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/*
* linux/drivers/video/omap2/dss/sdi.c
*
* Copyright (C) 2009 Nokia Corporation
* Author: Tomi Valkeinen <tomi.valkeinen@nokia.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/>.
*/
#define DSS_SUBSYS_NAME "SDI"
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <plat/display.h>
#include "dss.h"
static struct {
bool skip_init;
bool update_enabled;
} sdi;
static void sdi_basic_init(void)
{
dispc_set_parallel_interface_mode(OMAP_DSS_PARALLELMODE_BYPASS);
dispc_set_lcd_display_type(OMAP_DSS_LCD_DISPLAY_TFT);
dispc_set_tft_data_lines(24);
dispc_lcd_enable_signal_polarity(1);
}
static int sdi_display_enable(struct omap_dss_device *dssdev)
{
struct omap_video_timings *t = &dssdev->panel.timings;
struct dss_clock_info dss_cinfo;
struct dispc_clock_info dispc_cinfo;
u16 lck_div, pck_div;
unsigned long fck;
unsigned long pck;
int r;
r = omap_dss_start_device(dssdev);
if (r) {
DSSERR("failed to start device\n");
goto err0;
}
if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
DSSERR("dssdev already enabled\n");
r = -EINVAL;
goto err1;
}
/* In case of skip_init sdi_init has already enabled the clocks */
if (!sdi.skip_init)
dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
sdi_basic_init();
/* 15.5.9.1.2 */
dssdev->panel.config |= OMAP_DSS_LCD_RF | OMAP_DSS_LCD_ONOFF;
dispc_set_pol_freq(dssdev->panel.config, dssdev->panel.acbi,
dssdev->panel.acb);
if (!sdi.skip_init) {
r = dss_calc_clock_div(1, t->pixel_clock * 1000,
&dss_cinfo, &dispc_cinfo);
} else {
r = dss_get_clock_div(&dss_cinfo);
r = dispc_get_clock_div(&dispc_cinfo);
}
if (r)
goto err2;
fck = dss_cinfo.fck;
lck_div = dispc_cinfo.lck_div;
pck_div = dispc_cinfo.pck_div;
pck = fck / lck_div / pck_div / 1000;
if (pck != t->pixel_clock) {
DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
"got %lu kHz\n",
t->pixel_clock, pck);
t->pixel_clock = pck;
}
dispc_set_lcd_timings(t);
r = dss_set_clock_div(&dss_cinfo);
if (r)
goto err2;
r = dispc_set_clock_div(&dispc_cinfo);
if (r)
goto err2;
if (!sdi.skip_init) {
dss_sdi_init(dssdev->phy.sdi.datapairs);
r = dss_sdi_enable();
if (r)
goto err1;
mdelay(2);
}
dssdev->manager->enable(dssdev->manager);
if (dssdev->driver->enable) {
r = dssdev->driver->enable(dssdev);
if (r)
goto err3;
}
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
sdi.skip_init = 0;
return 0;
err3:
dssdev->manager->disable(dssdev->manager);
err2:
dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
err1:
omap_dss_stop_device(dssdev);
err0:
return r;
}
static int sdi_display_resume(struct omap_dss_device *dssdev);
static void sdi_display_disable(struct omap_dss_device *dssdev)
{
if (dssdev->state == OMAP_DSS_DISPLAY_DISABLED)
return;
if (dssdev->state == OMAP_DSS_DISPLAY_SUSPENDED)
if (sdi_display_resume(dssdev))
return;
if (dssdev->driver->disable)
dssdev->driver->disable(dssdev);
dssdev->manager->disable(dssdev->manager);
dss_sdi_disable();
dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
omap_dss_stop_device(dssdev);
}
static int sdi_display_suspend(struct omap_dss_device *dssdev)
{
if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
return -EINVAL;
if (dssdev->driver->suspend)
dssdev->driver->suspend(dssdev);
dssdev->manager->disable(dssdev->manager);
dss_sdi_disable();
dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
return 0;
}
static int sdi_display_resume(struct omap_dss_device *dssdev)
{
int r;
if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED)
return -EINVAL;
dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
r = dss_sdi_enable();
if (r)
goto err;
mdelay(2);
dssdev->manager->enable(dssdev->manager);
if (dssdev->driver->resume)
dssdev->driver->resume(dssdev);
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
return 0;
err:
dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
return r;
}
static void sdi_get_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
*timings = dssdev->panel.timings;
}
int sdi_init_display(struct omap_dss_device *dssdev)
{
DSSDBG("SDI init\n");
dssdev->enable = sdi_display_enable;
dssdev->disable = sdi_display_disable;
dssdev->suspend = sdi_display_suspend;
dssdev->resume = sdi_display_resume;
dssdev->get_timings = sdi_get_timings;
return 0;
}
int sdi_init(bool skip_init)
{
/* we store this for first display enable, then clear it */
sdi.skip_init = skip_init;
/*
* Enable clocks already here, otherwise there would be a toggle
* of them until sdi_display_enable is called.
*/
if (skip_init)
dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
return 0;
}
void sdi_exit(void)
{
}
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