From: Zhao Yakui Date: Tue, 17 Jun 2008 06:39:59 +0000 (+0800) Subject: ACPI: Disable the C2C3_FFH access mode HW has no MWAIT support X-Git-Tag: v3.0~14696^2~37 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5b53496a5ad79e91052f72761a7c5516b069bc99;p=platform%2Fkernel%2Flinux-amlogic.git ACPI: Disable the C2C3_FFH access mode HW has no MWAIT support 991528d7348667924176f3e29addea0675298944 (ACPI: Processor native C-states using MWAIT) started passing C2C3_FFH to _PDC to tell the BIOS that Linux supports MWAIT for deep C-states. However, we should first double check with the hardware that it actually supports MWAIT before potentially exposing a BIOS bug of an MWAIT _CST on HW that doesn't support MWAIT. Signed-off-by: Zhao Yakui Signed-off-by: Li Shaohua Signed-off-by: Len Brown Signed-off-by: Andi Kleen --- diff --git a/arch/x86/kernel/acpi/processor.c b/arch/x86/kernel/acpi/processor.c index de2d2e4..7c074ee 100644 --- a/arch/x86/kernel/acpi/processor.c +++ b/arch/x86/kernel/acpi/processor.c @@ -56,6 +56,12 @@ static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c) if (cpu_has(c, X86_FEATURE_ACPI)) buf[2] |= ACPI_PDC_T_FFH; + /* + * If mwait/monitor is unsupported, C2/C3_FFH will be disabled + */ + if (!cpu_has(c, X86_FEATURE_MWAIT)) + buf[2] &= ~(ACPI_PDC_C_C2C3_FFH); + obj->type = ACPI_TYPE_BUFFER; obj->buffer.length = 12; obj->buffer.pointer = (u8 *) buf;