OMAP: DSS2: Add more core files

Add more core files to DSS2.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

drivers/video/omap2/dss/display.c

+/*
+ * linux/drivers/video/omap2/dss/display.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 "DISPLAY"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+
+#include <plat/display.h>
+#include "dss.h"
+
+static LIST_HEAD(display_list);
+
+static ssize_t display_enabled_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	bool enabled = dssdev->state != OMAP_DSS_DISPLAY_DISABLED;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", enabled);
+}
+
+static ssize_t display_enabled_store(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t size)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	bool enabled, r;
+
+	enabled = simple_strtoul(buf, NULL, 10);
+
+	if (enabled != (dssdev->state != OMAP_DSS_DISPLAY_DISABLED)) {
+		if (enabled) {
+			r = dssdev->enable(dssdev);
+			if (r)
+				return r;
+		} else {
+			dssdev->disable(dssdev);
+		}
+	}
+
+	return size;
+}
+
+static ssize_t display_upd_mode_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	enum omap_dss_update_mode mode = OMAP_DSS_UPDATE_AUTO;
+	if (dssdev->get_update_mode)
+		mode = dssdev->get_update_mode(dssdev);
+	return snprintf(buf, PAGE_SIZE, "%d\n", mode);
+}
+
+static ssize_t display_upd_mode_store(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t size)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	int val, r;
+	enum omap_dss_update_mode mode;
+
+	val = simple_strtoul(buf, NULL, 10);
+
+	switch (val) {
+	case OMAP_DSS_UPDATE_DISABLED:
+	case OMAP_DSS_UPDATE_AUTO:
+	case OMAP_DSS_UPDATE_MANUAL:
+		mode = (enum omap_dss_update_mode)val;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	r = dssdev->set_update_mode(dssdev, mode);
+	if (r)
+		return r;
+
+	return size;
+}
+
+static ssize_t display_tear_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	return snprintf(buf, PAGE_SIZE, "%d\n",
+			dssdev->get_te ? dssdev->get_te(dssdev) : 0);
+}
+
+static ssize_t display_tear_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	unsigned long te;
+	int r;
+
+	if (!dssdev->enable_te || !dssdev->get_te)
+		return -ENOENT;
+
+	te = simple_strtoul(buf, NULL, 0);
+
+	r = dssdev->enable_te(dssdev, te);
+	if (r)
+		return r;
+
+	return size;
+}
+
+static ssize_t display_timings_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	struct omap_video_timings t;
+
+	if (!dssdev->get_timings)
+		return -ENOENT;
+
+	dssdev->get_timings(dssdev, &t);
+
+	return snprintf(buf, PAGE_SIZE, "%u,%u/%u/%u/%u,%u/%u/%u/%u\n",
+			t.pixel_clock,
+			t.x_res, t.hfp, t.hbp, t.hsw,
+			t.y_res, t.vfp, t.vbp, t.vsw);
+}
+
+static ssize_t display_timings_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	struct omap_video_timings t;
+	int r, found;
+
+	if (!dssdev->set_timings || !dssdev->check_timings)
+		return -ENOENT;
+
+	found = 0;
+#ifdef CONFIG_OMAP2_DSS_VENC
+	if (strncmp("pal", buf, 3) == 0) {
+		t = omap_dss_pal_timings;
+		found = 1;
+	} else if (strncmp("ntsc", buf, 4) == 0) {
+		t = omap_dss_ntsc_timings;
+		found = 1;
+	}
+#endif
+	if (!found && sscanf(buf, "%u,%hu/%hu/%hu/%hu,%hu/%hu/%hu/%hu",
+				&t.pixel_clock,
+				&t.x_res, &t.hfp, &t.hbp, &t.hsw,
+				&t.y_res, &t.vfp, &t.vbp, &t.vsw) != 9)
+		return -EINVAL;
+
+	r = dssdev->check_timings(dssdev, &t);
+	if (r)
+		return r;
+
+	dssdev->set_timings(dssdev, &t);
+
+	return size;
+}
+
+static ssize_t display_rotate_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	int rotate;
+	if (!dssdev->get_rotate)
+		return -ENOENT;
+	rotate = dssdev->get_rotate(dssdev);
+	return snprintf(buf, PAGE_SIZE, "%u\n", rotate);
+}
+
+static ssize_t display_rotate_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	unsigned long rot;
+	int r;
+
+	if (!dssdev->set_rotate || !dssdev->get_rotate)
+		return -ENOENT;
+
+	rot = simple_strtoul(buf, NULL, 0);
+
+	r = dssdev->set_rotate(dssdev, rot);
+	if (r)
+		return r;
+
+	return size;
+}
+
+static ssize_t display_mirror_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	int mirror;
+	if (!dssdev->get_mirror)
+		return -ENOENT;
+	mirror = dssdev->get_mirror(dssdev);
+	return snprintf(buf, PAGE_SIZE, "%u\n", mirror);
+}
+
+static ssize_t display_mirror_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	unsigned long mirror;
+	int r;
+
+	if (!dssdev->set_mirror || !dssdev->get_mirror)
+		return -ENOENT;
+
+	mirror = simple_strtoul(buf, NULL, 0);
+
+	r = dssdev->set_mirror(dssdev, mirror);
+	if (r)
+		return r;
+
+	return size;
+}
+
+static ssize_t display_wss_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	unsigned int wss;
+
+	if (!dssdev->get_wss)
+		return -ENOENT;
+
+	wss = dssdev->get_wss(dssdev);
+
+	return snprintf(buf, PAGE_SIZE, "0x%05x\n", wss);
+}
+
+static ssize_t display_wss_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	unsigned long wss;
+	int r;
+
+	if (!dssdev->get_wss || !dssdev->set_wss)
+		return -ENOENT;
+
+	if (strict_strtoul(buf, 0, &wss))
+		return -EINVAL;
+
+	if (wss > 0xfffff)
+		return -EINVAL;
+
+	r = dssdev->set_wss(dssdev, wss);
+	if (r)
+		return r;
+
+	return size;
+}
+
+static DEVICE_ATTR(enabled, S_IRUGO|S_IWUSR,
+		display_enabled_show, display_enabled_store);
+static DEVICE_ATTR(update_mode, S_IRUGO|S_IWUSR,
+		display_upd_mode_show, display_upd_mode_store);
+static DEVICE_ATTR(tear_elim, S_IRUGO|S_IWUSR,
+		display_tear_show, display_tear_store);
+static DEVICE_ATTR(timings, S_IRUGO|S_IWUSR,
+		display_timings_show, display_timings_store);
+static DEVICE_ATTR(rotate, S_IRUGO|S_IWUSR,
+		display_rotate_show, display_rotate_store);
+static DEVICE_ATTR(mirror, S_IRUGO|S_IWUSR,
+		display_mirror_show, display_mirror_store);
+static DEVICE_ATTR(wss, S_IRUGO|S_IWUSR,
+		display_wss_show, display_wss_store);
+
+static struct device_attribute *display_sysfs_attrs[] = {
+	&dev_attr_enabled,
+	&dev_attr_update_mode,
+	&dev_attr_tear_elim,
+	&dev_attr_timings,
+	&dev_attr_rotate,
+	&dev_attr_mirror,
+	&dev_attr_wss,
+	NULL
+};
+
+static void default_get_resolution(struct omap_dss_device *dssdev,
+			u16 *xres, u16 *yres)
+{
+	*xres = dssdev->panel.timings.x_res;
+	*yres = dssdev->panel.timings.y_res;
+}
+
+void default_get_overlay_fifo_thresholds(enum omap_plane plane,
+		u32 fifo_size, enum omap_burst_size *burst_size,
+		u32 *fifo_low, u32 *fifo_high)
+{
+	unsigned burst_size_bytes;
+
+	*burst_size = OMAP_DSS_BURST_16x32;
+	burst_size_bytes = 16 * 32 / 8;
+
+	*fifo_high = fifo_size - 1;
+	*fifo_low = fifo_size - burst_size_bytes;
+}
+
+static int default_wait_vsync(struct omap_dss_device *dssdev)
+{
+	unsigned long timeout = msecs_to_jiffies(500);
+	u32 irq;
+
+	if (dssdev->type == OMAP_DISPLAY_TYPE_VENC)
+		irq = DISPC_IRQ_EVSYNC_ODD;
+	else
+		irq = DISPC_IRQ_VSYNC;
+
+	return omap_dispc_wait_for_irq_interruptible_timeout(irq, timeout);
+}
+
+static int default_get_recommended_bpp(struct omap_dss_device *dssdev)
+{
+	if (dssdev->panel.recommended_bpp)
+		return dssdev->panel.recommended_bpp;
+
+	switch (dssdev->type) {
+	case OMAP_DISPLAY_TYPE_DPI:
+		if (dssdev->phy.dpi.data_lines == 24)
+			return 24;
+		else
+			return 16;
+
+	case OMAP_DISPLAY_TYPE_DBI:
+	case OMAP_DISPLAY_TYPE_DSI:
+		if (dssdev->ctrl.pixel_size == 24)
+			return 24;
+		else
+			return 16;
+	case OMAP_DISPLAY_TYPE_VENC:
+	case OMAP_DISPLAY_TYPE_SDI:
+		return 24;
+		return 24;
