Display Controllers

M series of chips have two kinds of display controllers, dcp and dcpext. Both kinds support

• DP 1.4 (4 lanes) with DSC. No MST!
• HDMI via dp2hdmi converter. See below for routing restrictions.
• USB-C ports: DP altmode, or USB4 tunneling with 2 controllers max per port. See below for routing restrictions.

Controller-specific information:

Type	Mode limits
dcp	5K, 60Hz, 10bpp (Apple-provided information, not tested)
dcpext	6K, 60Hz, 10bpp (Apple-provided information, not tested)

M1 routing restrictions:

Controller	Internal display	HDMI	USB-C
dcp	+	+
dcpext			+

M2 and later routing restrictions:

Controller	Internal display	HDMI	USB-C
dcp	+	+	+
dcpext		+	+

SoC-specific information:

SoC	Number of dcp	Number of dcpext	Notes
M1	1	1
M1 Pro	1	2
M1 Max	1	4
M1 Ultra	1	8	There are no Ultra devices with internal display. dcp is disabled on one of the dies, another dcp is routed to HDMI
M2	1	1
M2 Pro	1	2
M2 Max	1	4
M2 Ultra	0	8	There are no Ultra devices with internal display. dcp on both dies are disabled
M3	1	1
M3 Pro	1	2
M3 Max	1	4
M4	?	?	TBD
M4 Pro	?	?	TBD
M4 Max	?	?	TBD