On 20/04/16 10:56, Vikas Sajjan wrote:
Hi Sudeep, On Tue, Apr 19, 2016 at 6:00 PM, Sudeep Holla <sudeep.holla@xxxxxxx> wrote:ACPI 6.0 adds a new method to specify the CPU idle states(C-states) called Low Power Idle(LPI) states. Since new architectures like ARM64 use only LPIs, introduce ARCH_SUPPORTS_ACPI_PROCESSOR_CSTATE to encapsulate all the code supporting the old style C-states(_CST) This patch will help to extend the processor_idle module to support LPI.
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@@ -1018,29 +1062,11 @@ int acpi_processor_power_init(struct acpi_processor *pr) acpi_status status; int retval; struct cpuidle_device *dev; - static int first_run; if (disabled_by_idle_boot_param()) return 0; - if (!first_run) { - dmi_check_system(processor_power_dmi_table); - max_cstate = acpi_processor_cstate_check(max_cstate); - if (max_cstate < ACPI_C_STATES_MAX) - printk(KERN_NOTICE - "ACPI: processor limited to max C-state %d\n", - max_cstate); - first_run++; - } - - if (acpi_gbl_FADT.cst_control && !nocst) { - status = - acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8); - if (ACPI_FAILURE(status)) { - ACPI_EXCEPTION((AE_INFO, status, - "Notifying BIOS of _CST ability failed")); - } - } + acpi_processor_cstate_first_run_checks(); acpi_processor_get_power_info(pr); pr->flags.power_setup_done = 1;Not related to your change, The acpi_processor_get_power_info() function can return failure, so i thought it makes sense to check for the return value and then set the flag pr->flags.power_setup_done appropriately.
Makes sense, will do that. -- Regards, Sudeep -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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