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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 

 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

static LIST_HEAD(kernel_fb_helper_list);

/**

 * DOC: fbdev helpers

 *

 * The fb helper functions are useful to provide an fbdev on top of a drm kernel

 * mode setting driver. They can be used mostly independantely from the crtc

 * helper functions used by many drivers to implement the kernel mode setting

 * interfaces.

 *

 * Initialization is done as a three-step process with drm_fb_helper_init(),

 * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config().

 * Drivers with fancier requirements than the default beheviour can override the

 * second step with their own code.  Teardown is done with drm_fb_helper_fini().

 *

 * At runtime drivers should restore the fbdev console by calling

 * drm_fb_helper_restore_fbdev_mode() from their ->lastclose callback. They

 * should also notify the fb helper code from updates to the output

 * configuration by calling drm_fb_helper_hotplug_event(). For easier

 * integration with the output polling code in drm_crtc_helper.c the modeset

 * code proves a ->output_poll_changed callback.

 *

 * All other functions exported by the fb helper library can be used to

 * implement the fbdev driver interface by the driver.

 */

/**

 * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev

 * 					       emulation helper

 * @fb_helper: fbdev initialized with drm_fb_helper_init

 *

 * This functions adds all the available connectors for use with the given

 * fb_helper. This is a separate step to allow drivers to freely assign

 * connectors to the fbdev, e.g. if some are reserved for special purposes or

 * not adequate to be used for the fbcon.

 *

 * Since this is part of the initial setup before the fbdev is published, no

 * locking is required.

 */

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;

	if (helper->funcs->gamma_get == NULL)

		return;

	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;

	if (crtc->funcs->gamma_set == NULL)

		return;

	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 bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper)

{

	struct drm_device *dev = fb_helper->dev;

	struct drm_crtc *crtc;

	int bound = 0, crtcs_bound = 0;

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

		if (crtc->fb)

			crtcs_bound++;

		if (crtc->fb == fb_helper->fb)

			bound++;

	}

	if (bound < crtcs_bound)

		return false;

	return true;

}

#ifdef CONFIG_MAGIC_SYSRQ

static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)

{

	bool ret;

	ret = drm_fb_helper_force_kernel_mode();

	if (ret == true)

		DRM_ERROR("Failed to restore crtc configuration\n");

}

static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);

static void drm_fb_helper_sysrq(int dummy1)

{

	schedule_work(&drm_fb_helper_restore_work);

}

static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {

	.handler = drm_fb_helper_sysrq,

	.help_msg = "force-fb(V)",

	.action_msg = "Restore framebuffer console",

};

#else

#endif

static void drm_fb_helper_dpms(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_connector *connector;

	int i, j;

	/*

	 * fbdev->blank can be called from irq context in case of a panic.

	 * Since we already have our own special panic handler which will

	 * restore the fbdev console mode completely, just bail out early.

	 */

	/*

	 * For each CRTC in this fb, turn the connectors on/off.

	 */

	drm_modeset_lock_all(dev);

	if (!drm_fb_helper_is_bound(fb_helper)) {

		drm_modeset_unlock_all(dev);

		return;

	}

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

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

		if (!crtc->enabled)

				continue;

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

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

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

			connector->funcs->dpms(connector, dpms_mode);

			drm_object_property_set_value(&connector->base,

				dev->mode_config.dpms_property, dpms_mode);

		}

	}

	drm_modeset_unlock_all(dev);

}

/**

 * drm_fb_helper_blank - implementation for ->fb_blank

 * @blank: desired blanking state

 * @info: fbdev registered by the helper

 */

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_dpms(info, DRM_MODE_DPMS_ON);

		break;

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

	case FB_BLANK_NORMAL:

		drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);

		break;

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

	case FB_BLANK_HSYNC_SUSPEND:

		drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY);

		break;

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

	case FB_BLANK_VSYNC_SUSPEND:

		drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND);

		break;

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

	case FB_BLANK_POWERDOWN:

		drm_fb_helper_dpms(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);

		if (helper->crtc_info[i].mode_set.mode)

			drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode);

	}

	kfree(helper->crtc_info);

}

/**

 * drm_fb_helper_init - initialize a drm_fb_helper structure

 * @dev: drm device

 * @fb_helper: driver-allocated fbdev helper structure to initialize

 * @crtc_count: maximum number of crtcs to support in this fbdev emulation

 * @max_conn_count: max connector count

 *

 * This allocates the structures for the fbdev helper with the given limits.

