diff options
| author | Michael Niewöhner <foss@mniewoehner.de> | 2021-09-25 00:40:52 +0200 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2021-10-16 09:09:19 +0000 |
| commit | 5c259642c2d59c551fb0e54a14d9eeeb878d1177 (patch) | |
| tree | 051d514975d2a6d32c9806bfc97cdf2aa56a0d1c /src/soc/intel/common/block/acpi | |
| parent | d4d4f08f54350bec12a6ff7680709e9c50d4cb19 (diff) | |
soc/intel/{common,skl}: set ACPI_FADT_PLATFORM_CLOCK based on Kconfig
The FADT contains a flag `ACPI_FADT_PLATFORM_CLOCK` telling the OSPM if
a specification-compliant PM Timer is present. Currently, this flag is
set regardless of the timer being enabled or disabled.
To be specification-compliant, only set that flag, when the hardware PM
Timer is enabled. This changes behaviour of all mainboards defaulting to
USE_PM_ACPI_TIMER=n.
Note: On platforms supporting uCode PM ACPI Timer emulation, this is
required, too, because emulation does not support `TMR_STS`. Any
OS or software checking this flag and thus relying on the overflow
flag would not work (properly).
Change-Id: Id2e5d69b5515c21e6ce922dab2cb88b494c65ebe
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57934
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'src/soc/intel/common/block/acpi')
| -rw-r--r-- | src/soc/intel/common/block/acpi/acpi.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/soc/intel/common/block/acpi/acpi.c b/src/soc/intel/common/block/acpi/acpi.c index cff2e219fd..c21a861390 100644 --- a/src/soc/intel/common/block/acpi/acpi.c +++ b/src/soc/intel/common/block/acpi/acpi.c @@ -149,8 +149,10 @@ void acpi_fill_fadt(acpi_fadt_t *fadt) fadt->flags |= ACPI_FADT_WBINVD | ACPI_FADT_C1_SUPPORTED | ACPI_FADT_SLEEP_BUTTON | - ACPI_FADT_SEALED_CASE | ACPI_FADT_S4_RTC_WAKE | - ACPI_FADT_PLATFORM_CLOCK; + ACPI_FADT_SEALED_CASE | ACPI_FADT_S4_RTC_WAKE; + + if (CONFIG(USE_PM_ACPI_TIMER) || !CONFIG(PM_ACPI_TIMER_OPTIONAL)) + fadt->flags |= ACPI_FADT_PLATFORM_CLOCK; fadt->x_pm1a_evt_blk.space_id = ACPI_ADDRESS_SPACE_IO; fadt->x_pm1a_evt_blk.bit_width = fadt->pm1_evt_len * 8; |