/*
* Copyright © 1997-2003 by The XFree86 Project, Inc.
* Copyright © 2007 Dave Airlie
* Copyright © 2007-2008 Intel Corporation
* Jesse Barnes <jesse.barnes@intel.com>
* 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 <linux/list.h>
#include <linux/list_sort.h>
#include <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <video/of_videomode.h>
#include <video/videomode.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(const 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.elo.utfsm.cl/~elo212/docs/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) {