+	default:
+		BUG();
+	}
+}
+
+/* Checks if replication logic should be used. Only use for active matrix,
+ * when overlay is in RGB12U or RGB16 mode, and LCD interface is
+ * 18bpp or 24bpp */
+bool dss_use_replication(struct omap_dss_device *dssdev,
+		enum omap_color_mode mode)
+{
+	int bpp;
+
+	if (mode != OMAP_DSS_COLOR_RGB12U && mode != OMAP_DSS_COLOR_RGB16)
+		return false;
+
+	if (dssdev->type == OMAP_DISPLAY_TYPE_DPI &&
+			(dssdev->panel.config & OMAP_DSS_LCD_TFT) == 0)
+		return false;
+
+	switch (dssdev->type) {
+	case OMAP_DISPLAY_TYPE_DPI:
+		bpp = dssdev->phy.dpi.data_lines;
+		break;
+	case OMAP_DISPLAY_TYPE_VENC:
+	case OMAP_DISPLAY_TYPE_SDI:
+		bpp = 24;
+		break;
+	case OMAP_DISPLAY_TYPE_DBI:
+	case OMAP_DISPLAY_TYPE_DSI:
+		bpp = dssdev->ctrl.pixel_size;
+		break;
+	default:
+		BUG();
+	}
+
+	return bpp > 16;
+}
+
+void dss_init_device(struct platform_device *pdev,
+		struct omap_dss_device *dssdev)
+{
+	struct device_attribute *attr;
+	int i;
+	int r;
+
+	switch (dssdev->type) {
+	case OMAP_DISPLAY_TYPE_DPI:
+#ifdef CONFIG_OMAP2_DSS_RFBI
+	case OMAP_DISPLAY_TYPE_DBI:
+#endif
+#ifdef CONFIG_OMAP2_DSS_SDI
+	case OMAP_DISPLAY_TYPE_SDI:
+#endif
+#ifdef CONFIG_OMAP2_DSS_DSI
+	case OMAP_DISPLAY_TYPE_DSI:
+#endif
+#ifdef CONFIG_OMAP2_DSS_VENC
+	case OMAP_DISPLAY_TYPE_VENC:
+#endif
+		break;
+	default:
+		DSSERR("Support for display '%s' not compiled in.\n",
+				dssdev->name);
+		return;
+	}
+
+	dssdev->get_resolution = default_get_resolution;
+	dssdev->get_recommended_bpp = default_get_recommended_bpp;
+	dssdev->wait_vsync = default_wait_vsync;
+
+	switch (dssdev->type) {
+	case OMAP_DISPLAY_TYPE_DPI:
+		r = dpi_init_display(dssdev);
+		break;
+#ifdef CONFIG_OMAP2_DSS_RFBI
+	case OMAP_DISPLAY_TYPE_DBI:
+		r = rfbi_init_display(dssdev);
+		break;
+#endif
+#ifdef CONFIG_OMAP2_DSS_VENC
+	case OMAP_DISPLAY_TYPE_VENC:
+		r = venc_init_display(dssdev);
+		break;
+#endif
+#ifdef CONFIG_OMAP2_DSS_SDI
+	case OMAP_DISPLAY_TYPE_SDI:
+		r = sdi_init_display(dssdev);
+		break;
+#endif
+#ifdef CONFIG_OMAP2_DSS_DSI
+	case OMAP_DISPLAY_TYPE_DSI:
+		r = dsi_init_display(dssdev);
+		break;
+#endif
+	default:
+		BUG();
+	}
+
+	if (r) {
+		DSSERR("failed to init display %s\n", dssdev->name);
+		return;
+	}
+
+	/* create device sysfs files */
+	i = 0;
+	while ((attr = display_sysfs_attrs[i++]) != NULL) {
+		r = device_create_file(&dssdev->dev, attr);
+		if (r)
+			DSSERR("failed to create sysfs file\n");
+	}
+
+	/* create display? sysfs links */
+	r = sysfs_create_link(&pdev->dev.kobj, &dssdev->dev.kobj,
+			dev_name(&dssdev->dev));
+	if (r)
+		DSSERR("failed to create sysfs display link\n");
+}
+
+void dss_uninit_device(struct platform_device *pdev,
+		struct omap_dss_device *dssdev)
+{
+	struct device_attribute *attr;
+	int i = 0;
+
+	sysfs_remove_link(&pdev->dev.kobj, dev_name(&dssdev->dev));
+
+	while ((attr = display_sysfs_attrs[i++]) != NULL)
+		device_remove_file(&dssdev->dev, attr);
+
+	if (dssdev->manager)
+		dssdev->manager->unset_device(dssdev->manager);
+}
+
+static int dss_suspend_device(struct device *dev, void *data)
+{
+	int r;
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+
+	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
+		dssdev->activate_after_resume = false;
+		return 0;
+	}
+
+	if (!dssdev->suspend) {
+		DSSERR("display '%s' doesn't implement suspend\n",
+				dssdev->name);
+		return -ENOSYS;
+	}
+
+	r = dssdev->suspend(dssdev);
+	if (r)
+		return r;
+
+	dssdev->activate_after_resume = true;
+
+	return 0;
+}
+
+int dss_suspend_all_devices(void)
+{
+	int r;
+	struct bus_type *bus = dss_get_bus();
+
+	r = bus_for_each_dev(bus, NULL, NULL, dss_suspend_device);
+	if (r) {
+		/* resume all displays that were suspended */
+		dss_resume_all_devices();
+		return r;
+	}
+
+	return 0;
+}
+
+static int dss_resume_device(struct device *dev, void *data)
+{
+	int r;
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+
+	if (dssdev->activate_after_resume && dssdev->resume) {
+		r = dssdev->resume(dssdev);
+		if (r)
+			return r;
+	}
+
+	dssdev->activate_after_resume = false;
+
+	return 0;
+}
+
+int dss_resume_all_devices(void)
+{
+	struct bus_type *bus = dss_get_bus();
+
+	return bus_for_each_dev(bus, NULL, NULL, dss_resume_device);
+}
+
+static int dss_disable_device(struct device *dev, void *data)
+{
+	struct omap_dss_device *dssdev = to_dss_device(dev);
+	dssdev->disable(dssdev);
+	return 0;
+}
+
+void dss_disable_all_devices(void)
+{
+	struct bus_type *bus = dss_get_bus();
+	bus_for_each_dev(bus, NULL, NULL, dss_disable_device);
+}
+
+
+void omap_dss_get_device(struct omap_dss_device *dssdev)
+{
+	get_device(&dssdev->dev);
+}
+EXPORT_SYMBOL(omap_dss_get_device);
+
+void omap_dss_put_device(struct omap_dss_device *dssdev)
+{
+	put_device(&dssdev->dev);
+}
+EXPORT_SYMBOL(omap_dss_put_device);
+
+/* ref count of the found device is incremented. ref count
+ * of from-device is decremented. */
+struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from)
+{
+	struct device *dev;
+	struct device *dev_start = NULL;
+	struct omap_dss_device *dssdev = NULL;
+
+	int match(struct device *dev, void *data)
+	{
+		/* skip panels connected to controllers */
+		if (to_dss_device(dev)->panel.ctrl)
+			return 0;
+
+		return 1;
+	}
+
+	if (from)
+		dev_start = &from->dev;
+	dev = bus_find_device(dss_get_bus(), dev_start, NULL, match);
+	if (dev)
+		dssdev = to_dss_device(dev);
+	if (from)
+		put_device(&from->dev);
+
+	return dssdev;
+}
+EXPORT_SYMBOL(omap_dss_get_next_device);
+
+struct omap_dss_device *omap_dss_find_device(void *data,
+		int (*match)(struct omap_dss_device *dssdev, void *data))
+{
+	struct omap_dss_device *dssdev = NULL;
+
+	while ((dssdev = omap_dss_get_next_device(dssdev)) != NULL) {
+		if (match(dssdev, data))
+			return dssdev;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(omap_dss_find_device);
+
+int omap_dss_start_device(struct omap_dss_device *dssdev)
+{
+	int r;
+
+	if (!dssdev->driver) {
+		DSSDBG("no driver\n");
+		r = -ENODEV;
+		goto err0;
+	}
+
+	if (dssdev->ctrl.panel && !dssdev->ctrl.panel->driver) {
+		DSSDBG("no panel driver\n");
+		r = -ENODEV;
+		goto err0;
+	}
+
+	if (!try_module_get(dssdev->dev.driver->owner)) {
+		r = -ENODEV;
+		goto err0;
+	}
+
+	if (dssdev->ctrl.panel) {
+		if (!try_module_get(dssdev->ctrl.panel->dev.driver->owner)) {
+			r = -ENODEV;
+			goto err1;
+		}
+	}
+
+	return 0;
+err1:
+	module_put(dssdev->dev.driver->owner);
+err0:
+	return r;
+}
+EXPORT_SYMBOL(omap_dss_start_device);
+
+void omap_dss_stop_device(struct omap_dss_device *dssdev)
+{
+	if (dssdev->ctrl.panel)
+		module_put(dssdev->ctrl.panel->dev.driver->owner);
+
+	module_put(dssdev->dev.driver->owner);
+}
+EXPORT_SYMBOL(omap_dss_stop_device);
+

drivers/video/omap2/dss/manager.c

+/*
+ * linux/drivers/video/omap2/dss/manager.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 "MANAGER"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/jiffies.h>
+
+#include <plat/display.h>
+#include <plat/cpu.h>
+
+#include "dss.h"
+
+static int num_managers;
+static struct list_head manager_list;
+
+static ssize_t manager_name_show(struct omap_overlay_manager *mgr, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%s\n", mgr->name);
+}
+
+static ssize_t manager_display_show(struct omap_overlay_manager *mgr, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			mgr->device ? mgr->device->name : "<none>");
