linux-kernel - Re: [PATCH v2] sp5100_tco: Set the AcpiMmioSel bitmask value to 1 instead of 2

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Message-ID: <CAHh0gOgCr2Hnj4JvK1DBXQ58Lb3o5D_beptfVDTXzbRFf676Fw@mail.gmail.com>
Date:	Thu, 7 Mar 2013 21:17:32 +0900
From:	Tanaka Takahisa <mc74hc00@...il.com>
To:	Paul Menzel <paulepanter@...rs.sourceforge.net>
Cc:	linux-watchdog@...r.kernel.org, Wim Van Sebroeck <wim@...ana.be>,
	Arkadiusz Miskiewicz <arekm@...en.pl>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Nieder <jrnieder@...il.com>,
	linux-kernel@...r.kernel.org,
	Florian Mickler <florian@...kler.org>,
	Joseph Salisbury <joseph.salisbury@...onical.com>,
	Joseph Salisbury <josephtsalisbury@...il.com>
Subject: Re: [PATCH v2] sp5100_tco: Set the AcpiMmioSel bitmask value to 1
 instead of 2

Hi Paul,

2013/3/3 Paul Menzel <paulepanter@...rs.sourceforge.net>:
> From: Takahisa Tanaka <mc74hc00@...il.com>
> Date: Sun, 3 Mar 2013 14:48:00 +0900
>
> The AcpiMmioSel bit is bit 1 in the AcpiMmioEn register, but the current
> sp5100_tco driver is using bit 2.
>
> See 2.3.3 Power Management (PM) Registers page 150 of the
> AMD SB800-Series Southbridges Register Reference Guide [1].
>
>         AcpiMmioEn - RW – 8/16/32 bits - [PM_Reg: 24h]
>         Field Name        Bits  Default  Description
>         AcpiMMioDecodeEn  0     0b       Set to 1 to enable AcpiMMio space.
>         AcpiMMIoSel       1     0b       Set AcpiMMio registers to be memory-mapped or IO-mapped space.
>                                          0: Memory-mapped space
>                                          1: I/O-mapped space
>
> The sp5100_tco driver expects zero as a value of AcpiMmioSel (bit 1).
>
> Fortunately, no problems were caused by this typo, because the default
> value of the undocumented misused bit 2 seems to be zero.
>
> However, the sp5100_tco driver should use the correct bitmask value.
>
> [1] http://support.amd.com/us/Embedded_TechDocs/45482.pdf
>
> Signed-off-by: Takahisa Tanaka <mc74hc00@...il.com>
> CC: stable@...r.kernel.org
> Signed-off-by: Paul Menzel <paulepanter@...rs.sourceforge.net>
> ---
> v2: Hopefully improved the commit message.
>
>  drivers/watchdog/sp5100_tco.h |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/sp5100_tco.h b/drivers/watchdog/sp5100_tco.h
> index 71594a0..2b28c00 100644
> --- a/drivers/watchdog/sp5100_tco.h
> +++ b/drivers/watchdog/sp5100_tco.h
> @@ -57,7 +57,7 @@
>  #define SB800_PM_WATCHDOG_DISABLE      (1 << 2)
>  #define SB800_PM_WATCHDOG_SECOND_RES   (3 << 0)
>  #define SB800_ACPI_MMIO_DECODE_EN      (1 << 0)
> -#define SB800_ACPI_MMIO_SEL            (1 << 2)
> +#define SB800_ACPI_MMIO_SEL            (1 << 1)
>
>
>  #define SB800_PM_WDT_MMIO_OFFSET       0xB00
> --
> 1.7.10.4

I'm sorry for late reply.
Thank you for improving the commit log.


Regards,
Takahisa
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