dpi.c

Go to the documentation of this file.

/*
 * linux/drivers/video/omap2/dss/dpi.c
 *
 * Copyright (C) 2009 Nokia Corporation
 * Author: Tomi Valkeinen <[email protected]>
 *
 * 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/delay.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/string.h>

#include <video/omapdss.h>

#include "dss.h"
#include "dss_features.h"

static struct {
    struct regulator *vdds_dsi_reg;
    struct platform_device *dsidev;

    struct mutex lock;

    struct omap_video_timings timings;
    struct dss_lcd_mgr_config mgr_config;
    int data_lines;

    struct omap_dss_output output;
} dpi;

static struct platform_device *dpi_get_dsidev(enum omap_dss_clk_source clk)
{
    int dsi_module;

    dsi_module = clk == OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ? 0 : 1;

    return dsi_get_dsidev_from_id(dsi_module);
}

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.dispc_fclk_src ==
            OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC ||
            dssdev->clocks.dispc.channel.lcd_clk_src ==
            OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
            dssdev->clocks.dispc.channel.lcd_clk_src ==
            OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC)
        return true;
    else
        return false;
}

static int dpi_set_dsi_clk(struct omap_dss_device *dssdev,
        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(dpi.dsidev, pck_req, &dsi_cinfo,
            &dispc_cinfo);
    if (r)
        return r;

    r = dsi_pll_set_clock_div(dpi.dsidev, &dsi_cinfo);
    if (r)
        return r;

    dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src);

    dpi.mgr_config.clock_info = dispc_cinfo;

    *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,
        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(pck_req, &dss_cinfo, &dispc_cinfo);
    if (r)
        return r;

    r = dss_set_clock_div(&dss_cinfo);
    if (r)
        return r;

    dpi.mgr_config.clock_info = dispc_cinfo;

    *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 = &dpi.timings;
    struct omap_overlay_manager *mgr = dssdev->output->manager;
    int lck_div = 0, pck_div = 0;
    unsigned long fck = 0;
    unsigned long pck;
    int r = 0;

    if (dpi_use_dsi_pll(dssdev))
        r = dpi_set_dsi_clk(dssdev, t->pixel_clock * 1000, &fck,
                &lck_div, &pck_div);
    else
        r = dpi_set_dispc_clk(dssdev, t->pixel_clock * 1000, &fck,
                &lck_div, &pck_div);
    if (r)
        return r;

    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;
    }

    dss_mgr_set_timings(mgr, t);

    return 0;
}

static void dpi_config_lcd_manager(struct omap_dss_device *dssdev)
{
    struct omap_overlay_manager *mgr = dssdev->output->manager;

    dpi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;

    dpi.mgr_config.stallmode = false;
    dpi.mgr_config.fifohandcheck = false;

    dpi.mgr_config.video_port_width = dpi.data_lines;

    dpi.mgr_config.lcden_sig_polarity = 0;

    dss_mgr_set_lcd_config(mgr, &dpi.mgr_config);
}

int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
{
    struct omap_dss_output *out = dssdev->output;
    int r;

    mutex_lock(&dpi.lock);

    if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi.vdds_dsi_reg) {
        DSSERR("no VDSS_DSI regulator\n");
        r = -ENODEV;
        goto err_no_reg;
    }

    if (out == NULL || out->manager == NULL) {
        DSSERR("failed to enable display: no output/manager\n");
        r = -ENODEV;
        goto err_no_out_mgr;
    }

    r = omap_dss_start_device(dssdev);
    if (r) {
        DSSERR("failed to start device\n");
        goto err_start_dev;
    }

    if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
        r = regulator_enable(dpi.vdds_dsi_reg);
        if (r)
            goto err_reg_enable;
    }

    r = dispc_runtime_get();
    if (r)
        goto err_get_dispc;

    r = dss_dpi_select_source(dssdev->channel);
    if (r)
        goto err_src_sel;

    if (dpi_use_dsi_pll(dssdev)) {
        r = dsi_runtime_get(dpi.dsidev);
        if (r)
            goto err_get_dsi;

        r = dsi_pll_init(dpi.dsidev, 0, 1);
        if (r)
            goto err_dsi_pll_init;
    }

    r = dpi_set_mode(dssdev);
    if (r)
        goto err_set_mode;

    dpi_config_lcd_manager(dssdev);

    mdelay(2);

    r = dss_mgr_enable(out->manager);
    if (r)
        goto err_mgr_enable;

    mutex_unlock(&dpi.lock);

    return 0;

err_mgr_enable:
err_set_mode:
    if (dpi_use_dsi_pll(dssdev))
        dsi_pll_uninit(dpi.dsidev, true);
err_dsi_pll_init:
    if (dpi_use_dsi_pll(dssdev))
        dsi_runtime_put(dpi.dsidev);
err_get_dsi:
err_src_sel:
    dispc_runtime_put();
err_get_dispc:
    if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
        regulator_disable(dpi.vdds_dsi_reg);
err_reg_enable:
    omap_dss_stop_device(dssdev);
err_start_dev:
err_no_out_mgr:
err_no_reg:
    mutex_unlock(&dpi.lock);
    return r;
}
EXPORT_SYMBOL(omapdss_dpi_display_enable);

