> The implementation of Stall is OS-specific, but must not relinquish > control of the processor. Because of this, delays longer than 100 > microseconds must use Sleep instead of Stall. Link: https://github.com/acpica/acpica/commit/05ba545c Signed-off-by: Bob Moore <robert.moore@xxxxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> --- exsystem.c | 5 +++++ 1 file changed, 5 insertions(+) diff -Nurp linux.before_name/drivers/acpi/acpica/exsystem.c linux.after_name/drivers/acpi/acpica/exsystem.c --- linux.before_name/drivers/acpi/acpica/exsystem.c 2022-04-01 18:26:39.407241333 +0200 +++ linux.after_name/drivers/acpi/acpica/exsystem.c 2022-04-01 18:26:35.905285106 +0200 @@ -137,6 +137,11 @@ acpi_status acpi_ex_system_do_stall(u32 "Time parameter is too large (%u)", how_long_us)); status = AE_AML_OPERAND_VALUE; } else { + if (how_long_US > 100) { + ACPI_WARNING((AE_INFO, + "Time parameter %u us > 100 us violating ACPI spec, please fix the firmware.", + how_long_us)); + } acpi_os_stall(how_long_us); }
