mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-15 16:53:54 +08:00
ACPI: add "processor.ignore_ppc" hook to workaround BIOS _PPC weirdness
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> Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
parent
e697789d64
commit
623b78c39c
@ -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(struct notifier_block *nb,
|
||||
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_limit(struct acpi_processor *pr)
|
||||
|
||||
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
|
||||
|
Loading…
Reference in New Issue
Block a user