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

 /*
  * 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/delay.h>
 #include <linux/err.h>
 #include <linux/regulator/consumer.h>
 #include <linux/export.h>
 #include <linux/platform_device.h>
 #include <linux/string.h>

 #include <video/omapdss.h>
 #include "dss.h"

 static struct {
 	bool update_enabled;
 	struct regulator *vdds_sdi_reg;

 	struct dss_lcd_mgr_config mgr_config;
 	struct omap_video_timings timings;
 	int datapairs;

 	struct omap_dss_output output;
 } sdi;

 struct sdi_clk_calc_ctx {
 	unsigned long pck_min, pck_max;

 	struct dss_clock_info dss_cinfo;
 	struct dispc_clock_info dispc_cinfo;
 };

 static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck,
 		unsigned long pck, void *data)
 {
 	struct sdi_clk_calc_ctx *ctx = data;

 	ctx->dispc_cinfo.lck_div = lckd;
 	ctx->dispc_cinfo.pck_div = pckd;
 	ctx->dispc_cinfo.lck = lck;
 	ctx->dispc_cinfo.pck = pck;

 	return true;
 }

 static bool dpi_calc_dss_cb(int fckd, unsigned long fck, void *data)
 {
 	struct sdi_clk_calc_ctx *ctx = data;

 	ctx->dss_cinfo.fck = fck;
 	ctx->dss_cinfo.fck_div = fckd;

 	return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
 			dpi_calc_dispc_cb, ctx);
 }

 static int sdi_calc_clock_div(unsigned long pclk,
 		struct dss_clock_info *dss_cinfo,
 		struct dispc_clock_info *dispc_cinfo)
 {
 	int i;
 	struct sdi_clk_calc_ctx ctx;

 	/*
 	 * DSS fclk gives us very few possibilities, so finding a good pixel
 	 * clock may not be possible. We try multiple times to find the clock,
 	 * each time widening the pixel clock range we look for, up to
 	 * +/- 1MHz.
 	 */

 	for (i = 0; i < 10; ++i) {
 		bool ok;

 		memset(&ctx, 0, sizeof(ctx));
 		if (pclk > 1000 * i * i * i)
 			ctx.pck_min = max(pclk - 1000 * i * i * i, 0lu);
 		else
 			ctx.pck_min = 0;
 		ctx.pck_max = pclk + 1000 * i * i * i;

 		ok = dss_div_calc(ctx.pck_min, dpi_calc_dss_cb, &ctx);
 		if (ok) {
 			*dss_cinfo = ctx.dss_cinfo;
 			*dispc_cinfo = ctx.dispc_cinfo;
 			return 0;
 		}
 	}

 	return -EINVAL;
 }

 static void sdi_config_lcd_manager(struct omap_dss_device *dssdev)
 {
 	struct omap_overlay_manager *mgr = dssdev->output->manager;

 	sdi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;

 	sdi.mgr_config.stallmode = false;
 	sdi.mgr_config.fifohandcheck = false;

 	sdi.mgr_config.video_port_width = 24;
 	sdi.mgr_config.lcden_sig_polarity = 1;

 	dss_mgr_set_lcd_config(mgr, &sdi.mgr_config);
 }

 int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
 {
 	struct omap_dss_output *out = dssdev->output;
 	struct omap_video_timings *t = &sdi.timings;
 	struct dss_clock_info dss_cinfo;
 	struct dispc_clock_info dispc_cinfo;
 	unsigned long pck;
 	int r;

 	if (out == NULL || out->manager == NULL) {
 		DSSERR("failed to enable display: no output/manager\n");
 		return -ENODEV;
 	}

 	r = omap_dss_start_device(dssdev);
 	if (r) {
 		DSSERR("failed to start device\n");
 		goto err_start_dev;
 	}

 	r = regulator_enable(sdi.vdds_sdi_reg);
 	if (r)
 		goto err_reg_enable;

 	r = dispc_runtime_get();
 	if (r)
 		goto err_get_dispc;

 	/* 15.5.9.1.2 */
 	t->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
 	t->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;

 	r = sdi_calc_clock_div(t->pixel_clock * 1000, &dss_cinfo, &dispc_cinfo);
 	if (r)
 		goto err_calc_clock_div;

 	sdi.mgr_config.clock_info = dispc_cinfo;

 	pck = dss_cinfo.fck / dispc_cinfo.lck_div / dispc_cinfo.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;
 	}


 	dss_mgr_set_timings(out->manager, t);

 	r = dss_set_clock_div(&dss_cinfo);
 	if (r)
 		goto err_set_dss_clock_div;

 	sdi_config_lcd_manager(dssdev);

