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linux-hardened/drivers/video/omap2/dss/dpi.c
Tomi Valkeinen 2a89dc1533 OMAP: DSS2: DSI: add option to leave DSI lanes powered on 
The DSI pins are powered by VDDS_DSI. If VDDS_DSI is off, the DSI pins
are floating even if they are pinmuxed to, say, safe mode and there's a
pull down/up.

This patch gives the panel drivers an option to leave the VDDS_DSI power
enabled while the DSS itself is turned off. This can be used to keep the
DSI lanes in a valid state while DSS is off, if the DSI pins are muxed
for pull down (not done in this patch).

There will be a slight power consumption increase (~100 uA?) when the
VDDS_DSI is left on, but because this option is used when the panel is
left on, the regulator consumption is negligible compared to panel power
consumption.

When the panel is fully turned off the VDDS_DSI is also turned off.

As an added bonus this will give us faster start up time when starting
up the DSS and the regulator is already enabled.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
2011-05-11 14:20:13 +03:00

333 lines
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/*
* linux/drivers/video/omap2/dss/dpi.c
*
* Copyright (C) 2009 Nokia Corporation
* Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
*
* 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 <video/omapdss.h>
#include <plat/cpu.h>
#include "dss.h"
static struct {
struct regulator *vdds_dsi_reg;
} dpi;
static bool dpi_use_dsi_pll(struct omap_dss_device *dssdev)
{
if (dssdev->clocks.dispc.dispc_fclk_src ==
OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
dssdev->clocks.dispc.channel.lcd_clk_src ==
OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC)
return true;
else
return false;
}
static int dpi_set_dsi_clk(struct omap_dss_device *dssdev, bool is_tft,
unsigned long pck_req, unsigned long *fck, int *lck_div,
int *pck_div)
{
struct dsi_clock_info dsi_cinfo;
struct dispc_clock_info dispc_cinfo;
int r;
r = dsi_pll_calc_clock_div_pck(is_tft, pck_req, &dsi_cinfo,
&dispc_cinfo);
if (r)
return r;
r = dsi_pll_set_clock_div(&dsi_cinfo);
if (r)
return r;
dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src);
r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
if (r)
return r;
*fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
*lck_div = dispc_cinfo.lck_div;
*pck_div = dispc_cinfo.pck_div;
return 0;
}
static int dpi_set_dispc_clk(struct omap_dss_device *dssdev, bool is_tft,
unsigned long pck_req, unsigned long *fck, int *lck_div,
int *pck_div)
{
struct dss_clock_info dss_cinfo;
struct dispc_clock_info dispc_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;
r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
if (r)
return r;
*fck = dss_cinfo.fck;
*lck_div = dispc_cinfo.lck_div;
*pck_div = dispc_cinfo.pck_div;
return 0;
}
static int dpi_set_mode(struct omap_dss_device *dssdev)
{
struct omap_video_timings *t = &dssdev->panel.timings;
int lck_div = 0, pck_div = 0;
unsigned long fck = 0;
unsigned long pck;
bool is_tft;
int r = 0;
dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);
dispc_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
dssdev->panel.acbi, dssdev->panel.acb);
is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
if (dpi_use_dsi_pll(dssdev))
r = dpi_set_dsi_clk(dssdev, is_tft, t->pixel_clock * 1000,
&fck, &lck_div, &pck_div);
else
r = dpi_set_dispc_clk(dssdev, is_tft, t->pixel_clock * 1000,
&fck, &lck_div, &pck_div);
if (r)
goto err0;
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(dssdev->manager->id, t);
err0:
dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
return r;
}
static int dpi_basic_init(struct omap_dss_device *dssdev)
{
bool is_tft;
is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
dispc_set_parallel_interface_mode(dssdev->manager->id,
OMAP_DSS_PARALLELMODE_BYPASS);
dispc_set_lcd_display_type(dssdev->manager->id, is_tft ?
OMAP_DSS_LCD_DISPLAY_TFT : OMAP_DSS_LCD_DISPLAY_STN);
dispc_set_tft_data_lines(dssdev->manager->id,
dssdev->phy.dpi.data_lines);
return 0;
}
int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
{
int r;
r = omap_dss_start_device(dssdev);
if (r) {
DSSERR("failed to start device\n");
goto err0;
}
if (cpu_is_omap34xx()) {
r = regulator_enable(dpi.vdds_dsi_reg);
if (r)
goto err1;
}
dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);
r = dpi_basic_init(dssdev);
if (r)
goto err2;
if (dpi_use_dsi_pll(dssdev)) {
dss_clk_enable(DSS_CLK_SYSCK);
r = dsi_pll_init(dssdev, 0, 1);
if (r)
goto err3;
}
r = dpi_set_mode(dssdev);
if (r)
goto err4;
mdelay(2);
dssdev->manager->enable(dssdev->manager);
return 0;
err4:
if (dpi_use_dsi_pll(dssdev))
dsi_pll_uninit(true);
err3:
if (dpi_use_dsi_pll(dssdev))
dss_clk_disable(DSS_CLK_SYSCK);
err2:
dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
if (cpu_is_omap34xx())
regulator_disable(dpi.vdds_dsi_reg);
err1:
omap_dss_stop_device(dssdev);
err0:
return r;
}
EXPORT_SYMBOL(omapdss_dpi_display_enable);
void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
{
dssdev->manager->disable(dssdev->manager);
if (dpi_use_dsi_pll(dssdev)) {
dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
dsi_pll_uninit(true);
dss_clk_disable(DSS_CLK_SYSCK);
}
dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
if (cpu_is_omap34xx())
regulator_disable(dpi.vdds_dsi_reg);
omap_dss_stop_device(dssdev);
}
EXPORT_SYMBOL(omapdss_dpi_display_disable);
void dpi_set_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
DSSDBG("dpi_set_timings\n");
dssdev->panel.timings = *timings;
if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
dpi_set_mode(dssdev);
dispc_go(dssdev->manager->id);
}
}
EXPORT_SYMBOL(dpi_set_timings);
int dpi_check_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
bool is_tft;
int r;
int lck_div, pck_div;
unsigned long fck;
unsigned long pck;
struct dispc_clock_info dispc_cinfo;
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;
if (dpi_use_dsi_pll(dssdev)) {
struct dsi_clock_info dsi_cinfo;
r = dsi_pll_calc_clock_div_pck(is_tft,
timings->pixel_clock * 1000,
&dsi_cinfo, &dispc_cinfo);
if (r)
return r;
fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
} else {
struct dss_clock_info dss_cinfo;
r = dss_calc_clock_div(is_tft, timings->pixel_clock * 1000,
&dss_cinfo, &dispc_cinfo);
if (r)
return r;
fck = dss_cinfo.fck;
}
lck_div = dispc_cinfo.lck_div;
pck_div = dispc_cinfo.pck_div;
pck = fck / lck_div / pck_div / 1000;
timings->pixel_clock = pck;
return 0;
}
EXPORT_SYMBOL(dpi_check_timings);
int dpi_init_display(struct omap_dss_device *dssdev)
{
DSSDBG("init_display\n");
if (cpu_is_omap34xx() && dpi.vdds_dsi_reg == NULL) {
struct regulator *vdds_dsi;
vdds_dsi = dss_get_vdds_dsi();
if (IS_ERR(vdds_dsi)) {
DSSERR("can't get VDDS_DSI regulator\n");
return PTR_ERR(vdds_dsi);
}
dpi.vdds_dsi_reg = vdds_dsi;
}
return 0;
}
int dpi_init(void)
{
return 0;
}
void dpi_exit(void)
{
}
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