drm/ast: DisplayPort edid supports 256 bytes

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DisplayPort supports EDID up to 256 bytes (blocks 0 and 1). Update the
block check to allow these two blocks. For any block beyond that
(i.e. the monitor's EDID is larger than the 256 bytes ASPEED DP can
hold), report it as an all-zero block instead of a read failure.

Also remove the manual checksum/extension-count patch of block 0's
last four bytes. That code was already dead, so the condition can never
be true.

Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260819-upstream_ast_dp_edid-v3-1-15d36c28afe2@aspeedtech.com

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Jammy Huang 2026-08-19 13:58:37 +08:00 • committed by Thomas Zimmermann

parent 1ae7fe832c

commit b35be235d9

1 changed files with 8 additions and 16 deletions

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drivers/gpu/drm/ast/ast_dp.c

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