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/*

 * The list_sort function is (presumably) licensed under the GPL (see the

 * top level "COPYING" file for details).

 *

 * The remainder of this file is:

 *

 * Copyright © 1997-2003 by The XFree86 Project, Inc.

 * Copyright © 2007 Dave Airlie

 * Copyright © 2007-2008 Intel Corporation

 *   Jesse Barnes 

 * Copyright 2005-2006 Luc Verhaegen

 * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR

 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 * OTHER DEALINGS IN THE SOFTWARE.

 *

 * Except as contained in this notice, the name of the copyright holder(s)

 * and author(s) shall not be used in advertising or otherwise to promote

 * the sale, use or other dealings in this Software without prior written

 * authorization from the copyright holder(s) and author(s).

 */

#include 

#include "drmP.h"

#include "drm.h"

#include "drm_crtc.h"

/**

 * drm_mode_debug_printmodeline - debug print a mode

 * @dev: DRM device

 * @mode: mode to print

 *

 * LOCKING:

 * None.

 *

 * Describe @mode using DRM_DEBUG.

 */

void drm_mode_debug_printmodeline(struct drm_display_mode *mode)

{

	DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "

			"0x%x 0x%x\n",

		mode->base.id, mode->name, mode->vrefresh, mode->clock,

		mode->hdisplay, mode->hsync_start,

		mode->hsync_end, mode->htotal,

		mode->vdisplay, mode->vsync_start,

		mode->vsync_end, mode->vtotal, mode->type, mode->flags);

}

EXPORT_SYMBOL(drm_mode_debug_printmodeline);

/**

 * drm_cvt_mode -create a modeline based on CVT algorithm

 * @dev: DRM device

 * @hdisplay: hdisplay size

 * @vdisplay: vdisplay size

 * @vrefresh  : vrefresh rate

 * @reduced : Whether the GTF calculation is simplified

 * @interlaced:Whether the interlace is supported

 *

 * LOCKING:

 * none.

 *

 * return the modeline based on CVT algorithm

 *

 * This function is called to generate the modeline based on CVT algorithm

 * according to the hdisplay, vdisplay, vrefresh.

 * It is based from the VESA(TM) Coordinated Video Timing Generator by

 * Graham Loveridge April 9, 2003 available at

 * http://www.vesa.org/public/CVT/CVTd6r1.xls

 *

 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.

 * What I have done is to translate it by using integer calculation.

 */

#define HV_FACTOR			1000

struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,

				      int vdisplay, int vrefresh,

				      bool reduced, bool interlaced, bool margins)

{

	/* 1) top/bottom margin size (% of height) - default: 1.8, */

#define	CVT_MARGIN_PERCENTAGE		18

	/* 2) character cell horizontal granularity (pixels) - default 8 */

#define	CVT_H_GRANULARITY		8

	/* 3) Minimum vertical porch (lines) - default 3 */

#define	CVT_MIN_V_PORCH			3

	/* 4) Minimum number of vertical back porch lines - default 6 */

#define	CVT_MIN_V_BPORCH		6

	/* Pixel Clock step (kHz) */

#define CVT_CLOCK_STEP			250

	struct drm_display_mode *drm_mode;

	unsigned int vfieldrate, hperiod;

	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;

	int interlace;

	/* allocate the drm_display_mode structure. If failure, we will

	 * return directly

	 */

	drm_mode = drm_mode_create(dev);

	if (!drm_mode)

		return NULL;

	/* the CVT default refresh rate is 60Hz */

	if (!vrefresh)

		vrefresh = 60;

	/* the required field fresh rate */

	if (interlaced)

		vfieldrate = vrefresh * 2;

	else

		vfieldrate = vrefresh;

	/* horizontal pixels */

	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);

	/* determine the left&right borders */

	hmargin = 0;

	if (margins) {

		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;

		hmargin -= hmargin % CVT_H_GRANULARITY;

	}

	/* find the total active pixels */

	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;

	/* find the number of lines per field */

	if (interlaced)

		vdisplay_rnd = vdisplay / 2;

	else

		vdisplay_rnd = vdisplay;

	/* find the top & bottom borders */

	vmargin = 0;

	if (margins)

		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;

	drm_mode->vdisplay = vdisplay + 2 * vmargin;

	/* Interlaced */

	if (interlaced)

		interlace = 1;

	else

		interlace = 0;

