blob: 5e81de58d932d4bb73c948c8d0fbe487a212ee9f [file] [log] [blame]
/*
* 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/delay.h>
#include <linux/err.h>
#include <linux/regulator/consumer.h>
#include <linux/export.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <video/omapdss.h>
#include "dss.h"
static struct {
struct platform_device *pdev;
bool update_enabled;
struct regulator *vdds_sdi_reg;
struct dss_lcd_mgr_config mgr_config;
struct omap_video_timings timings;
int datapairs;
struct omap_dss_device output;
} sdi;
struct sdi_clk_calc_ctx {
unsigned long pck_min, pck_max;
struct dss_clock_info dss_cinfo;
struct dispc_clock_info dispc_cinfo;
};
static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck,
unsigned long pck, void *data)
{
struct sdi_clk_calc_ctx *ctx = data;
ctx->dispc_cinfo.lck_div = lckd;
ctx->dispc_cinfo.pck_div = pckd;
ctx->dispc_cinfo.lck = lck;
ctx->dispc_cinfo.pck = pck;
return true;
}
static bool dpi_calc_dss_cb(int fckd, unsigned long fck, void *data)
{
struct sdi_clk_calc_ctx *ctx = data;
ctx->dss_cinfo.fck = fck;
ctx->dss_cinfo.fck_div = fckd;
return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
dpi_calc_dispc_cb, ctx);
}
static int sdi_calc_clock_div(unsigned long pclk,
struct dss_clock_info *dss_cinfo,
struct dispc_clock_info *dispc_cinfo)
{
int i;
struct sdi_clk_calc_ctx ctx;
/*
* DSS fclk gives us very few possibilities, so finding a good pixel
* clock may not be possible. We try multiple times to find the clock,
* each time widening the pixel clock range we look for, up to
* +/- 1MHz.
*/
for (i = 0; i < 10; ++i) {
bool ok;
memset(&ctx, 0, sizeof(ctx));
if (pclk > 1000 * i * i * i)
ctx.pck_min = max(pclk - 1000 * i * i * i, 0lu);
else
ctx.pck_min = 0;
ctx.pck_max = pclk + 1000 * i * i * i;
ok = dss_div_calc(ctx.pck_min, dpi_calc_dss_cb, &ctx);
if (ok) {
*dss_cinfo = ctx.dss_cinfo;
*dispc_cinfo = ctx.dispc_cinfo;
return 0;
}
}
return -EINVAL;
}
static void sdi_config_lcd_manager(struct omap_dss_device *dssdev)
{
struct omap_overlay_manager *mgr = sdi.output.manager;
sdi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
sdi.mgr_config.stallmode = false;
sdi.mgr_config.fifohandcheck = false;
sdi.mgr_config.video_port_width = 24;
sdi.mgr_config.lcden_sig_polarity = 1;
dss_mgr_set_lcd_config(mgr, &sdi.mgr_config);
}
int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
{
struct omap_dss_device *out = &sdi.output;
struct omap_video_timings *t = &sdi.timings;
struct dss_clock_info dss_cinfo;
struct dispc_clock_info dispc_cinfo;
unsigned long pck;
int r;
if (out == NULL || out->manager == NULL) {
DSSERR("failed to enable display: no output/manager\n");
return -ENODEV;
}
r = regulator_enable(sdi.vdds_sdi_reg);
if (r)
goto err_reg_enable;
r = dispc_runtime_get();
if (r)
goto err_get_dispc;
/* 15.5.9.1.2 */
t->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
t->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
r = sdi_calc_clock_div(t->pixel_clock * 1000, &dss_cinfo, &dispc_cinfo);
if (r)
goto err_calc_clock_div;
sdi.mgr_config.clock_info = dispc_cinfo;
pck = dss_cinfo.fck / dispc_cinfo.lck_div / dispc_cinfo.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;
}
dss_mgr_set_timings(out->manager, t);
r = dss_set_clock_div(&dss_cinfo);
if (r)
goto err_set_dss_clock_div;
sdi_config_lcd_manager(dssdev);
/*
* LCLK and PCLK divisors are located in shadow registers, and we
* normally write them to DISPC registers when enabling the output.
* However, SDI uses pck-free as source clock for its PLL, and pck-free
* is affected by the divisors. And as we need the PLL before enabling
* the output, we need to write the divisors early.
*
* It seems just writing to the DISPC register is enough, and we don't
* need to care about the shadow register mechanism for pck-free. The
* exact reason for this is unknown.
