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edid: Add an edid_check_checksum() helper function

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Add a helper function to check the checksum of an EDID data block.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Hans de Goede 2014-11-24 13:47:13 +01:00
parent b7ce12ddd7
commit e745d064b4
2 changed files with 21 additions and 0 deletions
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12
common/edid.c
View File

@ -12,6 +12,7 @@
#include <common.h>
#include <edid.h>
#include <errno.h>
#include <linux/ctype.h>
#include <linux/string.h>
@ -29,6 +30,17 @@ int edid_check_info(struct edid1_info *edid_info)
return 0;
}
int edid_check_checksum(u8 *edid_block)
{
u8 checksum = 0;
int i;
for (i = 0; i < 128; i++)
checksum += edid_block[i];
return (checksum == 0) ? 0 : -EINVAL;
}
int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
unsigned int *hmax, unsigned int *vmin,
unsigned int *vmax)

9
include/edid.h
View File

@ -245,6 +245,15 @@ void edid_print_info(struct edid1_info *edid_info);
*/
int edid_check_info(struct edid1_info *info);
/**
* Check checksum of a 128 bytes EDID data block
*
* @param edid_block EDID block data
*
* @return 0 on success, or a negative errno on error
*/
int edid_check_checksum(u8 *edid_block);
/**
* Get the horizontal and vertical rate ranges of the monitor.
*