[coreboot-gerrit] [S] Change in coreboot[master]: acpi: Add warning message when timeout in write_delay_until function

[Cliff Huang (Code Review)]

Attention is currently required from: Lance Zhao, Tim Wawrzynczak.

Hello Lance Zhao, build bot (Jenkins), Tim Wawrzynczak,

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

https://review.coreboot.org/c/coreboot/+/73348

to look at the new patch set (#2).

Change subject: acpi: Add warning message when timeout in write_delay_until function
......................................................................

acpi: Add warning message when timeout in write_delay_until function

The ACPI should print warning message to kernel when timeout during the
loop waiting for the condition to occur

This timeout message won't be displayed when this function are used as
delay loop, (ie. without checking variable condition)

To enable this print to kernel log:
    echo 1 > /sys/module/acpi/parameters/aml_debug_output

ex: Waiting for variable L23E = 0; the max loop count( Local7) = 8
will generate ACPI code:

Local7 = 0x08
    While ((Local7 > Zero))
    {
        If ((L23E == Zero))
        {
            Break
        }

Sleep (0x10)
        Local7--
        If ((Local7 == Zero))
        {
            Debug = "WARN: Wait loop Timeout! variable = L23E"
        }
    }

BRANCH=firmware-brya-14505.B
TEST=Boot to OS and check that the Debug print is added to the function.

Signed-off-by: Cliff Huang 
Change-Id: I3843e51988527e99822017d1b5f653ff2eaa7958
---
M src/acpi/acpigen.c
1 file changed, 47 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/48/73348/2