Re: [PATCH v2] intel_idle: add idle values for Cherrytrail/Braswell
From: Mika Westerberg
Date: Tue Aug 26 2014 - 05:01:04 EST
On Tue, Aug 26, 2014 at 10:38:32AM +0800, Li, Aubrey wrote:
> On 2014/8/25 18:12, Mika Westerberg wrote:
> > On Fri, Aug 22, 2014 at 10:06:21PM +0800, Li, Aubrey wrote:
> >> On 2014/8/22 19:39, Mika Westerberg wrote:
> >>> From: Mahesh Kumar P <mahesh.kumar.p@xxxxxxxxx>
> >>> Cherrytrail/Braswell is a successor of Intel Baytrail but has slighly
> >>> different CPU idle values and latencies.
> >>> Signed-off-by: Kumar P Mahesh <mahesh.kumar.p@xxxxxxxxx>
> >>> Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
> >>> Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> >>> ---
> >>> 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
> > OK, here goes:
> ACPI exposes 0x58 as C6 mwait hint while the patch proposes 0x52 for C6.
> Can you please remove "intel_idle.max_cstate=0" and run "dmesg | grep
> idle" again to see how many C6 supports in CPUID enumeration?
[ 16.685769] intel_idle: MWAIT substates: 0x33000020
[ 16.691236] intel_idle: v0.4 model 0x4C
[ 16.695539] intel_idle: lapic_timer_reliable_states 0xffffffff
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