OMAP: DSS2: DPI driver

This implements MIPI DPI interface.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
This commit is contained in:
Tomi Valkeinen 2009-08-07 13:15:50 +03:00
parent 80c397120f
commit 553c48cf5b

View File

@ -0,0 +1,399 @@
/*
* 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/errno.h>
#include <plat/display.h>
#include <plat/cpu.h>
#include "dss.h"
static struct {
int update_enabled;
} dpi;
#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
static int dpi_set_dsi_clk(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_clk_source(0, 1);
r = dispc_set_clock_div(&dispc_cinfo);
if (r)
return r;
*fck = dsi_cinfo.dsi1_pll_fclk;
*lck_div = dispc_cinfo.lck_div;
*pck_div = dispc_cinfo.pck_div;
return 0;
}
#else
static int dpi_set_dispc_clk(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(&dispc_cinfo);
if (r)
return r;
*fck = dss_cinfo.fck;
*lck_div = dispc_cinfo.lck_div;
*pck_div = dispc_cinfo.pck_div;
return 0;
}
#endif
static int dpi_set_mode(struct omap_dss_device *dssdev)
{
struct omap_video_timings *t = &dssdev->panel.timings;
int lck_div, pck_div;
unsigned long fck;
unsigned long pck;
bool is_tft;
int r = 0;
dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
dispc_set_pol_freq(dssdev->panel.config, dssdev->panel.acbi,
dssdev->panel.acb);
is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
r = dpi_set_dsi_clk(is_tft, t->pixel_clock * 1000,
&fck, &lck_div, &pck_div);
#else
r = dpi_set_dispc_clk(is_tft, t->pixel_clock * 1000,
&fck, &lck_div, &pck_div);
#endif
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(t);
err0:
dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
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(OMAP_DSS_PARALLELMODE_BYPASS);
dispc_set_lcd_display_type(is_tft ? OMAP_DSS_LCD_DISPLAY_TFT :
OMAP_DSS_LCD_DISPLAY_STN);
dispc_set_tft_data_lines(dssdev->phy.dpi.data_lines);
return 0;
}
static int 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 (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
DSSERR("display already enabled\n");
r = -EINVAL;
goto err1;
}
dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
r = dpi_basic_init(dssdev);
if (r)
goto err2;
#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
dss_clk_enable(DSS_CLK_FCK2);
r = dsi_pll_init(dssdev, 0, 1);
if (r)
goto err3;
#endif
r = dpi_set_mode(dssdev);
if (r)
goto err4;
mdelay(2);
dispc_enable_lcd_out(1);
r = dssdev->driver->enable(dssdev);
if (r)
goto err5;
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
return 0;
err5:
dispc_enable_lcd_out(0);
err4:
#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
dsi_pll_uninit();
err3:
dss_clk_disable(DSS_CLK_FCK2);
#endif
err2:
dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
err1:
omap_dss_stop_device(dssdev);
err0:
return r;
}
static int dpi_display_resume(struct omap_dss_device *dssdev);
static void dpi_display_disable(struct omap_dss_device *dssdev)
{
if (dssdev->state == OMAP_DSS_DISPLAY_DISABLED)
return;
if (dssdev->state == OMAP_DSS_DISPLAY_SUSPENDED)
dpi_display_resume(dssdev);
dssdev->driver->disable(dssdev);
dispc_enable_lcd_out(0);
#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
dss_select_clk_source(0, 0);
dsi_pll_uninit();
dss_clk_disable(DSS_CLK_FCK2);
#endif
dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
omap_dss_stop_device(dssdev);
}
static int dpi_display_suspend(struct omap_dss_device *dssdev)
{
if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
return -EINVAL;
DSSDBG("dpi_display_suspend\n");
if (dssdev->driver->suspend)
dssdev->driver->suspend(dssdev);
dispc_enable_lcd_out(0);
dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
return 0;
}
static int dpi_display_resume(struct omap_dss_device *dssdev)
{
if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED)
return -EINVAL;
DSSDBG("dpi_display_resume\n");
dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
dispc_enable_lcd_out(1);
if (dssdev->driver->resume)
dssdev->driver->resume(dssdev);
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
return 0;
}
static 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(OMAP_DSS_CHANNEL_LCD);
}
}
static 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;
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;
struct dispc_clock_info dispc_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.dsi1_pll_fclk;
lck_div = dispc_cinfo.lck_div;
pck_div = dispc_cinfo.pck_div;
}
#else
{
struct dss_clock_info dss_cinfo;
struct dispc_clock_info dispc_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;
}
#endif
pck = fck / lck_div / pck_div / 1000;
timings->pixel_clock = pck;
return 0;
}
static void dpi_get_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
*timings = dssdev->panel.timings;
}
static int dpi_display_set_update_mode(struct omap_dss_device *dssdev,
enum omap_dss_update_mode mode)
{
if (mode == OMAP_DSS_UPDATE_MANUAL)
return -EINVAL;
if (mode == OMAP_DSS_UPDATE_DISABLED) {
dispc_enable_lcd_out(0);
dpi.update_enabled = 0;
} else {
dispc_enable_lcd_out(1);
dpi.update_enabled = 1;
}
return 0;
}
static enum omap_dss_update_mode dpi_display_get_update_mode(
struct omap_dss_device *dssdev)
{
return dpi.update_enabled ? OMAP_DSS_UPDATE_AUTO :
OMAP_DSS_UPDATE_DISABLED;
}
int dpi_init_display(struct omap_dss_device *dssdev)
{
DSSDBG("init_display\n");
dssdev->enable = dpi_display_enable;
dssdev->disable = dpi_display_disable;
dssdev->suspend = dpi_display_suspend;
dssdev->resume = dpi_display_resume;
dssdev->set_timings = dpi_set_timings;
dssdev->check_timings = dpi_check_timings;
dssdev->get_timings = dpi_get_timings;
dssdev->set_update_mode = dpi_display_set_update_mode;
dssdev->get_update_mode = dpi_display_get_update_mode;
return 0;
}
int dpi_init(void)
{
return 0;
}
void dpi_exit(void)
{
}