diff options
| author | Won Chung <wonchung@google.com> | 2023-07-27 20:10:25 +0000 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2023-08-03 12:54:31 +0000 |
| commit | bc1533e08975b285e589447f329ef25bfe585ef9 (patch) | |
| tree | a620e006be9ba7a13cc1cb0c18c566d45655051f /src/mainboard/google/rex/variants/rex0/overridetree.cb | |
| parent | f232b19e56e21415f403826bf6cdb643f214e0f4 (diff) | |
mb/google: Add more comment on GFX devices for the future reference
Add more details to instruct future boards/models implementers regarding
how GFX devices should be added.
If HDMI and DP connectors are enumerated by the kernel in
/sys/class/drm/ then corresponding GFX device should be added to ACPI.
It is possible that some connectors do not have dedicated ports, but
still enumerated.
The order of GFX devices is DDIA -> DDIB -> TCPX.
BUG=b:277629750
TEST=emerge-brya coreboot
Change-Id: I59e82ee954a7d502e419046c1c2d7a20ea8a9224
Signed-off-by: Won Chung <wonchung@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76776
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>
Diffstat (limited to 'src/mainboard/google/rex/variants/rex0/overridetree.cb')
| -rw-r--r-- | src/mainboard/google/rex/variants/rex0/overridetree.cb | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/mainboard/google/rex/variants/rex0/overridetree.cb b/src/mainboard/google/rex/variants/rex0/overridetree.cb index 793a46d7c5..0cbea7b052 100644 --- a/src/mainboard/google/rex/variants/rex0/overridetree.cb +++ b/src/mainboard/google/rex/variants/rex0/overridetree.cb @@ -154,18 +154,19 @@ chip soc/intel/meteorlake # DDIA for eDP register "device[0].name" = ""LCD"" # DDIB for HDMI + # If HDMI is not enumerated in the kernel, then no GFX device should be added for DDIB register "device[1].name" = ""DD01"" # TCP0 (DP-1) for port C0 register "device[2].name" = ""DD02"" register "device[2].use_pld" = "true" register "device[2].pld" = "ACPI_PLD_TYPE_C(LEFT, LEFT, ACPI_PLD_GROUP(1, 1))" - # TCP1 (DP-2) unused + # TCP1 (DP-2) is unused for any ports but still enumerated in the kernel, so GFX device is added for TCP1 register "device[3].name" = ""DD03"" # TCP2 (DP-3) for port C1 register "device[4].name" = ""DD04"" register "device[4].use_pld" = "true" register "device[4].pld" = "ACPI_PLD_TYPE_C(RIGHT, LEFT, ACPI_PLD_GROUP(2, 1))" - # TCP3 (DP-4) unused + # TCP3 (DP-4) is unused for any ports but still enumerated in the kernel, so GFX device is added for TCP3 register "device[5].name" = ""DD05"" device generic 0 on end end |