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/*

 * Copyright (c) 2006-2009 Red Hat Inc.

 * Copyright (c) 2006-2008 Intel Corporation

 * Copyright (c) 2007 Dave Airlie 

 *

 * DRM framebuffer helper 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:

 *      Dave Airlie 

 *      Jesse Barnes 

 */

#include 

#include 

#include 

#include 

#include "drmP.h"

#include "drm_crtc.h"

#include "drm_fb_helper.h"

#include "drm_crtc_helper.h"

MODULE_AUTHOR("David Airlie, Jesse Barnes");

MODULE_DESCRIPTION("DRM KMS helper");

MODULE_LICENSE("GPL and additional rights");

static LIST_HEAD(kernel_fb_helper_list);

/* simple single crtc case helper function */

int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)

{

	struct drm_device *dev = fb_helper->dev;

	struct drm_connector *connector;

	int i;

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {

		struct drm_fb_helper_connector *fb_helper_connector;

		fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);

		if (!fb_helper_connector)

			goto fail;

		fb_helper_connector->connector = connector;

		fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;

	}

	return 0;

fail:

	for (i = 0; i < fb_helper->connector_count; i++) {

		kfree(fb_helper->connector_info[i]);

		fb_helper->connector_info[i] = NULL;

	}

	fb_helper->connector_count = 0;

    return -ENOMEM;

}

EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);

static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)

{

	uint16_t *r_base, *g_base, *b_base;

	int i;

	r_base = crtc->gamma_store;

	g_base = r_base + crtc->gamma_size;

	b_base = g_base + crtc->gamma_size;

	for (i = 0; i < crtc->gamma_size; i++)

		helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);

}

static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)

{

	uint16_t *r_base, *g_base, *b_base;

	r_base = crtc->gamma_store;

	g_base = r_base + crtc->gamma_size;

	b_base = g_base + crtc->gamma_size;

	crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);

}

static void drm_fb_helper_on(struct fb_info *info)

{

	struct drm_fb_helper *fb_helper = info->par;

	struct drm_device *dev = fb_helper->dev;

	struct drm_crtc *crtc;

	struct drm_crtc_helper_funcs *crtc_funcs;

	struct drm_connector *connector;

	struct drm_encoder *encoder;

	int i, j;

	/*

	 * For each CRTC in this fb, turn the crtc on then,

	 * find all associated encoders and turn them on.

	 */

	mutex_lock(&dev->mode_config.mutex);

	for (i = 0; i < fb_helper->crtc_count; i++) {

		crtc = fb_helper->crtc_info[i].mode_set.crtc;

		crtc_funcs = crtc->helper_private;

		if (!crtc->enabled)

				continue;

			crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);

		/* Walk the connectors & encoders on this fb turning them on */

		for (j = 0; j < fb_helper->connector_count; j++) {

			connector = fb_helper->connector_info[j]->connector;

			connector->dpms = DRM_MODE_DPMS_ON;

			drm_connector_property_set_value(connector,

							 dev->mode_config.dpms_property,

							 DRM_MODE_DPMS_ON);

		}

			/* Found a CRTC on this fb, now find encoders */

			list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {

				if (encoder->crtc == crtc) {

					struct drm_encoder_helper_funcs *encoder_funcs;

					encoder_funcs = encoder->helper_private;

					encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);

			}

		}

	}

	mutex_unlock(&dev->mode_config.mutex);

}

static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)

{

	struct drm_fb_helper *fb_helper = info->par;

	struct drm_device *dev = fb_helper->dev;

	struct drm_crtc *crtc;

	struct drm_crtc_helper_funcs *crtc_funcs;

	struct drm_connector *connector;

	struct drm_encoder *encoder;

	int i, j;

	/*

	 * For each CRTC in this fb, find all associated encoders

	 * and turn them off, then turn off the CRTC.