+}
+
+static ssize_t manager_display_store(struct omap_overlay_manager *mgr,
+		const char *buf, size_t size)
+{
+	int r = 0;
+	size_t len = size;
+	struct omap_dss_device *dssdev = NULL;
+
+	int match(struct omap_dss_device *dssdev, void *data)
+	{
+		const char *str = data;
+		return sysfs_streq(dssdev->name, str);
+	}
+
+	if (buf[size-1] == '\n')
+		--len;
+
+	if (len > 0)
+		dssdev = omap_dss_find_device((void *)buf, match);
+
+	if (len > 0 && dssdev == NULL)
+		return -EINVAL;
+
+	if (dssdev)
+		DSSDBG("display %s found\n", dssdev->name);
+
+	if (mgr->device) {
+		r = mgr->unset_device(mgr);
+		if (r) {
+			DSSERR("failed to unset display\n");
+			goto put_device;
+		}
+	}
+
+	if (dssdev) {
+		r = mgr->set_device(mgr, dssdev);
+		if (r) {
+			DSSERR("failed to set manager\n");
+			goto put_device;
+		}
+
+		r = mgr->apply(mgr);
+		if (r) {
+			DSSERR("failed to apply dispc config\n");
+			goto put_device;
+		}
+	}
+
+put_device:
+	if (dssdev)
+		omap_dss_put_device(dssdev);
+
+	return r ? r : size;
+}
+
+static ssize_t manager_default_color_show(struct omap_overlay_manager *mgr,
+					  char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", mgr->info.default_color);
+}
+
+static ssize_t manager_default_color_store(struct omap_overlay_manager *mgr,
+					   const char *buf, size_t size)
+{
+	struct omap_overlay_manager_info info;
+	u32 color;
+	int r;
+
+	if (sscanf(buf, "%d", &color) != 1)
+		return -EINVAL;
+
+	mgr->get_manager_info(mgr, &info);
+
+	info.default_color = color;
+
+	r = mgr->set_manager_info(mgr, &info);
+	if (r)
+		return r;
+
+	r = mgr->apply(mgr);
+	if (r)
+		return r;
+
+	return size;
+}
+
+static const char *trans_key_type_str[] = {
+	"gfx-destination",
+	"video-source",
+};
+
+static ssize_t manager_trans_key_type_show(struct omap_overlay_manager *mgr,
+					   char *buf)
+{
+	enum omap_dss_trans_key_type key_type;
+
+	key_type = mgr->info.trans_key_type;
+	BUG_ON(key_type >= ARRAY_SIZE(trans_key_type_str));
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", trans_key_type_str[key_type]);
+}
+
+static ssize_t manager_trans_key_type_store(struct omap_overlay_manager *mgr,
+					    const char *buf, size_t size)
+{
+	enum omap_dss_trans_key_type key_type;
+	struct omap_overlay_manager_info info;
+	int r;
+
+	for (key_type = OMAP_DSS_COLOR_KEY_GFX_DST;
+			key_type < ARRAY_SIZE(trans_key_type_str); key_type++) {
+		if (sysfs_streq(buf, trans_key_type_str[key_type]))
+			break;
+	}
+
+	if (key_type == ARRAY_SIZE(trans_key_type_str))
+		return -EINVAL;
+
+	mgr->get_manager_info(mgr, &info);
+
+	info.trans_key_type = key_type;
+
+	r = mgr->set_manager_info(mgr, &info);
+	if (r)
+		return r;
+
+	r = mgr->apply(mgr);
+	if (r)
+		return r;
+
+	return size;
+}
+
+static ssize_t manager_trans_key_value_show(struct omap_overlay_manager *mgr,
+					    char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", mgr->info.trans_key);
+}
+
+static ssize_t manager_trans_key_value_store(struct omap_overlay_manager *mgr,
+					     const char *buf, size_t size)
+{
+	struct omap_overlay_manager_info info;
+	u32 key_value;
+	int r;
+
+	if (sscanf(buf, "%d", &key_value) != 1)
+		return -EINVAL;
+
+	mgr->get_manager_info(mgr, &info);
+
+	info.trans_key = key_value;
+
+	r = mgr->set_manager_info(mgr, &info);
+	if (r)
+		return r;
+
+	r = mgr->apply(mgr);
+	if (r)
+		return r;
+
+	return size;
+}
+
+static ssize_t manager_trans_key_enabled_show(struct omap_overlay_manager *mgr,
+					      char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", mgr->info.trans_enabled);
+}
+
+static ssize_t manager_trans_key_enabled_store(struct omap_overlay_manager *mgr,
+					       const char *buf, size_t size)
+{
+	struct omap_overlay_manager_info info;
+	int enable;
+	int r;
+
+	if (sscanf(buf, "%d", &enable) != 1)
+		return -EINVAL;
+
+	mgr->get_manager_info(mgr, &info);
+
+	info.trans_enabled = enable ? true : false;
+
+	r = mgr->set_manager_info(mgr, &info);
+	if (r)
+		return r;
+
+	r = mgr->apply(mgr);
+	if (r)
+		return r;
+
+	return size;
+}
+
+static ssize_t manager_alpha_blending_enabled_show(
+		struct omap_overlay_manager *mgr, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", mgr->info.alpha_enabled);
+}
+
+static ssize_t manager_alpha_blending_enabled_store(
+		struct omap_overlay_manager *mgr,
+		const char *buf, size_t size)
+{
+	struct omap_overlay_manager_info info;
+	int enable;
+	int r;
+
+	if (sscanf(buf, "%d", &enable) != 1)
+		return -EINVAL;
+
+	mgr->get_manager_info(mgr, &info);
+
+	info.alpha_enabled = enable ? true : false;
+
+	r = mgr->set_manager_info(mgr, &info);
+	if (r)
+		return r;
+
+	r = mgr->apply(mgr);
+	if (r)
+		return r;
+
+	return size;
+}
+
+struct manager_attribute {
+	struct attribute attr;
+	ssize_t (*show)(struct omap_overlay_manager *, char *);
+	ssize_t	(*store)(struct omap_overlay_manager *, const char *, size_t);
+};
+
+#define MANAGER_ATTR(_name, _mode, _show, _store) \
+	struct manager_attribute manager_attr_##_name = \
+	__ATTR(_name, _mode, _show, _store)
+
+static MANAGER_ATTR(name, S_IRUGO, manager_name_show, NULL);
+static MANAGER_ATTR(display, S_IRUGO|S_IWUSR,
+		manager_display_show, manager_display_store);
+static MANAGER_ATTR(default_color, S_IRUGO|S_IWUSR,
+		manager_default_color_show, manager_default_color_store);
+static MANAGER_ATTR(trans_key_type, S_IRUGO|S_IWUSR,
+		manager_trans_key_type_show, manager_trans_key_type_store);
+static MANAGER_ATTR(trans_key_value, S_IRUGO|S_IWUSR,
+		manager_trans_key_value_show, manager_trans_key_value_store);
+static MANAGER_ATTR(trans_key_enabled, S_IRUGO|S_IWUSR,
+		manager_trans_key_enabled_show,
+		manager_trans_key_enabled_store);
+static MANAGER_ATTR(alpha_blending_enabled, S_IRUGO|S_IWUSR,
+		manager_alpha_blending_enabled_show,
+		manager_alpha_blending_enabled_store);
+
+
+static struct attribute *manager_sysfs_attrs[] = {
+	&manager_attr_name.attr,
+	&manager_attr_display.attr,
+	&manager_attr_default_color.attr,
+	&manager_attr_trans_key_type.attr,
+	&manager_attr_trans_key_value.attr,
+	&manager_attr_trans_key_enabled.attr,
+	&manager_attr_alpha_blending_enabled.attr,
+	NULL
+};
+
+static ssize_t manager_attr_show(struct kobject *kobj, struct attribute *attr,
+		char *buf)
+{
+	struct omap_overlay_manager *manager;
+	struct manager_attribute *manager_attr;
+
+	manager = container_of(kobj, struct omap_overlay_manager, kobj);
+	manager_attr = container_of(attr, struct manager_attribute, attr);
+
+	if (!manager_attr->show)
+		return -ENOENT;
+
+	return manager_attr->show(manager, buf);
+}
+
+static ssize_t manager_attr_store(struct kobject *kobj, struct attribute *attr,
+		const char *buf, size_t size)
+{
+	struct omap_overlay_manager *manager;
+	struct manager_attribute *manager_attr;
+
+	manager = container_of(kobj, struct omap_overlay_manager, kobj);
+	manager_attr = container_of(attr, struct manager_attribute, attr);
+
+	if (!manager_attr->store)
+		return -ENOENT;
+
+	return manager_attr->store(manager, buf, size);
+}
+
+static struct sysfs_ops manager_sysfs_ops = {
+	.show = manager_attr_show,
+	.store = manager_attr_store,
+};
+
+static struct kobj_type manager_ktype = {
+	.sysfs_ops = &manager_sysfs_ops,
+	.default_attrs = manager_sysfs_attrs,
+};
+
+/*
+ * We have 4 levels of cache for the dispc settings. First two are in SW and
+ * the latter two in HW.
