[deb_xorg-server.git] / hw / xfree86 / modes / xf86cvt.c

/*
 * Copyright 2005-2006 Luc Verhaegen.
 *
 * 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.
 */

/*
 * The reason for having this function in a file of its own is
 * so that ../utils/cvt/cvt can link to it, and that xf86CVTMode
 * code is shared directly.
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#else
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#endif

#include "xf86.h"
#include "xf86Modes.h"

#include <string.h>

/*
 * Generate a CVT standard mode from HDisplay, VDisplay and VRefresh.
 *
 * These calculations are stolen from the CVT calculation spreadsheet written
 * by Graham Loveridge. He seems to be claiming no copyright and there seems to
 * be no license attached to this. He apparently just wants to see his name
 * mentioned.
 *
 * This file can be found at http://www.vesa.org/Public/CVT/CVTd6r1.xls
 *
 * Comments and structure corresponds to the comments and structure of the xls.
 * This should ease importing of future changes to the standard (not very
 * likely though).
 *
 * About margins; i'm sure that they are to be the bit between HDisplay and
 * HBlankStart, HBlankEnd and HTotal, VDisplay and VBlankStart, VBlankEnd and 
 * VTotal, where the overscan colour is shown. FB seems to call _all_ blanking
 * outside sync "margin" for some reason. Since we prefer seeing proper
 * blanking instead of the overscan colour, and since the Crtc* values will
 * probably get altered after us, we will disable margins altogether. With
 * these calculations, Margins will plainly expand H/VDisplay, and we don't
 * want that. -- libv
 *
 */
DisplayModePtr
xf86CVTMode(int HDisplay, int VDisplay, float VRefresh, Bool Reduced,
            Bool Interlaced)
{
    DisplayModeRec *Mode = xnfcalloc(1, sizeof(DisplayModeRec));

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

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

    /* 4) 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

    Bool Margins = FALSE;
    float VFieldRate, HPeriod;
    int HDisplayRnd, HMargin;
    int VDisplayRnd, VMargin, VSync;
    float Interlace;            /* Please rename this */

    /* CVT default is 60.0Hz */
    if (!VRefresh)
        VRefresh = 60.0;

    /* 1. Required field rate */
    if (Interlaced)
        VFieldRate = VRefresh * 2;
    else
        VFieldRate = VRefresh;

    /* 2. Horizontal pixels */
    HDisplayRnd = HDisplay - (HDisplay % CVT_H_GRANULARITY);

    /* 3. Determine left and right borders */
    if (Margins) {
        /* right margin is actually exactly the same as left */
        HMargin = (((float) HDisplayRnd) * CVT_MARGIN_PERCENTAGE / 100.0);
        HMargin -= HMargin % CVT_H_GRANULARITY;
    }
    else
        HMargin = 0;

    /* 4. Find total active pixels */
    Mode->HDisplay = HDisplayRnd + 2 * HMargin;

    /* 5. Find number of lines per field */
    if (Interlaced)
        VDisplayRnd = VDisplay / 2;
    else
        VDisplayRnd = VDisplay;

    /* 6. Find top and bottom margins */
    /* nope. */
    if (Margins)
        /* top and bottom margins are equal again. */
        VMargin = (((float) VDisplayRnd) * CVT_MARGIN_PERCENTAGE / 100.0);
    else
        VMargin = 0;

    Mode->VDisplay = VDisplay + 2 * VMargin;

    /* 7. Interlace */
    if (Interlaced)
        Interlace = 0.5;
    else
        Interlace = 0.0;

    /* 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) {             /* simplified GTF calculation */

        /* 4) Minimum time of vertical sync + back porch interval (µs) 
         * default 550.0 */
#define CVT_MIN_VSYNC_BP 550.0

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

        float HBlankPercentage;
        int VSyncAndBackPorch, VBackPorch;
        int HBlank;

        /* 8. Estimated Horizontal period */
        HPeriod = ((float) (1000000.0 / VFieldRate - CVT_MIN_VSYNC_BP)) /
            (VDisplayRnd + 2 * VMargin + CVT_MIN_V_PORCH + Interlace);