	/* Determine VSync Width from aspect ratio */

	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))

		vsync = 4;

	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))

		vsync = 5;

	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))

		vsync = 6;

	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))

		vsync = 7;

	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))

		vsync = 7;

	else /* custom */

		vsync = 10;

	if (!reduced) {

		/* simplify the GTF calculation */

		/* 4) Minimum time of vertical sync + back porch interval (µs)

		 * default 550.0

		 */

		int tmp1, tmp2;

#define CVT_MIN_VSYNC_BP	550

		/* 3) Nominal HSync width (% of line period) - default 8 */

#define CVT_HSYNC_PERCENTAGE	8

		unsigned int hblank_percentage;

		int vsyncandback_porch, vback_porch, hblank;

		/* estimated the horizontal period */

		tmp1 = HV_FACTOR * 1000000  -

				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;

		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +

				interlace;

		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);

		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;

		/* 9. Find number of lines in sync + backporch */

		if (tmp1 < (vsync + CVT_MIN_V_PORCH))

			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;

		else

			vsyncandback_porch = tmp1;

		/* 10. Find number of lines in back porch */

		vback_porch = vsyncandback_porch - vsync;

		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +

				vsyncandback_porch + CVT_MIN_V_PORCH;

		/* 5) Definition of Horizontal blanking time limitation */

		/* Gradient (%/kHz) - default 600 */

#define CVT_M_FACTOR	600

		/* Offset (%) - default 40 */

#define CVT_C_FACTOR	40

		/* Blanking time scaling factor - default 128 */

#define CVT_K_FACTOR	128

		/* Scaling factor weighting - default 20 */

#define CVT_J_FACTOR	20

#define CVT_M_PRIME	(CVT_M_FACTOR * CVT_K_FACTOR / 256)

#define CVT_C_PRIME	((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \

			 CVT_J_FACTOR)

		/* 12. Find ideal blanking duty cycle from formula */

		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *

					hperiod / 1000;

		/* 13. Blanking time */

		if (hblank_percentage < 20 * HV_FACTOR)

			hblank_percentage = 20 * HV_FACTOR;

		hblank = drm_mode->hdisplay * hblank_percentage /

			 (100 * HV_FACTOR - hblank_percentage);

		hblank -= hblank % (2 * CVT_H_GRANULARITY);

		/* 14. find the total pixes per line */

		drm_mode->htotal = drm_mode->hdisplay + hblank;

		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;

		drm_mode->hsync_start = drm_mode->hsync_end -

			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;

		drm_mode->hsync_start += CVT_H_GRANULARITY -

			drm_mode->hsync_start % CVT_H_GRANULARITY;

		/* fill the Vsync values */

		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;

		drm_mode->vsync_end = drm_mode->vsync_start + vsync;

	} else {

		/* Reduced blanking */

		/* Minimum vertical blanking interval time (µs)- default 460 */

#define CVT_RB_MIN_VBLANK	460

		/* Fixed number of clocks for horizontal sync */

#define CVT_RB_H_SYNC		32

		/* Fixed number of clocks for horizontal blanking */

#define CVT_RB_H_BLANK		160

		/* Fixed number of lines for vertical front porch - default 3*/

#define CVT_RB_VFPORCH		3

		int vbilines;

		int tmp1, tmp2;

		/* 8. Estimate Horizontal period. */

		tmp1 = HV_FACTOR * 1000000 -

			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;

		tmp2 = vdisplay_rnd + 2 * vmargin;

		hperiod = tmp1 / (tmp2 * vfieldrate);

		/* 9. Find number of lines in vertical blanking */

		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;

		/* 10. Check if vertical blanking is sufficient */

		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))

			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;

		/* 11. Find total number of lines in vertical field */

		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;

		/* 12. Find total number of pixels in a line */

		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;

		/* Fill in HSync values */

		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;

		drm_mode->hsync_start = drm_mode->hsync_end = CVT_RB_H_SYNC;

	}

	/* 15/13. Find pixel clock frequency (kHz for xf86) */

	drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;

	drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;

	/* 18/16. Find actual vertical frame frequency */

	/* ignore - just set the mode flag for interlaced */

	if (interlaced)

		drm_mode->vtotal *= 2;

	/* Fill the mode line name */

	drm_mode_set_name(drm_mode);

	if (reduced)

		drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |

					DRM_MODE_FLAG_NVSYNC);

	else

		drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |

					DRM_MODE_FLAG_NHSYNC);

	if (interlaced)

		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;

    return drm_mode;

}

EXPORT_SYMBOL(drm_cvt_mode);

/**

 * drm_gtf_mode - create the modeline based on GTF algorithm

 *

 * @dev		:drm device

 * @hdisplay	:hdisplay size

 * @vdisplay	:vdisplay size

 * @vrefresh	:vrefresh rate.

