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fbmon.c
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fbmon.c
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/*
* linux/drivers/video/fbmon.c
*
* Copyright (C) 2002 James Simmons <[email protected]>
*
* Credits:
*
* The EDID Parser is a conglomeration from the following sources:
*
* 1. SciTech SNAP Graphics Architecture
* Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved.
*
* 2. XFree86 4.3.0, interpret_edid.c
* Copyright 1998 by Egbert Eich <[email protected]>
*
* 3. John Fremlin <[email protected]> and
* Ani Joshi <[email protected]>
*
* Generalized Timing Formula is derived from:
*
* GTF Spreadsheet by Andy Morrish (1/5/97)
* available at http://www.vesa.org
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
*/
#include <linux/tty.h>
#include <linux/fb.h>
#include <linux/module.h>
#include <video/edid.h>
#ifdef CONFIG_PPC_OF
#include <linux/pci.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#endif
#include "edid.h"
/*
* EDID parser
*/
#undef DEBUG /* define this for verbose EDID parsing output */
#ifdef DEBUG
#define DPRINTK(fmt, args...) printk(fmt,## args)
#else
#define DPRINTK(fmt, args...)
#endif
#define FBMON_FIX_HEADER 1
#define FBMON_FIX_INPUT 2
#ifdef CONFIG_FB_MODE_HELPERS
struct broken_edid {
u8 manufacturer[4];
u32 model;
u32 fix;
};
static struct broken_edid brokendb[] = {
/* DEC FR-PCXAV-YZ */
{
.manufacturer = "DEC",
.model = 0x073a,
.fix = FBMON_FIX_HEADER,
},
/* ViewSonic PF775a */
{
.manufacturer = "VSC",
.model = 0x5a44,
.fix = FBMON_FIX_INPUT,
},
};
static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0x00
};
static void copy_string(unsigned char *c, unsigned char *s)
{
int i;
c = c + 5;
for (i = 0; (i < 13 && *c != 0x0A); i++)
*(s++) = *(c++);
*s = 0;
while (i-- && (*--s == 0x20)) *s = 0;
}
static int check_edid(unsigned char *edid)
{
unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];
unsigned char *b;
u32 model;
int i, fix = 0, ret = 0;
manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
manufacturer[1] = ((block[0] & 0x03) << 3) +
((block[1] & 0xe0) >> 5) + '@';
manufacturer[2] = (block[1] & 0x1f) + '@';
manufacturer[3] = 0;
model = block[2] + (block[3] << 8);
for (i = 0; i < ARRAY_SIZE(brokendb); i++) {
if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) &&
brokendb[i].model == model) {
printk("fbmon: The EDID Block of "
"Manufacturer: %s Model: 0x%x is known to "
"be broken,\n", manufacturer, model);
fix = brokendb[i].fix;
break;
}
}
switch (fix) {
case FBMON_FIX_HEADER:
for (i = 0; i < 8; i++) {
if (edid[i] != edid_v1_header[i])
ret = fix;
}
break;
case FBMON_FIX_INPUT:
b = edid + EDID_STRUCT_DISPLAY;
/* Only if display is GTF capable will
the input type be reset to analog */
if (b[4] & 0x01 && b[0] & 0x80)
ret = fix;
break;
}
return ret;
}
static void fix_edid(unsigned char *edid, int fix)
{
unsigned char *b;
switch (fix) {
case FBMON_FIX_HEADER:
printk("fbmon: trying a header reconstruct\n");
memcpy(edid, edid_v1_header, 8);
break;
case FBMON_FIX_INPUT:
printk("fbmon: trying to fix input type\n");
b = edid + EDID_STRUCT_DISPLAY;
b[0] &= ~0x80;
edid[127] += 0x80;
}
}
static int edid_checksum(unsigned char *edid)