	 */

	mutex_lock(&dev->mode_config.mutex);

	for (i = 0; i < fb_helper->crtc_count; i++) {

		crtc = fb_helper->crtc_info[i].mode_set.crtc;

		crtc_funcs = crtc->helper_private;

		if (!crtc->enabled)

				continue;

		/* Walk the connectors on this fb and mark them off */

		for (j = 0; j < fb_helper->connector_count; j++) {

			connector = fb_helper->connector_info[j]->connector;

			connector->dpms = dpms_mode;

			drm_connector_property_set_value(connector,

							 dev->mode_config.dpms_property,

							 dpms_mode);

		}

			/* Found a CRTC on this fb, now find encoders */

			list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {

				if (encoder->crtc == crtc) {

					struct drm_encoder_helper_funcs *encoder_funcs;

					encoder_funcs = encoder->helper_private;

					encoder_funcs->dpms(encoder, dpms_mode);

				}

			}

			    crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);

	}

				mutex_unlock(&dev->mode_config.mutex);

}

int drm_fb_helper_blank(int blank, struct fb_info *info)

{

	switch (blank) {

	/* Display: On; HSync: On, VSync: On */

	case FB_BLANK_UNBLANK:

		drm_fb_helper_on(info);

		break;

	/* Display: Off; HSync: On, VSync: On */

	case FB_BLANK_NORMAL:

		drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);

		break;

	/* Display: Off; HSync: Off, VSync: On */

	case FB_BLANK_HSYNC_SUSPEND:

		drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);

		break;

	/* Display: Off; HSync: On, VSync: Off */

	case FB_BLANK_VSYNC_SUSPEND:

		drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);

		break;

	/* Display: Off; HSync: Off, VSync: Off */

	case FB_BLANK_POWERDOWN:

		drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);

		break;

	}

	return 0;

}

EXPORT_SYMBOL(drm_fb_helper_blank);

static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)

{

	int i;

	for (i = 0; i < helper->connector_count; i++)

		kfree(helper->connector_info[i]);

	kfree(helper->connector_info);

	for (i = 0; i < helper->crtc_count; i++)

		kfree(helper->crtc_info[i].mode_set.connectors);

	kfree(helper->crtc_info);

}

int drm_fb_helper_init(struct drm_device *dev,

		       struct drm_fb_helper *fb_helper,

		       int crtc_count, int max_conn_count)

{

	struct drm_crtc *crtc;

	int ret = 0;

	int i;

	fb_helper->dev = dev;

	INIT_LIST_HEAD(&fb_helper->kernel_fb_list);

	fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);

	if (!fb_helper->crtc_info)

		return -ENOMEM;

	fb_helper->crtc_count = crtc_count;

	fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);

	if (!fb_helper->connector_info) {

		kfree(fb_helper->crtc_info);

		return -ENOMEM;

	}

	fb_helper->connector_count = 0;

	for (i = 0; i < crtc_count; i++) {

		fb_helper->crtc_info[i].mode_set.connectors =

			kcalloc(max_conn_count,

				sizeof(struct drm_connector *),

				GFP_KERNEL);

		if (!fb_helper->crtc_info[i].mode_set.connectors) {

			ret = -ENOMEM;

			goto out_free;

		}

		fb_helper->crtc_info[i].mode_set.num_connectors = 0;

	}

	i = 0;

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {

		fb_helper->crtc_info[i].crtc_id = crtc->base.id;

		fb_helper->crtc_info[i].mode_set.crtc = crtc;

		i++;

	}

	fb_helper->conn_limit = max_conn_count;

	return 0;

out_free:

	drm_fb_helper_crtc_free(fb_helper);

	return -ENOMEM;

}

EXPORT_SYMBOL(drm_fb_helper_init);

static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,

		     u16 blue, u16 regno, struct fb_info *info)

{

	struct drm_fb_helper *fb_helper = info->par;

	struct drm_framebuffer *fb = fb_helper->fb;

	int pindex;

	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {

		u32 *palette;

		u32 value;

