drivers/gpu/drm/omapdrm/dss/sdi.c - linux - Git at Google

 /*
  * 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 <linux/of.h>

 #include "omapdss.h"
 #include "dss.h"

 struct sdi_device {
 	struct platform_device *pdev;
 	struct dss_device *dss;

 	bool update_enabled;
 	struct regulator *vdds_sdi_reg;

 	struct dss_lcd_mgr_config mgr_config;
 	struct videomode vm;
 	int datapairs;

 	struct omap_dss_device output;
 };

 #define dssdev_to_sdi(dssdev) container_of(dssdev, struct sdi_device, output)

 struct sdi_clk_calc_ctx {
 	struct sdi_device *sdi;
 	unsigned long pck_min, pck_max;

 	unsigned long fck;
 	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(unsigned long fck, void *data)
 {
 	struct sdi_clk_calc_ctx *ctx = data;

 	ctx->fck = fck;

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

 static int sdi_calc_clock_div(struct sdi_device *sdi, unsigned long pclk,
 			      unsigned long *fck,
 			      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));

 		ctx.sdi = sdi;

 		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(sdi->dss, pclk, ctx.pck_min,
 				  dpi_calc_dss_cb, &ctx);
 		if (ok) {
 			*fck = ctx.fck;
 			*dispc_cinfo = ctx.dispc_cinfo;
 			return 0;
 		}
 	}

 	return -EINVAL;
 }

 static void sdi_config_lcd_manager(struct sdi_device *sdi)
 {
 	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(&sdi->output, &sdi->mgr_config);
 }

 static int sdi_display_enable(struct omap_dss_device *dssdev)
 {
 	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
 	struct videomode *vm = &sdi->vm;
 	unsigned long fck;
 	struct dispc_clock_info dispc_cinfo;
 	unsigned long pck;
 	int r;

 	if (!sdi->output.dispc_channel_connected) {
 		DSSERR("failed to enable display: no output/manager\n");
 		return -ENODEV;
 	}

 	r = regulator_enable(sdi->vdds_sdi_reg);
 	if (r)
 		goto err_reg_enable;

 	r = dispc_runtime_get(sdi->dss->dispc);
 	if (r)
 		goto err_get_dispc;

 	/* 15.5.9.1.2 */
 	vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE | DISPLAY_FLAGS_SYNC_POSEDGE;

 	r = sdi_calc_clock_div(sdi, vm->pixelclock, &fck, &dispc_cinfo);
 	if (r)
 		goto err_calc_clock_div;

 	sdi->mgr_config.clock_info = dispc_cinfo;

 	pck = fck / dispc_cinfo.lck_div / dispc_cinfo.pck_div;

 	if (pck != vm->pixelclock) {
 		DSSWARN("Could not find exact pixel clock. Requested %lu Hz, got %lu Hz\n",
 			vm->pixelclock, pck);

 		vm->pixelclock = pck;
 	}


 	dss_mgr_set_timings(&sdi->output, vm);

 	r = dss_set_fck_rate(sdi->dss, fck);
 	if (r)
 		goto err_set_dss_clock_div;

 	sdi_config_lcd_manager(sdi);

 	/*
 	 * 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(sdi->dss->dispc, sdi->output.dispc_channel,
 				&sdi->mgr_config.clock_info);

 	dss_sdi_init(sdi->dss, sdi->datapairs);
 	r = dss_sdi_enable(sdi->dss);
 	if (r)
 		goto err_sdi_enable;
 	mdelay(2);

 	r = dss_mgr_enable(&sdi->output);
 	if (r)
 		goto err_mgr_enable;

 	return 0;

 err_mgr_enable:
 	dss_sdi_disable(sdi->dss);
 err_sdi_enable:
 err_set_dss_clock_div:
 err_calc_clock_div:
 	dispc_runtime_put(sdi->dss->dispc);
 err_get_dispc:
 	regulator_disable(sdi->vdds_sdi_reg);
 err_reg_enable:
 	return r;
 }

 static void sdi_display_disable(struct omap_dss_device *dssdev)
 {
 	struct sdi_device *sdi = dssdev_to_sdi(dssdev);

 	dss_mgr_disable(&sdi->output);

 	dss_sdi_disable(sdi->dss);

 	dispc_runtime_put(sdi->dss->dispc);

 	regulator_disable(sdi->vdds_sdi_reg);
 }

 static void sdi_set_timings(struct omap_dss_device *dssdev,
 			    struct videomode *vm)
 {
 	struct sdi_device *sdi = dssdev_to_sdi(dssdev);

 	sdi->vm = *vm;
 }

 static void sdi_get_timings(struct omap_dss_device *dssdev,
 			    struct videomode *vm)
 {
 	struct sdi_device *sdi = dssdev_to_sdi(dssdev);

