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1520 lines
38 KiB
1520 lines
38 KiB
/* |
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* linux/drivers/video/fbmon.c |
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* |
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* Copyright (C) 2002 James Simmons <[email protected]> |
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* |
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* Credits: |
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* |
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* The EDID Parser is a conglomeration from the following sources: |
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* |
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* 1. SciTech SNAP Graphics Architecture |
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* Copyright (C) 1991-2002 SciTech Software, Inc. All rights reserved. |
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* |
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* 2. XFree86 4.3.0, interpret_edid.c |
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* Copyright 1998 by Egbert Eich <[email protected]> |
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* |
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* 3. John Fremlin <[email protected]> and |
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* Ani Joshi <[email protected]> |
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* |
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* Generalized Timing Formula is derived from: |
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* |
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* GTF Spreadsheet by Andy Morrish (1/5/97) |
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* available at https://www.vesa.org |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file COPYING in the main directory of this archive |
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* for more details. |
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* |
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*/ |
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#include <linux/fb.h> |
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#include <linux/module.h> |
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#include <linux/pci.h> |
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#include <linux/slab.h> |
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#include <video/edid.h> |
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#include <video/of_videomode.h> |
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#include <video/videomode.h> |
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#include "../edid.h" |
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|
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/* |
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* EDID parser |
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*/ |
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|
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#undef DEBUG /* define this for verbose EDID parsing output */ |
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|
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#ifdef DEBUG |
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#define DPRINTK(fmt, args...) printk(fmt,## args) |
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#else |
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#define DPRINTK(fmt, args...) no_printk(fmt, ##args) |
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#endif |
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|
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#define FBMON_FIX_HEADER 1 |
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#define FBMON_FIX_INPUT 2 |
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#define FBMON_FIX_TIMINGS 3 |
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|
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#ifdef CONFIG_FB_MODE_HELPERS |
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struct broken_edid { |
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u8 manufacturer[4]; |
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u32 model; |
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u32 fix; |
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}; |
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|
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static const struct broken_edid brokendb[] = { |
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/* DEC FR-PCXAV-YZ */ |
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{ |
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.manufacturer = "DEC", |
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.model = 0x073a, |
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.fix = FBMON_FIX_HEADER, |
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}, |
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/* ViewSonic PF775a */ |
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{ |
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.manufacturer = "VSC", |
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.model = 0x5a44, |
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.fix = FBMON_FIX_INPUT, |
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}, |
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/* Sharp UXGA? */ |
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{ |
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.manufacturer = "SHP", |
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.model = 0x138e, |
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.fix = FBMON_FIX_TIMINGS, |
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}, |
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}; |
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|
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static const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff, |
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0xff, 0xff, 0xff, 0x00 |
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}; |
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|
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static void copy_string(unsigned char *c, unsigned char *s) |
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{ |
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int i; |
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c = c + 5; |
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for (i = 0; (i < 13 && *c != 0x0A); i++) |
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*(s++) = *(c++); |
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*s = 0; |
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while (i-- && (*--s == 0x20)) *s = 0; |
