linux-kernel - Re: [PATCH v2] intel_idle: add idle values for Cherrytrail/Braswell

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Message-ID: <20140826090032.GN1660@lahna.fi.intel.com>
Date:	Tue, 26 Aug 2014 12:00:32 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
Cc:	Len Brown <lenb@...nel.org>,
	Kumar P Mahesh <mahesh.kumar.p@...el.com>,
	Alan Cox <alan@...ux.intel.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] intel_idle: add idle values for Cherrytrail/Braswell

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@...el.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.kumar.p@...el.com>
> >>> Signed-off-by: Alan Cox <alan@...ux.intel.com>
> >>> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.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
> > 
> > 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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