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edid: Add I2C command for printing the EDID

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Add a single command to read the EDID information over I2C.

For example:

SMDK5250 # i2c dev 7
Setting bus to 7
SMDK5250 # i2c edid 50
EDID version: 1.4
Product ID code: 305c
Manufacturer: AUO
Serial number: 00000000
Manufactured in week: 0 year: 2011
Video input definition: digital signal, voltage level 0, blank to black
Monitor is non-RGB
Maximum visible display size: 26 cm x 14 cm
Power management features: no active off, no suspend, no standby
Estabilished timings:
Standard timings:
        1366x768        60 Hz (detailed)
        1366x768        60 Hz (detailed)
Monitor ID: 2VD2K.B116XW

Signed-off-by: Tom Wai-Hong Tam <waihong@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Tom Wai-Hong Tam 2012-12-05 14:46:40 +00:00 committed by Tom Rini
parent d46b5f7dcb
commit 735987c5a8
2 changed files with 44 additions and 0 deletions
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5
README
View file

@ -1488,6 +1488,11 @@ CBFS (Coreboot Filesystem) support
Support drawing of RLE8-compressed bitmaps on the LCD.
CONFIG_I2C_EDID
Enables an 'i2c edid' command which can read EDID
information over I2C from an attached LCD display.
- Splash Screen Support: CONFIG_SPLASH_SCREEN

39
common/cmd_i2c.c
View file

@ -78,6 +78,7 @@
#include <common.h>
#include <command.h>
#include <edid.h>
#include <environment.h>
#include <i2c.h>
#include <malloc.h>
@ -1340,6 +1341,38 @@ static int do_sdram (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
}
#endif
/*
* Syntax:
* i2c edid {i2c_chip}
*/
#if defined(CONFIG_I2C_EDID)
int do_edid(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
u_char chip;
struct edid1_info edid;
if (argc < 2) {
cmd_usage(cmdtp);
return 1;
}
chip = simple_strtoul(argv[1], NULL, 16);
if (i2c_read(chip, 0, 1, (uchar *)&edid, sizeof(edid)) != 0) {
puts("Error reading EDID content.\n");
return 1;
}
if (edid_check_info(&edid)) {
puts("Content isn't valid EDID.\n");
return 1;
}
edid_print_info(&edid);
return 0;
}
#endif /* CONFIG_I2C_EDID */
#if defined(CONFIG_I2C_MUX)
/**
* do_i2c_add_bus() - Handle the "i2c bus" command-line command
@ -1487,6 +1520,9 @@ static cmd_tbl_t cmd_i2c_sub[] = {
#if defined(CONFIG_I2C_MULTI_BUS)
U_BOOT_CMD_MKENT(dev, 1, 1, do_i2c_bus_num, "", ""),
#endif /* CONFIG_I2C_MULTI_BUS */
#if defined(CONFIG_I2C_EDID)
U_BOOT_CMD_MKENT(edid, 1, 1, do_edid, "", ""),
#endif /* CONFIG_I2C_EDID */
U_BOOT_CMD_MKENT(loop, 3, 1, do_i2c_loop, "", ""),
U_BOOT_CMD_MKENT(md, 3, 1, do_i2c_md, "", ""),
U_BOOT_CMD_MKENT(mm, 2, 1, do_i2c_mm, "", ""),
@ -1547,6 +1583,9 @@ static char i2c_help_text[] =
#if defined(CONFIG_I2C_MULTI_BUS)
"i2c dev [dev] - show or set current I2C bus\n"
#endif /* CONFIG_I2C_MULTI_BUS */
#if defined(CONFIG_I2C_EDID)
"i2c edid chip - print EDID configuration information\n"
#endif /* CONFIG_I2C_EDID */
"i2c loop chip address[.0, .1, .2] [# of objects] - looping read of device\n"
"i2c md chip address[.0, .1, .2] [# of objects] - read from I2C device\n"
"i2c mm chip address[.0, .1, .2] - write to I2C device (auto-incrementing)\n"