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} |
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|
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static int edid_is_serial_block(unsigned char *block) |
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{ |
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if ((block[0] == 0x00) && (block[1] == 0x00) && |
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(block[2] == 0x00) && (block[3] == 0xff) && |
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(block[4] == 0x00)) |
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return 1; |
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else |
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return 0; |
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} |
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|
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static int edid_is_ascii_block(unsigned char *block) |
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{ |
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if ((block[0] == 0x00) && (block[1] == 0x00) && |
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(block[2] == 0x00) && (block[3] == 0xfe) && |
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(block[4] == 0x00)) |
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return 1; |
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else |
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return 0; |
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} |
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|
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static int edid_is_limits_block(unsigned char *block) |
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{ |
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if ((block[0] == 0x00) && (block[1] == 0x00) && |
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(block[2] == 0x00) && (block[3] == 0xfd) && |
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(block[4] == 0x00)) |
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return 1; |
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else |
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return 0; |
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} |
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|
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static int edid_is_monitor_block(unsigned char *block) |
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{ |
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if ((block[0] == 0x00) && (block[1] == 0x00) && |
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(block[2] == 0x00) && (block[3] == 0xfc) && |
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(block[4] == 0x00)) |
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return 1; |
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else |
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return 0; |
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} |
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|
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static int edid_is_timing_block(unsigned char *block) |
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{ |
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if ((block[0] != 0x00) || (block[1] != 0x00) || |
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(block[2] != 0x00) || (block[4] != 0x00)) |
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return 1; |
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else |
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return 0; |
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} |
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|
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static int check_edid(unsigned char *edid) |
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{ |
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unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4]; |
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unsigned char *b; |
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u32 model; |
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int i, fix = 0, ret = 0; |
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|
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manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; |
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manufacturer[1] = ((block[0] & 0x03) << 3) + |
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((block[1] & 0xe0) >> 5) + '@'; |
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manufacturer[2] = (block[1] & 0x1f) + '@'; |
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manufacturer[3] = 0; |
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model = block[2] + (block[3] << 8); |
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|
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for (i = 0; i < ARRAY_SIZE(brokendb); i++) { |
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if (!strncmp(manufacturer, brokendb[i].manufacturer, 4) && |
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brokendb[i].model == model) { |
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fix = brokendb[i].fix; |
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break; |
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} |
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} |
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|
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switch (fix) { |
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case FBMON_FIX_HEADER: |
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for (i = 0; i < 8; i++) { |
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if (edid[i] != edid_v1_header[i]) { |
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ret = fix; |
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break; |
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} |
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} |
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break; |
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case FBMON_FIX_INPUT: |
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b = edid + EDID_STRUCT_DISPLAY; |
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/* Only if display is GTF capable will |
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the input type be reset to analog */ |
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if (b[4] & 0x01 && b[0] & 0x80) |
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ret = fix; |
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break; |
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case FBMON_FIX_TIMINGS: |
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b = edid + DETAILED_TIMING_DESCRIPTIONS_START; |
