Add kernel command line parameter intel_pstate = ignore_acpi_ppc and module parameter ignore_acpi_ppc = 1 to allow driver to ignore the ACPI _PPC existence even for Sun x86 servers. These parameter could be used for debug\test\workaround etc purpose.
Signed-off-by: Ethan Zhao <[email protected]> --- Documentation/kernel-parameters.txt | 3 +++ drivers/cpufreq/intel_pstate.c | 8 +++++++- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 4c81a86..f502b85 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1446,6 +1446,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. disable Do not enable intel_pstate as the default scaling driver for the supported processors + ignore_acpi_ppc + Ignore the existence of ACPI method _PPC for Sun x86 servers + and load the driver. intremap= [X86-64, Intel-IOMMU] on enable Interrupt Remapping (default) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 7c5faea..388387b 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -870,6 +870,7 @@ static struct cpufreq_driver intel_pstate_driver = { }; static int __initdata no_load; +static unsigned int ignore_acpi_ppc; static int intel_pstate_msrs_not_valid(void) { @@ -990,7 +991,7 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void) intel_pstate_no_acpi_pss()) return true; if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) && - intel_pstate_has_acpi_ppc()) + intel_pstate_has_acpi_ppc() && !ignore_acpi_ppc) return true; } @@ -1066,11 +1067,16 @@ static int __init intel_pstate_setup(char *str) if (!strcmp(str, "disable")) no_load = 1; + if (!strcmp(str, "ignore_acpi_ppc")) + ignore_acpi_ppc = 1; return 0; } early_param("intel_pstate", intel_pstate_setup); #endif +module_param(ignore_acpi_ppc, uint, 0644); +MODULE_PARM_DESC(ignore_acpi_ppc, + "value 0 or non-zero. non-zero -> ignore ACPI _PPC and load this driver"); MODULE_AUTHOR("Dirk Brandewie <[email protected]>"); MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); MODULE_LICENSE("GPL"); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