        /* 9. Find number of lines in sync + backporch */
        if (((int) (CVT_MIN_VSYNC_BP / HPeriod) + 1) <
            (VSync + CVT_MIN_V_PORCH))
            VSyncAndBackPorch = VSync + CVT_MIN_V_PORCH;
        else
            VSyncAndBackPorch = (int) (CVT_MIN_VSYNC_BP / HPeriod) + 1;

        /* 10. Find number of lines in back porch */
        VBackPorch = VSyncAndBackPorch - VSync;

        /* 11. Find total number of lines in vertical field */
        Mode->VTotal = VDisplayRnd + 2 * VMargin + VSyncAndBackPorch + Interlace
            + 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 */
        HBlankPercentage = CVT_C_PRIME - CVT_M_PRIME * HPeriod / 1000.0;

        /* 13. Blanking time */
        if (HBlankPercentage < 20)
            HBlankPercentage = 20;

        HBlank = Mode->HDisplay * HBlankPercentage / (100.0 - HBlankPercentage);
        HBlank -= HBlank % (2 * CVT_H_GRANULARITY);

        /* 14. Find total number of pixels in a line. */
        Mode->HTotal = Mode->HDisplay + HBlank;

        /* Fill in HSync values */
        Mode->HSyncEnd = Mode->HDisplay + HBlank / 2;

        Mode->HSyncStart = Mode->HSyncEnd -
            (Mode->HTotal * CVT_HSYNC_PERCENTAGE) / 100;
        Mode->HSyncStart += CVT_H_GRANULARITY -
            Mode->HSyncStart % CVT_H_GRANULARITY;

        /* Fill in VSync values */
        Mode->VSyncStart = Mode->VDisplay + CVT_MIN_V_PORCH;
        Mode->VSyncEnd = Mode->VSyncStart + VSync;

    }
    else {                      /* Reduced blanking */
        /* Minimum vertical blanking interval time (µs) - default 460 */
#define CVT_RB_MIN_VBLANK 460.0

        /* Fixed number of clocks for horizontal sync */
#define CVT_RB_H_SYNC 32.0

        /* Fixed number of clocks for horizontal blanking */
#define CVT_RB_H_BLANK 160.0

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

        int VBILines;

        /* 8. Estimate Horizontal period. */
        HPeriod = ((float) (1000000.0 / VFieldRate - CVT_RB_MIN_VBLANK)) /
            (VDisplayRnd + 2 * VMargin);

        /* 9. Find number of lines in vertical blanking */
        VBILines = ((float) CVT_RB_MIN_VBLANK) / 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 */
        Mode->VTotal = VDisplayRnd + 2 * VMargin + Interlace + VBILines;

        /* 12. Find total number of pixels in a line */
        Mode->HTotal = Mode->HDisplay + CVT_RB_H_BLANK;

        /* Fill in HSync values */
        Mode->HSyncEnd = Mode->HDisplay + CVT_RB_H_BLANK / 2;
        Mode->HSyncStart = Mode->HSyncEnd - CVT_RB_H_SYNC;

        /* Fill in VSync values */
        Mode->VSyncStart = Mode->VDisplay + CVT_RB_VFPORCH;
        Mode->VSyncEnd = Mode->VSyncStart + VSync;
    }

    /* 15/13. Find pixel clock frequency (kHz for xf86) */
    Mode->Clock = Mode->HTotal * 1000.0 / HPeriod;
    Mode->Clock -= Mode->Clock % CVT_CLOCK_STEP;

    /* 16/14. Find actual Horizontal Frequency (kHz) */
    Mode->HSync = ((float) Mode->Clock) / ((float) Mode->HTotal);

    /* 17/15. Find actual Field rate */
    Mode->VRefresh = (1000.0 * ((float) Mode->Clock)) /
        ((float) (Mode->HTotal * Mode->VTotal));

    /* 18/16. Find actual vertical frame frequency */
    /* ignore - just set the mode flag for interlaced */
    if (Interlaced)
        Mode->VTotal *= 2;

