[M] Change in coreboot[master]: soc/amd/*: Fix UART ACPI device status

[Matt DeVillier (Code Review)]

Attention is currently required from: Felix Held, Fred Reitberger, Jason Glenesk, Karthik Ramasubramanian, Raul Rangel.

Hello Felix Held, Fred Reitberger, Jason Glenesk, Karthik Ramasubramanian, Raul Rangel, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/77092?usp=email

to look at the new patch set (#4).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: soc/amd/*: Fix UART ACPI device status
......................................................................

soc/amd/*: Fix UART ACPI device status

Prior to commit d1c0f958d198 ("acpi: Call acpi_fill_ssdt() only for
enabled devices"), uart_inject_ssdt() was used to set the ACPI status
(_STA) for both enabled and disabled devices. The aforementioned commit
limited it to being called only on enabled devices, which left disabled
devices without any _STA method at all -- which the OS assumes means
that the device is present and enabled.

To fix this, create the _STA method in the UART asl code for each port,
and set the return value to a name variable (STAT) which defaults to
0 (not present/disabled). Then, have uart_inject_ssdt() set STAT to
present and enabled (0xF) for UARTs actually present on the board.

TEST=build/boot google/skyrim (frostflow), dump ACPI tables, and verify
that _STA returns 0xF only for UARTs enabled in devicetree.

Change-Id: Id89e74c3ea7f53280935898ee35311b7cf3b152a
Signed-off-by: Matt DeVillier 
---
M src/soc/amd/cezanne/acpi/mmio.asl
M src/soc/amd/common/block/uart/uart.c
M src/soc/amd/glinda/acpi/mmio.asl
M src/soc/amd/mendocino/acpi/mmio.asl
M src/soc/amd/phoenix/acpi/mmio.asl
M src/soc/amd/picasso/acpi/mmio.asl
M src/soc/amd/stoneyridge/acpi/mmio.asl
7 files changed, 138 insertions(+), 4 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/92/77092/4