cpufreq: intel_pstate: Add one more OOB control bit (589bab6b) · Commits · 戴 / test

Add one more bit for OOB (Out Of Band) enabling of P-states. If OOB handling of P-states is enabled, intel_pstate shouldn't load. Currently, only "BIT(8) == 1" of the MSR MSR_MISC_PWR_MGMT is considered as OOB, but "BIT(18) == 1" needs to be taken into consideration as OOB condition too. Signed-off-by:

Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> [ rjw: Add an empty code line, edit subject and changelog ] Signed-off-by:

Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/intel_pstate.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -2677,6 +2677,8 @@ static struct acpi_platform_list plat_info[] __initdata = {
		{ } /* End */
		};

		#define BITMASK_OOB (BIT(8) \| BIT(18))

		static bool __init intel_pstate_platform_pwr_mgmt_exists(void)
		{
		const struct x86_cpu_id *id;
		@@ -2686,8 +2688,9 @@ static bool __init intel_pstate_platform_pwr_mgmt_exists(void)
		id = x86_match_cpu(intel_pstate_cpu_oob_ids);
		if (id) {
		rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr);
		if (misc_pwr & (1 << 8)) {
		pr_debug("Bit 8 in the MISC_PWR_MGMT MSR set\n");
		if (misc_pwr & BITMASK_OOB) {
		pr_debug("Bit 8 or 18 in the MISC_PWR_MGMT MSR set\n");
		pr_debug("P states are controlled in Out of Band mode by the firmware/hardware\n");
		return true;
		}
		}

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