{
unsigned char i, csum = 0, all_null = 0;
int err = 0, fix = check_edid(edid);
if (fix)
fix_edid(edid, fix);
for (i = 0; i < EDID_LENGTH; i++) {
csum += edid[i];
all_null |= edid[i];
}
if (csum == 0x00 && all_null) {
/* checksum passed, everything's good */
err = 1;
}
return err;
}
static int edid_check_header(unsigned char *edid)
{
int i, err = 1, fix = check_edid(edid);
if (fix)
fix_edid(edid, fix);
for (i = 0; i < 8; i++) {
if (edid[i] != edid_v1_header[i])
err = 0;
}
return err;
}
static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs)
{
specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';
specs->manufacturer[1] = ((block[0] & 0x03) << 3) +
((block[1] & 0xe0) >> 5) + '@';
specs->manufacturer[2] = (block[1] & 0x1f) + '@';
specs->manufacturer[3] = 0;
specs->model = block[2] + (block[3] << 8);
specs->serial = block[4] + (block[5] << 8) +
(block[6] << 16) + (block[7] << 24);
specs->year = block[9] + 1990;
specs->week = block[8];
DPRINTK(" Manufacturer: %s\n", specs->manufacturer);
DPRINTK(" Model: %x\n", specs->model);
DPRINTK(" Serial#: %u\n", specs->serial);
DPRINTK(" Year: %u Week %u\n", specs->year, specs->week);
}
static void get_dpms_capabilities(unsigned char flags,
struct fb_monspecs *specs)
{
specs->dpms = 0;
if (flags & DPMS_ACTIVE_OFF)
specs->dpms |= FB_DPMS_ACTIVE_OFF;
if (flags & DPMS_SUSPEND)
specs->dpms |= FB_DPMS_SUSPEND;
if (flags & DPMS_STANDBY)
specs->dpms |= FB_DPMS_STANDBY;
DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n",
(flags & DPMS_ACTIVE_OFF) ? "yes" : "no",
(flags & DPMS_SUSPEND) ? "yes" : "no",
(flags & DPMS_STANDBY) ? "yes" : "no");
}
static void get_chroma(unsigned char *block, struct fb_monspecs *specs)
{
int tmp;
DPRINTK(" Chroma\n");
/* Chromaticity data */
tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2);
tmp *= 1000;
tmp += 512;
specs->chroma.redx = tmp/1024;
DPRINTK(" RedX: 0.%03d ", specs->chroma.redx);
tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2);
tmp *= 1000;
tmp += 512;
specs->chroma.redy = tmp/1024;
DPRINTK("RedY: 0.%03d\n", specs->chroma.redy);
tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2);
tmp *= 1000;
tmp += 512;
specs->chroma.greenx = tmp/1024;
DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx);
tmp = (block[5] & 3) | (block[0xa] << 2);
tmp *= 1000;
tmp += 512;
specs->chroma.greeny = tmp/1024;
DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny);
tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2);
tmp *= 1000;
tmp += 512;
specs->chroma.bluex = tmp/1024;
DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex);
tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2);
tmp *= 1000;
tmp += 512;
specs->chroma.bluey = tmp/1024;
DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey);
tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2);
tmp *= 1000;
tmp += 512;
specs->chroma.whitex = tmp/1024;
DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex);
tmp = (block[6] & 3) | (block[0xe] << 2);
tmp *= 1000;
tmp += 512;
specs->chroma.whitey = tmp/1024;
DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey);
}
static int edid_is_serial_block(unsigned char *block)
{
if ((block[0] == 0x00) && (block[1] == 0x00) &&