 * Note that this won't yet touch the hardware (through the driver interfaces)

 * nor register the fbdev. This is only done in drm_fb_helper_initial_config()

 * to allow driver writes more control over the exact init sequence.

 *

 * Drivers must set fb_helper->funcs before calling

 * drm_fb_helper_initial_config().

 *

 * RETURNS:

 * Zero if everything went ok, nonzero otherwise.

 */

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 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)

			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].mode_set.crtc = crtc;

		i++;

	}

	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;

	}

	/*

	 * The driver really shouldn't advertise pseudo/directcolor

	 * visuals if it can't deal with the palette.

	 */

	if (WARN_ON(!fb_helper->funcs->gamma_set ||

		    !fb_helper->funcs->gamma_get))

		return -EINVAL;

	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;

}

/**

 * drm_fb_helper_setcmap - implementation for ->fb_setcmap

 * @cmap: cmap to set

 * @info: fbdev registered by the helper

 */

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

{

	struct drm_fb_helper *fb_helper = info->par;

	struct drm_device *dev = fb_helper->dev;

	struct drm_crtc_helper_funcs *crtc_funcs;

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

	struct drm_crtc *crtc;

	int i, j, rc = 0;

	int start;

	drm_modeset_lock_all(dev);

	if (!drm_fb_helper_is_bound(fb_helper)) {

		drm_modeset_unlock_all(dev);

		return -EBUSY;

	}

		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)

				goto out;

		}

		if (crtc_funcs->load_lut)

		crtc_funcs->load_lut(crtc);

	}

 out:

	drm_modeset_unlock_all(dev);

	return rc;

}

EXPORT_SYMBOL(drm_fb_helper_setcmap);

/**

 * drm_fb_helper_check_var - implementation for ->fb_check_var

 * @var: screeninfo to check

 * @info: fbdev registered by the helper

 */

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 ||

	    var->xres_virtual > fb->width || var->yres_virtual > fb->height) {

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

			  "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",

			  var->xres, var->yres, var->bits_per_pixel,

			  var->xres_virtual, var->yres_virtual,

			  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);

/**

 * drm_fb_helper_set_par - implementation for ->fb_set_par

 * @info: fbdev registered by the helper

 *

 * This will let fbcon do the mode init and is called at initialization time by

 * the fbdev core when registering the driver, and later on through the hotplug

 * callback.

 */

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;

	int ret;

	int i;

	if (var->pixclock != 0) {

		DRM_ERROR("PIXEL CLOCK SET\n");

		return -EINVAL;

	}

	drm_modeset_lock_all(dev);

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

		ret = drm_mode_set_config_internal(&fb_helper->crtc_info[i].mode_set);

		if (ret) {

			drm_modeset_unlock_all(dev);

				return ret;

		}

	}

	drm_modeset_unlock_all(dev);

	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);

/**

 * drm_fb_helper_pan_display - implementation for ->fb_pan_display

 * @var: updated screen information

 * @info: fbdev registered by the helper

 */

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;

	int ret = 0;

	int i;

	drm_modeset_lock_all(dev);

	if (!drm_fb_helper_is_bound(fb_helper)) {

		drm_modeset_unlock_all(dev);

		return -EBUSY;

	}

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

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

		modeset->x = var->xoffset;

		modeset->y = var->yoffset;

		if (modeset->num_connectors) {

			ret = drm_mode_set_config_internal(modeset);

			if (!ret) {

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

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

			}

		}

	}

	drm_modeset_unlock_all(dev);

	return ret;

}

EXPORT_SYMBOL(drm_fb_helper_pan_display);

/*

 * Allocates the backing storage and sets up the fbdev info structure through

 * the ->fb_probe callback and then registers the fbdev and sets up the panic

 * notifier.

 */

static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,

				  int preferred_bpp)

{

	int ret = 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;

	/* if driver picks 8 or 16 by default use that

	   for both depth/bpp */

	if (preferred_bpp != sizes.surface_bpp)

		sizes.surface_depth = sizes.surface_bpp = preferred_bpp;

	/* first up get a count of crtcs now in use and new min/maxes width/heights */

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

		struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];

		struct drm_cmdline_mode *cmdline_mode;

		cmdline_mode = &fb_helper_conn->cmdline_mode;

		if (cmdline_mode->bpp_specified) {

			switch (cmdline_mode->bpp) {

			case 8:

				sizes.surface_depth = sizes.surface_bpp = 8;

				break;

			case 15:

				sizes.surface_depth = 15;

				sizes.surface_bpp = 16;

				break;

			case 16:

				sizes.surface_depth = sizes.surface_bpp = 16;

				break;

			case 24:

				sizes.surface_depth = sizes.surface_bpp = 24;

				break;

			case 32:

    sizes.surface_depth = 24;

    sizes.surface_bpp = 32;

				break;