 * @interlaced	:whether the interlace is supported

 * @margins	:whether the margin is supported

 *

 * LOCKING.

 * none.

 *

 * return the modeline based on GTF algorithm

 *

 * This function is to create the modeline based on the GTF algorithm.

 * Generalized Timing Formula is derived from:

 *	GTF Spreadsheet by Andy Morrish (1/5/97)

 *	available at http://www.vesa.org

 *

 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.

 * What I have done is to translate it by using integer calculation.

 * I also refer to the function of fb_get_mode in the file of

 * drivers/video/fbmon.c

 */

struct drm_display_mode *drm_gtf_mode(struct drm_device *dev, int hdisplay,

				      int vdisplay, int vrefresh,

				      bool interlaced, int margins)

{

	/* 1) top/bottom margin size (% of height) - default: 1.8, */

#define	GTF_MARGIN_PERCENTAGE		18

	/* 2) character cell horizontal granularity (pixels) - default 8 */

#define	GTF_CELL_GRAN			8

	/* 3) Minimum vertical porch (lines) - default 3 */

#define	GTF_MIN_V_PORCH			1

	/* width of vsync in lines */

#define V_SYNC_RQD			3

	/* width of hsync as % of total line */

#define H_SYNC_PERCENT			8

	/* min time of vsync + back porch (microsec) */

#define MIN_VSYNC_PLUS_BP		550

	/* blanking formula gradient */

#define GTF_M				600

	/* blanking formula offset */

#define GTF_C				40

	/* blanking formula scaling factor */

#define GTF_K				128

	/* blanking formula scaling factor */

#define GTF_J				20

	/* C' and M' are part of the Blanking Duty Cycle computation */

#define GTF_C_PRIME		(((GTF_C - GTF_J) * GTF_K / 256) + GTF_J)

#define GTF_M_PRIME		(GTF_K * GTF_M / 256)

	struct drm_display_mode *drm_mode;

	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;

	int top_margin, bottom_margin;

	int interlace;

	unsigned int hfreq_est;

	int vsync_plus_bp, vback_porch;

	unsigned int vtotal_lines, vfieldrate_est, hperiod;

	unsigned int vfield_rate, vframe_rate;

	int left_margin, right_margin;

	unsigned int total_active_pixels, ideal_duty_cycle;

	unsigned int hblank, total_pixels, pixel_freq;

	int hsync, hfront_porch, vodd_front_porch_lines;

	unsigned int tmp1, tmp2;

	drm_mode = drm_mode_create(dev);

	if (!drm_mode)

		return NULL;

	/* 1. In order to give correct results, the number of horizontal

	 * pixels requested is first processed to ensure that it is divisible

	 * by the character size, by rounding it to the nearest character

	 * cell boundary:

	 */

	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;

	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;

	/* 2. If interlace is requested, the number of vertical lines assumed

	 * by the calculation must be halved, as the computation calculates

	 * the number of vertical lines per field.

	 */

	if (interlaced)

		vdisplay_rnd = vdisplay / 2;

	else

		vdisplay_rnd = vdisplay;

	/* 3. Find the frame rate required: */

	if (interlaced)

		vfieldrate_rqd = vrefresh * 2;

	else

		vfieldrate_rqd = vrefresh;

	/* 4. Find number of lines in Top margin: */

	top_margin = 0;

	if (margins)

		top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /

				1000;

	/* 5. Find number of lines in bottom margin: */

	bottom_margin = top_margin;

	/* 6. If interlace is required, then set variable interlace: */

	if (interlaced)

		interlace = 1;

	else

		interlace = 0;

	/* 7. Estimate the Horizontal frequency */

	{

		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;

		tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *

				2 + interlace;

		hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;

	}

	/* 8. Find the number of lines in V sync + back porch */

	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */

	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;

	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;