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ret = fix; |
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|
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for (i = 0; i < 4; i++) { |
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if (edid_is_limits_block(b)) { |
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ret = 0; |
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break; |
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} |
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|
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b += DETAILED_TIMING_DESCRIPTION_SIZE; |
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} |
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|
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break; |
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} |
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if (ret) |
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printk("fbmon: The EDID Block of " |
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"Manufacturer: %s Model: 0x%x is known to " |
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"be broken,\n", manufacturer, model); |
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|
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return ret; |
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} |
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|
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static void fix_edid(unsigned char *edid, int fix) |
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{ |
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int i; |
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unsigned char *b, csum = 0; |
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|
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switch (fix) { |
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case FBMON_FIX_HEADER: |
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printk("fbmon: trying a header reconstruct\n"); |
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memcpy(edid, edid_v1_header, 8); |
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break; |
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case FBMON_FIX_INPUT: |
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printk("fbmon: trying to fix input type\n"); |
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b = edid + EDID_STRUCT_DISPLAY; |
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b[0] &= ~0x80; |
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edid[127] += 0x80; |
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break; |
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case FBMON_FIX_TIMINGS: |
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printk("fbmon: trying to fix monitor timings\n"); |
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b = edid + DETAILED_TIMING_DESCRIPTIONS_START; |
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for (i = 0; i < 4; i++) { |
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if (!(edid_is_serial_block(b) || |
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edid_is_ascii_block(b) || |
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edid_is_monitor_block(b) || |
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edid_is_timing_block(b))) { |
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b[0] = 0x00; |
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b[1] = 0x00; |
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b[2] = 0x00; |
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b[3] = 0xfd; |
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b[4] = 0x00; |
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b[5] = 60; /* vfmin */ |
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b[6] = 60; /* vfmax */ |
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b[7] = 30; /* hfmin */ |
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b[8] = 75; /* hfmax */ |
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b[9] = 17; /* pixclock - 170 MHz*/ |
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b[10] = 0; /* GTF */ |
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break; |
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} |
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|
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b += DETAILED_TIMING_DESCRIPTION_SIZE; |
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} |
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|
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for (i = 0; i < EDID_LENGTH - 1; i++) |
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csum += edid[i]; |
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|
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edid[127] = 256 - csum; |
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break; |
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} |
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} |
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|
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static int edid_checksum(unsigned char *edid) |
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{ |
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unsigned char csum = 0, all_null = 0; |
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int i, err = 0, fix = check_edid(edid); |
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|
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if (fix) |
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fix_edid(edid, fix); |
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|
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for (i = 0; i < EDID_LENGTH; i++) { |
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csum += edid[i]; |
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all_null |= edid[i]; |
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} |
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|
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if (csum == 0x00 && all_null) { |
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/* checksum passed, everything's good */ |
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err = 1; |
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} |
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return err; |
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} |
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static int edid_check_header(unsigned char *edid) |
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{ |
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int i, err = 1, fix = check_edid(edid); |
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|
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if (fix) |