			}

			break;

		}

	}

	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 */

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

	if (ret < 0)

		return ret;

	info = fb_helper->fbdev;

	/*

	 * Set the fb pointer - usually drm_setup_crtcs does this for hotplug

	 * events, but at init time drm_setup_crtcs needs to be called before

	 * the fb is allocated (since we need to figure out the desired size of

	 * the fb before we can allocate it ...). Hence we need to fix things up

	 * here again.

	 */

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

		if (fb_helper->crtc_info[i].mode_set.num_connectors)

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

		info->var.pixclock = 0;

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

	return 0;

}

/**

 * drm_fb_helper_fill_fix - initializes fixed fbdev information

 * @info: fbdev registered by the helper

 * @pitch: desired pitch

 * @depth: desired depth

 *

 * Helper to fill in the fixed fbdev information useful for a non-accelerated

 * fbdev emulations. Drivers which support acceleration methods which impose

 * additional constraints need to set up their own limits.

 *

 * Drivers should call this (or their equivalent setup code) from their

 * ->fb_probe callback.

 */

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);

/**

 * drm_fb_helper_fill_var - initalizes variable fbdev information

 * @info: fbdev instance to set up

 * @fb_helper: fb helper instance to use as template

 * @fb_width: desired fb width

 * @fb_height: desired fb height

 *

 * Sets up the variable fbdev metainformation from the given fb helper instance

 * and the drm framebuffer allocated in fb_helper->fb.

 *

 * Drivers should call this (or their equivalent setup code) from their

 * ->fb_probe callback after having allocated the fbdev backing

 * storage framebuffer.

 */

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 struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,

						      int width, int height)

{

	struct drm_cmdline_mode *cmdline_mode;

	struct drm_display_mode *mode = NULL;

	return NULL;

	cmdline_mode = &fb_helper_conn->cmdline_mode;

	if (cmdline_mode->specified == false)

		return mode;

	/* attempt to find a matching mode in the list of modes

	 *  we have gotten so far, if not add a CVT mode that conforms

	 */

	if (cmdline_mode->rb || cmdline_mode->margins)

		goto create_mode;

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

		/* check width/height */

		if (mode->hdisplay != cmdline_mode->xres ||

		    mode->vdisplay != cmdline_mode->yres)

			continue;

		if (cmdline_mode->refresh_specified) {

			if (mode->vrefresh != cmdline_mode->refresh)

				continue;

		}

		if (cmdline_mode->interlace) {

			if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))

				continue;

		}

		return mode;

	}

create_mode:

	mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,

						 cmdline_mode);

	list_add(&mode->head, &fb_helper_conn->connector->modes);

	return mode;

}

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_cloned(struct drm_fb_helper *fb_helper,

			      struct drm_display_mode **modes,

			      bool *enabled, int width, int height)

{

	int count, i, j;

	bool can_clone = false;

	struct drm_fb_helper_connector *fb_helper_conn;

	struct drm_display_mode *dmt_mode, *mode;

	/* only contemplate cloning in the single crtc case */

	if (fb_helper->crtc_count > 1)

		return false;

	count = 0;

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

		if (enabled[i])

			count++;

	}

	/* only contemplate cloning if more than one connector is enabled */

	if (count <= 1)

		return false;

	/* check the command line or if nothing common pick 1024x768 */

	can_clone = true;

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

		if (!enabled[i])

			continue;

		fb_helper_conn = fb_helper->connector_info[i];

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

		if (!modes[i]) {

			can_clone = false;

			break;

		}

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

			if (!enabled[j])

				continue;

			if (!drm_mode_equal(modes[j], modes[i]))

				can_clone = false;

		}

	}

	if (can_clone) {

		DRM_DEBUG_KMS("can clone using command line\n");

		return true;

	}

	/* try and find a 1024x768 mode on each connector */

	can_clone = true;

	dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false);

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

		if (!enabled[i])

			continue;

		fb_helper_conn = fb_helper->connector_info[i];

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

			if (drm_mode_equal(mode, dmt_mode))

				modes[i] = mode;

		}

		if (!modes[i])

			can_clone = false;

	}

	if (can_clone) {

		DRM_DEBUG_KMS("can clone using 1024x768\n");

		return true;

	}

	DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");

	return 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);

		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,