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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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