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fix_edid(edid, fix); |
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|
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for (i = 0; i < 8; i++) { |
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if (edid[i] != edid_v1_header[i]) |
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err = 0; |
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} |
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|
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return err; |
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} |
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|
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static void parse_vendor_block(unsigned char *block, struct fb_monspecs *specs) |
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{ |
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specs->manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@'; |
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specs->manufacturer[1] = ((block[0] & 0x03) << 3) + |
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((block[1] & 0xe0) >> 5) + '@'; |
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specs->manufacturer[2] = (block[1] & 0x1f) + '@'; |
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specs->manufacturer[3] = 0; |
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specs->model = block[2] + (block[3] << 8); |
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specs->serial = block[4] + (block[5] << 8) + |
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(block[6] << 16) + (block[7] << 24); |
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specs->year = block[9] + 1990; |
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specs->week = block[8]; |
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DPRINTK(" Manufacturer: %s\n", specs->manufacturer); |
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DPRINTK(" Model: %x\n", specs->model); |
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DPRINTK(" Serial#: %u\n", specs->serial); |
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DPRINTK(" Year: %u Week %u\n", specs->year, specs->week); |
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} |
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|
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static void get_dpms_capabilities(unsigned char flags, |
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struct fb_monspecs *specs) |
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{ |
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specs->dpms = 0; |
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if (flags & DPMS_ACTIVE_OFF) |
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specs->dpms |= FB_DPMS_ACTIVE_OFF; |
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if (flags & DPMS_SUSPEND) |
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specs->dpms |= FB_DPMS_SUSPEND; |
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if (flags & DPMS_STANDBY) |
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specs->dpms |= FB_DPMS_STANDBY; |
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DPRINTK(" DPMS: Active %s, Suspend %s, Standby %s\n", |
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(flags & DPMS_ACTIVE_OFF) ? "yes" : "no", |
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(flags & DPMS_SUSPEND) ? "yes" : "no", |
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(flags & DPMS_STANDBY) ? "yes" : "no"); |
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} |
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|
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static void get_chroma(unsigned char *block, struct fb_monspecs *specs) |
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{ |
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int tmp; |
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|
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DPRINTK(" Chroma\n"); |
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/* Chromaticity data */ |
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tmp = ((block[5] & (3 << 6)) >> 6) | (block[0x7] << 2); |
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tmp *= 1000; |
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tmp += 512; |
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specs->chroma.redx = tmp/1024; |
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DPRINTK(" RedX: 0.%03d ", specs->chroma.redx); |
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|
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tmp = ((block[5] & (3 << 4)) >> 4) | (block[0x8] << 2); |
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tmp *= 1000; |
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tmp += 512; |
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specs->chroma.redy = tmp/1024; |
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DPRINTK("RedY: 0.%03d\n", specs->chroma.redy); |
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|
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tmp = ((block[5] & (3 << 2)) >> 2) | (block[0x9] << 2); |
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tmp *= 1000; |
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tmp += 512; |
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specs->chroma.greenx = tmp/1024; |
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DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx); |
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|
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tmp = (block[5] & 3) | (block[0xa] << 2); |
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tmp *= 1000; |
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tmp += 512; |
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specs->chroma.greeny = tmp/1024; |
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DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny); |
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|
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tmp = ((block[6] & (3 << 6)) >> 6) | (block[0xb] << 2); |
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tmp *= 1000; |
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tmp += 512; |
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specs->chroma.bluex = tmp/1024; |
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DPRINTK(" BlueX: 0.%03d ", specs->chroma.bluex); |
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|
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tmp = ((block[6] & (3 << 4)) >> 4) | (block[0xc] << 2); |
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tmp *= 1000; |
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tmp += 512; |
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specs->chroma.bluey = tmp/1024; |