(block[2] == 0x00) && (block[3] == 0xff) &&
(block[4] == 0x00))
return 1;
else
return 0;
}
static int edid_is_ascii_block(unsigned char *block)
{
if ((block[0] == 0x00) && (block[1] == 0x00) &&
(block[2] == 0x00) && (block[3] == 0xfe) &&
(block[4] == 0x00))
return 1;
else
return 0;
}
static int edid_is_limits_block(unsigned char *block)
{
if ((block[0] == 0x00) && (block[1] == 0x00) &&
(block[2] == 0x00) && (block[3] == 0xfd) &&
(block[4] == 0x00))
return 1;
else
return 0;
}
static int edid_is_monitor_block(unsigned char *block)
{
if ((block[0] == 0x00) && (block[1] == 0x00) &&
(block[2] == 0x00) && (block[3] == 0xfc) &&
(block[4] == 0x00))
return 1;
else
return 0;
}
static void calc_mode_timings(int xres, int yres, int refresh,
struct fb_videomode *mode)
{
struct fb_var_screeninfo var;
struct fb_info info;
memset(&var, 0, sizeof(struct fb_var_screeninfo));
var.xres = xres;
var.yres = yres;
fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
refresh, &var, &info);
mode->xres = xres;
mode->yres = yres;
mode->pixclock = var.pixclock;
mode->refresh = refresh;
mode->left_margin = var.left_margin;
mode->right_margin = var.right_margin;
mode->upper_margin = var.upper_margin;
mode->lower_margin = var.lower_margin;
mode->hsync_len = var.hsync_len;
mode->vsync_len = var.vsync_len;
mode->vmode = 0;
mode->sync = 0;
}
static int get_est_timing(unsigned char *block, struct fb_videomode *mode)
{
int num = 0;
unsigned char c;
c = block[0];
if (c&0x80) {
calc_mode_timings(720, 400, 70, &mode[num]);
mode[num++].flag = FB_MODE_IS_CALCULATED;
DPRINTK(" 720x400@70Hz\n");
}
if (c&0x40) {
calc_mode_timings(720, 400, 88, &mode[num]);
mode[num++].flag = FB_MODE_IS_CALCULATED;
DPRINTK(" 720x400@88Hz\n");
}
if (c&0x20) {
mode[num++] = vesa_modes[3];
DPRINTK(" 640x480@60Hz\n");
}
if (c&0x10) {
calc_mode_timings(640, 480, 67, &mode[num]);
mode[num++].flag = FB_MODE_IS_CALCULATED;
DPRINTK(" 640x480@67Hz\n");
}
if (c&0x08) {
mode[num++] = vesa_modes[4];
DPRINTK(" 640x480@72Hz\n");
}
if (c&0x04) {
mode[num++] = vesa_modes[5];
DPRINTK(" 640x480@75Hz\n");
}
if (c&0x02) {
mode[num++] = vesa_modes[7];
DPRINTK(" 800x600@56Hz\n");
}
if (c&0x01) {
mode[num++] = vesa_modes[8];
DPRINTK(" 800x600@60Hz\n");
}
c = block[1];
if (c&0x80) {
mode[num++] = vesa_modes[9];
DPRINTK(" 800x600@72Hz\n");
}
if (c&0x40) {
mode[num++] = vesa_modes[10];
DPRINTK(" 800x600@75Hz\n");
}
if (c&0x20) {
calc_mode_timings(832, 624, 75, &mode[num]);
mode[num++].flag = FB_MODE_IS_CALCULATED;
DPRINTK(" 832x624@75Hz\n");
}
if (c&0x10) {
mode[num++] = vesa_modes[12];
DPRINTK(" 1024x768@87Hz Interlaced\n");
}
if (c&0x08) {
mode[num++] = vesa_modes[13];
DPRINTK(" 1024x768@60Hz\n");
}
if (c&0x04) {
mode[num++] = vesa_modes[14];
DPRINTK(" 1024x768@70Hz\n");
}
if (c&0x02) {
mode[num++] = vesa_modes[15];
DPRINTK(" 1024x768@75Hz\n");
}
if (c&0x01) {
mode[num++] = vesa_modes[21];
DPRINTK(" 1280x1024@75Hz\n");
}
c = block[2];
if (c&0x80) {
mode[num++] = vesa_modes[17];
DPRINTK(" 1152x870@75Hz\n");
}
DPRINTK(" Manufacturer's mask: %x\n",c&0x7F);
return num;
}
static int get_std_timing(unsigned char *block, struct fb_videomode *mode)
{
int xres, yres = 0, refresh, ratio, i;
xres = (block[0] + 31) * 8;