		/* place color in psuedopalette */

		if (regno > 16)

			return -EINVAL;

		palette = (u32 *)info->pseudo_palette;

		red >>= (16 - info->var.red.length);

		green >>= (16 - info->var.green.length);

		blue >>= (16 - info->var.blue.length);

		value = (red << info->var.red.offset) |

			(green << info->var.green.offset) |

			(blue << info->var.blue.offset);

		if (info->var.transp.length > 0) {

			u32 mask = (1 << info->var.transp.length) - 1;

			mask <<= info->var.transp.offset;

			value |= mask;

		}

		palette[regno] = value;

		return 0;

	}

	pindex = regno;

	if (fb->bits_per_pixel == 16) {

		pindex = regno << 3;

		if (fb->depth == 16 && regno > 63)

			return -EINVAL;

		if (fb->depth == 15 && regno > 31)

			return -EINVAL;

		if (fb->depth == 16) {

			u16 r, g, b;

			int i;

			if (regno < 32) {

				for (i = 0; i < 8; i++)

					fb_helper->funcs->gamma_set(crtc, red,

						green, blue, pindex + i);

			}

			fb_helper->funcs->gamma_get(crtc, &r,

						    &g, &b,

						    pindex >> 1);

			for (i = 0; i < 4; i++)

				fb_helper->funcs->gamma_set(crtc, r,

							    green, b,

							    (pindex >> 1) + i);

		}

	}

	if (fb->depth != 16)

		fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);

	return 0;

}

int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)

{

	struct drm_fb_helper *fb_helper = info->par;

	struct drm_crtc_helper_funcs *crtc_funcs;

	u16 *red, *green, *blue, *transp;

	struct drm_crtc *crtc;

	int i, j, rc = 0;

	int start;

		for (i = 0; i < fb_helper->crtc_count; i++) {

		crtc = fb_helper->crtc_info[i].mode_set.crtc;

		crtc_funcs = crtc->helper_private;

		red = cmap->red;

		green = cmap->green;

		blue = cmap->blue;

		transp = cmap->transp;

		start = cmap->start;

		for (j = 0; j < cmap->len; j++) {

			u16 hred, hgreen, hblue, htransp = 0xffff;

			hred = *red++;

			hgreen = *green++;

			hblue = *blue++;

			if (transp)

				htransp = *transp++;

			rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);

			if (rc)

				return rc;

		}

		crtc_funcs->load_lut(crtc);

	}

	return rc;

}

EXPORT_SYMBOL(drm_fb_helper_setcmap);

int drm_fb_helper_check_var(struct fb_var_screeninfo *var,

			    struct fb_info *info)

{

	struct drm_fb_helper *fb_helper = info->par;

	struct drm_framebuffer *fb = fb_helper->fb;

	int depth;

	if (var->pixclock != 0 || in_dbg_master())

		return -EINVAL;

	/* Need to resize the fb object !!! */

	if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {

		DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "

			  "object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,

			  fb->width, fb->height, fb->bits_per_pixel);

		return -EINVAL;

	}

	switch (var->bits_per_pixel) {

	case 16:

		depth = (var->green.length == 6) ? 16 : 15;

		break;

	case 32:

		depth = (var->transp.length > 0) ? 32 : 24;

		break;

	default:

		depth = var->bits_per_pixel;

		break;

	}

	switch (depth) {

	case 8:

		var->red.offset = 0;

		var->green.offset = 0;

		var->blue.offset = 0;

		var->red.length = 8;

		var->green.length = 8;

		var->blue.length = 8;

		var->transp.length = 0;

		var->transp.offset = 0;

		break;

	case 15:

		var->red.offset = 10;

		var->green.offset = 5;

		var->blue.offset = 0;

		var->red.length = 5;

		var->green.length = 5;

		var->blue.length = 5;

		var->transp.length = 1;

		var->transp.offset = 15;

		break;

	case 16:

		var->red.offset = 11;

		var->green.offset = 5;

		var->blue.offset = 0;

		var->red.length = 5;

		var->green.length = 6;

		var->blue.length = 5;

		var->transp.length = 0;

		var->transp.offset = 0;

		break;

	case 24:

		var->red.offset = 16;

		var->green.offset = 8;

		var->blue.offset = 0;

		var->red.length = 8;

		var->green.length = 8;

		var->blue.length = 8;

		var->transp.length = 0;

		var->transp.offset = 0;

		break;

	case 32:

		var->red.offset = 16;

		var->green.offset = 8;

		var->blue.offset = 0;

		var->red.length = 8;

		var->green.length = 8;

		var->blue.length = 8;

		var->transp.length = 8;

		var->transp.offset = 24;

		break;

	default:

		return -EINVAL;