+ *
+ * +--------------------+
+ * |overlay/manager_info|
+ * +--------------------+
+ *          v
+ *        apply()
+ *          v
+ * +--------------------+
+ * |     dss_cache      |
+ * +--------------------+
+ *          v
+ *      configure()
+ *          v
+ * +--------------------+
+ * |  shadow registers  |
+ * +--------------------+
+ *          v
+ * VFP or lcd/digit_enable
+ *          v
+ * +--------------------+
+ * |      registers     |
+ * +--------------------+
+ */
+
+struct overlay_cache_data {
+	/* If true, cache changed, but not written to shadow registers. Set
+	 * in apply(), cleared when registers written. */
+	bool dirty;
+	/* If true, shadow registers contain changed values not yet in real
+	 * registers. Set when writing to shadow registers, cleared at
+	 * VSYNC/EVSYNC */
+	bool shadow_dirty;
+
+	bool enabled;
+
+	u32 paddr;
+	void __iomem *vaddr;
+	u16 screen_width;
+	u16 width;
+	u16 height;
+	enum omap_color_mode color_mode;
+	u8 rotation;
+	enum omap_dss_rotation_type rotation_type;
+	bool mirror;
+
+	u16 pos_x;
+	u16 pos_y;
+	u16 out_width;	/* if 0, out_width == width */
+	u16 out_height;	/* if 0, out_height == height */
+	u8 global_alpha;
+
+	enum omap_channel channel;
+	bool replication;
+	bool ilace;
+
+	enum omap_burst_size burst_size;
+	u32 fifo_low;
+	u32 fifo_high;
+
+	bool manual_update;
+};
+
+struct manager_cache_data {
+	/* If true, cache changed, but not written to shadow registers. Set
+	 * in apply(), cleared when registers written. */
+	bool dirty;
+	/* If true, shadow registers contain changed values not yet in real
+	 * registers. Set when writing to shadow registers, cleared at
+	 * VSYNC/EVSYNC */
+	bool shadow_dirty;
+
+	u32 default_color;
+
+	enum omap_dss_trans_key_type trans_key_type;
+	u32 trans_key;
+	bool trans_enabled;
+
+	bool alpha_enabled;
+
+	bool manual_upd_display;
+	bool manual_update;
+	bool do_manual_update;
+
+	/* manual update region */
+	u16 x, y, w, h;
+};
+
+static struct {
+	spinlock_t lock;
+	struct overlay_cache_data overlay_cache[3];
+	struct manager_cache_data manager_cache[2];
+
+	bool irq_enabled;
+} dss_cache;
+
+
+
+static int omap_dss_set_device(struct omap_overlay_manager *mgr,
+		struct omap_dss_device *dssdev)
+{
+	int i;
+	int r;
+
+	if (dssdev->manager) {
+		DSSERR("display '%s' already has a manager '%s'\n",
+			       dssdev->name, dssdev->manager->name);
+		return -EINVAL;
+	}
+
+	if ((mgr->supported_displays & dssdev->type) == 0) {
+		DSSERR("display '%s' does not support manager '%s'\n",
+			       dssdev->name, mgr->name);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < mgr->num_overlays; i++) {
+		struct omap_overlay *ovl = mgr->overlays[i];
+
+		if (ovl->manager != mgr || !ovl->info.enabled)
+			continue;
+
+		r = dss_check_overlay(ovl, dssdev);
+		if (r)
+			return r;
+	}
+
+	dssdev->manager = mgr;
+	mgr->device = dssdev;
+	mgr->device_changed = true;
+
+	return 0;
+}
+
+static int omap_dss_unset_device(struct omap_overlay_manager *mgr)
+{
+	if (!mgr->device) {
+		DSSERR("failed to unset display, display not set.\n");
+		return -EINVAL;
+	}
+
+	mgr->device->manager = NULL;
+	mgr->device = NULL;
+	mgr->device_changed = true;
+
+	return 0;
+}
+
+static int dss_mgr_wait_for_go(struct omap_overlay_manager *mgr)
+{
+	unsigned long timeout = msecs_to_jiffies(500);
+	struct manager_cache_data *mc;
+	enum omap_channel channel;
+	u32 irq;
+	int r;
+	int i;
+
+	if (!mgr->device)
+		return 0;
+
+	if (mgr->device->type == OMAP_DISPLAY_TYPE_VENC) {
+		irq = DISPC_IRQ_EVSYNC_ODD | DISPC_IRQ_EVSYNC_EVEN;
+		channel = OMAP_DSS_CHANNEL_DIGIT;
+	} else {
+		if (mgr->device->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE) {
+			enum omap_dss_update_mode mode;
+			mode = mgr->device->get_update_mode(mgr->device);
+			if (mode != OMAP_DSS_UPDATE_AUTO)
+				return 0;
+
+			irq = DISPC_IRQ_FRAMEDONE;
+		} else {
+			irq = DISPC_IRQ_VSYNC;
+		}
+		channel = OMAP_DSS_CHANNEL_LCD;
+	}
+
+	mc = &dss_cache.manager_cache[mgr->id];
+	i = 0;
+	while (1) {
+		unsigned long flags;
+		bool shadow_dirty, dirty;
+
+		spin_lock_irqsave(&dss_cache.lock, flags);
+		dirty = mc->dirty;
+		shadow_dirty = mc->shadow_dirty;
+		spin_unlock_irqrestore(&dss_cache.lock, flags);
+
+		if (!dirty && !shadow_dirty) {
+			r = 0;
+			break;
+		}
+
+		/* 4 iterations is the worst case:
+		 * 1 - initial iteration, dirty = true (between VFP and VSYNC)
+		 * 2 - first VSYNC, dirty = true
+		 * 3 - dirty = false, shadow_dirty = true
+		 * 4 - shadow_dirty = false */
+		if (i++ == 3) {
+			DSSERR("mgr(%d)->wait_for_go() not finishing\n",
+					mgr->id);
+			r = 0;
+			break;
+		}
+
+		r = omap_dispc_wait_for_irq_interruptible_timeout(irq, timeout);
+		if (r == -ERESTARTSYS)
+			break;
+
+		if (r) {
+			DSSERR("mgr(%d)->wait_for_go() timeout\n", mgr->id);
+			break;
+		}
+	}
+
+	return r;
+}
+
+int dss_mgr_wait_for_go_ovl(struct omap_overlay *ovl)
+{
+	unsigned long timeout = msecs_to_jiffies(500);
+	enum omap_channel channel;
+	struct overlay_cache_data *oc;
+	struct omap_dss_device *dssdev;
+	u32 irq;
+	int r;
+	int i;
+
+	if (!ovl->manager || !ovl->manager->device)
+		return 0;
+
+	dssdev = ovl->manager->device;
+
+	if (dssdev->type == OMAP_DISPLAY_TYPE_VENC) {
+		irq = DISPC_IRQ_EVSYNC_ODD | DISPC_IRQ_EVSYNC_EVEN;
+		channel = OMAP_DSS_CHANNEL_DIGIT;
+	} else {
+		if (dssdev->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE) {
+			enum omap_dss_update_mode mode;
+			mode = dssdev->get_update_mode(dssdev);
+			if (mode != OMAP_DSS_UPDATE_AUTO)
+				return 0;
+
+			irq = DISPC_IRQ_FRAMEDONE;
+		} else {
+			irq = DISPC_IRQ_VSYNC;
+		}
+		channel = OMAP_DSS_CHANNEL_LCD;
+	}
+
+	oc = &dss_cache.overlay_cache[ovl->id];
+	i = 0;
+	while (1) {
+		unsigned long flags;
+		bool shadow_dirty, dirty;
+
+		spin_lock_irqsave(&dss_cache.lock, flags);
+		dirty = oc->dirty;
+		shadow_dirty = oc->shadow_dirty;
+		spin_unlock_irqrestore(&dss_cache.lock, flags);
+
+		if (!dirty && !shadow_dirty) {
+			r = 0;
+			break;
+		}
+
+		/* 4 iterations is the worst case:
+		 * 1 - initial iteration, dirty = true (between VFP and VSYNC)
+		 * 2 - first VSYNC, dirty = true
+		 * 3 - dirty = false, shadow_dirty = true
+		 * 4 - shadow_dirty = false */
+		if (i++ == 3) {
+			DSSERR("ovl(%d)->wait_for_go() not finishing\n",
+					ovl->id);
+			r = 0;
+			break;
+		}
+
+		r = omap_dispc_wait_for_irq_interruptible_timeout(irq, timeout);
+		if (r == -ERESTARTSYS)
+			break;
+
+		if (r) {
+			DSSERR("ovl(%d)->wait_for_go() timeout\n", ovl->id);
+			break;
+		}
+	}
+
+	return r;
+}
+
+static int overlay_enabled(struct omap_overlay *ovl)
+{
+	return ovl->info.enabled && ovl->manager && ovl->manager->device;
+}
+
+/* Is rect1 a subset of rect2? */
+static bool rectangle_subset(int x1, int y1, int w1, int h1,
+		int x2, int y2, int w2, int h2)
+{
+	if (x1 < x2 || y1 < y2)
+		return false;
+
+	if (x1 + w1 > x2 + w2)
+		return false;
+
+	if (y1 + h1 > y2 + h2)
+		return false;
+
+	return true;
+}
+
+/* Do rect1 and rect2 overlap? */
+static bool rectangle_intersects(int x1, int y1, int w1, int h1,
+		int x2, int y2, int w2, int h2)
+{
+	if (x1 >= x2 + w2)
+		return false;
+
+	if (x2 >= x1 + w1)
+		return false;
+
+	if (y1 >= y2 + h2)
+		return false;
+
+	if (y2 >= y1 + h1)
+		return false;
+
+	return true;
+}
+
+static bool dispc_is_overlay_scaled(struct overlay_cache_data *oc)
+{
+	if (oc->out_width != 0 && oc->width != oc->out_width)
+		return true;
+
+	if (oc->out_height != 0 && oc->height != oc->out_height)
+		return true;
+
+	return false;
+}
+
+static int configure_overlay(enum omap_plane plane)
+{
+	struct overlay_cache_data *c;
+	struct manager_cache_data *mc;
+	u16 outw, outh;
+	u16 x, y, w, h;
+	u32 paddr;
+	int r;
+
+	DSSDBGF("%d", plane);
+
+	c = &dss_cache.overlay_cache[plane];
+
+	if (!c->enabled) {
+		dispc_enable_plane(plane, 0);
+		return 0;
+	}
+
+	mc = &dss_cache.manager_cache[c->channel];
+
+	x = c->pos_x;
+	y = c->pos_y;
+	w = c->width;
+	h = c->height;
+	outw = c->out_width == 0 ? c->width : c->out_width;
+	outh = c->out_height == 0 ? c->height : c->out_height;
+	paddr = c->paddr;
+
+	if (c->manual_update && mc->do_manual_update) {
+		unsigned bpp;
+		/* If the overlay is outside the update region, disable it */
+		if (!rectangle_intersects(mc->x, mc->y, mc->w, mc->h,
+					x, y, outw, outh)) {
+			dispc_enable_plane(plane, 0);
+			return 0;
+		}
+
+		switch (c->color_mode) {
+		case OMAP_DSS_COLOR_RGB16:
+		case OMAP_DSS_COLOR_ARGB16:
+		case OMAP_DSS_COLOR_YUV2:
+		case OMAP_DSS_COLOR_UYVY:
+			bpp = 16;
+			break;
+
+		case OMAP_DSS_COLOR_RGB24P:
+			bpp = 24;
+			break;
+
+		case OMAP_DSS_COLOR_RGB24U:
+		case OMAP_DSS_COLOR_ARGB32:
+		case OMAP_DSS_COLOR_RGBA32:
+		case OMAP_DSS_COLOR_RGBX32:
+			bpp = 32;
+			break;
+
+		default:
+			BUG();
+		}
+
+		if (dispc_is_overlay_scaled(c)) {
+			/* If the overlay is scaled, the update area has
+			 * already been enlarged to cover the whole overlay. We
+			 * only need to adjust x/y here */
+			x = c->pos_x - mc->x;
+			y = c->pos_y - mc->y;
+		} else {
+			if (mc->x > c->pos_x) {
+				x = 0;
+				w -= (mc->x - c->pos_x);
+				paddr += (mc->x - c->pos_x) * bpp / 8;
+			} else {
+				x = c->pos_x - mc->x;
+			}
+
+			if (mc->y > c->pos_y) {
+				y = 0;
+				h -= (mc->y - c->pos_y);
+				paddr += (mc->y - c->pos_y) * c->screen_width *
+					bpp / 8;
+			} else {
+				y = c->pos_y - mc->y;
+			}
+
+			if (mc->w < (x+w))
+				w -= (x+w) - (mc->w);
+
+			if (mc->h < (y+h))
+				h -= (y+h) - (mc->h);
+
+			outw = w;
+			outh = h;
+		}
+	}
+
+	r = dispc_setup_plane(plane,
+			paddr,
+			c->screen_width,
+			x, y,
+			w, h,
+			outw, outh,
+			c->color_mode,
+			c->ilace,
+			c->rotation_type,
+			c->rotation,
+			c->mirror,
+			c->global_alpha);
+
+	if (r) {
+		/* this shouldn't happen */
+		DSSERR("dispc_setup_plane failed for ovl %d\n", plane);
+		dispc_enable_plane(plane, 0);
+		return r;
+	}
+
+	dispc_enable_replication(plane, c->replication);
+
+	dispc_set_burst_size(plane, c->burst_size);
+	dispc_setup_plane_fifo(plane, c->fifo_low, c->fifo_high);
+
+	dispc_enable_plane(plane, 1);
+
+	return 0;
+}
+
+static void configure_manager(enum omap_channel channel)
+{
+	struct manager_cache_data *c;
+
+	DSSDBGF("%d", channel);
+
+	c = &dss_cache.manager_cache[channel];
+
+	dispc_set_trans_key(channel, c->trans_key_type, c->trans_key);
+	dispc_enable_trans_key(channel, c->trans_enabled);
+	dispc_enable_alpha_blending(channel, c->alpha_enabled);
+}
+
+/* configure_dispc() tries to write values from cache to shadow registers.
