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ACPI: processor: add kernel command line support for early _PDC eval

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Allow platforms not listed in DMI table
to opt-in and evaluate _PDC early.

Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Alex Chiang 2010-01-20 00:06:30 -07:00 committed by Len Brown
parent 92dcffb916
commit 0406ad336c
2 changed files with 11 additions and 0 deletions
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4
Documentation/kernel-parameters.txt
View file

@ -199,6 +199,10 @@ and is between 256 and 4096 characters. It is defined in the file
acpi_display_output=video
See above.
acpi_early_pdc_eval [HW,ACPI] Evaluate processor _PDC methods
early. Needed on some platforms to properly
initialize the EC.
acpi_irq_balance [HW,ACPI]
ACPI will balance active IRQs
default in APIC mode

7
drivers/acpi/processor_pdc.c
View file

@ -151,6 +151,13 @@ static int set_early_pdc_optin(const struct dmi_system_id *id)
return 0;
}
static int param_early_pdc_optin(char *s)
{
early_pdc_optin = 1;
return 1;
}
__setup("acpi_early_pdc_eval", param_early_pdc_optin);
static struct dmi_system_id __cpuinitdata early_pdc_optin_table[] = {
{
set_early_pdc_optin, "HP Envy", {