Revision 475049809977bf3975d78f2d2fd992e19ce2d59e authored by Roel Kluin on 10 March 2009, 19:55:45 UTC, committed by Linus Torvalds on 10 March 2009, 22:55:10 UTC
get_nid_for_pfn() returns int
Presumably the (nid < 0) case has never happened.
We do know that it is happening on one system while creating a symlink for
a memory section so it should also happen on the same system if
unregister_mem_sect_under_nodes() were called to remove the same symlink.
The test was actually added in response to a problem with an earlier
version reported by Yasunori Goto where one or more of the leading pages
of a memory section on the 2nd node of one of his systems was
uninitialized because I believe they coincided with a memory hole.
That earlier version did not ignore uninitialized pages and determined
the nid by considering only the 1st page of each memory section. This
caused the symlink to the 1st memory section on the 2nd node to be
incorrectly created in /sys/devices/system/node/node0 instead of
/sys/devices/system/node/node1. The problem was fixed by adding the
test to skip over uninitialized pages.
I suspect we have not seen any reports of the non-removal
of a symlink due to the incorrect declaration of the nid
variable in unregister_mem_sect_under_nodes() because
- systems where a memory section could have an uninitialized
range of leading pages are probably rare.
- memory remove is probably not done very frequently on the
systems that are capable of demonstrating the problem.
- lingering symlink(s) that should have been removed may
have simply gone unnoticed.
[garyhade@us.ibm.com: wrote changelog]
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Gary Hade <garyhade@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 1abaf33
fbmon.c
/*
* linux/drivers/video/fbmon.c
*
* Copyright (C) 2002 James Simmons <jsimmons@users.sf.net>
*
* 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 <Egbert.Eich@Physik.TU-Darmstadt.DE>
*
* 3. John Fremlin <vii@users.sourceforge.net> and
* Ani Joshi <ajoshi@unixbox.com>
*
* 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/fb.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <video/edid.h>
#ifdef CONFIG_PPC_OF
#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
#define FBMON_FIX_TIMINGS 3
#ifdef CONFIG_FB_MODE_HELPERS
struct broken_edid {
u8 manufacturer[4];
u32 model;
u32 fix;
};
static const 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,
},
/* Sharp UXGA? */
{
.manufacturer = "SHP",
.model = 0x138e,
.fix = FBMON_FIX_TIMINGS,
},
};
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 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 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;
}
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) {
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;
}
}
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;
case FBMON_FIX_TIMINGS:
b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
ret = fix;
for (i = 0; i < 4; i++) {
if (edid_is_limits_block(b)) {
ret = 0;
break;
}
b += DETAILED_TIMING_DESCRIPTION_SIZE;
}
break;
}
if (ret)
printk("fbmon: The EDID Block of "
"Manufacturer: %s Model: 0x%x is known to "
"be broken,\n", manufacturer, model);
return ret;
}
static void fix_edid(unsigned char *edid, int fix)
{
int i;
unsigned char *b, csum = 0;
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;
break;
case FBMON_FIX_TIMINGS:
printk("fbmon: trying to fix monitor timings\n");
b = edid + DETAILED_TIMING_DESCRIPTIONS_START;
for (i = 0; i < 4; i++) {
if (!(edid_is_serial_block(b) ||
edid_is_ascii_block(b) ||
edid_is_monitor_block(b) ||
edid_is_timing_block(b))) {
b[0] = 0x00;
b[1] = 0x00;
b[2] = 0x00;
b[3] = 0xfd;
b[4] = 0x00;
b[5] = 60; /* vfmin */
b[6] = 60; /* vfmax */
b[7] = 30; /* hfmin */
b[8] = 75; /* hfmax */
b[9] = 17; /* pixclock - 170 MHz*/
b[10] = 0; /* GTF */
break;
}
b += DETAILED_TIMING_DESCRIPTION_SIZE;
}
for (i = 0; i < EDID_LENGTH - 1; i++)
csum += edid[i];
edid[127] = 256 - csum;
break;
}
}
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 void calc_mode_timings(int xres, int yres, int refresh,
