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diff --git a/src/i830_gtf.c b/src/i830_gtf.c
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-#define DEBUG_VERB 2
-/*
- * Copyright © 2002 David Dawes
- *
- * 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 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 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 author(s).
- *
- * Authors: David Dawes <dawes@xfree86.org>
- *
- * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/vbe/vbeModes.c,v 1.6 2002/11/02 01:38:25 dawes Exp $
- */
-/*
- * Modified by Alan Hourihane <alanh@tungstengraphics.com>
- * to support extended BIOS modes for the Intel chipsets
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <stdio.h>
-#include <string.h>
-
-#include "xf86.h"
-#include "vbe.h"
-#include "vbeModes.h"
-#include "i830.h"
-#include "i830_xf86Modes.h"
-
-#include <math.h>
-
-#define rint(x) floor(x)
-
-#define MARGIN_PERCENT 1.8 /* % of active vertical image */
-#define CELL_GRAN 8.0 /* assumed character cell granularity */
-#define MIN_PORCH 1 /* minimum front porch */
-#define V_SYNC_RQD 3 /* width of vsync in lines */
-#define H_SYNC_PERCENT 8.0 /* width of hsync as % of total line */
-#define MIN_VSYNC_PLUS_BP 550.0 /* min time of vsync + back porch (microsec) */
-#define M 600.0 /* blanking formula gradient */
-#define C 40.0 /* blanking formula offset */
-#define K 128.0 /* blanking formula scaling factor */
-#define J 20.0 /* blanking formula scaling factor */
-
-/* C' and M' are part of the Blanking Duty Cycle computation */
-
-#define C_PRIME (((C - J) * K/256.0) + J)
-#define M_PRIME (K/256.0 * M)
-
-DisplayModePtr
-i830GetGTF(int h_pixels, int v_lines, float freq, int interlaced, int margins)
-{
- float h_pixels_rnd;
- float v_lines_rnd;
- float v_field_rate_rqd;
- float top_margin;
- float bottom_margin;
- float interlace;
- float h_period_est;
- float vsync_plus_bp;
- float v_back_porch;
- float total_v_lines;
- float v_field_rate_est;
- float h_period;
- float v_field_rate;
- float v_frame_rate;
- float left_margin;
- float right_margin;
- float total_active_pixels;
- float ideal_duty_cycle;
- float h_blank;
- float total_pixels;
- float pixel_freq;
- float h_freq;
-
- float h_sync;
- float h_front_porch;
- float v_odd_front_porch_lines;
- DisplayModePtr m;
-
- m = xnfcalloc(sizeof(DisplayModeRec), 1);
-
-
- /* 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:
- *
- * [H PIXELS RND] = ((ROUND([H PIXELS]/[CELL GRAN RND],0))*[CELLGRAN RND])
- */
-
- h_pixels_rnd = rint((float) h_pixels / CELL_GRAN) * 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. In either case, the
- * number of lines is rounded to the nearest integer.
- *
- * [V LINES RND] = IF([INT RQD?]="y", ROUND([V LINES]/2,0),
- * ROUND([V LINES],0))
- */
-
- v_lines_rnd = interlaced ?