	}

	return 0;

}

EXPORT_SYMBOL(drm_fb_helper_check_var);

/* this will let fbcon do the mode init */

int drm_fb_helper_set_par(struct fb_info *info)

{

	struct drm_fb_helper *fb_helper = info->par;

	struct drm_device *dev = fb_helper->dev;

	struct fb_var_screeninfo *var = &info->var;

	struct drm_crtc *crtc;

	int ret;

	int i;

	if (var->pixclock != 0) {

		DRM_ERROR("PIXEL CLOCK SET\n");

		return -EINVAL;

	}

	mutex_lock(&dev->mode_config.mutex);

		for (i = 0; i < fb_helper->crtc_count; i++) {

		crtc = fb_helper->crtc_info[i].mode_set.crtc;

			ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);

		if (ret) {

			mutex_unlock(&dev->mode_config.mutex);

				return ret;

		}

	}

	mutex_unlock(&dev->mode_config.mutex);

	if (fb_helper->delayed_hotplug) {

		fb_helper->delayed_hotplug = false;

//       drm_fb_helper_hotplug_event(fb_helper);

	}

	return 0;

}

EXPORT_SYMBOL(drm_fb_helper_set_par);

int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,

			      struct fb_info *info)

{

	struct drm_fb_helper *fb_helper = info->par;

	struct drm_device *dev = fb_helper->dev;

	struct drm_mode_set *modeset;

	struct drm_crtc *crtc;

	int ret = 0;

	int i;

	mutex_lock(&dev->mode_config.mutex);

		for (i = 0; i < fb_helper->crtc_count; i++) {

		crtc = fb_helper->crtc_info[i].mode_set.crtc;

		modeset = &fb_helper->crtc_info[i].mode_set;

		modeset->x = var->xoffset;

		modeset->y = var->yoffset;

		if (modeset->num_connectors) {

			ret = crtc->funcs->set_config(modeset);

			if (!ret) {

				info->var.xoffset = var->xoffset;

				info->var.yoffset = var->yoffset;

			}

		}

	}

	mutex_unlock(&dev->mode_config.mutex);

	return ret;

}

EXPORT_SYMBOL(drm_fb_helper_pan_display);

int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,

				  int preferred_bpp)

{

	int new_fb = 0;

	int crtc_count = 0;

	int i;

	struct fb_info *info;

	struct drm_fb_helper_surface_size sizes;

	int gamma_size = 0;

	memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));

	sizes.surface_depth = 24;

	sizes.surface_bpp = 32;

	sizes.fb_width = (unsigned)-1;

	sizes.fb_height = (unsigned)-1;

    sizes.surface_depth = 24;

    sizes.surface_bpp = 32;

	crtc_count = 0;

	for (i = 0; i < fb_helper->crtc_count; i++) {

		struct drm_display_mode *desired_mode;

		desired_mode = fb_helper->crtc_info[i].desired_mode;

		if (desired_mode) {

			if (gamma_size == 0)

				gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;

			if (desired_mode->hdisplay < sizes.fb_width)

				sizes.fb_width = desired_mode->hdisplay;

			if (desired_mode->vdisplay < sizes.fb_height)

				sizes.fb_height = desired_mode->vdisplay;

			if (desired_mode->hdisplay > sizes.surface_width)

				sizes.surface_width = desired_mode->hdisplay;

			if (desired_mode->vdisplay > sizes.surface_height)

				sizes.surface_height = desired_mode->vdisplay;

			crtc_count++;

