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edid: Add an edid_check_checksum() helper function
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>
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@ -12,6 +12,7 @@
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#include <common.h>
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#include <common.h>
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#include <edid.h>
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#include <edid.h>
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#include <errno.h>
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#include <linux/ctype.h>
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#include <linux/ctype.h>
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#include <linux/string.h>
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#include <linux/string.h>
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@ -29,6 +30,17 @@ int edid_check_info(struct edid1_info *edid_info)
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return 0;
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return 0;
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}
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}
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int edid_check_checksum(u8 *edid_block)
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{
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u8 checksum = 0;
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int i;
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for (i = 0; i < 128; i++)
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checksum += edid_block[i];
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return (checksum == 0) ? 0 : -EINVAL;
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}
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int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
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int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
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unsigned int *hmax, unsigned int *vmin,
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unsigned int *hmax, unsigned int *vmin,
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unsigned int *vmax)
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unsigned int *vmax)
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@ -245,6 +245,15 @@ void edid_print_info(struct edid1_info *edid_info);
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*/
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*/
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int edid_check_info(struct edid1_info *info);
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int edid_check_info(struct edid1_info *info);
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/**
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* Check checksum of a 128 bytes EDID data block
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*
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* @param edid_block EDID block data
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*
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* @return 0 on success, or a negative errno on error
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*/
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int edid_check_checksum(u8 *edid_block);
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/**
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/**
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* Get the horizontal and vertical rate ranges of the monitor.
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* Get the horizontal and vertical rate ranges of the monitor.
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*
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*
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