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This new function determines how many blocks the EDID has. Traditionally the number of extension blocks is read from the EDID at offset 126, but this can be overridden by the HDMI Forum EDID Extension Override Data Block. So check that as well in this helper. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>