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    Subject[PATCH 13/19] OMAP: DSS2: SDI driver
    Date
    SDI (Serial Display Interface) implements TI Flatlink 3G display
    interface.

    Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
    ---
    drivers/video/omap2/dss/sdi.c | 261 +++++++++++++++++++++++++++++++++++++++++
    1 files changed, 261 insertions(+), 0 deletions(-)
    create mode 100644 drivers/video/omap2/dss/sdi.c

    diff --git a/drivers/video/omap2/dss/sdi.c b/drivers/video/omap2/dss/sdi.c
    new file mode 100644
    index 0000000..a9c727e
    --- /dev/null
    +++ b/drivers/video/omap2/dss/sdi.c
    @@ -0,0 +1,261 @@
    +/*
    + * 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 <mach/board.h>
    +#include <mach/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 dispc_clock_info 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 = dispc_calc_clock_div(1, t->pixel_clock * 1000,
    + &cinfo);
    + else
    + r = dispc_get_clock_div(&cinfo);
    +
    + if (r)
    + goto err2;
    +
    + fck = cinfo.fck;
    + lck_div = cinfo.lck_div;
    + pck_div = 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 = dispc_set_clock_div(&cinfo);
    + if (r)
    + goto err2;
    +
    + if (!sdi.skip_init) {
    + dss_sdi_init(dssdev->phy.sdi.datapairs);
    + dss_sdi_enable();
    + mdelay(2);
    + }
    +
    + dispc_enable_lcd_out(1);
    +
    + 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:
    + dispc_enable_lcd_out(0);
    +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)
    + sdi_display_resume(dssdev);
    +
    + if (dssdev->driver->disable)
    + dssdev->driver->disable(dssdev);
    +
    + dispc_enable_lcd_out(0);
    +
    + 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);
    +
    + dispc_enable_lcd_out(0);
    +
    + 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)
    +{
    + if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED)
    + return -EINVAL;
    +
    + dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
    +
    + dss_sdi_enable();
    + mdelay(2);
    +
    + dispc_enable_lcd_out(1);
    +
    + if (dssdev->driver->resume)
    + dssdev->driver->resume(dssdev);
    +
    + dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
    +
    + return 0;
    +}
    +
    +static int sdi_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);
    + sdi.update_enabled = 0;
    + } else {
    + dispc_enable_lcd_out(1);
    + sdi.update_enabled = 1;
    + }
    +
    + return 0;
    +}
    +
    +static enum omap_dss_update_mode sdi_display_get_update_mode(
    + struct omap_dss_device *dssdev)
    +{
    + return sdi.update_enabled ? OMAP_DSS_UPDATE_AUTO :
    + OMAP_DSS_UPDATE_DISABLED;
    +}
    +
    +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->set_update_mode = sdi_display_set_update_mode;
    + dssdev->get_update_mode = sdi_display_get_update_mode;
    + 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)
    +{
    +}
    --
    1.6.4


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