struct fb_videomode *mode)
{
struct fb_var_screeninfo *var;
var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL);
if (var) {
var->xres = xres;
var->yres = yres;
fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON,
refresh, var, NULL);
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;
kfree(var);
}
}
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));
if (INTERLACED) {
mode->yres *= 2;
mode->upper_margin *= 2;
mode->lower_margin *= 2;
mode->vsync_len *= 2;
mode->vmode |= FB_VMODE_INTERLACED;
}
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, first = 1;
mode = kzalloc(50 * sizeof(struct fb_videomode), GFP_KERNEL);
if (mode == NULL)
return NULL;
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) {
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, *mode;
int num_modes, hz, hscan, pixclock;
int vtotal, htotal;
modes = fb_create_modedb(edid, &num_modes);
if (!modes) {
DPRINTK("None Available\n");
return 1;
}
retval = 0;
for (i = 0; i < num_modes; i++) {
mode = &modes[i];
pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
htotal = mode->xres + mode->right_margin + mode->hsync_len
+ mode->left_margin;
vtotal = mode->yres + mode->lower_margin + mode->vsync_len
+ mode->upper_margin;
if (mode->vmode & FB_VMODE_INTERLACED)
vtotal /= 2;
if (mode->vmode & FB_VMODE_DOUBLE)
vtotal *= 2;
hscan = (pixclock + htotal / 2) / htotal;
hscan = (hscan + 500) / 1000 * 1000;
hz = (hscan + vtotal / 2) / vtotal;
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;
}
}
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 = 0;
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;
h_period = 100 - C_VAL;
h_period *= h_period;
h_period += (M_VAL * xres * 2 * 1000)/(5 * dclk);
h_period *= 10000;
h_period = int_sqrt(h_period);
h_period -= (100 - C_VAL) * 100;
h_period *= 1000;
h_period /= 2 * M_VAL;
duty_cycle = C_VAL * 1000 - (M_VAL * h_period)/100;
hblank = (xres * duty_cycle)/(100000 - duty_cycle) + 8;
hblank &= ~15;
return (hblank);
}
/**
* fb_get_hfreq - estimate hsync
* @vfreq: vertical refresh rate
* @yres: vertical resolution
*
* DESCRIPTION:
*
* (yres + front_port) * vfreq * 1000000
* hfreq = -------------------------------------
* (1000000 - (vfreq * FLYBACK)
*
*/
static u32 fb_get_hfreq(u32 vfreq, u32 yres)
{
u32 divisor, hfreq;
divisor = (1000000 - (vfreq * FLYBACK))/1000;
hfreq = (yres + V_FRONTPORCH) * vfreq * 1000;
return (hfreq/divisor);
}
static void fb_timings_vfreq(struct __fb_timings *timings)
{
timings->hfreq = fb_get_hfreq(timings->vfreq, timings->vactive);
timings->vblank = fb_get_vblank(timings->hfreq);
timings->vtotal = timings->vactive + timings->vblank;
timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
timings->hactive);
timings->htotal = timings->hactive + timings->hblank;
timings->dclk = timings->htotal * timings->hfreq;
}
static void fb_timings_hfreq(struct __fb_timings *timings)
{
timings->vblank = fb_get_vblank(timings->hfreq);
timings->vtotal = timings->vactive + timings->vblank;
timings->vfreq = timings->hfreq/timings->vtotal;
timings->hblank = fb_get_hblank_by_hfreq(timings->hfreq,
timings->hactive);
timings->htotal = timings->hactive + timings->hblank;
timings->dclk = timings->htotal * timings->hfreq;
}
static void fb_timings_dclk(struct __fb_timings *timings)
{
timings->hblank = fb_get_hblank_by_dclk(timings->dclk,
timings->hactive);
timings->htotal = timings->hactive + timings->hblank;
timings->hfreq = timings->dclk/timings->htotal;
timings->vblank = fb_get_vblank(timings->hfreq);
timings->vtotal = timings->vactive + timings->vblank;
timings->vfreq = timings->hfreq/timings->vtotal;
}
/*
* fb_get_mode - calculates video mode using VESA GTF
* @flags: if: 0 - maximize vertical refresh rate
* 1 - vrefresh-driven calculation;
* 2 - hscan-driven calculation;
* 3 - pixelclock-driven calculation;
* @val: depending on @flags, ignored, vrefresh, hsync or pixelclock
* @var: pointer to fb_var_screeninfo
* @info: pointer to fb_info
*
* DESCRIPTION:
* Calculates video mode based on monitor specs using VESA GTF.
