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| author | Colin Ian King <colin.king@canonical.com> | 2016-01-21 17:05:47 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-03-09 23:46:07 +0100 |
| commit | b2ca5dae31d61c4610ea3228f43f7cc66312897c (patch) | |
| tree | f51780882162e90706be785ca9b7057854577e0f | |
| parent | 75829dcf10862966f52716f2d67ac1c1b1eb486b (diff) | |
| download | talos-obmc-linux-b2ca5dae31d61c4610ea3228f43f7cc66312897c.tar.gz talos-obmc-linux-b2ca5dae31d61c4610ea3228f43f7cc66312897c.zip | |
ACPI: Add acpi_force_32bit_fadt_addr option to force 32 bit FADT addresses
Some HP laptops seem to have invalid 64 bit FADT X_PM* addresses
which are causing various boot issues. In these cases, it would
be useful to force ACPI to use the valid legacy 32 bit equivalent
PM addresses. Add a acpi_force_32bit_fadt_addr to set the ACPICA
acpi_gbl_use32_bit_fadt_addresses to TRUE to force this override.
Link: https://bugs.launchpad.net/bugs/1529381
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 6 | ||||
| -rw-r--r-- | drivers/acpi/tables.c | 10 |
2 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 9a53c929f017..64b5431904c3 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -193,6 +193,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. (e.g. thinkpad_acpi, sony_acpi, etc.) instead of the ACPI video.ko driver. + acpi_force_32bit_fadt_addr + force FADT to use 32 bit addresses rather than the + 64 bit X_* addresses. Some firmware have broken 64 + bit addresses for force ACPI ignore these and use + the older legacy 32 bit addresses. + acpica_no_return_repair [HW, ACPI] Disable AML predefined validation mechanism This mechanism can repair the evaluation result to make diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c index 6c0f0794aa82..ebdf5643cd8e 100644 --- a/drivers/acpi/tables.c +++ b/drivers/acpi/tables.c @@ -484,3 +484,13 @@ static int __init acpi_force_table_verification_setup(char *s) } early_param("acpi_force_table_verification", acpi_force_table_verification_setup); + +static int __init acpi_force_32bit_fadt_addr(char *s) +{ + pr_info("Forcing 32 Bit FADT addresses\n"); + acpi_gbl_use32_bit_fadt_addresses = TRUE; + + return 0; +} + +early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); |