 	/*
 	 * LCLK and PCLK divisors are located in shadow registers, and we
 	 * normally write them to DISPC registers when enabling the output.
 	 * However, SDI uses pck-free as source clock for its PLL, and pck-free
 	 * is affected by the divisors. And as we need the PLL before enabling
 	 * the output, we need to write the divisors early.
 	 *
 	 * It seems just writing to the DISPC register is enough, and we don't
 	 * need to care about the shadow register mechanism for pck-free. The
 	 * exact reason for this is unknown.
 	 */
 	dispc_mgr_set_clock_div(out->manager->id, &sdi.mgr_config.clock_info);

 	dss_sdi_init(sdi.datapairs);
 	r = dss_sdi_enable();
 	if (r)
 		goto err_sdi_enable;
 	mdelay(2);

 	r = dss_mgr_enable(out->manager);
 	if (r)
 		goto err_mgr_enable;

 	return 0;

 err_mgr_enable:
 	dss_sdi_disable();
 err_sdi_enable:
 err_set_dss_clock_div:
 err_calc_clock_div:
 	dispc_runtime_put();
 err_get_dispc:
 	regulator_disable(sdi.vdds_sdi_reg);
 err_reg_enable:
 	omap_dss_stop_device(dssdev);
 err_start_dev:
 	return r;
 }
 EXPORT_SYMBOL(omapdss_sdi_display_enable);

 void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
 {
 	struct omap_overlay_manager *mgr = dssdev->output->manager;

 	dss_mgr_disable(mgr);

 	dss_sdi_disable();

 	dispc_runtime_put();

 	regulator_disable(sdi.vdds_sdi_reg);

 	omap_dss_stop_device(dssdev);
 }
 EXPORT_SYMBOL(omapdss_sdi_display_disable);

 void omapdss_sdi_set_timings(struct omap_dss_device *dssdev,
 		struct omap_video_timings *timings)
 {
 	sdi.timings = *timings;
 }
 EXPORT_SYMBOL(omapdss_sdi_set_timings);

 void omapdss_sdi_set_datapairs(struct omap_dss_device *dssdev, int datapairs)
 {
 	sdi.datapairs = datapairs;
 }
 EXPORT_SYMBOL(omapdss_sdi_set_datapairs);

 static int sdi_init_display(struct omap_dss_device *dssdev)
 {
 	DSSDBG("SDI init\n");

 	if (sdi.vdds_sdi_reg == NULL) {
 		struct regulator *vdds_sdi;

 		vdds_sdi = dss_get_vdds_sdi();

 		if (IS_ERR(vdds_sdi)) {
 			DSSERR("can't get VDDS_SDI regulator\n");
 			return PTR_ERR(vdds_sdi);
 		}

 		sdi.vdds_sdi_reg = vdds_sdi;
 	}

 	return 0;
 }

 static struct omap_dss_device *sdi_find_dssdev(struct platform_device *pdev)
 {
 	struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 	const char *def_disp_name = omapdss_get_default_display_name();
 	struct omap_dss_device *def_dssdev;
 	int i;

 	def_dssdev = NULL;

 	for (i = 0; i < pdata->num_devices; ++i) {
 		struct omap_dss_device *dssdev = pdata->devices[i];

 		if (dssdev->type != OMAP_DISPLAY_TYPE_SDI)
 			continue;

 		if (def_dssdev == NULL)
 			def_dssdev = dssdev;

 		if (def_disp_name != NULL &&
 				strcmp(dssdev->name, def_disp_name) == 0) {
 			def_dssdev = dssdev;
 			break;
 		}
 	}

 	return def_dssdev;
 }

 static int sdi_probe_pdata(struct platform_device *sdidev)
 {
 	struct omap_dss_device *plat_dssdev;
 	struct omap_dss_device *dssdev;
 	int r;

 	plat_dssdev = sdi_find_dssdev(sdidev);

 	if (!plat_dssdev)
 		return 0;

 	dssdev = dss_alloc_and_init_device(&sdidev->dev);
 	if (!dssdev)
 		return -ENOMEM;