	/*  9. Find the number of lines in V back porch alone: */

	vback_porch = vsync_plus_bp - V_SYNC_RQD;

	/*  10. Find the total number of lines in Vertical field period: */

	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +

			vsync_plus_bp + GTF_MIN_V_PORCH;

	/*  11. Estimate the Vertical field frequency: */

	vfieldrate_est = hfreq_est / vtotal_lines;

	/*  12. Find the actual horizontal period: */

	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);

	/*  13. Find the actual Vertical field frequency: */

	vfield_rate = hfreq_est / vtotal_lines;

	/*  14. Find the Vertical frame frequency: */

	if (interlaced)

		vframe_rate = vfield_rate / 2;

	else

		vframe_rate = vfield_rate;

	/*  15. Find number of pixels in left margin: */

	if (margins)

		left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /

				1000;

	else

		left_margin = 0;

	/* 16.Find number of pixels in right margin: */

	right_margin = left_margin;

	/* 17.Find total number of active pixels in image and left and right */

	total_active_pixels = hdisplay_rnd + left_margin + right_margin;

	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */

	ideal_duty_cycle = GTF_C_PRIME * 1000 -

				(GTF_M_PRIME * 1000000 / hfreq_est);

	/* 19.Find the number of pixels in the blanking time to the nearest

	 * double character cell: */

	hblank = total_active_pixels * ideal_duty_cycle /

			(100000 - ideal_duty_cycle);

	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);

	hblank = hblank * 2 * GTF_CELL_GRAN;

	/* 20.Find total number of pixels: */

	total_pixels = total_active_pixels + hblank;

	/* 21.Find pixel clock frequency: */

	pixel_freq = total_pixels * hfreq_est / 1000;

	/* Stage 1 computations are now complete; I should really pass

	 * the results to another function and do the Stage 2 computations,

	 * but I only need a few more values so I'll just append the

	 * computations here for now */

	/* 17. Find the number of pixels in the horizontal sync period: */

	hsync = H_SYNC_PERCENT * total_pixels / 100;

	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;

	hsync = hsync * GTF_CELL_GRAN;

	/* 18. Find the number of pixels in horizontal front porch period */

	hfront_porch = hblank / 2 - hsync;

	/*  36. Find the number of lines in the odd front porch period: */

	vodd_front_porch_lines = GTF_MIN_V_PORCH ;

	/* finally, pack the results in the mode struct */

	drm_mode->hdisplay = hdisplay_rnd;

	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;

	drm_mode->hsync_end = drm_mode->hsync_start + hsync;

	drm_mode->htotal = total_pixels;

	drm_mode->vdisplay = vdisplay_rnd;

	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;

	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;

	drm_mode->vtotal = vtotal_lines;

	drm_mode->clock = pixel_freq;

	drm_mode_set_name(drm_mode);

	drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;

	if (interlaced) {

		drm_mode->vtotal *= 2;

		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;

	}

	return drm_mode;

}

EXPORT_SYMBOL(drm_gtf_mode);

/**

 * drm_mode_set_name - set the name on a mode

 * @mode: name will be set in this mode

 *

 * LOCKING:

 * None.

 *

 * Set the name of @mode to a standard format.

 */

void drm_mode_set_name(struct drm_display_mode *mode)

{

	snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d", mode->hdisplay,

		 mode->vdisplay);

}

EXPORT_SYMBOL(drm_mode_set_name);

/**

 * drm_mode_list_concat - move modes from one list to another

 * @head: source list

 * @new: dst list

 *

 * LOCKING:

 * Caller must ensure both lists are locked.

 *

 * Move all the modes from @head to @new.

 */

void drm_mode_list_concat(struct list_head *head, struct list_head *new)

{

	struct list_head *entry, *tmp;

	list_for_each_safe(entry, tmp, head) {

		list_move_tail(entry, new);

	}

}

EXPORT_SYMBOL(drm_mode_list_concat);

/**

 * drm_mode_width - get the width of a mode

 * @mode: mode

 *

 * LOCKING:

 * None.

 *

 * Return @mode's width (hdisplay) value.

 *

 * FIXME: is this needed?

 *

 * RETURNS:

 * @mode->hdisplay

 */

int drm_mode_width(struct drm_display_mode *mode)

{

	return mode->hdisplay;

}

EXPORT_SYMBOL(drm_mode_width);

/**

 * drm_mode_height - get the height of a mode

 * @mode: mode

 *

 * LOCKING:

 * None.