- rint((float) v_lines) / 2.0 :
- rint((float) v_lines);
-
- /* 3. Find the frame rate required:
- *
- * [V FIELD RATE RQD] = IF([INT RQD?]="y", [I/P FREQ RQD]*2,
- * [I/P FREQ RQD])
- */
-
- v_field_rate_rqd = interlaced ? (freq * 2.0) : (freq);
-
- /* 4. Find number of lines in Top margin:
- *
- * [TOP MARGIN (LINES)] = IF([MARGINS RQD?]="Y",
- * ROUND(([MARGIN%]/100*[V LINES RND]),0),
- * 0)
- */
-
- top_margin = margins ? rint(MARGIN_PERCENT / 100.0 * v_lines_rnd) : (0.0);
-
- /* 5. Find number of lines in Bottom margin:
- *
- * [BOT MARGIN (LINES)] = IF([MARGINS RQD?]="Y",
- * ROUND(([MARGIN%]/100*[V LINES RND]),0),
- * 0)
- */
-
- bottom_margin = margins ? rint(MARGIN_PERCENT/100.0 * v_lines_rnd) : (0.0);
-
- /* 6. If interlace is required, then set variable [INTERLACE]=0.5:
- *
- * [INTERLACE]=(IF([INT RQD?]="y",0.5,0))
- */
-
- interlace = interlaced ? 0.5 : 0.0;
-
- /* 7. Estimate the Horizontal period
- *
- * [H PERIOD EST] = ((1/[V FIELD RATE RQD]) - [MIN VSYNC+BP]/1000000) /
- * ([V LINES RND] + (2*[TOP MARGIN (LINES)]) +
- * [MIN PORCH RND]+[INTERLACE]) * 1000000
- */
-
- h_period_est = (((1.0/v_field_rate_rqd) - (MIN_VSYNC_PLUS_BP/1000000.0))
- / (v_lines_rnd + (2*top_margin) + MIN_PORCH + interlace)
- * 1000000.0);
-
- /* 8. Find the number of lines in V sync + back porch:
- *
- * [V SYNC+BP] = ROUND(([MIN VSYNC+BP]/[H PERIOD EST]),0)
- */
-
- vsync_plus_bp = rint(MIN_VSYNC_PLUS_BP/h_period_est);
-
- /* 9. Find the number of lines in V back porch alone:
- *
- * [V BACK PORCH] = [V SYNC+BP] - [V SYNC RND]
- *
- * XXX is "[V SYNC RND]" a typo? should be [V SYNC RQD]?
- */
-
- v_back_porch = vsync_plus_bp - V_SYNC_RQD;
-
- /* 10. Find the total number of lines in Vertical field period:
- *
- * [TOTAL V LINES] = [V LINES RND] + [TOP MARGIN (LINES)] +
- * [BOT MARGIN (LINES)] + [V SYNC+BP] + [INTERLACE] +
- * [MIN PORCH RND]
- */
-
- total_v_lines = v_lines_rnd + top_margin + bottom_margin + vsync_plus_bp +
- interlace + MIN_PORCH;
-
- /* 11. Estimate the Vertical field frequency:
- *
- * [V FIELD RATE EST] = 1 / [H PERIOD EST] / [TOTAL V LINES] * 1000000
- */
-
- v_field_rate_est = 1.0 / h_period_est / total_v_lines * 1000000.0;
-
- /* 12. Find the actual horizontal period:
- *
- * [H PERIOD] = [H PERIOD EST] / ([V FIELD RATE RQD] / [V FIELD RATE EST])
- */
-
- h_period = h_period_est / (v_field_rate_rqd / v_field_rate_est);
-
- /* 13. Find the actual Vertical field frequency:
- *
- * [V FIELD RATE] = 1 / [H PERIOD] / [TOTAL V LINES] * 1000000
- */
-
- v_field_rate = 1.0 / h_period / total_v_lines * 1000000.0;
-
- /* 14. Find the Vertical frame frequency:
- *
- * [V FRAME RATE] = (IF([INT RQD?]="y", [V FIELD RATE]/2, [V FIELD RATE]))
- */
-
- v_frame_rate = interlaced ? v_field_rate / 2.0 : v_field_rate;
-
- /* 15. Find number of pixels in left margin:
- *
- * [LEFT MARGIN (PIXELS)] = (IF( [MARGINS RQD?]="Y",
- * (ROUND( ([H PIXELS RND] * [MARGIN%] / 100 /
- * [CELL GRAN RND]),0)) * [CELL GRAN RND],
- * 0))
- */
-
- left_margin = margins ?
- rint(h_pixels_rnd * MARGIN_PERCENT / 100.0 / CELL_GRAN) * CELL_GRAN :
- 0.0;
-
- /* 16. Find number of pixels in right margin:
- *
- * [RIGHT MARGIN (PIXELS)] = (IF( [MARGINS RQD?]="Y",
- * (ROUND( ([H PIXELS RND] * [MARGIN%] / 100 /
- * [CELL GRAN RND]),0)) * [CELL GRAN RND],
- * 0))
- */
-
- right_margin = margins ?
