[PATCH] Workaround for _PPC (BIOS cpufreq limitations)

Thomas Renninger
2007-05-19T02:59:26Z

[-- Attachment #1: Type: text/plain, Size: 1631 bytes --]

Len, can you apply this one, pls.

Workaround for _PPC (BIOS cpufreq limitations)

There have been fixes using _PPC, which seem to unhide a problem
on HP nx6125 (double cpufreq switch freezes the machine for
several seconds).
This one should provide a workaround for the nx6125 and for
possible other machines that show any weird _PPC behaviour.

Signed-off-by: Thomas Renninger <trenn@suse.de>

---
drivers/acpi/processor_perflib.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

Index: linux-2.6.21/drivers/acpi/processor_perflib.c
===================================================================
--- linux-2.6.21.orig/drivers/acpi/processor_perflib.c
+++ linux-2.6.21/drivers/acpi/processor_perflib.c
@@ -60,6 +60,11 @@ static DEFINE_MUTEX(performance_mutex);
* policy is adjusted accordingly.
*/

+static unsigned int ignore_ppc = 0;
+module_param(ignore_ppc, uint, 0644);
+MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
+ "limited by BIOS, this should help");
+
#define PPC_REGISTERED 1
#define PPC_IN_USE 2

@@ -72,6 +77,9 @@ static int acpi_processor_ppc_notifier(s
struct acpi_processor *pr;
unsigned int ppc = 0;

+ if (ignore_ppc)
+ return 0;
+
mutex_lock(&performance_mutex);

if (event != CPUFREQ_INCOMPATIBLE)
@@ -130,7 +138,13 @@ static int acpi_processor_get_platform_l

int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
{
- int ret = acpi_processor_get_platform_limit(pr);
+ int ret;
+
+ if (ignore_ppc)
+ return 0;
+
+ ret = acpi_processor_get_platform_limit(pr);
+
if (ret < 0)
return (ret);
else

[-- Attachment #2: cpufreq_ppc_boot_option.patch --]
[-- Type: text/x-patch, Size: 1596 bytes --]

Workaround for _PPC (BIOS cpufreq limitations)

There have been fixes using _PPC, which seem to unhide a problem
on HP nx6125 (double cpufreq switch freezes the machine for
several seconds).
This one should provide a workaround for the nx6125 and for
possible other machines that show any weird _PPC behaviour.

Signed-off-by: Thomas Renninger <trenn@suse.de>

---
drivers/acpi/processor_perflib.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

Index: linux-2.6.21/drivers/acpi/processor_perflib.c
===================================================================
--- linux-2.6.21.orig/drivers/acpi/processor_perflib.c
+++ linux-2.6.21/drivers/acpi/processor_perflib.c
@@ -60,6 +60,11 @@ static DEFINE_MUTEX(performance_mutex);
* policy is adjusted accordingly.
*/

+static unsigned int ignore_ppc = 0;
+module_param(ignore_ppc, uint, 0644);
+MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
+ "limited by BIOS, this should help");
+
#define PPC_REGISTERED 1
#define PPC_IN_USE 2

@@ -72,6 +77,9 @@ static int acpi_processor_ppc_notifier(s
struct acpi_processor *pr;
unsigned int ppc = 0;

+ if (ignore_ppc)
+ return 0;
+
mutex_lock(&performance_mutex);

if (event != CPUFREQ_INCOMPATIBLE)
@@ -130,7 +138,13 @@ static int acpi_processor_get_platform_l

int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
{
- int ret = acpi_processor_get_platform_limit(pr);
+ int ret;
+
+ if (ignore_ppc)
+ return 0;
+
+ ret = acpi_processor_get_platform_limit(pr);
+
if (ret < 0)
return (ret);
else