 *

 * Return @mode's height (vdisplay) value.

 *

 * FIXME: is this needed?

 *

 * RETURNS:

 * @mode->vdisplay

 */

int drm_mode_height(struct drm_display_mode *mode)

{

	return mode->vdisplay;

}

EXPORT_SYMBOL(drm_mode_height);

/**

 * drm_mode_vrefresh - get the vrefresh of a mode

 * @mode: mode

 *

 * LOCKING:

 * None.

 *

 * Return @mode's vrefresh rate or calculate it if necessary.

 *

 * FIXME: why is this needed?  shouldn't vrefresh be set already?

 *

 * RETURNS:

 * Vertical refresh rate. It will be the result of actual value plus 0.5.

 * If it is 70.288, it will return 70Hz.

 * If it is 59.6, it will return 60Hz.

 */

int drm_mode_vrefresh(struct drm_display_mode *mode)

{

	int refresh = 0;

	unsigned int calc_val;

	if (mode->vrefresh > 0)

		refresh = mode->vrefresh;

	else if (mode->htotal > 0 && mode->vtotal > 0) {

		int vtotal;

		vtotal = mode->vtotal;

		/* work out vrefresh the value will be x1000 */

		calc_val = (mode->clock * 1000);

		calc_val /= mode->htotal;

		refresh = (calc_val + vtotal / 2) / vtotal;

		if (mode->flags & DRM_MODE_FLAG_INTERLACE)

			refresh *= 2;

		if (mode->flags & DRM_MODE_FLAG_DBLSCAN)

			refresh /= 2;

		if (mode->vscan > 1)

			refresh /= mode->vscan;

	}

	return refresh;

}

EXPORT_SYMBOL(drm_mode_vrefresh);

/**

 * drm_mode_set_crtcinfo - set CRTC modesetting parameters

 * @p: mode

 * @adjust_flags: unused? (FIXME)

 *

 * LOCKING:

 * None.

 *

 * Setup the CRTC modesetting parameters for @p, adjusting if necessary.

 */

void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)

{

	if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))

		return;

	p->crtc_hdisplay = p->hdisplay;

	p->crtc_hsync_start = p->hsync_start;

	p->crtc_hsync_end = p->hsync_end;

	p->crtc_htotal = p->htotal;

	p->crtc_hskew = p->hskew;

	p->crtc_vdisplay = p->vdisplay;

	p->crtc_vsync_start = p->vsync_start;

	p->crtc_vsync_end = p->vsync_end;

	p->crtc_vtotal = p->vtotal;

	if (p->flags & DRM_MODE_FLAG_INTERLACE) {

		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {

			p->crtc_vdisplay /= 2;

			p->crtc_vsync_start /= 2;

			p->crtc_vsync_end /= 2;

			p->crtc_vtotal /= 2;

		}

		p->crtc_vtotal |= 1;

	}

	if (p->flags & DRM_MODE_FLAG_DBLSCAN) {

		p->crtc_vdisplay *= 2;

		p->crtc_vsync_start *= 2;

		p->crtc_vsync_end *= 2;

		p->crtc_vtotal *= 2;

	}

	if (p->vscan > 1) {

		p->crtc_vdisplay *= p->vscan;

		p->crtc_vsync_start *= p->vscan;

		p->crtc_vsync_end *= p->vscan;

		p->crtc_vtotal *= p->vscan;

	}

	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);

	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);

	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);

	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);

	p->crtc_hadjusted = false;

	p->crtc_vadjusted = false;

}

EXPORT_SYMBOL(drm_mode_set_crtcinfo);

/**

 * drm_mode_duplicate - allocate and duplicate an existing mode

 * @m: mode to duplicate

 *

 * LOCKING:

 * None.

 *

 * Just allocate a new mode, copy the existing mode into it, and return

 * a pointer to it.  Used to create new instances of established modes.

 */

struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,

					    struct drm_display_mode *mode)

{

	struct drm_display_mode *nmode;

	int new_id;

	nmode = drm_mode_create(dev);

	if (!nmode)

		return NULL;

	new_id = nmode->base.id;

	*nmode = *mode;

	nmode->base.id = new_id;

	INIT_LIST_HEAD(&nmode->head);

	return nmode;

}

EXPORT_SYMBOL(drm_mode_duplicate);

/**

 * drm_mode_equal - test modes for equality

 * @mode1: first mode

 * @mode2: second mode

 *

 * LOCKING:

 * None.