+ * It writes only to those managers/overlays that are not busy.
+ * returns 0 if everything could be written to shadow registers.
+ * returns 1 if not everything could be written to shadow registers. */
+static int configure_dispc(void)
+{
+	struct overlay_cache_data *oc;
+	struct manager_cache_data *mc;
+	const int num_ovls = ARRAY_SIZE(dss_cache.overlay_cache);
+	const int num_mgrs = ARRAY_SIZE(dss_cache.manager_cache);
+	int i;
+	int r;
+	bool mgr_busy[2];
+	bool mgr_go[2];
+	bool busy;
+
+	r = 0;
+	busy = false;
+
+	mgr_busy[0] = dispc_go_busy(0);
+	mgr_busy[1] = dispc_go_busy(1);
+	mgr_go[0] = false;
+	mgr_go[1] = false;
+
+	/* Commit overlay settings */
+	for (i = 0; i < num_ovls; ++i) {
+		oc = &dss_cache.overlay_cache[i];
+		mc = &dss_cache.manager_cache[oc->channel];
+
+		if (!oc->dirty)
+			continue;
+
+		if (oc->manual_update && !mc->do_manual_update)
+			continue;
+
+		if (mgr_busy[oc->channel]) {
+			busy = true;
+			continue;
+		}
+
+		r = configure_overlay(i);
+		if (r)
+			DSSERR("configure_overlay %d failed\n", i);
+
+		oc->dirty = false;
+		oc->shadow_dirty = true;
+		mgr_go[oc->channel] = true;
+	}
+
+	/* Commit manager settings */
+	for (i = 0; i < num_mgrs; ++i) {
+		mc = &dss_cache.manager_cache[i];
+
+		if (!mc->dirty)
+			continue;
+
+		if (mc->manual_update && !mc->do_manual_update)
+			continue;
+
+		if (mgr_busy[i]) {
+			busy = true;
+			continue;
+		}
+
+		configure_manager(i);
+		mc->dirty = false;
+		mc->shadow_dirty = true;
+		mgr_go[i] = true;
+	}
+
+	/* set GO */
+	for (i = 0; i < num_mgrs; ++i) {
+		mc = &dss_cache.manager_cache[i];
+
+		if (!mgr_go[i])
+			continue;
+
+		/* We don't need GO with manual update display. LCD iface will
+		 * always be turned off after frame, and new settings will be
+		 * taken in to use at next update */
+		if (!mc->manual_upd_display)
+			dispc_go(i);
+	}
+
+	if (busy)
+		r = 1;
+	else
+		r = 0;
+
+	return r;
+}
+
+/* Configure dispc for partial update. Return possibly modified update
+ * area */
+void dss_setup_partial_planes(struct omap_dss_device *dssdev,
+		u16 *xi, u16 *yi, u16 *wi, u16 *hi)
+{
+	struct overlay_cache_data *oc;
+	struct manager_cache_data *mc;
+	const int num_ovls = ARRAY_SIZE(dss_cache.overlay_cache);
+	struct omap_overlay_manager *mgr;
+	int i;
+	u16 x, y, w, h;
+	unsigned long flags;
+
+	x = *xi;
+	y = *yi;
+	w = *wi;
+	h = *hi;
+
+	DSSDBG("dispc_setup_partial_planes %d,%d %dx%d\n",
+		*xi, *yi, *wi, *hi);
+
+	mgr = dssdev->manager;
+
+	if (!mgr) {
+		DSSDBG("no manager\n");
+		return;
+	}
+
+	spin_lock_irqsave(&dss_cache.lock, flags);
+
+	/* We need to show the whole overlay if it is scaled. So look for
+	 * those, and make the update area larger if found.
+	 * Also mark the overlay cache dirty */
+	for (i = 0; i < num_ovls; ++i) {
+		unsigned x1, y1, x2, y2;
+		unsigned outw, outh;
+
+		oc = &dss_cache.overlay_cache[i];
+
+		if (oc->channel != mgr->id)
+			continue;
+
+		oc->dirty = true;
+
+		if (!oc->enabled)
+			continue;
+
+		if (!dispc_is_overlay_scaled(oc))
+			continue;
+
+		outw = oc->out_width == 0 ? oc->width : oc->out_width;
+		outh = oc->out_height == 0 ? oc->height : oc->out_height;
+
+		/* is the overlay outside the update region? */
+		if (!rectangle_intersects(x, y, w, h,
+					oc->pos_x, oc->pos_y,
+					outw, outh))
+			continue;
+
+		/* if the overlay totally inside the update region? */
+		if (rectangle_subset(oc->pos_x, oc->pos_y, outw, outh,
+					x, y, w, h))
+			continue;
+
+		if (x > oc->pos_x)
+			x1 = oc->pos_x;
+		else
+			x1 = x;
+
+		if (y > oc->pos_y)
+			y1 = oc->pos_y;
+		else
+			y1 = y;
+
+		if ((x + w) < (oc->pos_x + outw))
+			x2 = oc->pos_x + outw;
+		else
+			x2 = x + w;
+
+		if ((y + h) < (oc->pos_y + outh))
+			y2 = oc->pos_y + outh;
+		else
+			y2 = y + h;
+
+		x = x1;
+		y = y1;
+		w = x2 - x1;
+		h = y2 - y1;
+
+		DSSDBG("changing upd area due to ovl(%d) scaling %d,%d %dx%d\n",
+				i, x, y, w, h);
+	}
+
+	mc = &dss_cache.manager_cache[mgr->id];
+	mc->do_manual_update = true;
+	mc->x = x;
+	mc->y = y;
+	mc->w = w;
+	mc->h = h;
+
+	configure_dispc();
+
+	mc->do_manual_update = false;
+
+	spin_unlock_irqrestore(&dss_cache.lock, flags);
+
+	*xi = x;
+	*yi = y;
+	*wi = w;
+	*hi = h;
+}
+
+void dss_start_update(struct omap_dss_device *dssdev)
+{
+	struct manager_cache_data *mc;
+	struct overlay_cache_data *oc;
+	const int num_ovls = ARRAY_SIZE(dss_cache.overlay_cache);
+	const int num_mgrs = ARRAY_SIZE(dss_cache.manager_cache);
+	struct omap_overlay_manager *mgr;
+	int i;
+
+	mgr = dssdev->manager;
+
+	for (i = 0; i < num_ovls; ++i) {
+		oc = &dss_cache.overlay_cache[i];
+		if (oc->channel != mgr->id)
+			continue;
+
+		oc->shadow_dirty = false;
+	}
+
+	for (i = 0; i < num_mgrs; ++i) {
+		mc = &dss_cache.manager_cache[i];
+		if (mgr->id != i)
+			continue;
+
+		mc->shadow_dirty = false;
+	}
+
+	dispc_enable_lcd_out(1);
+}
+
+static void dss_apply_irq_handler(void *data, u32 mask)
+{
+	struct manager_cache_data *mc;
+	struct overlay_cache_data *oc;
+	const int num_ovls = ARRAY_SIZE(dss_cache.overlay_cache);
+	const int num_mgrs = ARRAY_SIZE(dss_cache.manager_cache);
+	int i, r;
+	bool mgr_busy[2];
+
+	mgr_busy[0] = dispc_go_busy(0);
+	mgr_busy[1] = dispc_go_busy(1);
+
+	spin_lock(&dss_cache.lock);
+
+	for (i = 0; i < num_ovls; ++i) {
+		oc = &dss_cache.overlay_cache[i];
+		if (!mgr_busy[oc->channel])
+			oc->shadow_dirty = false;
+	}
+
+	for (i = 0; i < num_mgrs; ++i) {
+		mc = &dss_cache.manager_cache[i];
+		if (!mgr_busy[i])
+			mc->shadow_dirty = false;
+	}
+
+	r = configure_dispc();
+	if (r == 1)
+		goto end;
+
+	/* re-read busy flags */
+	mgr_busy[0] = dispc_go_busy(0);
+	mgr_busy[1] = dispc_go_busy(1);
+
+	/* keep running as long as there are busy managers, so that
+	 * we can collect overlay-applied information */
+	for (i = 0; i < num_mgrs; ++i) {
+		if (mgr_busy[i])
+			goto end;
+	}
+
+	omap_dispc_unregister_isr(dss_apply_irq_handler, NULL,
+			DISPC_IRQ_VSYNC	| DISPC_IRQ_EVSYNC_ODD |
+			DISPC_IRQ_EVSYNC_EVEN);
+	dss_cache.irq_enabled = false;
+
+end:
+	spin_unlock(&dss_cache.lock);
+}
+
+static int omap_dss_mgr_apply(struct omap_overlay_manager *mgr)
+{
+	struct overlay_cache_data *oc;
+	struct manager_cache_data *mc;
+	int i;
+	struct omap_overlay *ovl;
+	int num_planes_enabled = 0;
+	bool use_fifomerge;
+	unsigned long flags;
+	int r;
+
+	DSSDBG("omap_dss_mgr_apply(%s)\n", mgr->name);
+
+	spin_lock_irqsave(&dss_cache.lock, flags);
+
+	/* Configure overlays */
+	for (i = 0; i < omap_dss_get_num_overlays(); ++i) {
+		struct omap_dss_device *dssdev;
+
+		ovl = omap_dss_get_overlay(i);
+
+		if (!(ovl->caps & OMAP_DSS_OVL_CAP_DISPC))
+			continue;
+
+		oc = &dss_cache.overlay_cache[ovl->id];
+
+		if (!overlay_enabled(ovl)) {
+			if (oc->enabled) {
+				oc->enabled = false;
+				oc->dirty = true;
+			}
+			continue;
+		}
+
+		if (!ovl->info_dirty) {
+			if (oc->enabled)
+				++num_planes_enabled;
+			continue;
+		}
+
+		dssdev = ovl->manager->device;
+
+		if (dss_check_overlay(ovl, dssdev)) {
+			if (oc->enabled) {
+				oc->enabled = false;
+				oc->dirty = true;
+			}
+			continue;
+		}
+
+		ovl->info_dirty = false;
+		oc->dirty = true;
+
+		oc->paddr = ovl->info.paddr;
+		oc->vaddr = ovl->info.vaddr;
+		oc->screen_width = ovl->info.screen_width;
+		oc->width = ovl->info.width;
+		oc->height = ovl->info.height;
+		oc->color_mode = ovl->info.color_mode;
+		oc->rotation = ovl->info.rotation;
+		oc->rotation_type = ovl->info.rotation_type;
+		oc->mirror = ovl->info.mirror;
+		oc->pos_x = ovl->info.pos_x;
+		oc->pos_y = ovl->info.pos_y;
+		oc->out_width = ovl->info.out_width;