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DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey); |
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|
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tmp = ((block[6] & (3 << 2)) >> 2) | (block[0xd] << 2); |
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tmp *= 1000; |
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tmp += 512; |
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specs->chroma.whitex = tmp/1024; |
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DPRINTK(" WhiteX: 0.%03d ", specs->chroma.whitex); |
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|
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tmp = (block[6] & 3) | (block[0xe] << 2); |
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tmp *= 1000; |
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tmp += 512; |
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specs->chroma.whitey = tmp/1024; |
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DPRINTK("WhiteY: 0.%03d\n", specs->chroma.whitey); |
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} |
|
|
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static void calc_mode_timings(int xres, int yres, int refresh, |
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struct fb_videomode *mode) |
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{ |
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struct fb_var_screeninfo *var; |
|
|
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var = kzalloc(sizeof(struct fb_var_screeninfo), GFP_KERNEL); |
|
|
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if (var) { |
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var->xres = xres; |
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var->yres = yres; |
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fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, |
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refresh, var, NULL); |
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mode->xres = xres; |
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mode->yres = yres; |
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mode->pixclock = var->pixclock; |
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mode->refresh = refresh; |
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mode->left_margin = var->left_margin; |
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mode->right_margin = var->right_margin; |
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mode->upper_margin = var->upper_margin; |
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mode->lower_margin = var->lower_margin; |
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mode->hsync_len = var->hsync_len; |
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mode->vsync_len = var->vsync_len; |
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mode->vmode = 0; |
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mode->sync = 0; |
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kfree(var); |
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} |
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} |
|
|
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static int get_est_timing(unsigned char *block, struct fb_videomode *mode) |
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{ |
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int num = 0; |
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unsigned char c; |
|
|
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c = block[0]; |
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if (c&0x80) { |
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calc_mode_timings(720, 400, 70, &mode[num]); |
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mode[num++].flag = FB_MODE_IS_CALCULATED; |
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DPRINTK(" 720x400@70Hz\n"); |
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} |
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if (c&0x40) { |
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calc_mode_timings(720, 400, 88, &mode[num]); |
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mode[num++].flag = FB_MODE_IS_CALCULATED; |
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DPRINTK(" 720x400@88Hz\n"); |
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} |
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if (c&0x20) { |
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mode[num++] = vesa_modes[3]; |
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DPRINTK(" 640x480@60Hz\n"); |
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} |
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if (c&0x10) { |
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calc_mode_timings(640, 480, 67, &mode[num]); |
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mode[num++].flag = FB_MODE_IS_CALCULATED; |
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DPRINTK(" 640x480@67Hz\n"); |
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} |
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if (c&0x08) { |
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mode[num++] = vesa_modes[4]; |
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DPRINTK(" 640x480@72Hz\n"); |
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} |
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if (c&0x04) { |
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mode[num++] = vesa_modes[5]; |
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DPRINTK(" 640x480@75Hz\n"); |
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} |
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if (c&0x02) { |
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mode[num++] = vesa_modes[7]; |
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DPRINTK(" 800x600@56Hz\n"); |
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} |
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if (c&0x01) { |
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mode[num++] = vesa_modes[8]; |
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DPRINTK(" 800x600@60Hz\n"); |
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} |
|
|
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c = block[1]; |
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if (c&0x80) { |
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mode[num++] = vesa_modes[9]; |
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DPRINTK(" 800x600@72Hz\n"); |
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} |
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if (c&0x40) { |
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mode[num++] = vesa_modes[10]; |
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DPRINTK(" 800x600@75Hz\n"); |
