From 0406ad336c066190770cbf350b552d608e43ed09 Mon Sep 17 00:00:00 2001
From: Alex Chiang <achiang@hp.com>
Date: Wed, 20 Jan 2010 00:06:30 -0700
Subject: [PATCH] ACPI: processor: add kernel command line support for early
_PDC eval
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>
---
Documentation/kernel-parameters.txt | 4 ++++
drivers/acpi/processor_pdc.c | 7 +++++++
2 files changed, 11 insertions(+)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 736d45602886e..826b6e1483166 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -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
diff --git a/drivers/acpi/processor_pdc.c b/drivers/acpi/processor_pdc.c
index 7247819dbd80b..3bbafe9576aec 100644
--- a/drivers/acpi/processor_pdc.c
+++ b/drivers/acpi/processor_pdc.c
@@ -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", {
--
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