From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: "Zheng, Lv" <lv.zheng@intel.com>
Cc: "Lan, Tianyu" <tianyu.lan@intel.com>,
"wsa@the-dreams.de" <wsa@the-dreams.de>,
"rjw@rjwysocki.net" <rjw@rjwysocki.net>,
"awilliam@redhat.com" <awilliam@redhat.com>,
"lenb@kernel.org" <lenb@kernel.org>,
"linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>
Subject: Re: [Resend Patch 9/9] I2C/ACPI: Add CONFIG_I2C_ACPI config
Date: Wed, 23 Apr 2014 10:40:56 +0300 [thread overview]
Message-ID: <20140423074056.GU30677@intel.com> (raw)
In-Reply-To: <1AE640813FDE7649BE1B193DEA596E88025577CB@SHSMSX101.ccr.corp.intel.com>
On Wed, Apr 23, 2014 at 06:47:05AM +0000, Zheng, Lv wrote:
> Hi, Tianyu
>
> > From: Lan, Tianyu
> > Sent: Wednesday, April 23, 2014 1:40 PM
> >
> > On 2014年04月22日 19:45, Mika Westerberg wrote:
> > > On Tue, Apr 22, 2014 at 02:24:15PM +0800, Lan Tianyu wrote:
> > >> This patch is to add CONFIG_I2C_ACPI. Current there is a race between
> > >> removing I2C ACPI operation region and ACPI AML code accessing.
> > >> So make i2c core built-in if CONFIG_I2C_ACPI is set.
> > >>
> > >> Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
> > >> ---
> > >> drivers/i2c/Kconfig | 17 ++++++++++++++++-
> > >> drivers/i2c/Makefile | 2 +-
> > >> include/linux/i2c.h | 2 +-
> > >> 3 files changed, 18 insertions(+), 3 deletions(-)
> > >>
> > >> diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
> > >> index 7b7ea32..c670d49 100644
> > >> --- a/drivers/i2c/Kconfig
> > >> +++ b/drivers/i2c/Kconfig
> > >> @@ -2,7 +2,9 @@
> > >> # I2C subsystem configuration
> > >> #
> > >>
> > >> -menuconfig I2C
> > >> +menu "I2C support"
> > >> +
> > >> +config I2C
> > >> tristate "I2C support"
> > >> select RT_MUTEXES
> > >> ---help---
> > >> @@ -21,6 +23,17 @@ menuconfig I2C
> > >> This I2C support can also be built as a module. If so, the module
> > >> will be called i2c-core.
> > >>
> > >> +config I2C_ACPI
> > >> + bool "I2C ACPI support"
> > >> + select I2C
> > >> + depends on ACPI
> > >> + default y
> > >> + help
> > >> + Say Y here if you want to enable I2C ACPI function. ACPI table
> > >> + provides I2C slave devices' information to enumerate these devices.
> > >> + This option also allows ACPI AML code to access I2C slave devices
> > >> + via I2C ACPI operation region to fulfill ACPI method.
> > >> +
> > >
> > > I'm wondering, can we provide some sort of wrapper function from ACPI core
> > > that is guaranteed to be built in to the kernel image and use it instead of
> > > adding new Kconfig options?
> > >
> > Cc: LV
> >
> > LV tried to fix the issue via wrapper solution in the ACPI code before.
> > https://lkml.org/lkml/2013/7/23/87
> >
> > He has a plan to resolve the issue in ACPICA later.
> >
> > Other choice is to increase the i2c-core module count to prevent it
> > being unloaded when i2c operation region handler is installed. Remove
> > the code When LV finish his job.
>
> You may see it implemented in ACPICA after several release.
> If you need a fix for now, you can use the patch pointed to by the link you've provided,
> Or you could find an updated one here:
> acpi-ipmi13.patch archived in (https://bugzilla.kernel.org/attachment.cgi?id=112611)
>
> I think the solution you've provided in this patch is also reasonable for now.
> IPMI also uses a similar solution to solve this issue.
> Please refer to the CONFIG_ACPI_IPMI.
>
> The story can be found at:
> http://www.spinics.net/lists/linux-acpi/msg49044.html
> And the similar solution can be found at:
> http://www.spinics.net/lists/linux-acpi/msg49184.html
Thanks for the pointers.
Given that the IPMI problem was solved like this I guess I2C operation
regions can follow the same pattern if there is no better solution
available.
Out of curiousity: how did you plan to fix this in ACPICA?
