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Subject[PATCH 10/19] OMAP: DSS2: DPI driver
Date
This implements MIPI DPI interface.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
---
drivers/video/omap2/dss/dpi.c | 388 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 388 insertions(+), 0 deletions(-)
create mode 100644 drivers/video/omap2/dss/dpi.c

diff --git a/drivers/video/omap2/dss/dpi.c b/drivers/video/omap2/dss/dpi.c
new file mode 100644
index 0000000..b6543c8
--- /dev/null
+++ b/drivers/video/omap2/dss/dpi.c
@@ -0,0 +1,388 @@
+/*
+ * 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 <mach/board.h>
+#include <mach/display.h>
+#include <mach/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 cinfo;
+ int r;
+
+ r = dsi_pll_calc_pck(is_tft, pck_req, &cinfo);
+ if (r)
+ return r;
+
+ r = dsi_pll_program(&cinfo);
+ if (r)
+ return r;
+
+ dss_select_clk_source(0, 1);
+
+ dispc_set_lcd_divisor(cinfo.lck_div, cinfo.pck_div);
+
+ *fck = cinfo.dsi1_pll_fclk;
+ *lck_div = cinfo.lck_div;
+ *pck_div = 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 dispc_clock_info cinfo;
+ int r;
+
+ r = dispc_calc_clock_div(is_tft, pck_req, &cinfo);
+ if (r)
+ return r;
+
+ r = dispc_set_clock_div(&cinfo);
+ if (r)
+ return r;
+
+ *fck = cinfo.fck;
+ *lck_div = cinfo.lck_div;
+ *pck_div = 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(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 cinfo;
+ r = dsi_pll_calc_pck(is_tft, timings->pixel_clock * 1000,
+ &cinfo);
+
+ if (r)
+ return r;
+
+ fck = cinfo.dsi1_pll_fclk;
+ lck_div = cinfo.lck_div;
+ pck_div = cinfo.pck_div;
+ }
+#else
+ {
+ struct dispc_clock_info cinfo;
+ r = dispc_calc_clock_div(is_tft, timings->pixel_clock * 1000,
+ &cinfo);
+
+ if (r)
+ return r;
+
+ fck = cinfo.fck;
+ lck_div = cinfo.lck_div;
+ pck_div = 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)
+{
+}
+
--
1.6.4


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