 	dss_copy_device_pdata(dssdev, plat_dssdev);

 	r = sdi_init_display(dssdev);
 	if (r) {
 		DSSERR("device %s init failed: %d\n", dssdev->name, r);
 		dss_put_device(dssdev);
 		return r;
 	}

 	r = omapdss_output_set_device(&sdi.output, dssdev);
 	if (r) {
 		DSSERR("failed to connect output to new device: %s\n",
 				dssdev->name);
 		dss_put_device(dssdev);
 		return r;
 	}

 	r = dss_add_device(dssdev);
 	if (r) {
 		DSSERR("device %s register failed: %d\n", dssdev->name, r);
 		omapdss_output_unset_device(&sdi.output);
 		dss_put_device(dssdev);
 		return r;
 	}

 	return 0;
 }

 static void sdi_init_output(struct platform_device *pdev)
 {
 	struct omap_dss_output *out = &sdi.output;

 	out->pdev = pdev;
 	out->id = OMAP_DSS_OUTPUT_SDI;
 	out->type = OMAP_DISPLAY_TYPE_SDI;
 	out->name = "sdi.0";
 	out->dispc_channel = OMAP_DSS_CHANNEL_LCD;

 	dss_register_output(out);
 }

 static void __exit sdi_uninit_output(struct platform_device *pdev)
 {
 	struct omap_dss_output *out = &sdi.output;

 	dss_unregister_output(out);
 }

 static int omap_sdi_probe(struct platform_device *pdev)
 {
 	int r;

 	sdi_init_output(pdev);

 	r = sdi_probe_pdata(pdev);
 	if (r) {
 		sdi_uninit_output(pdev);
 		return r;
 	}

 	return 0;
 }

 static int __exit omap_sdi_remove(struct platform_device *pdev)
 {
 	dss_unregister_child_devices(&pdev->dev);

 	sdi_uninit_output(pdev);

 	return 0;
 }

 static struct platform_driver omap_sdi_driver = {
 	.probe		= omap_sdi_probe,
 	.remove         = __exit_p(omap_sdi_remove),
 	.driver         = {
 		.name   = "omapdss_sdi",
 		.owner  = THIS_MODULE,
 	},
 };

 int __init sdi_init_platform_driver(void)
 {
 	return platform_driver_register(&omap_sdi_driver);
 }

 void __exit sdi_uninit_platform_driver(void)
 {
 	platform_driver_unregister(&omap_sdi_driver);
 }
	/*
	* 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/delay.h>
	#include <linux/err.h>
	#include <linux/regulator/consumer.h>
	#include <linux/export.h>
	#include <linux/platform_device.h>
	#include <linux/string.h>

	#include <video/omapdss.h>
	#include "dss.h"

	static struct {
	bool update_enabled;
	struct regulator *vdds_sdi_reg;

	struct dss_lcd_mgr_config mgr_config;
	struct omap_video_timings timings;
	int datapairs;

	struct omap_dss_output output;
	} sdi;

	struct sdi_clk_calc_ctx {
	unsigned long pck_min, pck_max;

	struct dss_clock_info dss_cinfo;
	struct dispc_clock_info dispc_cinfo;
	};

	static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck,
	unsigned long pck, void *data)
	{
	struct sdi_clk_calc_ctx *ctx = data;

	ctx->dispc_cinfo.lck_div = lckd;
	ctx->dispc_cinfo.pck_div = pckd;
	ctx->dispc_cinfo.lck = lck;
	ctx->dispc_cinfo.pck = pck;

	return true;
	}

	static bool dpi_calc_dss_cb(int fckd, unsigned long fck, void *data)
	{
	struct sdi_clk_calc_ctx *ctx = data;

	ctx->dss_cinfo.fck = fck;
	ctx->dss_cinfo.fck_div = fckd;

	return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
	dpi_calc_dispc_cb, ctx);
	}

	static int sdi_calc_clock_div(unsigned long pclk,
	struct dss_clock_info *dss_cinfo,
	struct dispc_clock_info *dispc_cinfo)
	{
	int i;
	struct sdi_clk_calc_ctx ctx;