 	*vm = sdi->vm;
 }

 static int sdi_check_timings(struct omap_dss_device *dssdev,
 			     struct videomode *vm)
 {
 	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
 	enum omap_channel channel = dssdev->dispc_channel;

 	if (!dispc_mgr_timings_ok(sdi->dss->dispc, channel, vm))
 		return -EINVAL;

 	if (vm->pixelclock == 0)
 		return -EINVAL;

 	return 0;
 }

 static int sdi_init_regulator(struct sdi_device *sdi)
 {
 	struct regulator *vdds_sdi;

 	if (sdi->vdds_sdi_reg)
 		return 0;

 	vdds_sdi = devm_regulator_get(&sdi->pdev->dev, "vdds_sdi");
 	if (IS_ERR(vdds_sdi)) {
 		if (PTR_ERR(vdds_sdi) != -EPROBE_DEFER)
 			DSSERR("can't get VDDS_SDI regulator\n");
 		return PTR_ERR(vdds_sdi);
 	}

 	sdi->vdds_sdi_reg = vdds_sdi;

 	return 0;
 }

 static int sdi_connect(struct omap_dss_device *dssdev,
 		struct omap_dss_device *dst)
 {
 	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
 	int r;

 	r = sdi_init_regulator(sdi);
 	if (r)
 		return r;

 	r = dss_mgr_connect(&sdi->output, dssdev);
 	if (r)
 		return r;

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

 	return 0;
 }

 static void sdi_disconnect(struct omap_dss_device *dssdev,
 		struct omap_dss_device *dst)
 {
 	struct sdi_device *sdi = dssdev_to_sdi(dssdev);

 	WARN_ON(dst != dssdev->dst);

 	if (dst != dssdev->dst)
 		return;

 	omapdss_output_unset_device(dssdev);

 	dss_mgr_disconnect(&sdi->output, dssdev);
 }

 static const struct omapdss_sdi_ops sdi_ops = {
 	.connect = sdi_connect,
 	.disconnect = sdi_disconnect,

 	.enable = sdi_display_enable,
 	.disable = sdi_display_disable,

 	.check_timings = sdi_check_timings,
 	.set_timings = sdi_set_timings,
 	.get_timings = sdi_get_timings,
 };

 static void sdi_init_output(struct sdi_device *sdi)
 {
 	struct omap_dss_device *out = &sdi->output;

 	out->dev = &sdi->pdev->dev;
 	out->id = OMAP_DSS_OUTPUT_SDI;
 	out->output_type = OMAP_DISPLAY_TYPE_SDI;
 	out->name = "sdi.0";
 	out->dispc_channel = OMAP_DSS_CHANNEL_LCD;
 	/* We have SDI only on OMAP3, where it's on port 1 */
 	out->port_num = 1;
 	out->ops.sdi = &sdi_ops;
 	out->owner = THIS_MODULE;

 	omapdss_register_output(out);
 }

 static void sdi_uninit_output(struct sdi_device *sdi)
 {
 	omapdss_unregister_output(&sdi->output);
 }

 int sdi_init_port(struct dss_device *dss, struct platform_device *pdev,
 		  struct device_node *port)
 {
 	struct sdi_device *sdi;
 	struct device_node *ep;
 	u32 datapairs;
 	int r;

 	sdi = kzalloc(sizeof(*sdi), GFP_KERNEL);
 	if (!sdi)
 		return -ENOMEM;

 	ep = of_get_next_child(port, NULL);
 	if (!ep) {
 		r = 0;
 		goto err_free;
 	}

 	r = of_property_read_u32(ep, "datapairs", &datapairs);
 	if (r) {
 		DSSERR("failed to parse datapairs\n");
 		goto err_datapairs;
 	}

 	sdi->datapairs = datapairs;
 	sdi->dss = dss;

 	of_node_put(ep);

 	sdi->pdev = pdev;
 	port->data = sdi;

 	sdi_init_output(sdi);

 	return 0;

 err_datapairs:
 	of_node_put(ep);
 err_free:
 	kfree(sdi);

 	return r;
 }

 void sdi_uninit_port(struct device_node *port)
 {
 	struct sdi_device *sdi = port->data;

 	if (!sdi)
 		return;

 	sdi_uninit_output(sdi);
 	kfree(sdi);
 }
	/*
	* 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 <linux/of.h>