    XNFasprintf(&Mode->name, "%dx%d", HDisplay, VDisplay);

    if (Reduced)
        Mode->Flags |= V_PHSYNC | V_NVSYNC;
    else
        Mode->Flags |= V_NHSYNC | V_PVSYNC;

    if (Interlaced)
        Mode->Flags |= V_INTERLACE;

    return Mode;
}
Commit	Line	Data
a09e091a JB	1	/*
	2	* Copyright 2005-2006 Luc Verhaegen.
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice shall be included in
	12	* all copies or substantial portions of the Software.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	17	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	18	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	19	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	20	* OTHER DEALINGS IN THE SOFTWARE.
	21	*/
	22
	23	/*
	24	* The reason for having this function in a file of its own is
	25	* so that ../utils/cvt/cvt can link to it, and that xf86CVTMode
	26	* code is shared directly.
	27	*/
	28
	29	#ifdef HAVE_XORG_CONFIG_H
	30	#include <xorg-config.h>
	31	#else
	32	#ifdef HAVE_CONFIG_H
	33	#include <config.h>
	34	#endif
	35	#endif
	36
	37	#include "xf86.h"
	38	#include "xf86Modes.h"
	39
	40	#include <string.h>
	41
	42	/*
	43	* Generate a CVT standard mode from HDisplay, VDisplay and VRefresh.
	44	*
	45	* These calculations are stolen from the CVT calculation spreadsheet written
	46	* by Graham Loveridge. He seems to be claiming no copyright and there seems to
	47	* be no license attached to this. He apparently just wants to see his name
	48	* mentioned.
	49	*
	50	* This file can be found at http://www.vesa.org/Public/CVT/CVTd6r1.xls
	51	*
	52	* Comments and structure corresponds to the comments and structure of the xls.
	53	* This should ease importing of future changes to the standard (not very
	54	* likely though).
	55	*
	56	* About margins; i'm sure that they are to be the bit between HDisplay and
	57	* HBlankStart, HBlankEnd and HTotal, VDisplay and VBlankStart, VBlankEnd and
	58	* VTotal, where the overscan colour is shown. FB seems to call _all_ blanking
	59	* outside sync "margin" for some reason. Since we prefer seeing proper
	60	* blanking instead of the overscan colour, and since the Crtc* values will
	61	* probably get altered after us, we will disable margins altogether. With
	62	* these calculations, Margins will plainly expand H/VDisplay, and we don't
	63	* want that. -- libv
	64	*
65	*/
66	DisplayModePtr
67	xf86CVTMode(int HDisplay, int VDisplay, float VRefresh, Bool Reduced,
68	Bool Interlaced)
69	{
70	DisplayModeRec *Mode = xnfcalloc(1, sizeof(DisplayModeRec));
71
72	/* 1) top/bottom margin size (% of height) - default: 1.8 */
73	#define CVT_MARGIN_PERCENTAGE 1.8
74
75	/* 2) character cell horizontal granularity (pixels) - default 8 */
76	#define CVT_H_GRANULARITY 8
77
78	/* 4) Minimum vertical porch (lines) - default 3 */
79	#define CVT_MIN_V_PORCH 3
80
81	/* 4) Minimum number of vertical back porch lines - default 6 */
82	#define CVT_MIN_V_BPORCH 6
83
84	/* Pixel Clock step (kHz) */
85	#define CVT_CLOCK_STEP 250
86
87	Bool Margins = FALSE;
88	float VFieldRate, HPeriod;
89	int HDisplayRnd, HMargin;
90	int VDisplayRnd, VMargin, VSync;
91	float Interlace; /* Please rename this */
92
93	/* CVT default is 60.0Hz */