* The GTF is best for VESA GTF compliant monitors but is
* specifically formulated to work for older monitors as well.
*
* If @flag==0, the function will attempt to maximize the
* refresh rate. Otherwise, it will calculate timings based on
* the flag and accompanying value.
*
* If FB_IGNOREMON bit is set in @flags, monitor specs will be
* ignored and @var will be filled with the calculated timings.
*
* All calculations are based on the VESA GTF Spreadsheet
* available at VESA's public ftp (http://www.vesa.org).
*
* NOTES:
* The timings generated by the GTF will be different from VESA
* DMT. It might be a good idea to keep a table of standard
* VESA modes as well. The GTF may also not work for some displays,
* such as, and especially, analog TV.
*
* REQUIRES:
* A valid info->monspecs, otherwise 'safe numbers' will be used.
*/
int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_info *info)
{
struct __fb_timings *timings;
u32 interlace = 1, dscan = 1;
u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax, err = 0;
timings = kzalloc(sizeof(struct __fb_timings), GFP_KERNEL);
if (!timings)
return -ENOMEM;
/*
* If monspecs are invalid, use values that are enough
* for 640x480@60
*/
if (!info || !info->monspecs.hfmax || !info->monspecs.vfmax ||
!info->monspecs.dclkmax ||
info->monspecs.hfmax < info->monspecs.hfmin ||
info->monspecs.vfmax < info->monspecs.vfmin ||
info->monspecs.dclkmax < info->monspecs.dclkmin) {
hfmin = 29000; hfmax = 30000;
vfmin = 60; vfmax = 60;
dclkmin = 0; dclkmax = 25000000;
} else {
hfmin = info->monspecs.hfmin;
hfmax = info->monspecs.hfmax;
vfmin = info->monspecs.vfmin;
vfmax = info->monspecs.vfmax;
dclkmin = info->monspecs.dclkmin;
dclkmax = info->monspecs.dclkmax;
}
timings->hactive = var->xres;
timings->vactive = var->yres;
if (var->vmode & FB_VMODE_INTERLACED) {
timings->vactive /= 2;
interlace = 2;
}
if (var->vmode & FB_VMODE_DOUBLE) {
timings->vactive *= 2;
dscan = 2;
}
switch (flags & ~FB_IGNOREMON) {
case FB_MAXTIMINGS: /* maximize refresh rate */
timings->hfreq = hfmax;
fb_timings_hfreq(timings);
if (timings->vfreq > vfmax) {
timings->vfreq = vfmax;
fb_timings_vfreq(timings);
}
if (timings->dclk > dclkmax) {
timings->dclk = dclkmax;
fb_timings_dclk(timings);
}
break;
case FB_VSYNCTIMINGS: /* vrefresh driven */
timings->vfreq = val;
fb_timings_vfreq(timings);
break;
case FB_HSYNCTIMINGS: /* hsync driven */
timings->hfreq = val;
fb_timings_hfreq(timings);
break;
case FB_DCLKTIMINGS: /* pixelclock driven */
timings->dclk = PICOS2KHZ(val) * 1000;
fb_timings_dclk(timings);
break;
default:
err = -EINVAL;
}
if (err || (!(flags & FB_IGNOREMON) &&
(timings->vfreq < vfmin || timings->vfreq > vfmax ||
timings->hfreq < hfmin || timings->hfreq > hfmax ||
timings->dclk < dclkmin || timings->dclk > dclkmax))) {
err = -EINVAL;
} else {
var->pixclock = KHZ2PICOS(timings->dclk/1000);
var->hsync_len = (timings->htotal * 8)/100;
var->right_margin = (timings->hblank/2) - var->hsync_len;
var->left_margin = timings->hblank - var->right_margin -
var->hsync_len;
var->vsync_len = (3 * interlace)/dscan;
var->lower_margin = (1 * interlace)/dscan;
var->upper_margin = (timings->vblank * interlace)/dscan -
(var->vsync_len + var->lower_margin);
}
kfree(timings);
return err;
}
#else
int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
{
return 1;
}
void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
{
specs = NULL;
}
void fb_destroy_modedb(struct fb_videomode *modedb)
{
}
int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
struct fb_info *info)
{
return -EINVAL;
}
#endif /* CONFIG_FB_MODE_HELPERS */
/*
* fb_validate_mode - validates var against monitor capabilities
* @var: pointer to fb_var_screeninfo
* @info: pointer to fb_info
*
* DESCRIPTION:
* Validates video mode against monitor capabilities specified in
* info->monspecs.