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} |
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if (c&0x20) { |
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calc_mode_timings(832, 624, 75, &mode[num]); |
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mode[num++].flag = FB_MODE_IS_CALCULATED; |
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DPRINTK(" 832x624@75Hz\n"); |
|
} |
|
if (c&0x10) { |
|
mode[num++] = vesa_modes[12]; |
|
DPRINTK(" 1024x768@87Hz Interlaced\n"); |
|
} |
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if (c&0x08) { |
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mode[num++] = vesa_modes[13]; |
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DPRINTK(" 1024x768@60Hz\n"); |
|
} |
|
if (c&0x04) { |
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mode[num++] = vesa_modes[14]; |
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DPRINTK(" 1024x768@70Hz\n"); |
|
} |
|
if (c&0x02) { |
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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]; |
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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 ver, int rev, const struct fb_monspecs *specs) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < DMT_SIZE; i++) { |
|
u32 std_2byte_code = block[0] << 8 | block[1]; |
|
if (std_2byte_code == dmt_modes[i].std_2byte_code) |
|
break; |
|
} |
|
|
|
if (i < DMT_SIZE && dmt_modes[i].mode) { |
|
/* DMT mode found */ |
|
*mode = *dmt_modes[i].mode; |
|
mode->flag |= FB_MODE_IS_STANDARD; |
|
DPRINTK(" DMT id=%d\n", dmt_modes[i].dmt_id); |
|
|
|
} else { |
|
int xres, yres = 0, refresh, ratio; |
|
|
|
xres = (block[0] + 31) * 8; |
|
if (xres <= 256) |
|
return 0; |
|
|
|
ratio = (block[1] & 0xc0) >> 6; |
|
switch (ratio) { |
|
case 0: |
|
/* in EDID 1.3 the meaning of 0 changed to 16:10 (prior 1:1) */ |
|
if (ver < 1 || (ver == 1 && rev < 3)) |
|
yres = xres; |
|
else |
|
yres = (xres * 10)/16; |
|
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); |
|
|
|
calc_mode_timings(xres, yres, refresh, mode); |
|
} |
|
|
|
/* Check the mode we got is within valid spec of the monitor */ |
|
if (specs && specs->dclkmax |
|
&& PICOS2KHZ(mode->pixclock) * 1000 > specs->dclkmax) { |
|
DPRINTK(" mode exceed max DCLK\n"); |
|
return 0; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
static int get_dst_timing(unsigned char *block, struct fb_videomode *mode, |
|
int ver, int rev, const struct fb_monspecs *specs) |
|
{ |
|
int j, num = 0; |
|
|
|
for (j = 0; j < 6; j++, block += STD_TIMING_DESCRIPTION_SIZE) |
|
num += get_std_timing(block, &mode[num], ver, rev, specs); |
|
|
|
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 |
|
* @specs: monitor specifications, may be NULL |
|
* |
|
* 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, |
|
const struct fb_monspecs *specs) |
|
{ |
|
struct fb_videomode *mode, *m; |
|
unsigned char *block; |
|
int num = 0, i, first = 1; |
|
int ver, rev; |
|
|
|
mode = kcalloc(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; |
|
} |
|
|
|
ver = edid[EDID_STRUCT_VERSION]; |
|
rev = edid[EDID_STRUCT_REVISION]; |
|
|
|
*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], ver, rev, specs); |
|
|
|
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], |
|
ver, rev, specs); |
|
} |
|
|
|
/* Yikes, EDID data is totally useless */ |
|
if (!num) { |
|
kfree(mode); |
|
return NULL; |
|
} |
|
|
|
*dbsize = num; |
|
m = kmalloc_array(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, specs); |
|
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, specs); |
|
if (!specs->modedb) |
|
return; |
|
|
|
/* |
|
* 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 (https://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; |
|
} |
|
|
|
#ifdef CONFIG_VIDEOMODE_HELPERS |
|
int fb_videomode_from_videomode(const struct videomode *vm, |
|
struct fb_videomode *fbmode) |
|
{ |
|
unsigned int htotal, vtotal; |
|
|
|
fbmode->xres = vm->hactive; |
|
fbmode->left_margin = vm->hback_porch; |
|
fbmode->right_margin = vm->hfront_porch; |
|
fbmode->hsync_len = vm->hsync_len; |
|
|
|
fbmode->yres = vm->vactive; |
|
fbmode->upper_margin = vm->vback_porch; |
|
fbmode->lower_margin = vm->vfront_porch; |
|
fbmode->vsync_len = vm->vsync_len; |
|
|
|
/* prevent division by zero in KHZ2PICOS macro */ |
|
fbmode->pixclock = vm->pixelclock ? |
|
KHZ2PICOS(vm->pixelclock / 1000) : 0; |
|
|
|
fbmode->sync = 0; |
|
fbmode->vmode = 0; |
|
if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH) |
|
fbmode->sync |= FB_SYNC_HOR_HIGH_ACT; |
|
if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH) |
|
fbmode->sync |= FB_SYNC_VERT_HIGH_ACT; |
|
if (vm->flags & DISPLAY_FLAGS_INTERLACED) |
|
fbmode->vmode |= FB_VMODE_INTERLACED; |
|
if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN) |
|
fbmode->vmode |= FB_VMODE_DOUBLE; |
|
fbmode->flag = 0; |
|
|
|
htotal = vm->hactive + vm->hfront_porch + vm->hback_porch + |
|
vm->hsync_len; |
|
vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch + |
|
vm->vsync_len; |
|
/* prevent division by zero */ |
|
if (htotal && vtotal) { |
|
fbmode->refresh = vm->pixelclock / (htotal * vtotal); |
|
/* a mode must have htotal and vtotal != 0 or it is invalid */ |
|
} else { |
|
fbmode->refresh = 0; |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(fb_videomode_from_videomode); |
|
|
|
#ifdef CONFIG_OF |
|
static inline void dump_fb_videomode(const struct fb_videomode *m) |
|
{ |
|
pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n", |
|
m->xres, m->yres, m->refresh, m->pixclock, m->left_margin, |
|
m->right_margin, m->upper_margin, m->lower_margin, |
|
m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag); |
|
} |
|
|
|
/** |
|
* of_get_fb_videomode - get a fb_videomode from devicetree |
|
* @np: device_node with the timing specification |
|
* @fb: will be set to the return value |
|
* @index: index into the list of display timings in devicetree |
|
* |
|
* DESCRIPTION: |
|
* This function is expensive and should only be used, if only one mode is to be |
|
* read from DT. To get multiple modes start with of_get_display_timings ond |
|
* work with that instead. |
|
*/ |
|
int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb, |
|
int index) |
|
{ |
|
struct videomode vm; |
|
int ret; |
|
|
|
ret = of_get_videomode(np, &vm, index); |
|
if (ret) |
|
return ret; |
|
|
|
ret = fb_videomode_from_videomode(&vm, fb); |
|
if (ret) |
|
return ret; |
|
|
|
pr_debug("%pOF: got %dx%d display mode\n", |
|
np, vm.hactive, vm.vactive); |
|
dump_fb_videomode(fb); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(of_get_fb_videomode); |
|
#endif /* CONFIG_OF */ |
|
#endif /* CONFIG_VIDEOMODE_HELPERS */ |
|
|
|
#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) |
|
{ |
|
} |
|
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);
|
|
|