| /* |
| * 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/tty.h> |
| #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 |
| |
| #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; |
| |
| 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)); |
| 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 = 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) { |
| 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, *mode; |
| int num_modes, i, 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; |
| } |
| } |
| |
| 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; |
| 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_FB_FIRMWARE_EDID) && defined(__i386__) |
| |
| /* |
| * 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); |