linux-kernel - RE: Regression between rc2 and rc6: ACPI EC problems

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Date:	Thu, 7 Jul 2016 00:34:23 +0000
From:	"Zheng, Lv" <lv.zheng@...el.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Wolfram Sang <wsa@...-dreams.de>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Regression between rc2 and rc6: ACPI EC problems

Hi, Rafael

> From: linux-acpi-owner@...r.kernel.org [mailto:linux-acpi-
> owner@...r.kernel.org] On Behalf Of Rafael J. Wysocki
> Subject: Re: Regression between rc2 and rc6: ACPI EC problems
> 
> On Thursday, July 07, 2016 12:26:49 AM Zheng, Lv wrote:
> > Hi, Rafael
> >
> > > From: Rafael J. Wysocki [mailto:rjw@...ysocki.net]
> > > Sent: Thursday, July 7, 2016 5:29 AM
> > > Subject: Re: Regression between rc2 and rc6: ACPI EC problems
> > >
> > > On Wednesday, July 06, 2016 11:14:11 PM Wolfram Sang wrote:
> > > > Hi,
> > > >
> > > > when upgrading from v4.7-rc2 to rc6 on my Dell Mini 9, battery and
> > > > temperature status info got bogus. Here is the major change
> between
> > > the
> > > > boot logs:
> > > >
> > > > ACPI : EC: EC stopped
> > > > ACPI Exception: AE_BAD_PARAMETER, Returned by Handler for
> > > [EmbeddedControl] (20160422/evregion-300)
> > > > ACPI Error: Method parse/execution failed [\_SB.PCI0.LPCB.EC0._REG]
> > > (Node f5d09870), AE_BAD_PARAMETER (20160422/psparse-542)
> > > > ACPI Exception: AE_BAD_PARAMETER, from region _REG,
> > > [EmbeddedControl] (20160422/evregion-397)
> > > > ACPI Exception: AE_BAD_PARAMETER, Returned by Handler for
> > > [EmbeddedControl] (20160422/evregion-300)
> > > > ACPI Error: Method parse/execution failed [\_SB.PCI0.LPCB.EC0._REG]
> > > (Node f5d09870), AE_BAD_PARAMETER (20160422/psparse-542)
> > > > ACPI Exception: AE_BAD_PARAMETER, from region _REG,
> > > [EmbeddedControl] (20160422/evregion-397)
> > > > ACPI : EC: GPE = 0x19, I/O: command/status = 0x66, data = 0x62
> > > > ACPI : EC: EC started
> > [Lv Zheng]
> > This is a known order issue that ACPICA executes _REG(DISCONENCT)
> after removing the opregion handler.
> > But this issue is not a function failure, it only generates error garbage in
> the kernel log.
> > So we didn't fix it in a hurry.
> >
> > There is another order issue detected in the same Bugzilla entry that:
> > _REG(CONNECT/DISCONNECT) shouldn't be invoked for
> SystemMemory/SystemIo and PCI_Config that under a PCI root bus
> containing _BBN method.
> > Which is also proven by the Windows behavior and spec definitions.
> >
> > I was planning to fix the both issues in the ACPICA upstream.
> > The bug is here for your reference:
> > https://bugzilla.kernel.org/show_bug.cgi?id=102421
> >
> > For now, since this is just a non-function-failure error report, we can
> ignore it.
> > Because sometimes, when there are several problems related, we have
> to make a choice to fix one of them first.
> 
> Well, please look at the report again.  It says:
> 
> "when upgrading from v4.7-rc2 to rc6 on my Dell Mini 9, battery and
> temperature status info got bogus".
> 
> So, it very much *is* a functional issue and I'm not going to ignore it.
[Lv Zheng] 
What does the bogus mean here?
Anyway, I'll post a fix for this first.
I'll do this right now.

Thanks and best regards
-Lv