	#include "omapdss.h"
	#include "dss.h"

	struct sdi_device {
	struct platform_device *pdev;
	struct dss_device *dss;

	bool update_enabled;
	struct regulator *vdds_sdi_reg;

	struct dss_lcd_mgr_config mgr_config;
	struct videomode vm;
	int datapairs;

	struct omap_dss_device output;
	};

	#define dssdev_to_sdi(dssdev) container_of(dssdev, struct sdi_device, output)

	struct sdi_clk_calc_ctx {
	struct sdi_device *sdi;
	unsigned long pck_min, pck_max;

	unsigned long fck;
	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(unsigned long fck, void *data)
	{
	struct sdi_clk_calc_ctx *ctx = data;

	ctx->fck = fck;

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

	static int sdi_calc_clock_div(struct sdi_device *sdi, unsigned long pclk,
	unsigned long *fck,
	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));

	ctx.sdi = sdi;

	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(sdi->dss, pclk, ctx.pck_min,
	dpi_calc_dss_cb, &ctx);
	if (ok) {
	*fck = ctx.fck;
	*dispc_cinfo = ctx.dispc_cinfo;
	return 0;
	}
	}

	return -EINVAL;
	}

	static void sdi_config_lcd_manager(struct sdi_device *sdi)
	{
	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(&sdi->output, &sdi->mgr_config);
	}

	static int sdi_display_enable(struct omap_dss_device *dssdev)
	{
	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
	struct videomode *vm = &sdi->vm;
	unsigned long fck;
	struct dispc_clock_info dispc_cinfo;
	unsigned long pck;
	int r;

	if (!sdi->output.dispc_channel_connected) {
	DSSERR("failed to enable display: no output/manager\n");
	return -ENODEV;
	}

	r = regulator_enable(sdi->vdds_sdi_reg);
	if (r)
	goto err_reg_enable;

	r = dispc_runtime_get(sdi->dss->dispc);
	if (r)
	goto err_get_dispc;

	/* 15.5.9.1.2 */
	vm->flags \|= DISPLAY_FLAGS_PIXDATA_POSEDGE \| DISPLAY_FLAGS_SYNC_POSEDGE;

	r = sdi_calc_clock_div(sdi, vm->pixelclock, &fck, &dispc_cinfo);
	if (r)
	goto err_calc_clock_div;

	sdi->mgr_config.clock_info = dispc_cinfo;

	pck = fck / dispc_cinfo.lck_div / dispc_cinfo.pck_div;

	if (pck != vm->pixelclock) {
	DSSWARN("Could not find exact pixel clock. Requested %lu Hz, got %lu Hz\n",
	vm->pixelclock, pck);

	vm->pixelclock = pck;
	}


	dss_mgr_set_timings(&sdi->output, vm);

	r = dss_set_fck_rate(sdi->dss, fck);
	if (r)
	goto err_set_dss_clock_div;

	sdi_config_lcd_manager(sdi);

	/*
	* 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(sdi->dss->dispc, sdi->output.dispc_channel,
	&sdi->mgr_config.clock_info);

	dss_sdi_init(sdi->dss, sdi->datapairs);
	r = dss_sdi_enable(sdi->dss);
	if (r)
	goto err_sdi_enable;
	mdelay(2);

	r = dss_mgr_enable(&sdi->output);
	if (r)
	goto err_mgr_enable;

	return 0;

	err_mgr_enable:
	dss_sdi_disable(sdi->dss);
	err_sdi_enable:
	err_set_dss_clock_div:
	err_calc_clock_div:
	dispc_runtime_put(sdi->dss->dispc);
	err_get_dispc:
	regulator_disable(sdi->vdds_sdi_reg);
	err_reg_enable:
	return r;
	}

	static void sdi_display_disable(struct omap_dss_device *dssdev)
	{
	struct sdi_device *sdi = dssdev_to_sdi(dssdev);

	dss_mgr_disable(&sdi->output);

	dss_sdi_disable(sdi->dss);

	dispc_runtime_put(sdi->dss->dispc);

	regulator_disable(sdi->vdds_sdi_reg);
	}

	static void sdi_set_timings(struct omap_dss_device *dssdev,
	struct videomode *vm)
	{
	struct sdi_device *sdi = dssdev_to_sdi(dssdev);

	sdi->vm = *vm;
	}

	static void sdi_get_timings(struct omap_dss_device *dssdev,
	struct videomode *vm)
	{
	struct sdi_device *sdi = dssdev_to_sdi(dssdev);