+		oc->out_height = ovl->info.out_height;
+		oc->global_alpha = ovl->info.global_alpha;
+
+		oc->replication =
+			dss_use_replication(dssdev, ovl->info.color_mode);
+
+		oc->ilace = dssdev->type == OMAP_DISPLAY_TYPE_VENC;
+
+		oc->channel = ovl->manager->id;
+
+		oc->enabled = true;
+
+		oc->manual_update =
+			dssdev->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE &&
+			dssdev->get_update_mode(dssdev) != OMAP_DSS_UPDATE_AUTO;
+
+		++num_planes_enabled;
+	}
+
+	/* Configure managers */
+	list_for_each_entry(mgr, &manager_list, list) {
+		struct omap_dss_device *dssdev;
+
+		if (!(mgr->caps & OMAP_DSS_OVL_MGR_CAP_DISPC))
+			continue;
+
+		mc = &dss_cache.manager_cache[mgr->id];
+
+		if (mgr->device_changed) {
+			mgr->device_changed = false;
+			mgr->info_dirty  = true;
+		}
+
+		if (!mgr->info_dirty)
+			continue;
+
+		if (!mgr->device)
+			continue;
+
+		dssdev = mgr->device;
+
+		mgr->info_dirty = false;
+		mc->dirty = true;
+
+		mc->default_color = mgr->info.default_color;
+		mc->trans_key_type = mgr->info.trans_key_type;
+		mc->trans_key = mgr->info.trans_key;
+		mc->trans_enabled = mgr->info.trans_enabled;
+		mc->alpha_enabled = mgr->info.alpha_enabled;
+
+		mc->manual_upd_display =
+			dssdev->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE;
+
+		mc->manual_update =
+			dssdev->caps & OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE &&
+			dssdev->get_update_mode(dssdev) != OMAP_DSS_UPDATE_AUTO;
+	}
+
+	/* XXX TODO: Try to get fifomerge working. The problem is that it
+	 * affects both managers, not individually but at the same time. This
+	 * means the change has to be well synchronized. I guess the proper way
+	 * is to have a two step process for fifo merge:
+	 *        fifomerge enable:
+	 *             1. disable other planes, leaving one plane enabled
+	 *             2. wait until the planes are disabled on HW
+	 *             3. config merged fifo thresholds, enable fifomerge
+	 *        fifomerge disable:
+	 *             1. config unmerged fifo thresholds, disable fifomerge
+	 *             2. wait until fifo changes are in HW
+	 *             3. enable planes
+	 */
+	use_fifomerge = false;
+
+	/* Configure overlay fifos */
+	for (i = 0; i < omap_dss_get_num_overlays(); ++i) {
+		struct omap_dss_device *dssdev;
+		u32 size;
+
+		ovl = omap_dss_get_overlay(i);
+
+		if (!(ovl->caps & OMAP_DSS_OVL_CAP_DISPC))
+			continue;
+
+		oc = &dss_cache.overlay_cache[ovl->id];
+
+		if (!oc->enabled)
+			continue;
+
+		dssdev = ovl->manager->device;
+
+		size = dispc_get_plane_fifo_size(ovl->id);
+		if (use_fifomerge)
+			size *= 3;
+
+		switch (dssdev->type) {
+		case OMAP_DISPLAY_TYPE_DPI:
+		case OMAP_DISPLAY_TYPE_DBI:
+		case OMAP_DISPLAY_TYPE_SDI:
+		case OMAP_DISPLAY_TYPE_VENC:
+			default_get_overlay_fifo_thresholds(ovl->id, size,
+					&oc->burst_size, &oc->fifo_low,
+					&oc->fifo_high);
+			break;
+#ifdef CONFIG_OMAP2_DSS_DSI
+		case OMAP_DISPLAY_TYPE_DSI:
+			dsi_get_overlay_fifo_thresholds(ovl->id, size,
+					&oc->burst_size, &oc->fifo_low,
+					&oc->fifo_high);
+			break;
+#endif
+		default:
+			BUG();
+		}
+	}
+
+	r = 0;
+	dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
+	if (!dss_cache.irq_enabled) {
+		r = omap_dispc_register_isr(dss_apply_irq_handler, NULL,
+				DISPC_IRQ_VSYNC	| DISPC_IRQ_EVSYNC_ODD |
+				DISPC_IRQ_EVSYNC_EVEN);
+		dss_cache.irq_enabled = true;
+	}
+	configure_dispc();
+	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
+
+	spin_unlock_irqrestore(&dss_cache.lock, flags);
+
+	return r;
+}
+
+static int dss_check_manager(struct omap_overlay_manager *mgr)
+{
+	/* OMAP supports only graphics source transparency color key and alpha
+	 * blending simultaneously. See TRM 15.4.2.4.2.2 Alpha Mode */
+
+	if (mgr->info.alpha_enabled && mgr->info.trans_enabled &&
+			mgr->info.trans_key_type != OMAP_DSS_COLOR_KEY_GFX_DST)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int omap_dss_mgr_set_info(struct omap_overlay_manager *mgr,
+		struct omap_overlay_manager_info *info)
+{
+	int r;
+	struct omap_overlay_manager_info old_info;
+
+	old_info = mgr->info;
+	mgr->info = *info;
+
+	r = dss_check_manager(mgr);
+	if (r) {
+		mgr->info = old_info;
+		return r;
+	}
+
+	mgr->info_dirty = true;
+
+	return 0;
+}
+
+static void omap_dss_mgr_get_info(struct omap_overlay_manager *mgr,
+		struct omap_overlay_manager_info *info)
+{
+	*info = mgr->info;
+}
+
+static void omap_dss_add_overlay_manager(struct omap_overlay_manager *manager)
+{
+	++num_managers;
+	list_add_tail(&manager->list, &manager_list);
+}
+
+int dss_init_overlay_managers(struct platform_device *pdev)
+{
+	int i, r;
+
+	spin_lock_init(&dss_cache.lock);
+
+	INIT_LIST_HEAD(&manager_list);
+
+	num_managers = 0;
+
+	for (i = 0; i < 2; ++i) {
+		struct omap_overlay_manager *mgr;
+		mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
+
+		BUG_ON(mgr == NULL);
+
+		switch (i) {
+		case 0:
+			mgr->name = "lcd";
+			mgr->id = OMAP_DSS_CHANNEL_LCD;
+			mgr->supported_displays =
+				OMAP_DISPLAY_TYPE_DPI | OMAP_DISPLAY_TYPE_DBI |
+				OMAP_DISPLAY_TYPE_SDI | OMAP_DISPLAY_TYPE_DSI;
+			break;
+		case 1:
+			mgr->name = "tv";
+			mgr->id = OMAP_DSS_CHANNEL_DIGIT;
+			mgr->supported_displays = OMAP_DISPLAY_TYPE_VENC;
+			break;
+		}
+
+		mgr->set_device = &omap_dss_set_device;
+		mgr->unset_device = &omap_dss_unset_device;
+		mgr->apply = &omap_dss_mgr_apply;
+		mgr->set_manager_info = &omap_dss_mgr_set_info;
+		mgr->get_manager_info = &omap_dss_mgr_get_info;
+		mgr->wait_for_go = &dss_mgr_wait_for_go;
+
+		mgr->caps = OMAP_DSS_OVL_MGR_CAP_DISPC;
+
+		dss_overlay_setup_dispc_manager(mgr);
+
+		omap_dss_add_overlay_manager(mgr);
+
+		r = kobject_init_and_add(&mgr->kobj, &manager_ktype,
+				&pdev->dev.kobj, "manager%d", i);
+
+		if (r) {
+			DSSERR("failed to create sysfs file\n");
+			continue;
+		}
+	}
+
+#ifdef L4_EXAMPLE
+	{
+		int omap_dss_mgr_apply_l4(struct omap_overlay_manager *mgr)
+		{
+			DSSDBG("omap_dss_mgr_apply_l4(%s)\n", mgr->name);
+
+			return 0;
+		}
+
+		struct omap_overlay_manager *mgr;
+		mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
+
+		BUG_ON(mgr == NULL);
+
+		mgr->name = "l4";
+		mgr->supported_displays =
+			OMAP_DISPLAY_TYPE_DBI | OMAP_DISPLAY_TYPE_DSI;
+
+		mgr->set_device = &omap_dss_set_device;
+		mgr->unset_device = &omap_dss_unset_device;
+		mgr->apply = &omap_dss_mgr_apply_l4;
+		mgr->set_manager_info = &omap_dss_mgr_set_info;
+		mgr->get_manager_info = &omap_dss_mgr_get_info;
+
+		dss_overlay_setup_l4_manager(mgr);
+
+		omap_dss_add_overlay_manager(mgr);
+
+		r = kobject_init_and_add(&mgr->kobj, &manager_ktype,
+				&pdev->dev.kobj, "managerl4");
+
+		if (r)
+			DSSERR("failed to create sysfs file\n");
+	}
+#endif
+
+	return 0;
+}
+
+void dss_uninit_overlay_managers(struct platform_device *pdev)
+{
+	struct omap_overlay_manager *mgr;
+
+	while (!list_empty(&manager_list)) {
+		mgr = list_first_entry(&manager_list,
+				struct omap_overlay_manager, list);
+		list_del(&mgr->list);
+		kobject_del(&mgr->kobj);
+		kobject_put(&mgr->kobj);
+		kfree(mgr);
+	}
+
+	num_managers = 0;
+}
+
+int omap_dss_get_num_overlay_managers(void)
+{
+	return num_managers;
+}
+EXPORT_SYMBOL(omap_dss_get_num_overlay_managers);
+
+struct omap_overlay_manager *omap_dss_get_overlay_manager(int num)
+{
+	int i = 0;
+	struct omap_overlay_manager *mgr;
+
+	list_for_each_entry(mgr, &manager_list, list) {
+		if (i++ == num)
+			return mgr;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(omap_dss_get_overlay_manager);
+

drivers/video/omap2/dss/overlay.c

+/*
