On 2014/8/22 19:39, Mika Westerberg wrote:
> From: Mahesh Kumar P <mahesh.kuma...@intel.com>
>
> Cherrytrail/Braswell is a successor of Intel Baytrail but has slighly
> different CPU idle values and latencies.
>
> Signed-off-by: Kumar P Mahesh <mahesh.kuma...@intel.com>
> Signed-off-by: Alan Cox <a...@linux.intel.com>
> Signed-off-by: Mika Westerberg <mika.westerb...@linux.intel.com>
> ---
> I learned from Mahesh that C1e, C4 and S0i2 states are deprecated so those
> are now removed.
If the platform has ACPI supported, I believe Len wants to see what
C-states number exported by ACPI.
Please boot the machine with "intel_idle.max_cstate=0" to disable
intel_idle, then post the output of the following commands
dmesg | grep idle
grep . /sys/devices/system/cpu/cpu0/cpuidle/*/*
Thanks,
-Aubrey
>
> drivers/idle/intel_idle.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 42 insertions(+)
>
> diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
> index 9b7ee7e427df..e472580c1826 100644
> --- a/drivers/idle/intel_idle.c
> +++ b/drivers/idle/intel_idle.c
> @@ -197,6 +197,42 @@ static struct cpuidle_state snb_cstates[] = {
> .enter = NULL }
> };
>
> +static struct cpuidle_state cht_cstates[] = {
> + { /* MWAIT C1 */
> + .name = "C1-CHT",
> + .desc = "MWAIT 0x00",
> + .flags = MWAIT2flg(0x00) | CPUIDLE_FLAG_TIME_VALID,
> + .exit_latency = 1,
> + .target_residency = 4,
> + .enter = &intel_idle },
> + { /* MWAIT C6 */
> + .name = "C6-CHT",
> + .desc = "MWAIT 0x52",
> + .flags = MWAIT2flg(0x52) | CPUIDLE_FLAG_TIME_VALID
> + | CPUIDLE_FLAG_TLB_FLUSHED,
> + .exit_latency = 140,
> + .target_residency = 560,
> + .enter = &intel_idle },
> + { /* MWAIT C7-S0i1 */
> + .name = "S0i1-CHT",
> + .desc = "MWAIT 0x60",
> + .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TIME_VALID
> + | CPUIDLE_FLAG_TLB_FLUSHED,
> + .exit_latency = 1200,
> + .target_residency = 4000,
> + .enter = &intel_idle },
> + { /* MWAIT C9-S0i3 */
> + .name = "S0i3-CHT",
> + .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 byt_cstates[] = {
> {
> .name = "C1-BYT",
> @@ -677,6 +713,11 @@ static const struct idle_cpu idle_cpu_byt = {
> .byt_auto_demotion_disable_flag = true,
> };
>
> +static const struct idle_cpu idle_cpu_cht = {
> + .state_table = cht_cstates,
> + .disable_promotion_to_c1e = true,
> +};
> +
> static const struct idle_cpu idle_cpu_ivb = {
> .state_table = ivb_cstates,
> .disable_promotion_to_c1e = true,
> @@ -725,6 +766,7 @@ static const struct x86_cpu_id intel_idle_ids[] = {
> ICPU(0x3f, idle_cpu_hsw),
> ICPU(0x45, idle_cpu_hsw),
> ICPU(0x46, idle_cpu_hsw),
> + ICPU(0x4c, idle_cpu_cht),
> ICPU(0x4d, idle_cpu_avn),
> ICPU(0x3d, idle_cpu_bdw),
> ICPU(0x4f, idle_cpu_bdw),
>
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