	/*
	* DSS fclk gives us very few possibilities, so finding a good pixel
	* clock may not be possible. We try multiple times to find the clock,
	* each time widening the pixel clock range we look for, up to
	* +/- 1MHz.
	*/

	for (i = 0; i < 10; ++i) {
	bool ok;

	memset(&ctx, 0, sizeof(ctx));
	if (pclk > 1000 * i * i * i)
	ctx.pck_min = max(pclk - 1000 * i * i * i, 0lu);
	else
	ctx.pck_min = 0;
	ctx.pck_max = pclk + 1000 * i * i * i;

	ok = dss_div_calc(ctx.pck_min, dpi_calc_dss_cb, &ctx);
	if (ok) {
	*dss_cinfo = ctx.dss_cinfo;
	*dispc_cinfo = ctx.dispc_cinfo;
	return 0;
	}
	}

	return -EINVAL;
	}

	static void sdi_config_lcd_manager(struct omap_dss_device *dssdev)
	{
	struct omap_overlay_manager *mgr = dssdev->output->manager;

	sdi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;

	sdi.mgr_config.stallmode = false;
	sdi.mgr_config.fifohandcheck = false;

	sdi.mgr_config.video_port_width = 24;
	sdi.mgr_config.lcden_sig_polarity = 1;

	dss_mgr_set_lcd_config(mgr, &sdi.mgr_config);
	}

	int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
	{
	struct omap_dss_output *out = dssdev->output;
	struct omap_video_timings *t = &sdi.timings;
	struct dss_clock_info dss_cinfo;
	struct dispc_clock_info dispc_cinfo;
	unsigned long pck;
	int r;

	if (out == NULL \|\| out->manager == NULL) {
	DSSERR("failed to enable display: no output/manager\n");
	return -ENODEV;
	}

	r = omap_dss_start_device(dssdev);
	if (r) {
	DSSERR("failed to start device\n");
	goto err_start_dev;
	}

	r = regulator_enable(sdi.vdds_sdi_reg);
	if (r)
	goto err_reg_enable;

	r = dispc_runtime_get();
	if (r)
	goto err_get_dispc;

	/* 15.5.9.1.2 */
	t->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
	t->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;

	r = sdi_calc_clock_div(t->pixel_clock * 1000, &dss_cinfo, &dispc_cinfo);
	if (r)
	goto err_calc_clock_div;

	sdi.mgr_config.clock_info = dispc_cinfo;

	pck = dss_cinfo.fck / dispc_cinfo.lck_div / dispc_cinfo.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;
	}


	dss_mgr_set_timings(out->manager, t);

	r = dss_set_clock_div(&dss_cinfo);
	if (r)
	goto err_set_dss_clock_div;

	sdi_config_lcd_manager(dssdev);

	/*
	* LCLK and PCLK divisors are located in shadow registers, and we
	* normally write them to DISPC registers when enabling the output.
	* However, SDI uses pck-free as source clock for its PLL, and pck-free
	* is affected by the divisors. And as we need the PLL before enabling
	* the output, we need to write the divisors early.
	*
	* It seems just writing to the DISPC register is enough, and we don't
	* need to care about the shadow register mechanism for pck-free. The
	* exact reason for this is unknown.
	*/
	dispc_mgr_set_clock_div(out->manager->id, &sdi.mgr_config.clock_info);

	dss_sdi_init(sdi.datapairs);
	r = dss_sdi_enable();
	if (r)
	goto err_sdi_enable;
	mdelay(2);

	r = dss_mgr_enable(out->manager);
	if (r)
	goto err_mgr_enable;

	return 0;

	err_mgr_enable:
	dss_sdi_disable();
	err_sdi_enable:
	err_set_dss_clock_div:
	err_calc_clock_div:
	dispc_runtime_put();
	err_get_dispc:
	regulator_disable(sdi.vdds_sdi_reg);
	err_reg_enable:
	omap_dss_stop_device(dssdev);
	err_start_dev:
	return r;
	}
	EXPORT_SYMBOL(omapdss_sdi_display_enable);

	void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
	{
	struct omap_overlay_manager *mgr = dssdev->output->manager;

	dss_mgr_disable(mgr);

	dss_sdi_disable();

	dispc_runtime_put();

	regulator_disable(sdi.vdds_sdi_reg);

	omap_dss_stop_device(dssdev);
	}
	EXPORT_SYMBOL(omapdss_sdi_display_disable);

	void omapdss_sdi_set_timings(struct omap_dss_device *dssdev,
	struct omap_video_timings *timings)
	{
	sdi.timings = *timings;
	}
	EXPORT_SYMBOL(omapdss_sdi_set_timings);