		}

	}

	if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {

		/* hmm everyone went away - assume VGA cable just fell out

		   and will come back later. */

		DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");

		sizes.fb_width = sizes.surface_width = 1024;

		sizes.fb_height = sizes.surface_height = 768;

	}

	/* push down into drivers */

    new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);

	if (new_fb < 0)

		return new_fb;

	info = fb_helper->fbdev;

	/* set the fb pointer */

	for (i = 0; i < fb_helper->crtc_count; i++) {

		fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;

		}

	if (new_fb) {

		info->var.pixclock = 0;

		printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,

		       info->fix.id);

	} else {

		drm_fb_helper_set_par(info);

	}

	if (new_fb)

        list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);

	return 0;

}

EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);

void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,

			    uint32_t depth)

{

	info->fix.type = FB_TYPE_PACKED_PIXELS;

	info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :

		FB_VISUAL_TRUECOLOR;

	info->fix.mmio_start = 0;

	info->fix.mmio_len = 0;

	info->fix.type_aux = 0;

	info->fix.xpanstep = 1; /* doing it in hw */

	info->fix.ypanstep = 1; /* doing it in hw */

	info->fix.ywrapstep = 0;

	info->fix.accel = FB_ACCEL_NONE;

	info->fix.type_aux = 0;

	info->fix.line_length = pitch;

	return;

}

EXPORT_SYMBOL(drm_fb_helper_fill_fix);

void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,

			    uint32_t fb_width, uint32_t fb_height)

{

	struct drm_framebuffer *fb = fb_helper->fb;

	info->pseudo_palette = fb_helper->pseudo_palette;

	info->var.xres_virtual = fb->width;

	info->var.yres_virtual = fb->height;

	info->var.bits_per_pixel = fb->bits_per_pixel;

	info->var.accel_flags = FB_ACCELF_TEXT;

	info->var.xoffset = 0;

	info->var.yoffset = 0;

	info->var.activate = FB_ACTIVATE_NOW;

	info->var.height = -1;

	info->var.width = -1;

	switch (fb->depth) {

	case 8:

		info->var.red.offset = 0;

		info->var.green.offset = 0;

		info->var.blue.offset = 0;

		info->var.red.length = 8; /* 8bit DAC */

		info->var.green.length = 8;

		info->var.blue.length = 8;

		info->var.transp.offset = 0;

		info->var.transp.length = 0;

		break;

	case 15:

		info->var.red.offset = 10;

		info->var.green.offset = 5;

		info->var.blue.offset = 0;

		info->var.red.length = 5;

		info->var.green.length = 5;

		info->var.blue.length = 5;

		info->var.transp.offset = 15;

		info->var.transp.length = 1;

		break;

	case 16:

		info->var.red.offset = 11;

		info->var.green.offset = 5;

		info->var.blue.offset = 0;

		info->var.red.length = 5;

		info->var.green.length = 6;

		info->var.blue.length = 5;

		info->var.transp.offset = 0;

		break;

	case 24:

		info->var.red.offset = 16;

		info->var.green.offset = 8;

		info->var.blue.offset = 0;

		info->var.red.length = 8;

		info->var.green.length = 8;

		info->var.blue.length = 8;

		info->var.transp.offset = 0;

		info->var.transp.length = 0;

		break;

	case 32:

		info->var.red.offset = 16;

		info->var.green.offset = 8;

		info->var.blue.offset = 0;

		info->var.red.length = 8;

		info->var.green.length = 8;

		info->var.blue.length = 8;

		info->var.transp.offset = 24;

		info->var.transp.length = 8;

		break;

	default:

		break;

	}

	info->var.xres = fb_width;

	info->var.yres = fb_height;

}

EXPORT_SYMBOL(drm_fb_helper_fill_var);

static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,

					       uint32_t maxX,

					       uint32_t maxY)

{

	struct drm_connector *connector;

	int count = 0;

	int i;

	for (i = 0; i < fb_helper->connector_count; i++) {

		connector = fb_helper->connector_info[i]->connector;

		count += connector->funcs->fill_modes(connector, maxX, maxY);

	}

	return count;