next prev parent reply other threads:[~2014-04-23 7:34 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-16 13:24 [PATCH 0/9] I2C ACPI operation region handler support Lan Tianyu
2014-04-16 13:24 ` [PATCH 1/9] ACPICA: Executer: Fix buffer allocation issue for generic_serial_bus region field accesses Lan Tianyu
2014-04-21 21:38 ` Rafael J. Wysocki
2014-04-22 1:14 ` Lan Tianyu
2014-04-16 13:24 ` [PATCH 2/9] ACPICA: Export acpi_buffer_to_resource symbol Lan Tianyu
2014-04-16 13:24 ` [PATCH 3/9] ACPI: Add acpi_bus_attach_private_data() to facilitate to attach data to ACPI handle Lan Tianyu
2014-04-16 13:24 ` [PATCH 4/9] ACPI/Thermal: Use acpi_bus_attach_private_data() to attach private data Lan Tianyu
2014-04-16 13:24 ` [PATCH 5/9] I2C: Add smbus quick read/write helper function Lan Tianyu
2014-04-16 13:24 ` [PATCH 6/9] I2C: Add smbus word/block process call " Lan Tianyu
2014-04-16 13:24 ` [PATCH 7/9] I2C/ACPI: Add i2c ACPI operation region support Lan Tianyu
2014-04-16 13:24 ` [PATCH 8/9] I2C/ACPI: Move ACPI related code to i2c-acpi.c Lan Tianyu
2014-04-16 13:24 ` [PATCH 9/9] I2C/ACPI: Add CONFIG_I2C_ACPI config Lan Tianyu
2014-04-16 13:33 ` [PATCH 0/9] I2C ACPI operation region handler support Lan Tianyu
2014-04-16 16:35 ` Adam Williamson
2014-04-22 6:24 ` [Resend Patch " Lan Tianyu
2014-04-22 6:24 ` [Resend Patch 1/9] ACPICA: Executer: Fix buffer allocation issue for generic_serial_bus region field accesses Lan Tianyu
2014-04-22 11:21 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 2/9] ACPICA: Export acpi_buffer_to_resource symbol Lan Tianyu
2014-04-22 11:21 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 3/9] ACPI: Add acpi_bus_attach_private_data() to facilitate to attach data to ACPI handle Lan Tianyu
2014-04-22 11:23 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 4/9] ACPI/Thermal: Use acpi_bus_attach_private_data() to attach private data Lan Tianyu
2014-04-22 11:24 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 5/9] I2C: Add smbus quick read/write helper function Lan Tianyu
2014-04-22 11:24 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 6/9] I2C: Add smbus word/block process call " Lan Tianyu
2014-04-22 11:26 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 7/9] I2C/ACPI: Add i2c ACPI operation region support Lan Tianyu
2014-04-22 11:36 ` Mika Westerberg
2014-04-23 1:53 ` Lan Tianyu
2014-04-23 7:28 ` Mika Westerberg
2014-04-23 7:17 ` Lan Tianyu
2014-04-22 6:24 ` [Resend Patch 8/9] I2C/ACPI: Move ACPI related code to i2c-acpi.c Lan Tianyu
2014-04-22 11:38 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 9/9] I2C/ACPI: Add CONFIG_I2C_ACPI config Lan Tianyu
2014-04-22 11:45 ` Mika Westerberg
2014-04-23 5:39 ` Lan Tianyu
2014-04-23 6:47 ` Zheng, Lv
2014-04-23 7:40 ` Mika Westerberg [this message]
2014-04-23 23:03 ` [Resend Patch 0/9] I2C ACPI operation region handler support Adam Williamson
2014-04-28 14:27 ` [Patch V2 " Lan Tianyu
2014-04-28 14:27 ` [Patch V2 1/9] ACPICA: Executer: Fix buffer allocation issue for generic_serial_bus region field accesses Lan Tianyu
2014-04-28 17:52 ` Adam Williamson
2014-04-28 18:08 ` Adam Williamson
2014-04-28 22:50 ` Rafael J. Wysocki
2014-04-29 11:31 ` Wolfram Sang
2014-04-29 21:37 ` Rafael J. Wysocki
2014-04-28 14:27 ` [Patch V2 2/9] ACPICA: Export acpi_buffer_to_resource symbol Lan Tianyu
2014-04-28 14:27 ` [Patch V2 3/9] ACPI: Add acpi_bus_attach_private_data() to facilitate to attach data to ACPI handle Lan Tianyu
2014-04-28 14:27 ` [Patch V2 4/9] ACPI/Thermal: Use acpi_bus_attach_private_data() to attach private data Lan Tianyu
2014-04-28 14:27 ` [Patch V2 5/9] I2C: Add smbus quick read/write helper function Lan Tianyu
2014-05-17 9:41 ` Wolfram Sang
2014-05-17 13:13 ` Lan Tianyu
2014-05-17 17:15 ` Wolfram Sang
2014-04-28 14:27 ` [Patch V2 6/9] I2C: Add smbus word/block process call " Lan Tianyu
2014-05-17 10:21 ` Wolfram Sang
2014-05-17 13:59 ` Lan Tianyu
2014-05-17 17:17 ` Wolfram Sang
2014-05-19 9:23 ` Lan Tianyu
2014-04-28 14:27 ` [Patch V2 7/9] I2C/ACPI: Add i2c ACPI operation region support Lan Tianyu
2014-04-29 8:02 ` Mika Westerberg
2014-04-28 14:27 ` [Patch V2 8/9] I2C/ACPI: Move ACPI related code to i2c-acpi.c Lan Tianyu
2014-04-28 14:27 ` [Patch V2 9/9] I2C/ACPI: Add CONFIG_I2C_ACPI config Lan Tianyu
2014-04-29 8:16 ` Mika Westerberg
2014-05-17 17:48 ` Wolfram Sang
2014-05-19 8:49 ` Mika Westerberg
2014-05-19 9:44 ` Lan Tianyu
2014-05-19 20:23 ` Rafael J. Wysocki
2014-04-28 22:51 ` [Patch V2 0/9] I2C ACPI operation region handler support Rafael J. Wysocki
2014-04-29 1:54 ` Lan Tianyu
2014-04-29 15:47 ` Rafael J. Wysocki
2014-05-13 13:09 ` Rolf Eike Beer
2014-05-13 14:06 ` Lan Tianyu
2014-05-15 7:50 ` Rolf Eike Beer
2014-05-15 14:49 ` Lan Tianyu
2014-05-16 8:43 ` Rolf Eike Beer
2014-05-20 14:17 ` Rolf Eike Beer
2014-05-22 15:14 ` Lan Tianyu
2014-05-23 6:55 ` Rolf Eike Beer
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