+ * linux/drivers/video/omap2/dss/overlay.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 "OVERLAY"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/sysfs.h>
+#include <linux/kobject.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+
+#include <plat/display.h>
+#include <plat/cpu.h>
+
+#include "dss.h"
+
+static int num_overlays;
+static struct list_head overlay_list;
+
+static ssize_t overlay_name_show(struct omap_overlay *ovl, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%s\n", ovl->name);
+}
+
+static ssize_t overlay_manager_show(struct omap_overlay *ovl, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			ovl->manager ? ovl->manager->name : "<none>");
+}
+
+static ssize_t overlay_manager_store(struct omap_overlay *ovl, const char *buf,
+		size_t size)
+{
+	int i, r;
+	struct omap_overlay_manager *mgr = NULL;
+	struct omap_overlay_manager *old_mgr;
+	int len = size;
+
+	if (buf[size-1] == '\n')
+		--len;
+
+	if (len > 0) {
+		for (i = 0; i < omap_dss_get_num_overlay_managers(); ++i) {
+			mgr = omap_dss_get_overlay_manager(i);
+
+			if (strncmp(buf, mgr->name, len) == 0)
+				break;
+
+			mgr = NULL;
+		}
+	}
+
+	if (len > 0 && mgr == NULL)
+		return -EINVAL;
+
+	if (mgr)
+		DSSDBG("manager %s found\n", mgr->name);
+
+	if (mgr == ovl->manager)
+		return size;
+
+	old_mgr = ovl->manager;
+
+	/* detach old manager */
+	if (old_mgr) {
+		r = ovl->unset_manager(ovl);
+		if (r) {
+			DSSERR("detach failed\n");
+			return r;
+		}
+
+		r = old_mgr->apply(old_mgr);
+		if (r)
+			return r;
+	}
+
+	if (mgr) {
+		r = ovl->set_manager(ovl, mgr);
+		if (r) {
+			DSSERR("Failed to attach overlay\n");
+			return r;
+		}
+
+		r = mgr->apply(mgr);
+		if (r)
+			return r;
+	}
+
+	return size;
+}
+
+static ssize_t overlay_input_size_show(struct omap_overlay *ovl, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d,%d\n",
+			ovl->info.width, ovl->info.height);
+}
+
+static ssize_t overlay_screen_width_show(struct omap_overlay *ovl, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", ovl->info.screen_width);
+}
+
+static ssize_t overlay_position_show(struct omap_overlay *ovl, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d,%d\n",
+			ovl->info.pos_x, ovl->info.pos_y);
+}
+
+static ssize_t overlay_position_store(struct omap_overlay *ovl,
+		const char *buf, size_t size)
+{
+	int r;
+	char *last;
+	struct omap_overlay_info info;
+
+	ovl->get_overlay_info(ovl, &info);
+
+	info.pos_x = simple_strtoul(buf, &last, 10);
+	++last;
+	if (last - buf >= size)
+		return -EINVAL;
+
+	info.pos_y = simple_strtoul(last, &last, 10);
+
+	r = ovl->set_overlay_info(ovl, &info);
+	if (r)
+		return r;
+
+	if (ovl->manager) {
+		r = ovl->manager->apply(ovl->manager);
+		if (r)
+			return r;
+	}
+
+	return size;
+}
+
+static ssize_t overlay_output_size_show(struct omap_overlay *ovl, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d,%d\n",
+			ovl->info.out_width, ovl->info.out_height);
+}
+
+static ssize_t overlay_output_size_store(struct omap_overlay *ovl,
+		const char *buf, size_t size)
+{
+	int r;
+	char *last;
+	struct omap_overlay_info info;
+
+	ovl->get_overlay_info(ovl, &info);
+
+	info.out_width = simple_strtoul(buf, &last, 10);
+	++last;
+	if (last - buf >= size)
+		return -EINVAL;
+
+	info.out_height = simple_strtoul(last, &last, 10);
+
+	r = ovl->set_overlay_info(ovl, &info);
+	if (r)
+		return r;
+
+	if (ovl->manager) {
+		r = ovl->manager->apply(ovl->manager);
+		if (r)
+			return r;
+	}
+
+	return size;
+}
+
+static ssize_t overlay_enabled_show(struct omap_overlay *ovl, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", ovl->info.enabled);
+}
+
+static ssize_t overlay_enabled_store(struct omap_overlay *ovl, const char *buf,
+		size_t size)
+{
+	int r;
+	struct omap_overlay_info info;
+
+	ovl->get_overlay_info(ovl, &info);
+
+	info.enabled = simple_strtoul(buf, NULL, 10);
+
+	r = ovl->set_overlay_info(ovl, &info);
+	if (r)
+		return r;
+
+	if (ovl->manager) {
+		r = ovl->manager->apply(ovl->manager);
+		if (r)
+			return r;
+	}
+
+	return size;
+}
+
+static ssize_t overlay_global_alpha_show(struct omap_overlay *ovl, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n",
+			ovl->info.global_alpha);
+}
+
+static ssize_t overlay_global_alpha_store(struct omap_overlay *ovl,
+		const char *buf, size_t size)
+{
+	int r;
+	struct omap_overlay_info info;
+
+	ovl->get_overlay_info(ovl, &info);
+
+	/* Video1 plane does not support global alpha
+	 * to always make it 255 completely opaque
+	 */
+	if (ovl->id == OMAP_DSS_VIDEO1)
+		info.global_alpha = 255;
+	else
+		info.global_alpha = simple_strtoul(buf, NULL, 10);
+
+	r = ovl->set_overlay_info(ovl, &info);
+	if (r)
+		return r;
+
+	if (ovl->manager) {
+		r = ovl->manager->apply(ovl->manager);
+		if (r)
+			return r;
+	}
+
+	return size;
+}
+
+struct overlay_attribute {
+	struct attribute attr;
+	ssize_t (*show)(struct omap_overlay *, char *);
+	ssize_t	(*store)(struct omap_overlay *, const char *, size_t);
+};
+
+#define OVERLAY_ATTR(_name, _mode, _show, _store) \
+	struct overlay_attribute overlay_attr_##_name = \
+	__ATTR(_name, _mode, _show, _store)
+
+static OVERLAY_ATTR(name, S_IRUGO, overlay_name_show, NULL);
+static OVERLAY_ATTR(manager, S_IRUGO|S_IWUSR,
+		overlay_manager_show, overlay_manager_store);
+static OVERLAY_ATTR(input_size, S_IRUGO, overlay_input_size_show, NULL);
+static OVERLAY_ATTR(screen_width, S_IRUGO, overlay_screen_width_show, NULL);
+static OVERLAY_ATTR(position, S_IRUGO|S_IWUSR,
+		overlay_position_show, overlay_position_store);
+static OVERLAY_ATTR(output_size, S_IRUGO|S_IWUSR,
+		overlay_output_size_show, overlay_output_size_store);
+static OVERLAY_ATTR(enabled, S_IRUGO|S_IWUSR,
+		overlay_enabled_show, overlay_enabled_store);
+static OVERLAY_ATTR(global_alpha, S_IRUGO|S_IWUSR,
+		overlay_global_alpha_show, overlay_global_alpha_store);
+
+static struct attribute *overlay_sysfs_attrs[] = {
+	&overlay_attr_name.attr,
+	&overlay_attr_manager.attr,
+	&overlay_attr_input_size.attr,
+	&overlay_attr_screen_width.attr,
+	&overlay_attr_position.attr,
+	&overlay_attr_output_size.attr,
+	&overlay_attr_enabled.attr,
+	&overlay_attr_global_alpha.attr,
+	NULL
+};
+
+static ssize_t overlay_attr_show(struct kobject *kobj, struct attribute *attr,
+		char *buf)
+{
+	struct omap_overlay *overlay;
+	struct overlay_attribute *overlay_attr;
+
+	overlay = container_of(kobj, struct omap_overlay, kobj);
+	overlay_attr = container_of(attr, struct overlay_attribute, attr);
+
+	if (!overlay_attr->show)
+		return -ENOENT;
+
+	return overlay_attr->show(overlay, buf);
+}
+
+static ssize_t overlay_attr_store(struct kobject *kobj, struct attribute *attr,
+		const char *buf, size_t size)
+{
+	struct omap_overlay *overlay;
+	struct overlay_attribute *overlay_attr;
+
+	overlay = container_of(kobj, struct omap_overlay, kobj);
+	overlay_attr = container_of(attr, struct overlay_attribute, attr);
+
+	if (!overlay_attr->store)
+		return -ENOENT;
+
+	return overlay_attr->store(overlay, buf, size);
+}
+
+static struct sysfs_ops overlay_sysfs_ops = {
+	.show = overlay_attr_show,
+	.store = overlay_attr_store,
+};
+
+static struct kobj_type overlay_ktype = {
+	.sysfs_ops = &overlay_sysfs_ops,
+	.default_attrs = overlay_sysfs_attrs,
+};
+
+/* Check if overlay parameters are compatible with display */
+int dss_check_overlay(struct omap_overlay *ovl, struct omap_dss_device *dssdev)
+{
+	struct omap_overlay_info *info;
+	u16 outw, outh;
+	u16 dw, dh;
+
+	if (!dssdev)
+		return 0;
+
+	if (!ovl->info.enabled)
+		return 0;
+
+	info = &ovl->info;
+
+	if (info->paddr == 0) {
+		DSSDBG("check_overlay failed: paddr 0\n");
+		return -EINVAL;
+	}
+