}

static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)

{

	struct drm_display_mode *mode;

	list_for_each_entry(mode, &fb_connector->connector->modes, head) {

		if (drm_mode_width(mode) > width ||

		    drm_mode_height(mode) > height)

			continue;

		if (mode->type & DRM_MODE_TYPE_PREFERRED)

			return mode;

	}

	return NULL;

}

static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)

{

	struct drm_cmdline_mode *cmdline_mode;

	cmdline_mode = &fb_connector->cmdline_mode;

	return cmdline_mode->specified;

}

static bool drm_connector_enabled(struct drm_connector *connector, bool strict)

{

	bool enable;

	if (strict) {

		enable = connector->status == connector_status_connected;

	} else {

		enable = connector->status != connector_status_disconnected;

	}

	return enable;

}

static void drm_enable_connectors(struct drm_fb_helper *fb_helper,

				  bool *enabled)

{

	bool any_enabled = false;

	struct drm_connector *connector;

	int i = 0;

	for (i = 0; i < fb_helper->connector_count; i++) {

		connector = fb_helper->connector_info[i]->connector;

		enabled[i] = drm_connector_enabled(connector, true);

		DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,

			  enabled[i] ? "yes" : "no");

		any_enabled |= enabled[i];

	}

	if (any_enabled)

		return;

	for (i = 0; i < fb_helper->connector_count; i++) {

		connector = fb_helper->connector_info[i]->connector;

		enabled[i] = drm_connector_enabled(connector, false);

	}

}

static bool drm_target_preferred(struct drm_fb_helper *fb_helper,

				 struct drm_display_mode **modes,

				 bool *enabled, int width, int height)

{

	struct drm_fb_helper_connector *fb_helper_conn;

	int i;

	for (i = 0; i < fb_helper->connector_count; i++) {

		fb_helper_conn = fb_helper->connector_info[i];

		if (enabled[i] == false)

			continue;

		DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",

			      fb_helper_conn->connector->base.id);

		/* got for command line mode first */

//       modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);

        modes[i] = NULL;

		if (!modes[i]) {

			DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",

				      fb_helper_conn->connector->base.id);

			modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);

		}

		/* No preferred modes, pick one off the list */

		if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {

			list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)

				break;

		}

		DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :

			  "none");

	}

	return true;

}

static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,

			  struct drm_fb_helper_crtc **best_crtcs,

			  struct drm_display_mode **modes,

			  int n, int width, int height)

{

	int c, o;

	struct drm_device *dev = fb_helper->dev;

	struct drm_connector *connector;

	struct drm_connector_helper_funcs *connector_funcs;

	struct drm_encoder *encoder;

	struct drm_fb_helper_crtc *best_crtc;

	int my_score, best_score, score;

	struct drm_fb_helper_crtc **crtcs, *crtc;

	struct drm_fb_helper_connector *fb_helper_conn;

	if (n == fb_helper->connector_count)

		return 0;

	fb_helper_conn = fb_helper->connector_info[n];

	connector = fb_helper_conn->connector;

	best_crtcs[n] = NULL;

	best_crtc = NULL;

	best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);

	if (modes[n] == NULL)

		return best_score;

	crtcs = kzalloc(dev->mode_config.num_connector *

			sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);

	if (!crtcs)

		return best_score;

	my_score = 1;

	if (connector->status == connector_status_connected)

		my_score++;

	if (drm_has_cmdline_mode(fb_helper_conn))

		my_score++;

	if (drm_has_preferred_mode(fb_helper_conn, width, height))

		my_score++;

	connector_funcs = connector->helper_private;

	encoder = connector_funcs->best_encoder(connector);

	if (!encoder)

		goto out;

	/* select a crtc for this connector and then attempt to configure

	   remaining connectors */

	for (c = 0; c < fb_helper->crtc_count; c++) {

		crtc = &fb_helper->crtc_info[c];

		if ((encoder->possible_crtcs & (1 << c)) == 0) {

			continue;