void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
{
    struct omap_overlay_manager *mgr = dssdev->output->manager;

    mutex_lock(&dpi.lock);

    dss_mgr_disable(mgr);

    if (dpi_use_dsi_pll(dssdev)) {
        dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
        dsi_pll_uninit(dpi.dsidev, true);
        dsi_runtime_put(dpi.dsidev);
    }

    dispc_runtime_put();

    if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
        regulator_disable(dpi.vdds_dsi_reg);

    omap_dss_stop_device(dssdev);

    mutex_unlock(&dpi.lock);
}
EXPORT_SYMBOL(omapdss_dpi_display_disable);

void omapdss_dpi_set_timings(struct omap_dss_device *dssdev,
        struct omap_video_timings *timings)
{
    DSSDBG("dpi_set_timings\n");

    mutex_lock(&dpi.lock);

    dpi.timings = *timings;

    mutex_unlock(&dpi.lock);
}
EXPORT_SYMBOL(omapdss_dpi_set_timings);

int dpi_check_timings(struct omap_dss_device *dssdev,
            struct omap_video_timings *timings)
{
    int r;
    struct omap_overlay_manager *mgr = dssdev->output->manager;
    int lck_div, pck_div;
    unsigned long fck;
    unsigned long pck;
    struct dispc_clock_info dispc_cinfo;

    if (dss_mgr_check_timings(mgr, timings))
        return -EINVAL;

    if (timings->pixel_clock == 0)
        return -EINVAL;

    if (dpi_use_dsi_pll(dssdev)) {
        struct dsi_clock_info dsi_cinfo;
        r = dsi_pll_calc_clock_div_pck(dpi.dsidev,
                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(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);

void omapdss_dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
{
    mutex_lock(&dpi.lock);

    dpi.data_lines = data_lines;

    mutex_unlock(&dpi.lock);
}
EXPORT_SYMBOL(omapdss_dpi_set_data_lines);

static int __init dpi_init_display(struct omap_dss_device *dssdev)
{
    DSSDBG("init_display\n");

    if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) &&
                    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;
    }

    if (dpi_use_dsi_pll(dssdev)) {
        enum omap_dss_clk_source dispc_fclk_src =
            dssdev->clocks.dispc.dispc_fclk_src;
        dpi.dsidev = dpi_get_dsidev(dispc_fclk_src);
    }

    return 0;
}

static struct omap_dss_device * __init dpi_find_dssdev(struct platform_device *pdev)
{
    struct omap_dss_board_info *pdata = pdev->dev.platform_data;
    const char *def_disp_name = dss_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_DPI)
            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 void __init dpi_probe_pdata(struct platform_device *dpidev)
{
    struct omap_dss_device *plat_dssdev;
    struct omap_dss_device *dssdev;
    int r;

    plat_dssdev = dpi_find_dssdev(dpidev);

    if (!plat_dssdev)
        return;

    dssdev = dss_alloc_and_init_device(&dpidev->dev);
    if (!dssdev)
        return;

    dss_copy_device_pdata(dssdev, plat_dssdev);

    r = dpi_init_display(dssdev);
    if (r) {
        DSSERR("device %s init failed: %d\n", dssdev->name, r);
        dss_put_device(dssdev);
        return;
    }

    r = dss_add_device(dssdev);
    if (r) {
        DSSERR("device %s register failed: %d\n", dssdev->name, r);
        dss_put_device(dssdev);
        return;
    }
}

static void __init dpi_init_output(struct platform_device *pdev)
{
    struct omap_dss_output *out = &dpi.output;

    out->pdev = pdev;
    out->id = OMAP_DSS_OUTPUT_DPI;
    out->type = OMAP_DISPLAY_TYPE_DPI;

    dss_register_output(out);
}

static void __exit dpi_uninit_output(struct platform_device *pdev)
{
    struct omap_dss_output *out = &dpi.output;

    dss_unregister_output(out);
}

static int __init omap_dpi_probe(struct platform_device *pdev)
{
    mutex_init(&dpi.lock);

    dpi_init_output(pdev);

    dpi_probe_pdata(pdev);

    return 0;
}

static int __exit omap_dpi_remove(struct platform_device *pdev)
{
    dss_unregister_child_devices(&pdev->dev);

    dpi_uninit_output(pdev);

    return 0;
}

static struct platform_driver omap_dpi_driver = {
    .remove         = __exit_p(omap_dpi_remove),
    .driver         = {
        .name   = "omapdss_dpi",
        .owner  = THIS_MODULE,
    },
};

int __init dpi_init_platform_driver(void)
{
    return platform_driver_probe(&omap_dpi_driver, omap_dpi_probe);
}

void __exit dpi_uninit_platform_driver(void)
{
    platform_driver_unregister(&omap_dpi_driver);
}