+	dssdev->get_resolution(dssdev, &dw, &dh);
+
+	DSSDBG("check_overlay %d: (%d,%d %dx%d -> %dx%d) disp (%dx%d)\n",
+			ovl->id,
+			info->pos_x, info->pos_y,
+			info->width, info->height,
+			info->out_width, info->out_height,
+			dw, dh);
+
+	if ((ovl->caps & OMAP_DSS_OVL_CAP_SCALE) == 0) {
+		outw = info->width;
+		outh = info->height;
+	} else {
+		if (info->out_width == 0)
+			outw = info->width;
+		else
+			outw = info->out_width;
+
+		if (info->out_height == 0)
+			outh = info->height;
+		else
+			outh = info->out_height;
+	}
+
+	if (dw < info->pos_x + outw) {
+		DSSDBG("check_overlay failed 1: %d < %d + %d\n",
+				dw, info->pos_x, outw);
+		return -EINVAL;
+	}
+
+	if (dh < info->pos_y + outh) {
+		DSSDBG("check_overlay failed 2: %d < %d + %d\n",
+				dh, info->pos_y, outh);
+		return -EINVAL;
+	}
+
+	if ((ovl->supported_modes & info->color_mode) == 0) {
+		DSSERR("overlay doesn't support mode %d\n", info->color_mode);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int dss_ovl_set_overlay_info(struct omap_overlay *ovl,
+		struct omap_overlay_info *info)
+{
+	int r;
+	struct omap_overlay_info old_info;
+
+	old_info = ovl->info;
+	ovl->info = *info;
+
+	if (ovl->manager) {
+		r = dss_check_overlay(ovl, ovl->manager->device);
+		if (r) {
+			ovl->info = old_info;
+			return r;
+		}
+	}
+
+	ovl->info_dirty = true;
+
+	return 0;
+}
+
+static void dss_ovl_get_overlay_info(struct omap_overlay *ovl,
+		struct omap_overlay_info *info)
+{
+	*info = ovl->info;
+}
+
+static int dss_ovl_wait_for_go(struct omap_overlay *ovl)
+{
+	return dss_mgr_wait_for_go_ovl(ovl);
+}
+
+static int omap_dss_set_manager(struct omap_overlay *ovl,
+		struct omap_overlay_manager *mgr)
+{
+	if (!mgr)
+		return -EINVAL;
+
+	if (ovl->manager) {
+		DSSERR("overlay '%s' already has a manager '%s'\n",
+				ovl->name, ovl->manager->name);
+		return -EINVAL;
+	}
+
+	if (ovl->info.enabled) {
+		DSSERR("overlay has to be disabled to change the manager\n");
+		return -EINVAL;
+	}
+
+	ovl->manager = mgr;
+
+	dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
+	/* XXX: on manual update display, in auto update mode, a bug happens
+	 * here. When an overlay is first enabled on LCD, then it's disabled,
+	 * and the manager is changed to TV, we sometimes get SYNC_LOST_DIGIT
+	 * errors. Waiting before changing the channel_out fixes it. I'm
+	 * guessing that the overlay is still somehow being used for the LCD,
+	 * but I don't understand how or why. */
+	msleep(40);
+	dispc_set_channel_out(ovl->id, mgr->id);
+	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
+
+	return 0;
+}
+
+static int omap_dss_unset_manager(struct omap_overlay *ovl)
+{
+	int r;
+
+	if (!ovl->manager) {
+		DSSERR("failed to detach overlay: manager not set\n");
+		return -EINVAL;
+	}
+
+	if (ovl->info.enabled) {
+		DSSERR("overlay has to be disabled to unset the manager\n");
+		return -EINVAL;
+	}
+
+	r = ovl->wait_for_go(ovl);
+	if (r)
+		return r;
+
+	ovl->manager = NULL;
+
+	return 0;
+}
+
+int omap_dss_get_num_overlays(void)
+{
+	return num_overlays;
+}
+EXPORT_SYMBOL(omap_dss_get_num_overlays);
+
+struct omap_overlay *omap_dss_get_overlay(int num)
+{
+	int i = 0;
+	struct omap_overlay *ovl;
+
+	list_for_each_entry(ovl, &overlay_list, list) {
+		if (i++ == num)
+			return ovl;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(omap_dss_get_overlay);
+
+static void omap_dss_add_overlay(struct omap_overlay *overlay)
+{
+	++num_overlays;
+	list_add_tail(&overlay->list, &overlay_list);
+}
+
+static struct omap_overlay *dispc_overlays[3];
+
+void dss_overlay_setup_dispc_manager(struct omap_overlay_manager *mgr)
+{
+	mgr->num_overlays = 3;
+	mgr->overlays = dispc_overlays;
+}
+
+#ifdef L4_EXAMPLE
+static struct omap_overlay *l4_overlays[1];
+void dss_overlay_setup_l4_manager(struct omap_overlay_manager *mgr)
+{
+	mgr->num_overlays = 1;
+	mgr->overlays = l4_overlays;
+}
+#endif
+
+void dss_init_overlays(struct platform_device *pdev)
+{
+	int i, r;
+
+	INIT_LIST_HEAD(&overlay_list);
+
+	num_overlays = 0;
+
+	for (i = 0; i < 3; ++i) {
+		struct omap_overlay *ovl;
+		ovl = kzalloc(sizeof(*ovl), GFP_KERNEL);
+
+		BUG_ON(ovl == NULL);
+
+		switch (i) {
+		case 0:
+			ovl->name = "gfx";
+			ovl->id = OMAP_DSS_GFX;
+			ovl->supported_modes = cpu_is_omap34xx() ?
+				OMAP_DSS_COLOR_GFX_OMAP3 :
+				OMAP_DSS_COLOR_GFX_OMAP2;
+			ovl->caps = OMAP_DSS_OVL_CAP_DISPC;
+			ovl->info.global_alpha = 255;
+			break;
+		case 1:
+			ovl->name = "vid1";
+			ovl->id = OMAP_DSS_VIDEO1;
+			ovl->supported_modes = cpu_is_omap34xx() ?
+				OMAP_DSS_COLOR_VID1_OMAP3 :
+				OMAP_DSS_COLOR_VID_OMAP2;
+			ovl->caps = OMAP_DSS_OVL_CAP_SCALE |
+				OMAP_DSS_OVL_CAP_DISPC;
+			ovl->info.global_alpha = 255;
+			break;
+		case 2:
+			ovl->name = "vid2";
+			ovl->id = OMAP_DSS_VIDEO2;
+			ovl->supported_modes = cpu_is_omap34xx() ?
+				OMAP_DSS_COLOR_VID2_OMAP3 :
+				OMAP_DSS_COLOR_VID_OMAP2;
+			ovl->caps = OMAP_DSS_OVL_CAP_SCALE |
+				OMAP_DSS_OVL_CAP_DISPC;
+			ovl->info.global_alpha = 255;
+			break;
+		}
+
+		ovl->set_manager = &omap_dss_set_manager;
+		ovl->unset_manager = &omap_dss_unset_manager;
+		ovl->set_overlay_info = &dss_ovl_set_overlay_info;
+		ovl->get_overlay_info = &dss_ovl_get_overlay_info;
+		ovl->wait_for_go = &dss_ovl_wait_for_go;
+
+		omap_dss_add_overlay(ovl);
+
+		r = kobject_init_and_add(&ovl->kobj, &overlay_ktype,
+				&pdev->dev.kobj, "overlay%d", i);
+
+		if (r) {
+			DSSERR("failed to create sysfs file\n");
+			continue;
+		}
+
+		dispc_overlays[i] = ovl;
+	}
+
+#ifdef L4_EXAMPLE
+	{
+		struct omap_overlay *ovl;
+		ovl = kzalloc(sizeof(*ovl), GFP_KERNEL);
+
+		BUG_ON(ovl == NULL);
+
+		ovl->name = "l4";
+		ovl->supported_modes = OMAP_DSS_COLOR_RGB24U;
+
+		ovl->set_manager = &omap_dss_set_manager;
+		ovl->unset_manager = &omap_dss_unset_manager;
+		ovl->set_overlay_info = &dss_ovl_set_overlay_info;
+		ovl->get_overlay_info = &dss_ovl_get_overlay_info;
+
+		omap_dss_add_overlay(ovl);
+
+		r = kobject_init_and_add(&ovl->kobj, &overlay_ktype,
+				&pdev->dev.kobj, "overlayl4");
+
+		if (r)
+			DSSERR("failed to create sysfs file\n");
+
+		l4_overlays[0] = ovl;
+	}
+#endif
+}
+
+/* connect overlays to the new device, if not already connected. if force
+ * selected, connect always. */
+void dss_recheck_connections(struct omap_dss_device *dssdev, bool force)
+{
+	int i;
+	struct omap_overlay_manager *lcd_mgr;
+	struct omap_overlay_manager *tv_mgr;
+	struct omap_overlay_manager *mgr = NULL;
+
+	lcd_mgr = omap_dss_get_overlay_manager(OMAP_DSS_OVL_MGR_LCD);
+	tv_mgr = omap_dss_get_overlay_manager(OMAP_DSS_OVL_MGR_TV);
+
+	if (dssdev->type != OMAP_DISPLAY_TYPE_VENC) {
+		if (!lcd_mgr->device || force) {
+			if (lcd_mgr->device)
+				lcd_mgr->unset_device(lcd_mgr);
+			lcd_mgr->set_device(lcd_mgr, dssdev);
+			mgr = lcd_mgr;
+		}
+	}
+
+	if (dssdev->type == OMAP_DISPLAY_TYPE_VENC) {
+		if (!tv_mgr->device || force) {
+			if (tv_mgr->device)
+				tv_mgr->unset_device(tv_mgr);
+			tv_mgr->set_device(tv_mgr, dssdev);
+			mgr = tv_mgr;
+		}
+	}
+
+	if (mgr) {
+		for (i = 0; i < 3; i++) {
+			struct omap_overlay *ovl;
+			ovl = omap_dss_get_overlay(i);
+			if (!ovl->manager || force) {
+				if (ovl->manager)
+					omap_dss_unset_manager(ovl);
+				omap_dss_set_manager(ovl, mgr);
+			}
+		}
+	}
+}
+
+void dss_uninit_overlays(struct platform_device *pdev)
+{
+	struct omap_overlay *ovl;
+
+	while (!list_empty(&overlay_list)) {
+		ovl = list_first_entry(&overlay_list,
+				struct omap_overlay, list);
+		list_del(&ovl->list);
+		kobject_del(&ovl->kobj);
+		kobject_put(&ovl->kobj);
+		kfree(ovl);
+	}
+
+	num_overlays = 0;
+}
+