path: root/drivers/video/omap2/dss/apply.c

/*
 * Copyright (C) 2011 Texas Instruments
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.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 "APPLY"

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/jiffies.h>

#include <video/omapdss.h>

#include "dss.h"
#include "dss_features.h"

/*
 * We have 4 levels of cache for the dispc settings. First two are in SW and
 * the latter two in HW.
 *
 *       set_info()
 *          v
 * +--------------------+
 * |     user_info      |
 * +--------------------+
 *          v
 *        apply()
 *          v
 * +--------------------+
 * |       info         |
 * +--------------------+
 *          v
 *      write_regs()
 *          v
 * +--------------------+
 * |  shadow registers  |
 * +--------------------+
 *          v
 * VFP or lcd/digit_enable
 *          v
 * +--------------------+
 * |      registers     |
 * +--------------------+
 */

struct ovl_priv_data {

	bool user_info_dirty;
	struct omap_overlay_info user_info;

	bool info_dirty;
	struct omap_overlay_info info;

	bool shadow_info_dirty;

	bool extra_info_dirty;
	bool shadow_extra_info_dirty;

	bool enabled;
	enum omap_channel channel;
	u32 fifo_low, fifo_high;

	/*
	 * True if overlay is to be enabled. Used to check and calculate configs
	 * for the overlay before it is enabled in the HW.
	 */
	bool enabling;
};

struct mgr_priv_data {

	bool user_info_dirty;
	struct omap_overlay_manager_info user_info;

	bool info_dirty;
	struct omap_overlay_manager_info info;

	bool shadow_info_dirty;

	/* If true, GO bit is up and shadow registers cannot be written.
	 * Never true for manual update displays */
	bool busy;

	/* If true, dispc output is enabled */
	bool updating;

	/* If true, a display is enabled using this manager */
	bool enabled;
};

static struct {
	struct ovl_priv_data ovl_priv_data_array[MAX_DSS_OVERLAYS];
	struct mgr_priv_data mgr_priv_data_array[MAX_DSS_MANAGERS];

	bool irq_enabled;
} dss_data;

/* protects dss_data */
static spinlock_t data_lock;
/* lock for blocking functions */
static DEFINE_MUTEX(apply_lock);
static DECLARE_COMPLETION(extra_updated_completion);

static void dss_register_vsync_isr(void);

static struct ovl_priv_data *get_ovl_priv(struct omap_overlay *ovl)
{
	return &dss_data.ovl_priv_data_array[ovl->id];
}

static struct mgr_priv_data *get_mgr_priv(struct omap_overlay_manager *mgr)
{
	return &dss_data.mgr_priv_data_array[mgr->id];
}

void dss_apply_init(void)
{
	const