*/
dispc_mgr_set_clock_div(out->manager->id, &sdi.mgr_config.clock_info);
dss_sdi_init(sdi.datapairs);
r = dss_sdi_enable();
if (r)
goto err_sdi_enable;
mdelay(2);
r = dss_mgr_enable(out->manager);
if (r)
goto err_mgr_enable;
return 0;
err_mgr_enable:
dss_sdi_disable();
err_sdi_enable:
err_set_dss_clock_div:
err_calc_clock_div:
dispc_runtime_put();
err_get_dispc:
regulator_disable(sdi.vdds_sdi_reg);
err_reg_enable:
return r;
}
EXPORT_SYMBOL(omapdss_sdi_display_enable);
void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
{
struct omap_overlay_manager *mgr = sdi.output.manager;
dss_mgr_disable(mgr);
dss_sdi_disable();
dispc_runtime_put();
regulator_disable(sdi.vdds_sdi_reg);
}
EXPORT_SYMBOL(omapdss_sdi_display_disable);
void omapdss_sdi_set_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
sdi.timings = *timings;
}
EXPORT_SYMBOL(omapdss_sdi_set_timings);
void omapdss_sdi_set_datapairs(struct omap_dss_device *dssdev, int datapairs)
{
sdi.datapairs = datapairs;
}
EXPORT_SYMBOL(omapdss_sdi_set_datapairs);
static int sdi_init_regulator(void)
{
struct regulator *vdds_sdi;
if (sdi.vdds_sdi_reg)
return 0;
vdds_sdi = dss_get_vdds_sdi();
if (IS_ERR(vdds_sdi)) {
vdds_sdi = devm_regulator_get(&sdi.pdev->dev, "vdds_sdi");
if (IS_ERR(vdds_sdi)) {
DSSERR("can't get VDDS_SDI regulator\n");
return PTR_ERR(vdds_sdi);
}
}
sdi.vdds_sdi_reg = vdds_sdi;
return 0;
}
static struct omap_dss_device *sdi_find_dssdev(struct platform_device *pdev)
{
struct omap_dss_board_info *pdata = pdev->dev.platform_data;
const char *def_disp_name = omapdss_get_default_display_name();
struct omap_dss_device *def_dssdev;
int i;
def_dssdev = NULL;
for (i = 0; i < pdata->num_devices; ++i) {
struct omap_dss_device *dssdev = pdata->devices[i];
if (dssdev->type != OMAP_DISPLAY_TYPE_SDI)
continue;
if (def_dssdev == NULL)
def_dssdev = dssdev;
if (def_disp_name != NULL &&
strcmp(dssdev->name, def_disp_name) == 0) {
def_dssdev = dssdev;
break;
}
}
return def_dssdev;
}
static int sdi_probe_pdata(struct platform_device *sdidev)
{
struct omap_dss_device *plat_dssdev;
struct omap_dss_device *dssdev;
int r;
plat_dssdev = sdi_find_dssdev(sdidev);
if (!plat_dssdev)
return 0;
dssdev = dss_alloc_and_init_device(&sdidev->dev);
if (!dssdev)
return -ENOMEM;
dss_copy_device_pdata(dssdev, plat_dssdev);
r = sdi_init_regulator();
if (r) {
DSSERR("device %s init failed: %d\n", dssdev->name, r);
dss_put_device(dssdev);
return r;
}
r = omapdss_output_set_device(&sdi.output, dssdev);
if (r) {
DSSERR("failed to connect output to new device: %s\n",
dssdev->name);
dss_put_device(dssdev);
return r;
}
r = dss_add_device(dssdev);
if (r) {
DSSERR("device %s register failed: %d\n", dssdev->name, r);
omapdss_output_unset_device(&sdi.output);
dss_put_device(dssdev);
return r;
}
return 0;
}
static void sdi_init_output(struct platform_device *pdev)
{
struct omap_dss_device *out = &sdi.output;
out->dev = &pdev->dev;
out->id = OMAP_DSS_OUTPUT_SDI;
out->output_type = OMAP_DISPLAY_TYPE_SDI;
out->name = "sdi.0";
out->dispc_channel = OMAP_DSS_CHANNEL_LCD;
dss_register_output(out);
}
static void __exit sdi_uninit_output(struct platform_device *pdev)
{
struct omap_dss_device *out = &sdi.output;
dss_unregister_output(out);
}
static int omap_sdi_probe(struct platform_device *pdev)
{
int r;
sdi.pdev = pdev;
sdi_init_output(pdev);
if (pdev->dev.platform_data) {
r = sdi_probe_pdata(pdev);
if (r)
goto err_probe;
}
return 0;
err_probe:
sdi_uninit_output(pdev);
return r;
}
static int __exit omap_sdi_remove(struct platform_device *pdev)
{
dss_unregister_child_devices(&pdev->dev);
sdi_uninit_output(pdev);
return 0;
}
static struct platform_driver omap_sdi_driver = {
.probe = omap_sdi_probe,
.remove = __exit_p(omap_sdi_remove),
.driver = {
.name = "omapdss_sdi",
.owner = THIS_MODULE,
},
};
int __init sdi_init_platform_driver(void)
{
return platform_driver_register(&omap_sdi_driver);
}
void __exit sdi_uninit_platform_driver(void)
{
platform_driver_unregister(&omap_sdi_driver);
}