk: dsi_calc_clock_rates=%d\n", r);
if (r)
return r;
dispc_find_clk_divs(is_tft, pck_req,
dsi_cinfo.dsi_pll_dispc_fclk, &dispc_cinfo);
}
r = dsi_pll_set_clock_div(ix, &dsi_cinfo);
DSSDBG("dpi_set_dsi_clk: dsi_pll_set_clock_div=%d\n", r);
if (r)
return r;
if (cpu_is_omap44xx()){
dss_select_dispc_clk_source(ix, (ix == DSI1) ?
DSS_SRC_PLL1_CLK1 : DSS_SRC_PLL2_CLK1);
dss_select_lcd_clk_source(ix, (ix == DSI1) ?
DSS_SRC_PLL1_CLK1 : DSS_SRC_PLL2_CLK1);
}else{
dss_select_dispc_clk_source(ix, DSS_SRC_DSI1_PLL_FCLK);
}
dispc_set_clock_div(channel, &dispc_cinfo);
*pck = dispc_cinfo.pck;
return 0;
}
/*
* linux/drivers/video/omap2/dss/dpi.c
*
* Copyright (C) 2009 Nokia Corporation
* Author: Tomi Valkeinen <*****@*****.**>
*
* Some code and ideas taken from drivers/video/omap/ driver
* by Imre Deak.
*
* 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/>.
*/
#define DSS_SUBSYS_NAME "DPI"
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <plat/display.h>
#include <plat/cpu.h>
#include <plat/omap-pm.h>
#include "dss.h"
static struct {
struct regulator *vdds_dsi_reg;
} dpi;
#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
static int dpi_set_dsi_clk(enum omap_channel channel, bool is_tft,
unsigned long pck_req, unsigned long *pck)
{
struct dsi_clock_info dsi_cinfo;
struct dispc_clock_info dispc_cinfo;
int r;
enum omap_dsi_index ix;
DSSDBG("DPI clk source is DSI PLL\n");
ix = (channel == OMAP_DSS_CHANNEL_LCD) ? DSI1 : DSI2;
if (!cpu_is_omap44xx()) {
r = dsi_pll_calc_clock_div_pck(ix, is_tft,
pck_req, &dsi_cinfo, &dispc_cinfo);
if (r)
return r;
} else {
dsi_cinfo.regn = 16;
dsi_cinfo.regm = 115;
dsi_cinfo.regm_dispc = 3;
dsi_cinfo.regm_dsi = 3;
dsi_cinfo.use_dss2_fck = true;
r = dsi_calc_clock_rates(channel, &dsi_cinfo);
DSSDBG("dpi_set_dsi_clk: dsi_calc_clock_rates=%d\n", r);
if (r)
return r;
dispc_find_clk_divs(is_tft, pck_req,
dsi_cinfo.dsi_pll_dispc_fclk, &dispc_cinfo);
}
r = dsi_pll_set_clock_div(ix, &dsi_cinfo);
DSSDBG("dpi_set_dsi_clk: dsi_pll_set_clock_div=%d\n", r);
if (r)
return r;
if (cpu_is_omap44xx()){
dss_select_dispc_clk_source(ix, (ix == DSI1) ?
DSS_SRC_PLL1_CLK1 : DSS_SRC_PLL2_CLK1);
dss_select_lcd_clk_source(ix, (ix == DSI1) ?