94	if (!VRefresh)
95	VRefresh = 60.0;
96
97	/* 1. Required field rate */
98	if (Interlaced)
99	VFieldRate = VRefresh * 2;
100	else
101	VFieldRate = VRefresh;
102
103	/* 2. Horizontal pixels */
104	HDisplayRnd = HDisplay - (HDisplay % CVT_H_GRANULARITY);
105
106	/* 3. Determine left and right borders */
107	if (Margins) {
108	/* right margin is actually exactly the same as left */
109	HMargin = (((float) HDisplayRnd) * CVT_MARGIN_PERCENTAGE / 100.0);
110	HMargin -= HMargin % CVT_H_GRANULARITY;
111	}
112	else
113	HMargin = 0;
114
115	/* 4. Find total active pixels */
116	Mode->HDisplay = HDisplayRnd + 2 * HMargin;
117
118	/* 5. Find number of lines per field */
119	if (Interlaced)
120	VDisplayRnd = VDisplay / 2;
121	else
122	VDisplayRnd = VDisplay;
123
124	/* 6. Find top and bottom margins */
125	/* nope. */
126	if (Margins)
127	/* top and bottom margins are equal again. */
128	VMargin = (((float) VDisplayRnd) * CVT_MARGIN_PERCENTAGE / 100.0);
129	else
130	VMargin = 0;
131
132	Mode->VDisplay = VDisplay + 2 * VMargin;
133
134	/* 7. Interlace */
135	if (Interlaced)
136	Interlace = 0.5;
137	else
138	Interlace = 0.0;
139
140	/* Determine VSync Width from aspect ratio */
141	if (!(VDisplay % 3) && ((VDisplay * 4 / 3) == HDisplay))
142	VSync = 4;
143	else if (!(VDisplay % 9) && ((VDisplay * 16 / 9) == HDisplay))
144	VSync = 5;
145	else if (!(VDisplay % 10) && ((VDisplay * 16 / 10) == HDisplay))
146	VSync = 6;
147	else if (!(VDisplay % 4) && ((VDisplay * 5 / 4) == HDisplay))
148	VSync = 7;
149	else if (!(VDisplay % 9) && ((VDisplay * 15 / 9) == HDisplay))
150	VSync = 7;
151	else /* Custom */
152	VSync = 10;
153
154	if (!Reduced) { /* simplified GTF calculation */
155
156	/* 4) Minimum time of vertical sync + back porch interval (µs)
157	* default 550.0 */
158	#define CVT_MIN_VSYNC_BP 550.0
159
160	/* 3) Nominal HSync width (% of line period) - default 8 */
161	#define CVT_HSYNC_PERCENTAGE 8
162
163	float HBlankPercentage;
164	int VSyncAndBackPorch, VBackPorch;
165	int HBlank;
166
167	/* 8. Estimated Horizontal period */
168	HPeriod = ((float) (1000000.0 / VFieldRate - CVT_MIN_VSYNC_BP)) /
169	(VDisplayRnd + 2 * VMargin + CVT_MIN_V_PORCH + Interlace);
170
171	/* 9. Find number of lines in sync + backporch */
172	if (((int) (CVT_MIN_VSYNC_BP / HPeriod) + 1) <
173	(VSync + CVT_MIN_V_PORCH))
174	VSyncAndBackPorch = VSync + CVT_MIN_V_PORCH;
175	else
176	VSyncAndBackPorch = (int) (CVT_MIN_VSYNC_BP / HPeriod) + 1;
177
178	/* 10. Find number of lines in back porch */
179	VBackPorch = VSyncAndBackPorch - VSync;
180
181	/* 11. Find total number of lines in vertical field */
182	Mode->VTotal = VDisplayRnd + 2 * VMargin + VSyncAndBackPorch + Interlace
183	+ CVT_MIN_V_PORCH;
184
185	/* 5) Definition of Horizontal blanking time limitation */
186	/* Gradient (%/kHz) - default 600 */
187	#define CVT_M_FACTOR 600
188
189	/* Offset (%) - default 40 */
190	#define CVT_C_FACTOR 40
191
192	/* Blanking time scaling factor - default 128 */
193	#define CVT_K_FACTOR 128
194
195	/* Scaling factor weighting - default 20 */
196	#define CVT_J_FACTOR 20
197
198	#define CVT_M_PRIME CVT_M_FACTOR * CVT_K_FACTOR / 256
199	#define CVT_C_PRIME (CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
