f13b792a3a
3335. Clean up compiler warnings in lib/font/bitmap (#3411, Matt Grossman). 3334. TGA fixes, add sync on green (#3410, Matt Grossman). 3333. Fix NULL pointer dereference in libXaw (#3406, Christopher Sekiya). 3332. Add Rage128 support (#3405, Rik Faith, funded by ATI). 3331. Add MTRR support for NetBSD and OpenBSD. Add new NetBSD aperture driver (#3404, Matthieu Herrb). 3330. Xterm patch #121 (#3402, Thomas Dickey). 3329. Rendition driver bugfixes and alpha related cleanups (#3400, Dejan Ilic, Marc Langenbach, Egbert Eich). 3328. Add void input device (#3392, Frederic Lepied). 3327. Changed the Xon serial option to be able to select xon/xoff for input, output or both. Add support for Graphire models. Change wacom init phase to use new Xoff option (#3391, Frederic Lepied). 3326. Change the SwapAxes option to SwapXY in elographics/microtouch driver to match an already existing option in the Dynapro driver. Add a Focus class capability to the elographics driver (#3395, Patrick Lecoanet). 3325. Update mouse rate handling (#3388, Harald Koenig). 3324. Fix NULL pointer dereference in misprite.c (#3380, Edward Wang). 3323. Add FBDev and ShadowFB support to glint driver. Add new option "NoWriteBitmap" (#3383, Michel Daenzer). 3322. Update SuperProbe to handle S3 Savage4, Savage200 and clean up Trio3D/Savage3D detection (#3382,3384 Harald Koenig). 3321. Add new framebuffer code and tiny X DDX architecture (#3379, Keith Packard). 3320. Add DGA2 documentation (#3378, Mark Vojkovich). 3319. Update XFree86 manpage wrt -bpp/-depth/-fbbpp (#3377, Andy Isaacson). 3318. Make SuperProbe check primary cards, only (#3374, Harald Koenig). 3317. Add SilkenMouse to *BSD (#3373, Matthieu Herrb). 3316. Allow SilkenMouse to work if not all drivers of an OS support SIGIO (#3372, Keith Packard). 3315. Fix a few problems in TGA driver and add support for backing store and SilkenMouse (#3371, Matt Grossman). 3314. Add smarter scheduler (#3370, Keith Packard). 3313. Xterm patch #120 (#3369, Thomas Dickey). 3312. Enable xf86SetKbdRate function on Solaris 8 (#3364, David Holland). 3311. Fix some bugs and add acceleration to Rendition server (#3360, Dejan Ilic). 3310. Make raw DDC information available as properties in the root window (#3357, Andrew Aitchison). 3309. Fix for xf86CreateRootWindow (#3355, Andrew Aitchison). 3308. Add manpage for the chips driver (#3353, David Bateman). 3307. Update contact info (#3352, Andrew van der Stock). 3306. Add kbd rate support for Linux (#3363, Harald Koenig). 3305. Update Portuguese XKB map (#3351, Joao Esteves, Francisco Colaco). 3304. Fix text clipping in 3dfx driver (#3349, Henrik Harmsen). 3303. Fix S3 ViRGE hw cursor (#3348, Harald Koenig). 3302. Fix clipping in 3dfx driver (#3342, Daryll Strauss). 3301. Enable SilkenMouse for 3dfx driver (#3341, Henrik Harmsen). 3300. Enable SIGIO support on LynxOS (#3339, Thomas Mueller). 3299. Get TRUE defined in sigio.c. Fix xterm compile problem on ISC (#3338, Michael Rohleder). 3298. Correct DPMS suspend/standby modes for 3dfx driver (#3336, Henrik Harmsen) 3297. Xterm patch #119 (#3335, Thomas Dickey).
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/*
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* $Id$
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*
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* Copyright © 1999 Keith Packard
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Keith Packard not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Keith Packard makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $XFree86: $ */
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#include "s3.h"
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/*
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* Clock synthesis:
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*
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* f_out = f_ref * ((M + 2) / ((N + 2) * (1 << R)))
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*
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* Constraints:
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*
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* 1. 135MHz <= f_ref * ((M + 2) / (N + 2)) <= 270 MHz
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* 2. N >= 1
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*
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* Vertical refresh rate = clock / ((hsize + hblank) * (vsize + vblank))
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* Horizontal refresh rate = clock / (hsize + hblank)
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*/
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/* all in kHz */
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#define MIN_VCO 180000.0
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#define MAX_VCO 360000.0
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void
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s3GetClock (S3Timing *t, int *Mp, int *Np, int *Rp, int maxM, int maxN, int maxR)
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{
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int M, N, R, bestM, bestN;
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int f_vco, f_out;
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int target;
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int err, abserr, besterr;
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target = ((t->horizontal + t->hblank) *
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(t->vertical + t->vblank) *
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t->rate) / 1000;
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/*
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* Compute correct R value to keep VCO in range
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*/
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for (R = 0; R <= maxR; R++)
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{
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f_vco = target * (1 << R);
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if (MIN_VCO <= f_vco && f_vco < MAX_VCO)
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break;
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}
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/* M = f_out / f_ref * ((N + 2) * (1 << R)); */
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besterr = target;
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for (N = 0; N <= maxN; N++)
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{
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M = (target * (N + 2) * (1 << R) + (S3_CLOCK_REF/2)) / S3_CLOCK_REF - 2;
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if (0 <= M && M <= maxM)
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{
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f_out = S3_CLOCK(M,N,R);
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err = target - f_out;
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if (err < 0)
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err = -err;
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if (err < besterr)
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{
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besterr = err;
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bestM = M;
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bestN = N;
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}
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}
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}
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*Mp = bestM;
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*Np = bestN;
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*Rp = R;
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}
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