if (xres <= 256)
return 0;
ratio = (block[1] & 0xc0) >> 6;
switch (ratio) {
case 0:
yres = xres;
break;
case 1:
yres = (xres * 3)/4;
break;
case 2:
yres = (xres * 4)/5;
break;
case 3:
yres = (xres * 9)/16;
break;
}
refresh = (block[1] & 0x3f) + 60;
DPRINTK(" %dx%d@%dHz\n", xres, yres, refresh);
for (i = 0; i < VESA_MODEDB_SIZE; i++) {
if (vesa_modes[i].xres == xres &&
vesa_modes[i].yres == yres &&
vesa_modes[i].refresh == refresh) {
*mode = vesa_modes[i];
mode->flag |= FB_MODE_IS_STANDARD;
return 1;
}
}
calc_mode_timings(xres, yres, refresh, mode);
return 1;
}
static int get_dst_timing(unsigned char *block,
struct fb_videomode *mode)
{
int j, num = 0;
for (j = 0; j < 6; j++, block+= STD_TIMING_DESCRIPTION_SIZE)
num += get_std_timing(block, &mode[num]);
return num;
}
static void get_detailed_timing(unsigned char *block,
struct fb_videomode *mode)
{
mode->xres = H_ACTIVE;
mode->yres = V_ACTIVE;
mode->pixclock = PIXEL_CLOCK;
mode->pixclock /= 1000;
mode->pixclock = KHZ2PICOS(mode->pixclock);
mode->right_margin = H_SYNC_OFFSET;
mode->left_margin = (H_ACTIVE + H_BLANKING) -
(H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
mode->upper_margin = V_BLANKING - V_SYNC_OFFSET -
V_SYNC_WIDTH;
mode->lower_margin = V_SYNC_OFFSET;
mode->hsync_len = H_SYNC_WIDTH;
mode->vsync_len = V_SYNC_WIDTH;
if (HSYNC_POSITIVE)
mode->sync |= FB_SYNC_HOR_HIGH_ACT;
if (VSYNC_POSITIVE)
mode->sync |= FB_SYNC_VERT_HIGH_ACT;
mode->refresh = PIXEL_CLOCK/((H_ACTIVE + H_BLANKING) *
(V_ACTIVE + V_BLANKING));
mode->vmode = 0;
mode->flag = FB_MODE_IS_DETAILED;
DPRINTK(" %d MHz ", PIXEL_CLOCK/1000000);
DPRINTK("%d %d %d %d ", H_ACTIVE, H_ACTIVE + H_SYNC_OFFSET,
H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH, H_ACTIVE + H_BLANKING);
DPRINTK("%d %d %d %d ", V_ACTIVE, V_ACTIVE + V_SYNC_OFFSET,
V_ACTIVE + V_SYNC_OFFSET + V_SYNC_WIDTH, V_ACTIVE + V_BLANKING);
DPRINTK("%sHSync %sVSync\n\n", (HSYNC_POSITIVE) ? "+" : "-",
(VSYNC_POSITIVE) ? "+" : "-");
}
/**
* fb_create_modedb - create video mode database
* @edid: EDID data
* @dbsize: database size
*
* RETURNS: struct fb_videomode, @dbsize contains length of database
*
* DESCRIPTION:
* This function builds a mode database using the contents of the EDID
* data
*/
static struct fb_videomode *fb_create_modedb(unsigned char *edid, int *dbsize)
{
struct fb_videomode *mode, *m;
unsigned char *block;
int num = 0, i;
mode = kmalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
if (mode == NULL)
return NULL;
memset(mode, 0, 50 * sizeof(struct fb_videomode));
if (edid == NULL || !edid_checksum(edid) ||
!edid_check_header(edid)) {
kfree(mode);
return NULL;
}
*dbsize = 0;
DPRINTK(" Detailed Timings\n");
block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
int first = 1;
if (!(block[0] == 0x00 && block[1] == 0x00)) {
get_detailed_timing(block, &mode[num]);
if (first) {
mode[num].flag |= FB_MODE_IS_FIRST;
first = 0;
}
num++;
}
}
DPRINTK(" Supported VESA Modes\n");
block = edid + ESTABLISHED_TIMING_1;
num += get_est_timing(block, &mode[num]);
DPRINTK(" Standard Timings\n");
block = edid + STD_TIMING_DESCRIPTIONS_START;
for (i = 0; i < STD_TIMING; i++, block += STD_TIMING_DESCRIPTION_SIZE)
