ACK: [PATCH][VIVID][SRU]SAUCE: ACPI / tables: Add acpi_force_32bit_fadt_addr option to force 32 bit FADT addresses (LP: #1529381)

[Brad Figg]

On Thu, Jan 21, 2016 at 04:43:37PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king at canonical.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/1529381
> 
> 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.
> 
> Signed-off-by: Colin Ian King <colin.king at canonical.com>
> ---
>  Documentation/kernel-parameters.txt |  6 ++++++
>  drivers/acpi/tables.c               | 10 ++++++++++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 33eb611..bfb8cdb 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -262,6 +262,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>  			dynamic table installation which will install SSDT
>  			tables to /sys/firmware/acpi/tables/dynamic.
>  
> +	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 addresss.
> +
>  	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 93b8152..7400c02 100644
> --- a/drivers/acpi/tables.c
> +++ b/drivers/acpi/tables.c
> @@ -406,3 +406,13 @@ 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);
> -- 
> 1.9.1
> 
> 
> -- 
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-- 
Brad Figg brad.figg at canonical.com http://www.canonical.com