 *

 * Check to see if @mode1 and @mode2 are equivalent.

 *

 * RETURNS:

 * True if the modes are equal, false otherwise.

 */

bool drm_mode_equal(struct drm_display_mode *mode1, struct drm_display_mode *mode2)

{

	/* do clock check convert to PICOS so fb modes get matched

	 * the same */

	if (mode1->clock && mode2->clock) {

		if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))

			return false;

	} else if (mode1->clock != mode2->clock)

		return false;

	if (mode1->hdisplay == mode2->hdisplay &&

	    mode1->hsync_start == mode2->hsync_start &&

	    mode1->hsync_end == mode2->hsync_end &&

	    mode1->htotal == mode2->htotal &&

	    mode1->hskew == mode2->hskew &&

	    mode1->vdisplay == mode2->vdisplay &&

	    mode1->vsync_start == mode2->vsync_start &&

	    mode1->vsync_end == mode2->vsync_end &&

	    mode1->vtotal == mode2->vtotal &&

	    mode1->vscan == mode2->vscan &&

	    mode1->flags == mode2->flags)

		return true;

	return false;

}

EXPORT_SYMBOL(drm_mode_equal);

/**

 * drm_mode_validate_size - make sure modes adhere to size constraints

 * @dev: DRM device

 * @mode_list: list of modes to check

 * @maxX: maximum width

 * @maxY: maximum height

 * @maxPitch: max pitch

 *

 * LOCKING:

 * Caller must hold a lock protecting @mode_list.

 *

 * The DRM device (@dev) has size and pitch limits.  Here we validate the

 * modes we probed for @dev against those limits and set their status as

 * necessary.

 */

void drm_mode_validate_size(struct drm_device *dev,

			    struct list_head *mode_list,

			    int maxX, int maxY, int maxPitch)

{

	struct drm_display_mode *mode;

	list_for_each_entry(mode, mode_list, head) {

		if (maxPitch > 0 && mode->hdisplay > maxPitch)

			mode->status = MODE_BAD_WIDTH;

		if (maxX > 0 && mode->hdisplay > maxX)

			mode->status = MODE_VIRTUAL_X;

		if (maxY > 0 && mode->vdisplay > maxY)

			mode->status = MODE_VIRTUAL_Y;

	}

}

EXPORT_SYMBOL(drm_mode_validate_size);

/**

 * drm_mode_validate_clocks - validate modes against clock limits

 * @dev: DRM device

 * @mode_list: list of modes to check

 * @min: minimum clock rate array

 * @max: maximum clock rate array

 * @n_ranges: number of clock ranges (size of arrays)

 *

 * LOCKING:

 * Caller must hold a lock protecting @mode_list.

 *

 * Some code may need to check a mode list against the clock limits of the

 * device in question.  This function walks the mode list, testing to make

 * sure each mode falls within a given range (defined by @min and @max

 * arrays) and sets @mode->status as needed.

 */

void drm_mode_validate_clocks(struct drm_device *dev,

			      struct list_head *mode_list,

			      int *min, int *max, int n_ranges)

{

	struct drm_display_mode *mode;

	int i;

	list_for_each_entry(mode, mode_list, head) {

		bool good = false;

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

			if (mode->clock >= min[i] && mode->clock <= max[i]) {

				good = true;

				break;

			}

		}

		if (!good)

			mode->status = MODE_CLOCK_RANGE;

	}

}

EXPORT_SYMBOL(drm_mode_validate_clocks);

/**

 * drm_mode_prune_invalid - remove invalid modes from mode list

 * @dev: DRM device

 * @mode_list: list of modes to check

 * @verbose: be verbose about it

 *

 * LOCKING:

 * Caller must hold a lock protecting @mode_list.

 *

 * Once mode list generation is complete, a caller can use this routine to

 * remove invalid modes from a mode list.  If any of the modes have a

 * status other than %MODE_OK, they are removed from @mode_list and freed.