num += get_std_timing(block, &mode[num]);
block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
for (i = 0; i < 4; i++, block+= DETAILED_TIMING_DESCRIPTION_SIZE) {
if (block[0] == 0x00 && block[1] == 0x00 && block[3] == 0xfa)
num += get_dst_timing(block + 5, &mode[num]);
}
/* Yikes, EDID data is totally useless */
if (!num) {
kfree(mode);
return NULL;
}
*dbsize = num;
m = kmalloc(num * sizeof(struct fb_videomode), GFP_KERNEL);
if (!m)
return mode;
memmove(m, mode, num * sizeof(struct fb_videomode));
kfree(mode);
return m;
}
/**
* fb_destroy_modedb - destroys mode database
* @modedb: mode database to destroy
*
* DESCRIPTION:
* Destroy mode database created by fb_create_modedb
*/
void fb_destroy_modedb(struct fb_videomode *modedb)
{
kfree(modedb);
}
static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
{
int i, retval = 1;
unsigned char *block;
block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
DPRINTK(" Monitor Operating Limits: ");
for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
if (edid_is_limits_block(block)) {
specs->hfmin = H_MIN_RATE * 1000;
specs->hfmax = H_MAX_RATE * 1000;
specs->vfmin = V_MIN_RATE;
specs->vfmax = V_MAX_RATE;
specs->dclkmax = MAX_PIXEL_CLOCK * 1000000;
specs->gtf = (GTF_SUPPORT) ? 1 : 0;
retval = 0;
DPRINTK("From EDID\n");
break;
}
}
/* estimate monitor limits based on modes supported */
if (retval) {
struct fb_videomode *modes;
int num_modes, i, hz, hscan, pixclock;
modes = fb_create_modedb(edid, &num_modes);
if (!modes) {
DPRINTK("None Available\n");
return 1;
}
retval = 0;
for (i = 0; i < num_modes; i++) {
hz = modes[i].refresh;
pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
hscan = (modes[i].yres * 105 * hz + 5000)/100;
if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
specs->dclkmax = pixclock;
if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
specs->dclkmin = pixclock;
if (specs->hfmax == 0 || specs->hfmax < hscan)
specs->hfmax = hscan;
if (specs->hfmin == 0 || specs->hfmin > hscan)
specs->hfmin = hscan;
if (specs->vfmax == 0 || specs->vfmax < hz)
specs->vfmax = hz;
if (specs->vfmin == 0 || specs->vfmin > hz)
specs->vfmin = hz;
}
DPRINTK("Extrapolated\n");
fb_destroy_modedb(modes);
}
DPRINTK(" H: %d-%dKHz V: %d-%dHz DCLK: %dMHz\n",
specs->hfmin/1000, specs->hfmax/1000, specs->vfmin,
specs->vfmax, specs->dclkmax/1000000);
return retval;
}
static void get_monspecs(unsigned char *edid, struct fb_monspecs *specs)
{
unsigned char c, *block;
block = edid + EDID_STRUCT_DISPLAY;
fb_get_monitor_limits(edid, specs);
c = block[0] & 0x80;
specs->input = 0;
if (c) {
specs->input |= FB_DISP_DDI;
DPRINTK(" Digital Display Input");
} else {
DPRINTK(" Analog Display Input: Input Voltage - ");
switch ((block[0] & 0x60) >> 5) {
case 0:
DPRINTK("0.700V/0.300V");
specs->input |= FB_DISP_ANA_700_300;
break;
case 1:
DPRINTK("0.714V/0.286V");
specs->input |= FB_DISP_ANA_714_286;
break;
case 2:
DPRINTK("1.000V/0.400V");
specs->input |= FB_DISP_ANA_1000_400;
break;
case 3:
DPRINTK("0.700V/0.000V");
specs->input |= FB_DISP_ANA_700_000;
break;
}
}
DPRINTK("\n Sync: ");
c = block[0] & 0x10;
if (c)
DPRINTK(" Configurable signal level\n");
c = block[0] & 0x0f;
specs->signal = 0;
if (c & 0x10) {
