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/* (c) 2006-2007 Intel Corporation
 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
 *
 * DRM core CRTC related functions
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 *
 * Authors:
 *      Keith Packard
 *	Eric Anholt <eric@anholt.net>
 *      Dave Airlie <airlied@linux.ie>
 *      Jesse Barnes <jesse.barnes@intel.com>
 */

#include "drmP.h"
#include "drm_crtc.h"
#include "drm_crtc_helper.h"

/*
 * Detailed mode info for a standard 640x480@60Hz monitor
 */
static struct drm_display_mode std_mode[] = {
	{ DRM_MODE("640x480", DRM_MODE_TYPE_DEFAULT, 25200, 640, 656,
		   752, 800, 0, 480, 490, 492, 525, 0,
		   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) }, /* 640x480@60Hz */
};

/**
 * drm_helper_probe_connector_modes - get complete set of display modes
 * @dev: DRM device
 * @maxX: max width for modes
 * @maxY: max height for modes
 *
 * LOCKING:
 * Caller must hold mode config lock.
 *
 * Based on @dev's mode_config layout, scan all the connectors and try to detect
 * modes on them.  Modes will first be added to the connector's probed_modes
 * list, then culled (based on validity and the @maxX, @maxY parameters) and
 * put into the normal modes list.
 *
 * Intended to be used either at bootup time or when major configuration
 * changes have occurred.
 *
 * FIXME: take into account monitor limits
 */
void drm_helper_probe_single_connector_modes(struct drm_connector *connector, uint32_t maxX, uint32_t maxY)
{
	struct drm_device *dev = connector->dev;
	struct drm_display_mode *mode, *t;
	struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
	int ret;

	DRM_DEBUG("%s\n", drm_get_connector_name(connector));
	/* set all modes to the unverified state */
	list_for_each_entry_safe(mode, t, &connector->modes, head)
		mode->status = MODE_UNVERIFIED;
		
	connector->status = (*connector->funcs->detect)(connector);
	
	if (connector->status == connector_status_disconnected) {
		DRM_DEBUG("%s is disconnected\n", drm_get_connector_name(connector));
		/* TODO set EDID to NULL */
		return;
	}
	
	ret = (*connector_funcs->get_modes)(connector);
	
	if (ret) {
		drm_mode_connector_list_update(connector);
	}
	
	if (maxX && maxY)
		drm_mode_validate_size(dev, &connector->modes, maxX,
				       maxY, 0);
	list_for_each_entry_safe(mode, t, &connector->modes, head) {
		if (mode->status == MODE_OK)
			mode->status = (*connector_funcs->mode_valid)(connector,mode);
	}
	
	
	drm_mode_prune_invalid(dev, &connector->modes, true);
	
	if (list_empty(&connector->modes)) {
		struct drm_display_mode *stdmode;
		
		DRM_DEBUG("No valid modes on %s\n", drm_get_connector_name(connector));
		
		/* Should we do this here ???
		 * When no valid EDID modes are available we end up
		 * here and bailed in the past, now we add a standard
		 * 640x480@60Hz mode and carry on.
		 */
		stdmode = drm_mode_duplicate(dev, &std_mode[0]);
		drm_mode_probed_add(connector, stdmode);
		drm_mode_list_concat(&connector->probed_modes,
				     &connector->modes);
		
		DRM_DEBUG("Adding standard 640x480 @ 60Hz to %s\n",
			  drm_get_connector_name(connector));
	}
	
	drm_mode_sort(&connector->modes);
	
	DRM_DEBUG("Probed modes for %s\n", drm_get_connector_name(connector));
	list_for_each_entry_safe(mode, t, &connector->modes, head) {
		mode->vrefresh = drm_mode_vrefresh(mode);
		
		drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
		drm_mode_debug_printmodeline(mode);
	}
}
EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);

void drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX, uint32_t maxY)
{
	struct drm_connector *connector;

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
		drm_helper_probe_single_connector_modes(connector, maxX, maxY);
	}
}
EXPORT_SYMBOL(drm_helper_probe_connector_modes);