*
* REQUIRES:
* A valid info->monspecs.
*/
int fb_validate_mode(const struct fb_var_screeninfo *var, struct fb_info *info)
{
u32 hfreq, vfreq, htotal, vtotal, pixclock;
u32 hfmin, hfmax, vfmin, vfmax, dclkmin, dclkmax;
/*
* If monspecs are invalid, use values that are enough
* for 640x480@60
*/
if (!info->monspecs.hfmax || !info->monspecs.vfmax ||
!info->monspecs.dclkmax ||
info->monspecs.hfmax < info->monspecs.hfmin ||
info->monspecs.vfmax < info->monspecs.vfmin ||
info->monspecs.dclkmax < info->monspecs.dclkmin) {
hfmin = 29000; hfmax = 30000;
vfmin = 60; vfmax = 60;
dclkmin = 0; dclkmax = 25000000;
} else {
hfmin = info->monspecs.hfmin;
hfmax = info->monspecs.hfmax;
vfmin = info->monspecs.vfmin;
vfmax = info->monspecs.vfmax;
dclkmin = info->monspecs.dclkmin;
dclkmax = info->monspecs.dclkmax;
}
if (!var->pixclock)
return -EINVAL;
pixclock = PICOS2KHZ(var->pixclock) * 1000;
htotal = var->xres + var->right_margin + var->hsync_len +
var->left_margin;
vtotal = var->yres + var->lower_margin + var->vsync_len +
var->upper_margin;
if (var->vmode & FB_VMODE_INTERLACED)
vtotal /= 2;
if (var->vmode & FB_VMODE_DOUBLE)
vtotal *= 2;
hfreq = pixclock/htotal;
hfreq = (hfreq + 500) / 1000 * 1000;
vfreq = hfreq/vtotal;
return (vfreq < vfmin || vfreq > vfmax ||
hfreq < hfmin || hfreq > hfmax ||
pixclock < dclkmin || pixclock > dclkmax) ?
-EINVAL : 0;
}
#if defined(CONFIG_FIRMWARE_EDID) && defined(CONFIG_X86)
/*
* We need to ensure that the EDID block is only returned for
* the primary graphics adapter.
*/
const unsigned char *fb_firmware_edid(struct device *device)
{
struct pci_dev *dev = NULL;
struct resource *res = NULL;
unsigned char *edid = NULL;
if (device)
dev = to_pci_dev(device);
if (dev)
res = &dev->resource[PCI_ROM_RESOURCE];
if (res && res->flags & IORESOURCE_ROM_SHADOW)
edid = edid_info.dummy;
return edid;
}
#else
const unsigned char *fb_firmware_edid(struct device *device)
{
return NULL;
}
#endif
EXPORT_SYMBOL(fb_firmware_edid);
EXPORT_SYMBOL(fb_parse_edid);
EXPORT_SYMBOL(fb_edid_to_monspecs);
EXPORT_SYMBOL(fb_get_mode);
EXPORT_SYMBOL(fb_validate_mode);
EXPORT_SYMBOL(fb_destroy_modedb);
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