		}

		for (o = 0; o < n; o++)

			if (best_crtcs[o] == crtc)

				break;

		if (o < n) {

			/* ignore cloning unless only a single crtc */

			if (fb_helper->crtc_count > 1)

				continue;

			if (!drm_mode_equal(modes[o], modes[n]))

				continue;

		}

		crtcs[n] = crtc;

		memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));

		score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,

						  width, height);

		if (score > best_score) {

			best_crtc = crtc;

			best_score = score;

			memcpy(best_crtcs, crtcs,

			       dev->mode_config.num_connector *

			       sizeof(struct drm_fb_helper_crtc *));

		}

	}

out:

	kfree(crtcs);

	return best_score;

}

static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)

{

	struct drm_device *dev = fb_helper->dev;

	struct drm_fb_helper_crtc **crtcs;

	struct drm_display_mode **modes;

	struct drm_encoder *encoder;

	struct drm_mode_set *modeset;

	bool *enabled;

	int width, height;

	int i, ret;

	DRM_DEBUG_KMS("\n");

	width = dev->mode_config.max_width;

	height = dev->mode_config.max_height;

	/* clean out all the encoder/crtc combos */

   list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {

		encoder->crtc = NULL;

   }

	crtcs = kcalloc(dev->mode_config.num_connector,

			sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);

	modes = kcalloc(dev->mode_config.num_connector,

			sizeof(struct drm_display_mode *), GFP_KERNEL);

	enabled = kcalloc(dev->mode_config.num_connector,

			  sizeof(bool), GFP_KERNEL);

	drm_enable_connectors(fb_helper, enabled);

    //ret = drm_target_cloned(fb_helper, modes, enabled, width, height);

    ret = 0;

	if (!ret) {

		ret = drm_target_preferred(fb_helper, modes, enabled, width, height);

		if (!ret)

			DRM_ERROR("Unable to find initial modes\n");

	}

	DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);

	drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);

	/* need to set the modesets up here for use later */

	/* fill out the connector<->crtc mappings into the modesets */

	for (i = 0; i < fb_helper->crtc_count; i++) {

		modeset = &fb_helper->crtc_info[i].mode_set;

		modeset->num_connectors = 0;

	}

	for (i = 0; i < fb_helper->connector_count; i++) {

		struct drm_display_mode *mode = modes[i];

		struct drm_fb_helper_crtc *fb_crtc = crtcs[i];

		modeset = &fb_crtc->mode_set;

		if (mode && fb_crtc) {

			DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",

				      mode->name, fb_crtc->mode_set.crtc->base.id);

			fb_crtc->desired_mode = mode;

			if (modeset->mode)

				drm_mode_destroy(dev, modeset->mode);

			modeset->mode = drm_mode_duplicate(dev,

							   fb_crtc->desired_mode);

			modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;

		}

	}

	kfree(crtcs);

	kfree(modes);

	kfree(enabled);

}

/**

 * drm_helper_initial_config - setup a sane initial connector configuration

 * @dev: DRM device

 *

 * LOCKING:

 * Called at init time, must take mode config lock.

 *

 * Scan the CRTCs and connectors and try to put together an initial setup.

 * At the moment, this is a cloned configuration across all heads with

 * a new framebuffer object as the backing store.

 *

 * RETURNS:

 * Zero if everything went ok, nonzero otherwise.

 */

bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)

{

	struct drm_device *dev = fb_helper->dev;

	int count = 0;

	/* disable all the possible outputs/crtcs before entering KMS mode */

//   drm_helper_disable_unused_functions(fb_helper->dev);

//   drm_fb_helper_parse_command_line(fb_helper);

	count = drm_fb_helper_probe_connector_modes(fb_helper,

						    dev->mode_config.max_width,

						    dev->mode_config.max_height);

	/*

	 * we shouldn't end up with no modes here.

	 */

	if (count == 0) {

		printk(KERN_INFO "No connectors reported connected with modes\n");

	}

	drm_setup_crtcs(fb_helper);

	return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);

}

EXPORT_SYMBOL(drm_fb_helper_initial_config);