drivers/video/omap2/dss/dpi.c - maze/linux - Git at Google

 /*
  * 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 <plat/display.h>
 #include <plat/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 dsi_cinfo;
 	struct dispc_clock_info dispc_cinfo;
 	int r;

 	r = dsi_pll_calc_clock_div_pck(is_tft, pck_req, &dsi_cinfo,
 			&dispc_cinfo);
 	if (r)
 		return r;

 	r = dsi_pll_set_clock_div(&dsi_cinfo);
 	if (r)
 		return r;

 	dss_select_clk_source(0, 1);

 	r = dispc_set_clock_div(&dispc_cinfo);
 	if (r)
 		return r;

 	*fck = dsi_cinfo.dsi1_pll_fclk;
 	*lck_div = dispc_cinfo.lck_div;
 	*pck_div = dispc_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 dss_clock_info dss_cinfo;
 	struct dispc_clock_info dispc_cinfo;
 	int r;

 	r = dss_calc_clock_div(is_tft, pck_req, &dss_cinfo, &dispc_cinfo);
 	if (r)
 		return r;

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

 	r = dispc_set_clock_div(&dispc_cinfo);
 	if (r)
 		return r;

 	*fck = dss_cinfo.fck;
 	*lck_div = dispc_cinfo.lck_div;
 	*pck_div = dispc_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(dssdev, 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 dsi_cinfo;
 		struct dispc_clock_info dispc_cinfo;
 		r = dsi_pll_calc_clock_div_pck(is_tft,
 				timings->pixel_clock * 1000,
 				&dsi_cinfo, &dispc_cinfo);

 		if (r)
 			return r;

 		fck = dsi_cinfo.dsi1_pll_fclk;
 		lck_div = dispc_cinfo.lck_div;
 		pck_div = dispc_cinfo.pck_div;
 	}
 #else
 	{
 		struct dss_clock_info dss_cinfo;
 		struct dispc_clock_info dispc_cinfo;
 		r = dss_calc_clock_div(is_tft, 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;
 	}
 #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)
 {
 }
	/*
	* 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 <plat/display.h>
	#include <plat/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 dsi_cinfo;
	struct dispc_clock_info dispc_cinfo;
	int r;

	r = dsi_pll_calc_clock_div_pck(is_tft, pck_req, &dsi_cinfo,
	&dispc_cinfo);
	if (r)
	return r;

	r = dsi_pll_set_clock_div(&dsi_cinfo);
	if (r)
	return r;

	dss_select_clk_source(0, 1);

	r = dispc_set_clock_div(&dispc_cinfo);
	if (r)
	return r;

	*fck = dsi_cinfo.dsi1_pll_fclk;
	*lck_div = dispc_cinfo.lck_div;
	*pck_div = dispc_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 dss_clock_info dss_cinfo;
	struct dispc_clock_info dispc_cinfo;
	int r;

	r = dss_calc_clock_div(is_tft, pck_req, &dss_cinfo, &dispc_cinfo);
	if (r)
	return r;

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

	r = dispc_set_clock_div(&dispc_cinfo);
	if (r)
	return r;

	*fck = dss_cinfo.fck;
	*lck_div = dispc_cinfo.lck_div;
	*pck_div = dispc_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(dssdev, 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 dsi_cinfo;
	struct dispc_clock_info dispc_cinfo;
	r = dsi_pll_calc_clock_div_pck(is_tft,
	timings->pixel_clock * 1000,
	&dsi_cinfo, &dispc_cinfo);

	if (r)
	return r;

	fck = dsi_cinfo.dsi1_pll_fclk;
	lck_div = dispc_cinfo.lck_div;
	pck_div = dispc_cinfo.pck_div;
	}
	#else
	{
	struct dss_clock_info dss_cinfo;
	struct dispc_clock_info dispc_cinfo;
	r = dss_calc_clock_div(is_tft, 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;
	}
	#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)
	{
	}