200	CVT_J_FACTOR
201
202	/* 12. Find ideal blanking duty cycle from formula */
203	HBlankPercentage = CVT_C_PRIME - CVT_M_PRIME * HPeriod / 1000.0;
204
205	/* 13. Blanking time */
206	if (HBlankPercentage < 20)
207	HBlankPercentage = 20;
208
209	HBlank = Mode->HDisplay * HBlankPercentage / (100.0 - HBlankPercentage);
210	HBlank -= HBlank % (2 * CVT_H_GRANULARITY);
211
212	/* 14. Find total number of pixels in a line. */
213	Mode->HTotal = Mode->HDisplay + HBlank;
214
215	/* Fill in HSync values */
216	Mode->HSyncEnd = Mode->HDisplay + HBlank / 2;
217
218	Mode->HSyncStart = Mode->HSyncEnd -
219	(Mode->HTotal * CVT_HSYNC_PERCENTAGE) / 100;
220	Mode->HSyncStart += CVT_H_GRANULARITY -
221	Mode->HSyncStart % CVT_H_GRANULARITY;
222
223	/* Fill in VSync values */
224	Mode->VSyncStart = Mode->VDisplay + CVT_MIN_V_PORCH;
225	Mode->VSyncEnd = Mode->VSyncStart + VSync;
226
227	}
228	else { /* Reduced blanking */
229	/* Minimum vertical blanking interval time (µs) - default 460 */
230	#define CVT_RB_MIN_VBLANK 460.0
231
232	/* Fixed number of clocks for horizontal sync */
233	#define CVT_RB_H_SYNC 32.0
234
235	/* Fixed number of clocks for horizontal blanking */
236	#define CVT_RB_H_BLANK 160.0
237
238	/* Fixed number of lines for vertical front porch - default 3 */
239	#define CVT_RB_VFPORCH 3
240
241	int VBILines;
242
243	/* 8. Estimate Horizontal period. */
244	HPeriod = ((float) (1000000.0 / VFieldRate - CVT_RB_MIN_VBLANK)) /
245	(VDisplayRnd + 2 * VMargin);
246
247	/* 9. Find number of lines in vertical blanking */
248	VBILines = ((float) CVT_RB_MIN_VBLANK) / HPeriod + 1;
249
250	/* 10. Check if vertical blanking is sufficient */
251	if (VBILines < (CVT_RB_VFPORCH + VSync + CVT_MIN_V_BPORCH))
252	VBILines = CVT_RB_VFPORCH + VSync + CVT_MIN_V_BPORCH;
253
254	/* 11. Find total number of lines in vertical field */
255	Mode->VTotal = VDisplayRnd + 2 * VMargin + Interlace + VBILines;
256
257	/* 12. Find total number of pixels in a line */
258	Mode->HTotal = Mode->HDisplay + CVT_RB_H_BLANK;
259
260	/* Fill in HSync values */
261	Mode->HSyncEnd = Mode->HDisplay + CVT_RB_H_BLANK / 2;
262	Mode->HSyncStart = Mode->HSyncEnd - CVT_RB_H_SYNC;
263
264	/* Fill in VSync values */
265	Mode->VSyncStart = Mode->VDisplay + CVT_RB_VFPORCH;
266	Mode->VSyncEnd = Mode->VSyncStart + VSync;
267	}
268
269	/* 15/13. Find pixel clock frequency (kHz for xf86) */
270	Mode->Clock = Mode->HTotal * 1000.0 / HPeriod;
271	Mode->Clock -= Mode->Clock % CVT_CLOCK_STEP;
272
273	/* 16/14. Find actual Horizontal Frequency (kHz) */
274	Mode->HSync = ((float) Mode->Clock) / ((float) Mode->HTotal);
275
276	/* 17/15. Find actual Field rate */
277	Mode->VRefresh = (1000.0 * ((float) Mode->Clock)) /
278	((float) (Mode->HTotal * Mode->VTotal));
279
280	/* 18/16. Find actual vertical frame frequency */
281	/* ignore - just set the mode flag for interlaced */
282	if (Interlaced)
283	Mode->VTotal *= 2;
284
285	XNFasprintf(&Mode->name, "%dx%d", HDisplay, VDisplay);
286
287	if (Reduced)
288	Mode->Flags \|= V_PHSYNC \| V_NVSYNC;
289	else
290	Mode->Flags \|= V_NHSYNC \| V_PVSYNC;
291
292	if (Interlaced)
293	Mode->Flags \|= V_INTERLACE;
294
295	return Mode;
296	}