link enable:
	register: 0x28
	toggle bit 8 (&= 128)

hdcp:
	pid enable:
		write 0x4100 0x50
		wait 16ms
		write 0x4100 0x70
	pid disable:
		write 0x4100 0x50
		wait 100ms
		write 0x4100 0x40
	cid enable:
		if daisychained:
			# second i2c stream
			write 0x4116 0x01
		else:
			# first i2c stream
			write 0x4116 0x00
		write 0x4110 0x90
		write 0x4110 0xB0
	cid disable:
		write 0x4110 0x90
		write 0x4110 0x80

daisychained = [0x002A] & 0xC0