DSS_SRC_PLL1_CLK1 : DSS_SRC_PLL2_CLK1);
}else{
dss_select_dispc_clk_source(ix, DSS_SRC_DSI1_PLL_FCLK);
}
dispc_set_clock_div(channel, &dispc_cinfo);
*pck = dispc_cinfo.pck;
return 0;
}
#else /* #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL */
static int dpi_set_dispc_clk(enum omap_channel channel,
bool is_tft, unsigned long pck_req, unsigned long *pck)
{
struct dispc_clock_info dispc_cinfo;
enum omap_dsi_index ix;
DSSDBG("DPI clk source is DISPC\n");
ix = (channel == OMAP_DSS_CHANNEL_LCD) ? DSI1 : DSI2;
if (cpu_is_omap44xx())
dispc_find_clk_divs(is_tft, pck_req,
dss_clk_get_rate(DSS_CLK_FCK1), &dispc_cinfo);
else {
struct dss_clock_info dss_cinfo;
int r;
r = dss_calc_clock_div(is_tft, pck_req,
&dss_cinfo, &dispc_cinfo);
if (r)
return r;
r = dss_set_clock_div(&dss_cinfo);
if (r)
return r;
}
dss_select_dispc_clk_source(ix, DSS_SRC_DSS1_ALWON_FCLK);
if (cpu_is_omap44xx())
dss_select_lcd_clk_source(ix, DSS_SRC_DSS1_ALWON_FCLK);
dispc_set_clock_div(channel, &dispc_cinfo);
*pck = dispc_cinfo.pck;
return 0;
}
int dss_calc_clock_div(bool is_tft, unsigned long req_pck,
struct dss_clock_info *dss_cinfo,
struct dispc_clock_info *dispc_cinfo)
{
unsigned long prate;
struct dss_clock_info best_dss;
struct dispc_clock_info best_dispc;
unsigned long fck;
u16 fck_div;
int match = 0;
int min_fck_per_pck;
prate = dss_get_dpll4_rate();
fck = dss_clk_get_rate(DSS_CLK_FCK1);
if (req_pck == dss.cache_req_pck &&
((cpu_is_omap34xx() && prate == dss.cache_prate) ||
dss.cache_dss_cinfo.fck == fck)) {
DSSDBG("dispc clock info found from cache.\n");
*dss_cinfo = dss.cache_dss_cinfo;
*dispc_cinfo = dss.cache_dispc_cinfo;
return 0;
}
min_fck_per_pck = CONFIG_OMAP2_DSS_MIN_FCK_PER_PCK;
if (min_fck_per_pck &&
req_pck * min_fck_per_pck > DISPC_MAX_FCK) {
DSSERR("Requested pixel clock not possible with the current "
"OMAP2_DSS_MIN_FCK_PER_PCK setting. Turning "
"the constraint off.\n");
min_fck_per_pck = 0;
}
retry:
memset(&best_dss, 0, sizeof(best_dss));
memset(&best_dispc, 0, sizeof(best_dispc));
if (cpu_is_omap24xx()) {
struct dispc_clock_info cur_dispc;
/* XXX can we change the clock on omap2? */
fck = dss_clk_get_rate(DSS_CLK_FCK1);
fck_div = 1;
dispc_find_clk_divs(is_tft, req_pck, fck, &cur_dispc);
match = 1;
best_dss.fck = fck;
best_dss.fck_div = fck_div;
best_dispc = cur_dispc;
goto found;
} else if (cpu_is_omap34xx()) {
if (cpu_is_omap3630())
fck_div = 32;
else
fck_div = 16;
for ( ; fck_div > 0; --fck_div) {
struct dispc_clock_info cur_dispc;
if (cpu_is_omap3630())
fck = prate / fck_div ;
else
fck = prate / fck_div * 2;
if (fck > DISPC_MAX_FCK)
continue;
if (min_fck_per_pck &&
fck < req_pck * min_fck_per_pck)
continue;
match = 1;
dispc_find_clk_divs(is_tft, req_pck, fck, &cur_dispc);
if (abs(cur_dispc.pck - req_pck) <
abs(best_dispc.pck - req_pck)) {
best_dss.fck = fck;
best_dss.fck_div = fck_div;
best_dispc = cur_dispc;
if (cur_dispc.pck == req_pck)
goto found;
}
}
} else if (cpu_is_omap34xx()){
;/*do nothing for now*/
} else
BUG();
found:
if (!match) {
if (min_fck_per_pck) {
DSSERR("Could not find suitable clock settings.\n"
"Turning FCK/PCK constraint off and"
"trying again.\n");
min_fck_per_pck = 0;
goto retry;
}
DSSERR("Could not find suitable clock settings.\n");
return -EINVAL;
}
if (dss_cinfo)
*dss_cinfo = best_dss;
if (dispc_cinfo)
*dispc_cinfo = best_dispc;
dss.cache_req_pck = req_pck;
dss.cache_prate = prate;
dss.cache_dss_cinfo = best_dss;
dss.cache_dispc_cinfo = best_dispc;
return 0;
}