	void omapdss_sdi_set_datapairs(struct omap_dss_device *dssdev, int datapairs)
	{
	sdi.datapairs = datapairs;
	}
	EXPORT_SYMBOL(omapdss_sdi_set_datapairs);

	static int sdi_init_display(struct omap_dss_device *dssdev)
	{
	DSSDBG("SDI init\n");

	if (sdi.vdds_sdi_reg == NULL) {
	struct regulator *vdds_sdi;

	vdds_sdi = dss_get_vdds_sdi();

	if (IS_ERR(vdds_sdi)) {
	DSSERR("can't get VDDS_SDI regulator\n");
	return PTR_ERR(vdds_sdi);
	}

	sdi.vdds_sdi_reg = vdds_sdi;
	}

	return 0;
	}

	static struct omap_dss_device sdi_find_dssdev(struct platform_device pdev)
	{
	struct omap_dss_board_info *pdata = pdev->dev.platform_data;
	const char *def_disp_name = omapdss_get_default_display_name();
	struct omap_dss_device *def_dssdev;
	int i;

	def_dssdev = NULL;

	for (i = 0; i < pdata->num_devices; ++i) {
	struct omap_dss_device *dssdev = pdata->devices[i];

	if (dssdev->type != OMAP_DISPLAY_TYPE_SDI)
	continue;

	if (def_dssdev == NULL)
	def_dssdev = dssdev;

	if (def_disp_name != NULL &&
	strcmp(dssdev->name, def_disp_name) == 0) {
	def_dssdev = dssdev;
	break;
	}
	}

	return def_dssdev;
	}

	static int sdi_probe_pdata(struct platform_device *sdidev)
	{
	struct omap_dss_device *plat_dssdev;
	struct omap_dss_device *dssdev;
	int r;

	plat_dssdev = sdi_find_dssdev(sdidev);

	if (!plat_dssdev)
	return 0;

	dssdev = dss_alloc_and_init_device(&sdidev->dev);
	if (!dssdev)
	return -ENOMEM;

	dss_copy_device_pdata(dssdev, plat_dssdev);

	r = sdi_init_display(dssdev);
	if (r) {
	DSSERR("device %s init failed: %d\n", dssdev->name, r);
	dss_put_device(dssdev);
	return r;
	}

	r = omapdss_output_set_device(&sdi.output, dssdev);
	if (r) {
	DSSERR("failed to connect output to new device: %s\n",
	dssdev->name);
	dss_put_device(dssdev);
	return r;
	}

	r = dss_add_device(dssdev);
	if (r) {
	DSSERR("device %s register failed: %d\n", dssdev->name, r);
	omapdss_output_unset_device(&sdi.output);
	dss_put_device(dssdev);
	return r;
	}

	return 0;
	}

	static void sdi_init_output(struct platform_device *pdev)
	{
	struct omap_dss_output *out = &sdi.output;

	out->pdev = pdev;
	out->id = OMAP_DSS_OUTPUT_SDI;
	out->type = OMAP_DISPLAY_TYPE_SDI;
	out->name = "sdi.0";
	out->dispc_channel = OMAP_DSS_CHANNEL_LCD;

	dss_register_output(out);
	}

	static void __exit sdi_uninit_output(struct platform_device *pdev)
	{
	struct omap_dss_output *out = &sdi.output;

	dss_unregister_output(out);
	}

	static int omap_sdi_probe(struct platform_device *pdev)
	{
	int r;

	sdi_init_output(pdev);

	r = sdi_probe_pdata(pdev);
	if (r) {
	sdi_uninit_output(pdev);
	return r;
	}

	return 0;
	}

	static int __exit omap_sdi_remove(struct platform_device *pdev)
	{
	dss_unregister_child_devices(&pdev->dev);

	sdi_uninit_output(pdev);

	return 0;
	}

	static struct platform_driver omap_sdi_driver = {
	.probe = omap_sdi_probe,
	.remove = __exit_p(omap_sdi_remove),
	.driver = {
	.name = "omapdss_sdi",
	.owner = THIS_MODULE,
	},
	};

	int __init sdi_init_platform_driver(void)
	{
	return platform_driver_register(&omap_sdi_driver);
	}

	void __exit sdi_uninit_platform_driver(void)
	{
	platform_driver_unregister(&omap_sdi_driver);
	}