 */

void drm_mode_prune_invalid(struct drm_device *dev,

			    struct list_head *mode_list, bool verbose)

{

	struct drm_display_mode *mode, *t;

	list_for_each_entry_safe(mode, t, mode_list, head) {

		if (mode->status != MODE_OK) {

			list_del(&mode->head);

			if (verbose) {

				drm_mode_debug_printmodeline(mode);

				DRM_DEBUG_KMS("Not using %s mode %d\n",

					mode->name, mode->status);

			}

			drm_mode_destroy(dev, mode);

		}

	}

}

EXPORT_SYMBOL(drm_mode_prune_invalid);

/**

 * drm_mode_compare - compare modes for favorability

 * @lh_a: list_head for first mode

 * @lh_b: list_head for second mode

 *

 * LOCKING:

 * None.

 *

 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating

 * which is better.

 *

 * RETURNS:

 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or

 * positive if @lh_b is better than @lh_a.

 */

static int drm_mode_compare(struct list_head *lh_a, struct list_head *lh_b)

{

	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);

	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);

	int diff;

	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -

		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);

	if (diff)

		return diff;

	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;

	if (diff)

		return diff;

	diff = b->clock - a->clock;

	return diff;

}

/* FIXME: what we don't have a list sort function? */

/* list sort from Mark J Roberts (mjr@znex.org) */

void list_sort(struct list_head *head,

	       int (*cmp)(struct list_head *a, struct list_head *b))

{

	struct list_head *p, *q, *e, *list, *tail, *oldhead;

	int insize, nmerges, psize, qsize, i;

	list = head->next;

	list_del(head);

	insize = 1;

	for (;;) {

		p = oldhead = list;

		list = tail = NULL;

		nmerges = 0;

		while (p) {

			nmerges++;

			q = p;

			psize = 0;

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

				psize++;

				q = q->next == oldhead ? NULL : q->next;

				if (!q)

					break;

			}

			qsize = insize;

			while (psize > 0 || (qsize > 0 && q)) {

				if (!psize) {

					e = q;

					q = q->next;

					qsize--;

					if (q == oldhead)

						q = NULL;

				} else if (!qsize || !q) {

					e = p;

					p = p->next;

					psize--;

					if (p == oldhead)

						p = NULL;

				} else if (cmp(p, q) <= 0) {

					e = p;

					p = p->next;

					psize--;

					if (p == oldhead)

						p = NULL;

				} else {

					e = q;

					q = q->next;

					qsize--;

					if (q == oldhead)

						q = NULL;

				}

				if (tail)

					tail->next = e;

				else

					list = e;

				e->prev = tail;

				tail = e;

			}

			p = q;

		}

		tail->next = list;

		list->prev = tail;

		if (nmerges <= 1)

			break;

		insize *= 2;

	}

	head->next = list;

	head->prev = list->prev;

	list->prev->next = head;

	list->prev = head;

}

/**

 * drm_mode_sort - sort mode list

 * @mode_list: list to sort

 *

 * LOCKING:

 * Caller must hold a lock protecting @mode_list.

 *

 * Sort @mode_list by favorability, putting good modes first.

 */

void drm_mode_sort(struct list_head *mode_list)

{

	list_sort(mode_list, drm_mode_compare);

}

EXPORT_SYMBOL(drm_mode_sort);

/**

 * drm_mode_connector_list_update - update the mode list for the connector

 * @connector: the connector to update

 *

 * LOCKING:

 * Caller must hold a lock protecting @mode_list.

 *

 * This moves the modes from the @connector probed_modes list

 * to the actual mode list. It compares the probed mode against the current

 * list and only adds different modes. All modes unverified after this point

 * will be removed by the prune invalid modes.

 */

void drm_mode_connector_list_update(struct drm_connector *connector)

{

	struct drm_display_mode *mode;

	struct drm_display_mode *pmode, *pt;

	int found_it;

	list_for_each_entry_safe(pmode, pt, &connector->probed_modes,

				 head) {

		found_it = 0;

		/* go through current modes checking for the new probed mode */

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

			if (drm_mode_equal(pmode, mode)) {

				found_it = 1;

				/* if equal delete the probed mode */

				mode->status = pmode->status;

				/* Merge type bits together */

				mode->type |= pmode->type;

				list_del(&pmode->head);

				drm_mode_destroy(connector->dev, pmode);

				break;

			}

		}

		if (!found_it) {

			list_move_tail(&pmode->head, &connector->modes);

		}

	}

}

EXPORT_SYMBOL(drm_mode_connector_list_update);