summaryrefslogtreecommitdiff
path: root/drivers/idle
diff options
context:
space:
mode:
authorLen Brown <len.brown@intel.com>2014-02-14 02:30:00 -0500
committerLen Brown <len.brown@intel.com>2014-02-19 17:42:58 -0500
commit718987d695adc991eb94501209fe5353136c8c16 (patch)
treeacd90c3afea5cfea767852f3569643cf2a936fb9 /drivers/idle
parent24bfa950f114d5d770e482de73cf673a3b017f65 (diff)
downloadkernel-718987d695adc991eb94501209fe5353136c8c16.tar.gz
intel_idle: support Bay Trail
Bay Trail (BYT) is a family of Silvermont-core Atom Processor SOCs, including the Intel Atom Processor Z36xxx and Z37xxx Series. Although it shares the Silvermont core with Avoton, BYT is optimized for mobile, and thus it supports different power saving CPU idle states. Note that not all versions of Bay Trail HW support all of the states listed in the driver. Signed-off-by: Len Brown <len.brown@intel.com> Tested-by: Aubrey Li <aubrey.li@linux.intel.com>
Diffstat (limited to 'drivers/idle')
-rw-r--r--drivers/idle/intel_idle.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 057ffef37b42..aeddfc46c831 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -196,6 +196,53 @@ static struct cpuidle_state snb_cstates[] = {
.enter = NULL }
};
+static struct cpuidle_state byt_cstates[] = {
+ {
+ .name = "C1-BYT",
+ .desc = "MWAIT 0x00",
+ .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_TIME_VALID,
+ .exit_latency = 1,
+ .target_residency = 1,
+ .enter = &intel_idle },
+ {
+ .name = "C1E-BYT",
+ .desc = "MWAIT 0x01",
+ .flags = MWAIT2flg(0x01) | CPUIDLE_FLAG_TIME_VALID,
+ .exit_latency = 15,
+ .target_residency = 30,
+ .enter = &intel_idle },
+ {
+ .name = "C6N-BYT",
+ .desc = "MWAIT 0x58",
+ .flags = MWAIT2flg(0x58) | CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 40,
+ .target_residency = 275,
+ .enter = &intel_idle },
+ {
+ .name = "C6S-BYT",
+ .desc = "MWAIT 0x52",
+ .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 140,
+ .target_residency = 560,
+ .enter = &intel_idle },
+ {
+ .name = "C7-BYT",
+ .desc = "MWAIT 0x60",
+ .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 1200,
+ .target_residency = 1500,
+ .enter = &intel_idle },
+ {
+ .name = "C7S-BYT",
+ .desc = "MWAIT 0x64",
+ .flags = MWAIT2flg(0x64) | CPUIDLE_FLAG_TIME_VALID | CPUIDLE_FLAG_TLB_FLUSHED,
+ .exit_latency = 10000,
+ .target_residency = 20000,
+ .enter = &intel_idle },
+ {
+ .enter = NULL }
+};
+
static struct cpuidle_state ivb_cstates[] = {
{
.name = "C1-IVB",
@@ -464,6 +511,11 @@ static const struct idle_cpu idle_cpu_snb = {
.disable_promotion_to_c1e = true,
};
+static const struct idle_cpu idle_cpu_byt = {
+ .state_table = byt_cstates,
+ .disable_promotion_to_c1e = true,
+};
+
static const struct idle_cpu idle_cpu_ivb = {
.state_table = ivb_cstates,
.disable_promotion_to_c1e = true,
@@ -494,6 +546,7 @@ static const struct x86_cpu_id intel_idle_ids[] = {
ICPU(0x2f, idle_cpu_nehalem),
ICPU(0x2a, idle_cpu_snb),
ICPU(0x2d, idle_cpu_snb),
+ ICPU(0x37, idle_cpu_byt),
ICPU(0x3a, idle_cpu_ivb),
ICPU(0x3e, idle_cpu_ivb),
ICPU(0x3c, idle_cpu_hsw),