DPRINTK("Blank to Blank ");
specs->signal |= FB_SIGNAL_BLANK_BLANK;
}
if (c & 0x08) {
DPRINTK("Separate ");
specs->signal |= FB_SIGNAL_SEPARATE;
}
if (c & 0x04) {
DPRINTK("Composite ");
specs->signal |= FB_SIGNAL_COMPOSITE;
}
if (c & 0x02) {
DPRINTK("Sync on Green ");
specs->signal |= FB_SIGNAL_SYNC_ON_GREEN;
}
if (c & 0x01) {
DPRINTK("Serration on ");
specs->signal |= FB_SIGNAL_SERRATION_ON;
}
DPRINTK("\n");
specs->max_x = block[1];
specs->max_y = block[2];
DPRINTK(" Max H-size in cm: ");
if (specs->max_x)
DPRINTK("%d\n", specs->max_x);
else
DPRINTK("variable\n");
DPRINTK(" Max V-size in cm: ");
if (specs->max_y)
DPRINTK("%d\n", specs->max_y);
else
DPRINTK("variable\n");
c = block[3];
specs->gamma = c+100;
DPRINTK(" Gamma: ");
DPRINTK("%d.%d\n", specs->gamma/100, specs->gamma % 100);
get_dpms_capabilities(block[4], specs);
switch ((block[4] & 0x18) >> 3) {
case 0:
DPRINTK(" Monochrome/Grayscale\n");
specs->input |= FB_DISP_MONO;
break;
case 1:
DPRINTK(" RGB Color Display\n");
specs->input |= FB_DISP_RGB;
break;
case 2:
DPRINTK(" Non-RGB Multicolor Display\n");
specs->input |= FB_DISP_MULTI;
break;
default:
DPRINTK(" Unknown\n");
specs->input |= FB_DISP_UNKNOWN;
break;
}
get_chroma(block, specs);
specs->misc = 0;
c = block[4] & 0x7;
if (c & 0x04) {
DPRINTK(" Default color format is primary\n");
specs->misc |= FB_MISC_PRIM_COLOR;
}
if (c & 0x02) {
DPRINTK(" First DETAILED Timing is preferred\n");
specs->misc |= FB_MISC_1ST_DETAIL;
}
if (c & 0x01) {
printk(" Display is GTF capable\n");
specs->gtf = 1;
}
}
static int edid_is_timing_block(unsigned char *block)
{
if ((block[0] != 0x00) || (block[1] != 0x00) ||
(block[2] != 0x00) || (block[4] != 0x00))
return 1;
else
return 0;
}
int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
{
int i;
unsigned char *block;
if (edid == NULL || var == NULL)
return 1;
if (!(edid_checksum(edid)))
return 1;
if (!(edid_check_header(edid)))
return 1;
block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
if (edid_is_timing_block(block)) {
var->xres = var->xres_virtual = H_ACTIVE;
var->yres = var->yres_virtual = V_ACTIVE;
var->height = var->width = -1;
var->right_margin = H_SYNC_OFFSET;
var->left_margin = (H_ACTIVE + H_BLANKING) -
(H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);
var->upper_margin = V_BLANKING - V_SYNC_OFFSET -
V_SYNC_WIDTH;
var->lower_margin = V_SYNC_OFFSET;
var->hsync_len = H_SYNC_WIDTH;
var->vsync_len = V_SYNC_WIDTH;
var->pixclock = PIXEL_CLOCK;
var->pixclock /= 1000;
var->pixclock = KHZ2PICOS(var->pixclock);
if (HSYNC_POSITIVE)
var->sync |= FB_SYNC_HOR_HIGH_ACT;
if (VSYNC_POSITIVE)
var->sync |= FB_SYNC_VERT_HIGH_ACT;
return 0;
}
}
return 1;
}
void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
{
unsigned char *block;
int i, found = 0;
if (edid == NULL)
return;
if (!(edid_checksum(edid)))
return;
if (!(edid_check_header(edid)))
return;
memset(specs, 0, sizeof(struct fb_monspecs));
specs->version = edid[EDID_STRUCT_VERSION];
specs->revision = edid[EDID_STRUCT_REVISION];
DPRINTK("========================================\n");
DPRINTK("Display Information (EDID)\n");
DPRINTK("========================================\n");
DPRINTK(" EDID Version %d.%d\n", (int) specs->version,