- rint(h_pixels_rnd * MARGIN_PERCENT / 100.0 / CELL_GRAN) * CELL_GRAN :
- 0.0;
-
- /* 17. Find total number of active pixels in image and left and right
- * margins:
- *
- * [TOTAL ACTIVE PIXELS] = [H PIXELS RND] + [LEFT MARGIN (PIXELS)] +
- * [RIGHT MARGIN (PIXELS)]
- */
-
- total_active_pixels = h_pixels_rnd + left_margin + right_margin;
-
- /* 18. Find the ideal blanking duty cycle from the blanking duty cycle
- * equation:
- *
- * [IDEAL DUTY CYCLE] = [C'] - ([M']*[H PERIOD]/1000)
- */
-
- ideal_duty_cycle = C_PRIME - (M_PRIME * h_period / 1000.0);
-
- /* 19. Find the number of pixels in the blanking time to the nearest
- * double character cell:
- *
- * [H BLANK (PIXELS)] = (ROUND(([TOTAL ACTIVE PIXELS] *
- * [IDEAL DUTY CYCLE] /
- * (100-[IDEAL DUTY CYCLE]) /
- * (2*[CELL GRAN RND])), 0))
- * * (2*[CELL GRAN RND])
- */
-
- h_blank = rint(total_active_pixels *
- ideal_duty_cycle /
- (100.0 - ideal_duty_cycle) /
- (2.0 * CELL_GRAN)) * (2.0 * CELL_GRAN);
-
- /* 20. Find total number of pixels:
- *
- * [TOTAL PIXELS] = [TOTAL ACTIVE PIXELS] + [H BLANK (PIXELS)]
- */
-
- total_pixels = total_active_pixels + h_blank;
-
- /* 21. Find pixel clock frequency:
- *
- * [PIXEL FREQ] = [TOTAL PIXELS] / [H PERIOD]
- */
-
- pixel_freq = total_pixels / h_period;
-
- /* 22. Find horizontal frequency:
- *
- * [H FREQ] = 1000 / [H PERIOD]
- */
-
- h_freq = 1000.0 / h_period;
-
-
- /* 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:
- *
- * [H SYNC (PIXELS)] =(ROUND(([H SYNC%] / 100 * [TOTAL PIXELS] /
- * [CELL GRAN RND]),0))*[CELL GRAN RND]
- */
-
- h_sync = rint(H_SYNC_PERCENT/100.0 * total_pixels / CELL_GRAN) * CELL_GRAN;
-
- /* 18. Find the number of pixels in the horizontal front porch period:
- *
- * [H FRONT PORCH (PIXELS)] = ([H BLANK (PIXELS)]/2)-[H SYNC (PIXELS)]
- */
-
- h_front_porch = (h_blank / 2.0) - h_sync;
-
- /* 36. Find the number of lines in the odd front porch period:
- *
- * [V ODD FRONT PORCH(LINES)]=([MIN PORCH RND]+[INTERLACE])
- */
-
- v_odd_front_porch_lines = MIN_PORCH + interlace;
-
- /* finally, pack the results in the DisplayMode struct */
-
- m->HDisplay = (int) (h_pixels_rnd);
- m->HSyncStart = (int) (h_pixels_rnd + h_front_porch);
- m->HSyncEnd = (int) (h_pixels_rnd + h_front_porch + h_sync);
- m->HTotal = (int) (total_pixels);
-
- m->VDisplay = (int) (v_lines_rnd);
- m->VSyncStart = (int) (v_lines_rnd + v_odd_front_porch_lines);
- m->VSyncEnd = (int) (int) (v_lines_rnd + v_odd_front_porch_lines + V_SYNC_RQD);
- m->VTotal = (int) (total_v_lines);
-
- m->Clock = (int)(pixel_freq * 1000);
- m->SynthClock = m->Clock;
- m->HSync = h_freq;
- m->VRefresh = v_frame_rate /* freq */;
-
- i830xf86SetModeDefaultName(m);
-
- return (m);
-}
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