Importing sys/dev/videomode
NetBSD provides an in-kernel EDID parser, validator, and printer along with other useful functions. This code will be re-used by the Minix fb driver as it is a complete and well tested implementation. Change-Id: I46fe3005d9957cd90d4972030ddcce7bc3bd7924
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Thomas Cort
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Gerrit Code Review
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sys/dev/videomode/pickmode.c
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208
sys/dev/videomode/pickmode.c
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/* $NetBSD: pickmode.c,v 1.4 2011/04/09 20:53:39 christos Exp $ */
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/*-
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* Copyright (c) 2006 The NetBSD Foundation
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* All rights reserved.
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*
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* this code was contributed to The NetBSD Foundation by Michael Lorenz
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE NETBSD FOUNDATION BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: pickmode.c,v 1.4 2011/04/09 20:53:39 christos Exp $");
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#include <sys/param.h>
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#include <dev/videomode/videomode.h>
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#ifndef __minix
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#include "opt_videomode.h"
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#endif
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#ifndef abs
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#define abs(x) (((x) < 0) ? -(x) : (x))
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#endif
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#ifdef PICKMODE_DEBUG
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#define DPRINTF printf
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#else
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#define DPRINTF while (0) printf
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#endif
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const struct videomode *
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pick_mode_by_dotclock(int width, int height, int dotclock)
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{
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const struct videomode *this, *best = NULL;
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int i;
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DPRINTF("%s: looking for %d x %d at up to %d kHz\n", __func__, width,
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height, dotclock);
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for (i = 0; i < videomode_count; i++) {
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this = &videomode_list[i];
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if ((this->hdisplay != width) || (this->vdisplay != height) ||
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(this->dot_clock > dotclock))
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continue;
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if (best != NULL) {
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if (this->dot_clock > best->dot_clock)
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best = this;
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} else
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best = this;
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}
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if (best != NULL)
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DPRINTF("found %s\n", best->name);
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return best;
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}
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const struct videomode *
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pick_mode_by_ref(int width, int height, int refresh)
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{
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const struct videomode *this, *best = NULL;
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int mref, closest = 1000, i, diff;
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DPRINTF("%s: looking for %d x %d at up to %d Hz\n", __func__, width,
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height, refresh);
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for (i = 0; i < videomode_count; i++) {
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this = &videomode_list[i];
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mref = this->dot_clock * 1000 / (this->htotal * this->vtotal);
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diff = abs(mref - refresh);
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if ((this->hdisplay != width) || (this->vdisplay != height))
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continue;
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DPRINTF("%s in %d hz, diff %d\n", this->name, mref, diff);
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if (best != NULL) {
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if (diff < closest) {
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best = this;
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closest = diff;
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}
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} else {
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best = this;
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closest = diff;
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}
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}
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if (best != NULL)
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DPRINTF("found %s %d\n", best->name, best->dot_clock);
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return best;
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}
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static inline void
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swap_modes(struct videomode *left, struct videomode *right)
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{
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struct videomode temp;
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temp = *left;
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*left = *right;
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*right = temp;
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}
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/*
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* Sort modes by refresh rate, aspect ratio (*), then resolution.
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* Preferred mode or largest mode is first in the list and other modes
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* are sorted on closest match to that mode.
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* (*) Note that the aspect ratio calculation treats "close" aspect ratios
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* (within 12.5%) as the same for this purpose.
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*/
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#define DIVIDE(x, y) (((x) + ((y) / 2)) / (y))
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void
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sort_modes(struct videomode *modes, struct videomode **preferred, int nmodes)
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{
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int aspect, refresh, hbest, vbest, abest, atemp, rbest, rtemp;
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int i, j;
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struct videomode *mtemp = NULL;
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if (nmodes < 2)
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return;
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if (*preferred != NULL) {
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/* Put the preferred mode first in the list */
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aspect = (*preferred)->hdisplay * 100 / (*preferred)->vdisplay;
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refresh = DIVIDE(DIVIDE((*preferred)->dot_clock * 1000,
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(*preferred)->htotal), (*preferred)->vtotal);
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if (*preferred != modes) {
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swap_modes(*preferred, modes);
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*preferred = modes;
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}
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} else {
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/*
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* Find the largest horizontal and vertical mode and put that
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* first in the list. Preferred refresh rate is taken from
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* the first mode of this size.
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*/
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hbest = 0;
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vbest = 0;
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for (i = 0; i < nmodes; i++) {
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if (modes[i].hdisplay > hbest) {
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hbest = modes[i].hdisplay;
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vbest = modes[i].vdisplay;
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mtemp = &modes[i];
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} else if (modes[i].hdisplay == hbest &&
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modes[i].vdisplay > vbest) {
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vbest = modes[i].vdisplay;
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mtemp = &modes[i];
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}
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}
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aspect = mtemp->hdisplay * 100 / mtemp->vdisplay;
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refresh = DIVIDE(DIVIDE(mtemp->dot_clock * 1000,
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mtemp->htotal), mtemp->vtotal);
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if (mtemp != modes)
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swap_modes(mtemp, modes);
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}
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/* Sort other modes by refresh rate, aspect ratio, then resolution */
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for (j = 1; j < nmodes - 1; j++) {
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rbest = 1000;
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abest = 1000;
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hbest = 0;
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vbest = 0;
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for (i = j; i < nmodes; i++) {
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rtemp = abs(refresh -
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DIVIDE(DIVIDE(modes[i].dot_clock * 1000,
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modes[i].htotal), modes[i].vtotal));
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atemp = (modes[i].hdisplay * 100 / modes[i].vdisplay);
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if (rtemp < rbest) {
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rbest = rtemp;
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mtemp = &modes[i];
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}
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if (rtemp == rbest) {
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/* Treat "close" aspect ratios as identical */
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if (abs(abest - atemp) > (abest / 8) &&
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abs(aspect - atemp) < abs(aspect - abest)) {
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abest = atemp;
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mtemp = &modes[i];
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}
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if (atemp == abest ||
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abs(abest - atemp) <= (abest / 8)) {
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if (modes[i].hdisplay > hbest) {
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hbest = modes[i].hdisplay;
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mtemp = &modes[i];
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}
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if (modes[i].hdisplay == hbest &&
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modes[i].vdisplay > vbest) {
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vbest = modes[i].vdisplay;
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mtemp = &modes[i];
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}
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}
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}
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}
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if (mtemp != &modes[j])
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swap_modes(mtemp, &modes[j]);
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}
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}
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