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/err.h>
 #include <linux/errno.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>

 #include <plat/display.h>
 #include <plat/cpu.h>

 #include "dss.h"

 static struct {
 	struct regulator *vdds_dsi_reg;
 } dpi;

 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
 static int dpi_set_dsi_clk(struct omap_dss_device *dssdev, 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_dispc_clk_source(DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC);

 	r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
 	if (r)
 		return r;

 	*fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 	*lck_div = dispc_cinfo.lck_div;
 	*pck_div = dispc_cinfo.pck_div;

 	return 0;
 }
 #else
 static int dpi_set_dispc_clk(struct omap_dss_device *dssdev, 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(dssdev->manager->id, &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_FCK);

 	dispc_set_pol_freq(dssdev->manager->id, 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(dssdev, is_tft, t->pixel_clock * 1000, &fck,
 			&lck_div, &pck_div);
 #else
 	r = dpi_set_dispc_clk(dssdev, 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(dssdev->manager->id, t);

 err0:
 	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
 	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(dssdev->manager->id,
 			OMAP_DSS_PARALLELMODE_BYPASS);
 	dispc_set_lcd_display_type(dssdev->manager->id, is_tft ?
 			OMAP_DSS_LCD_DISPLAY_TFT : OMAP_DSS_LCD_DISPLAY_STN);
 	dispc_set_tft_data_lines(dssdev->manager->id,
 			dssdev->phy.dpi.data_lines);

 	return 0;
 }

 int omapdss_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 (cpu_is_omap34xx()) {
 		r = regulator_enable(dpi.vdds_dsi_reg);
 		if (r)
 			goto err1;
 	}

 	dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);

 	r = dpi_basic_init(dssdev);
 	if (r)
 		goto err2;

 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
 	dss_clk_enable(DSS_CLK_SYSCK);
 	r = dsi_pll_init(dssdev, 0, 1);
 	if (r)
 		goto err3;
 #endif
 	r = dpi_set_mode(dssdev);
 	if (r)
 		goto err4;

 	mdelay(2);

 	dssdev->manager->enable(dssdev->manager);

 	return 0;

 err4:
 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
 	dsi_pll_uninit();
 err3:
 	dss_clk_disable(DSS_CLK_SYSCK);
 #endif
 err2:
 	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
 	if (cpu_is_omap34xx())
 		regulator_disable(dpi.vdds_dsi_reg);
 err1:
 	omap_dss_stop_device(dssdev);
 err0:
 	return r;
 }
 EXPORT_SYMBOL(omapdss_dpi_display_enable);

 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
 {
 	dssdev->manager->disable(dssdev->manager);

 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
 	dss_select_dispc_clk_source(DSS_CLK_SRC_FCK);
 	dsi_pll_uninit();
 	dss_clk_disable(DSS_CLK_SYSCK);
 #endif

 	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);

 	if (cpu_is_omap34xx())
 		regulator_disable(dpi.vdds_dsi_reg);

 	omap_dss_stop_device(dssdev);
 }
 EXPORT_SYMBOL(omapdss_dpi_display_disable);

 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(dssdev->manager->id);
 	}
 }
 EXPORT_SYMBOL(dpi_set_timings);

 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.dsi_pll_hsdiv_dispc_clk;
 		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;
 }
 EXPORT_SYMBOL(dpi_check_timings);

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

 	if (cpu_is_omap34xx() && 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;
 	}

 	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/err.h>
	#include <linux/errno.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/consumer.h>

	#include <plat/display.h>
	#include <plat/cpu.h>

	#include "dss.h"

	static struct {
	struct regulator *vdds_dsi_reg;
	} dpi;

	#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
	static int dpi_set_dsi_clk(struct omap_dss_device *dssdev, 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_dispc_clk_source(DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC);

	r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
	if (r)
	return r;

	*fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
	*lck_div = dispc_cinfo.lck_div;
	*pck_div = dispc_cinfo.pck_div;

	return 0;
	}
	#else
	static int dpi_set_dispc_clk(struct omap_dss_device *dssdev, 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(dssdev->manager->id, &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_FCK);

	dispc_set_pol_freq(dssdev->manager->id, 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(dssdev, is_tft, t->pixel_clock * 1000, &fck,
	&lck_div, &pck_div);
	#else
	r = dpi_set_dispc_clk(dssdev, 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(dssdev->manager->id, t);

	err0:
	dss_clk_disable(DSS_CLK_ICK \| DSS_CLK_FCK);
	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(dssdev->manager->id,
	OMAP_DSS_PARALLELMODE_BYPASS);
	dispc_set_lcd_display_type(dssdev->manager->id, is_tft ?
	OMAP_DSS_LCD_DISPLAY_TFT : OMAP_DSS_LCD_DISPLAY_STN);
	dispc_set_tft_data_lines(dssdev->manager->id,
	dssdev->phy.dpi.data_lines);

	return 0;
	}

	int omapdss_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 (cpu_is_omap34xx()) {
	r = regulator_enable(dpi.vdds_dsi_reg);
	if (r)
	goto err1;
	}

	dss_clk_enable(DSS_CLK_ICK \| DSS_CLK_FCK);

	r = dpi_basic_init(dssdev);
	if (r)
	goto err2;

	#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
	dss_clk_enable(DSS_CLK_SYSCK);
	r = dsi_pll_init(dssdev, 0, 1);
	if (r)
	goto err3;
	#endif
	r = dpi_set_mode(dssdev);
	if (r)
	goto err4;

	mdelay(2);

	dssdev->manager->enable(dssdev->manager);

	return 0;

	err4:
	#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
	dsi_pll_uninit();
	err3:
	dss_clk_disable(DSS_CLK_SYSCK);
	#endif
	err2:
	dss_clk_disable(DSS_CLK_ICK \| DSS_CLK_FCK);
	if (cpu_is_omap34xx())
	regulator_disable(dpi.vdds_dsi_reg);
	err1:
	omap_dss_stop_device(dssdev);
	err0:
	return r;
	}
	EXPORT_SYMBOL(omapdss_dpi_display_enable);

	void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
	{
	dssdev->manager->disable(dssdev->manager);

	#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
	dss_select_dispc_clk_source(DSS_CLK_SRC_FCK);
	dsi_pll_uninit();
	dss_clk_disable(DSS_CLK_SYSCK);
	#endif

	dss_clk_disable(DSS_CLK_ICK \| DSS_CLK_FCK);

	if (cpu_is_omap34xx())
	regulator_disable(dpi.vdds_dsi_reg);

	omap_dss_stop_device(dssdev);
	}
	EXPORT_SYMBOL(omapdss_dpi_display_disable);

	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(dssdev->manager->id);
	}
	}
	EXPORT_SYMBOL(dpi_set_timings);

	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.dsi_pll_hsdiv_dispc_clk;
	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;
	}
	EXPORT_SYMBOL(dpi_check_timings);

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

	if (cpu_is_omap34xx() && 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;
	}

	return 0;
	}

	int dpi_init(void)
	{
	return 0;
	}

	void dpi_exit(void)
	{
	}