	*vm = sdi->vm;
	}

	static int sdi_check_timings(struct omap_dss_device *dssdev,
	struct videomode *vm)
	{
	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
	enum omap_channel channel = dssdev->dispc_channel;

	if (!dispc_mgr_timings_ok(sdi->dss->dispc, channel, vm))
	return -EINVAL;

	if (vm->pixelclock == 0)
	return -EINVAL;

	return 0;
	}

	static int sdi_init_regulator(struct sdi_device *sdi)
	{
	struct regulator *vdds_sdi;

	if (sdi->vdds_sdi_reg)
	return 0;

	vdds_sdi = devm_regulator_get(&sdi->pdev->dev, "vdds_sdi");
	if (IS_ERR(vdds_sdi)) {
	if (PTR_ERR(vdds_sdi) != -EPROBE_DEFER)
	DSSERR("can't get VDDS_SDI regulator\n");
	return PTR_ERR(vdds_sdi);
	}

	sdi->vdds_sdi_reg = vdds_sdi;

	return 0;
	}

	static int sdi_connect(struct omap_dss_device *dssdev,
	struct omap_dss_device *dst)
	{
	struct sdi_device *sdi = dssdev_to_sdi(dssdev);
	int r;

	r = sdi_init_regulator(sdi);
	if (r)
	return r;

	r = dss_mgr_connect(&sdi->output, dssdev);
	if (r)
	return r;

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

	return 0;
	}

	static void sdi_disconnect(struct omap_dss_device *dssdev,
	struct omap_dss_device *dst)
	{
	struct sdi_device *sdi = dssdev_to_sdi(dssdev);

	WARN_ON(dst != dssdev->dst);

	if (dst != dssdev->dst)
	return;

	omapdss_output_unset_device(dssdev);

	dss_mgr_disconnect(&sdi->output, dssdev);
	}

	static const struct omapdss_sdi_ops sdi_ops = {
	.connect = sdi_connect,
	.disconnect = sdi_disconnect,

	.enable = sdi_display_enable,
	.disable = sdi_display_disable,

	.check_timings = sdi_check_timings,
	.set_timings = sdi_set_timings,
	.get_timings = sdi_get_timings,
	};

	static void sdi_init_output(struct sdi_device *sdi)
	{
	struct omap_dss_device *out = &sdi->output;

	out->dev = &sdi->pdev->dev;
	out->id = OMAP_DSS_OUTPUT_SDI;
	out->output_type = OMAP_DISPLAY_TYPE_SDI;
	out->name = "sdi.0";
	out->dispc_channel = OMAP_DSS_CHANNEL_LCD;
	/* We have SDI only on OMAP3, where it's on port 1 */
	out->port_num = 1;
	out->ops.sdi = &sdi_ops;
	out->owner = THIS_MODULE;

	omapdss_register_output(out);
	}

	static void sdi_uninit_output(struct sdi_device *sdi)
	{
	omapdss_unregister_output(&sdi->output);
	}

	int sdi_init_port(struct dss_device dss, struct platform_device pdev,
	struct device_node *port)
	{
	struct sdi_device *sdi;
	struct device_node *ep;
	u32 datapairs;
	int r;

	sdi = kzalloc(sizeof(*sdi), GFP_KERNEL);
	if (!sdi)
	return -ENOMEM;

	ep = of_get_next_child(port, NULL);
	if (!ep) {
	r = 0;
	goto err_free;
	}

	r = of_property_read_u32(ep, "datapairs", &datapairs);
	if (r) {
	DSSERR("failed to parse datapairs\n");
	goto err_datapairs;
	}

	sdi->datapairs = datapairs;
	sdi->dss = dss;

	of_node_put(ep);

	sdi->pdev = pdev;
	port->data = sdi;

	sdi_init_output(sdi);

	return 0;

	err_datapairs:
	of_node_put(ep);
	err_free:
	kfree(sdi);

	return r;
	}

	void sdi_uninit_port(struct device_node *port)
	{
	struct sdi_device *sdi = port->data;

	if (!sdi)
	return;

	sdi_uninit_output(sdi);
	kfree(sdi);
	}