(int) specs->revision);
parse_vendor_block(edid + ID_MANUFACTURER_NAME, specs);
block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
if (edid_is_serial_block(block)) {
copy_string(block, specs->serial_no);
DPRINTK(" Serial Number: %s\n", specs->serial_no);
} else if (edid_is_ascii_block(block)) {
copy_string(block, specs->ascii);
DPRINTK(" ASCII Block: %s\n", specs->ascii);
} else if (edid_is_monitor_block(block)) {
copy_string(block, specs->monitor);
DPRINTK(" Monitor Name: %s\n", specs->monitor);
}
}
DPRINTK(" Display Characteristics:\n");
get_monspecs(edid, specs);
specs->modedb = fb_create_modedb(edid, &specs->modedb_len);
/*
* Workaround for buggy EDIDs that sets that the first
* detailed timing is preferred but has not detailed
* timing specified
*/
for (i = 0; i < specs->modedb_len; i++) {
if (specs->modedb[i].flag & FB_MODE_IS_DETAILED) {
found = 1;
break;
}
}
if (!found)
specs->misc &= ~FB_MISC_1ST_DETAIL;
DPRINTK("========================================\n");
}
/*
* VESA Generalized Timing Formula (GTF)
*/
#define FLYBACK 550
#define V_FRONTPORCH 1
#define H_OFFSET 40
#define H_SCALEFACTOR 20
#define H_BLANKSCALE 128
#define H_GRADIENT 600
#define C_VAL 30
#define M_VAL 300
struct __fb_timings {
u32 dclk;
u32 hfreq;
u32 vfreq;
u32 hactive;
u32 vactive;
u32 hblank;
u32 vblank;
u32 htotal;
u32 vtotal;
};
/**
* fb_get_vblank - get vertical blank time
* @hfreq: horizontal freq
*
* DESCRIPTION:
* vblank = right_margin + vsync_len + left_margin
*
* given: right_margin = 1 (V_FRONTPORCH)
* vsync_len = 3
* flyback = 550
*
* flyback * hfreq
* left_margin = --------------- - vsync_len
* 1000000
*/
static u32 fb_get_vblank(u32 hfreq)
{
u32 vblank;
vblank = (hfreq * FLYBACK)/1000;
vblank = (vblank + 500)/1000;
return (vblank + V_FRONTPORCH);
}
/**
* fb_get_hblank_by_freq - get horizontal blank time given hfreq
* @hfreq: horizontal freq
* @xres: horizontal resolution in pixels
*
* DESCRIPTION:
*
* xres * duty_cycle
* hblank = ------------------
* 100 - duty_cycle
*
* duty cycle = percent of htotal assigned to inactive display
* duty cycle = C - (M/Hfreq)
*
* where: C = ((offset - scale factor) * blank_scale)
* -------------------------------------- + scale factor
* 256
* M = blank_scale * gradient
*
*/
static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
{
u32 c_val, m_val, duty_cycle, hblank;
c_val = (((H_OFFSET - H_SCALEFACTOR) * H_BLANKSCALE)/256 +
H_SCALEFACTOR) * 1000;
m_val = (H_BLANKSCALE * H_GRADIENT)/256;
m_val = (m_val * 1000000)/hfreq;
duty_cycle = c_val - m_val;
hblank = (xres * duty_cycle)/(100000 - duty_cycle);
return (hblank);
}
/**
* fb_get_hblank_by_dclk - get horizontal blank time given pixelclock
* @dclk: pixelclock in Hz
* @xres: horizontal resolution in pixels
*
* DESCRIPTION:
*
* xres * duty_cycle
* hblank = ------------------
* 100 - duty_cycle
*
* duty cycle = percent of htotal assigned to inactive display
* duty cycle = C - (M * h_period)
*
* where: h_period = SQRT(100 - C + (0.4 * xres * M)/dclk) + C - 100
* -----------------------------------------------
* 2 * M
* M = 300;
* C = 30;
*/
static u32 fb_get_hblank_by_dclk(u32 dclk, u32 xres)
{
u32 duty_cycle, h_period, hblank;
dclk /= 1000;