/**
 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
 * @crtc: CRTC to check
 *
 * LOCKING:
 * Caller must hold mode config lock.
 *
 * Walk @crtc's DRM device's mode_config and see if it's in use.
 *
 * RETURNS:
 * True if @crtc is part of the mode_config, false otherwise.
 */
bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
{
	struct drm_encoder *encoder;
	struct drm_device *dev = crtc->dev;
	/* FIXME: Locking around list access? */
	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
		if (encoder->crtc == crtc)
			return true;
	return false;
}
EXPORT_SYMBOL(drm_helper_crtc_in_use);

/**
 * drm_disable_unused_functions - disable unused objects
 * @dev: DRM device
 *
 * LOCKING:
 * Caller must hold mode config lock.
 *
 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
 * by calling its dpms function, which should power it off.
 */
void drm_helper_disable_unused_functions(struct drm_device *dev)
{
	struct drm_encoder *encoder;
	struct drm_encoder_helper_funcs *encoder_funcs;
	struct drm_crtc *crtc;

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
		encoder_funcs = encoder->helper_private;
		if (!encoder->crtc)
			(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
	}

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
		struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
		crtc->enabled = drm_helper_crtc_in_use(crtc);
		if (!crtc->enabled) {
			crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
			crtc->fb = NULL;
		}
	}
}
EXPORT_SYMBOL(drm_helper_disable_unused_functions);

/**
 * drm_pick_crtcs - pick crtcs for connector devices
 * @dev: DRM device
 *
 * LOCKING:
 * Caller must hold mode config lock.
 */
void drm_pick_crtcs (struct drm_device *dev)
{
	int c, o, assigned;
	struct drm_connector *connector, *connector_equal;
	struct drm_encoder *encoder, *encoder_equal;
	struct drm_crtc   *crtc;
	struct drm_display_mode *des_mode = NULL, *modes, *modes_equal;
	struct drm_connector_helper_funcs *connector_funcs;
	int found;

	DRM_DEBUG("\n");
	/* clean out all the encoder/crtc combos */
	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
		encoder->crtc = NULL;
	}
	
	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
		connector_funcs = connector->helper_private;
		connector->encoder = NULL;

    		/* Don't hook up connectors that are disconnected ??
		 *
		 * This is debateable. Do we want fixed /dev/fbX or
		 * dynamic on hotplug (need mode code for that though) ?
		 *
		 * If we don't hook up connectors now, then we only create
		 * /dev/fbX for the connector that's enabled, that's good as
		 * the users console will be on that connector.
		 *
		 * If we do hook up connectors that are disconnected now, then
		 * the user may end up having to muck about with the fbcon
		 * map flags to assign his console to the enabled connector. Ugh.
		 */
    		if (connector->status != connector_status_connected)
			continue;

		if (list_empty(&connector->modes))
			continue;

		des_mode = NULL;
		found = 0;
		list_for_each_entry(des_mode, &connector->modes, head) {
			if (des_mode->type & DRM_MODE_TYPE_PREFERRED) {
				found = 1;
				break;
			}
		}

		/* No preferred mode, let's just select the first available */
		if (!found) {
			des_mode = NULL;
			list_for_each_entry(des_mode, &connector->modes, head) {
				break;
			}
		}

		encoder = connector_funcs->best_encoder(connector);
		if (!encoder)
			continue;

		connector->encoder = encoder;

		c = -1;
		list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
			assigned = 0;

			c++;
			if ((encoder->possible_crtcs & (1 << c)) == 0)
		    		continue;
	
			list_for_each_entry(encoder_equal, &dev->mode_config.encoder_list, head) {
				if (encoder->base.id == encoder_equal->base.id)
					continue;

				/* Find out if crtc has been assigned before */
				if (encoder_equal->crtc == crtc)
					assigned = 1;
			}

#if 1 /* continue for now */
			if (assigned)
				continue;
#endif

			o = -1;
			list_for_each_entry(connector_equal, &dev->mode_config.connector_list, head) {
				o++;
				if (connector->base.id == connector_equal->base.id)
					continue;

				encoder_equal = connector_equal->encoder;

				if (!encoder_equal)
					continue;

				list_for_each_entry(modes, &connector->modes, head) {
					list_for_each_entry(modes_equal, &connector_equal->modes, head) {
						if (drm_mode_equal (modes, modes_equal)) {