From: ipaton0@gmail.com (Iain Paton)
To: linux-arm-kernel@lists.infradead.org
Subject: [linux-sunxi] [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications
Date: Sun, 09 Aug 2015 23:58:55 +0100 [thread overview]
Message-ID: <55C7DB2F.5080907@gmail.com> (raw)
In-Reply-To: <1438722481-2302-1-git-send-email-public_timo.s@silentcreek.de>
Acked-by: Iain Paton <ipaton0@gmail.com>
On 04/08/15 22:08, Timo Sigurdsson wrote:
> sun7i-a20.dtsi contains a cpufreq operating point at 0.9 volts. The minimum
> CPU voltage for the Allwinner A20 SoC, however, is 1.0 volts. Thus, raise
> the voltage for the lowest operating point to 1.0 volts in order to stay
> within the SoC specifications. It is an undervolted setting that isn't
> stable across all SoCs and boards out there.
>
> Signed-off-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
> ---
> Changes since v1:
>
> - Fixed checkpatch warnings
> - Changed the commit message and title to clarify that this is not a board-specific issue, but rather a limitation by the SoC
> ---
> arch/arm/boot/dts/sun7i-a20.dtsi | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
> index 6a63f30..f5f384c 100644
> --- a/arch/arm/boot/dts/sun7i-a20.dtsi
> +++ b/arch/arm/boot/dts/sun7i-a20.dtsi
> @@ -107,7 +107,7 @@
> 720000 1200000
> 528000 1100000
> 312000 1000000
> - 144000 900000
> + 144000 1000000
> >;
> #cooling-cells = <2>;
> cooling-min-level = <0>;
>
WARNING: multiple messages have this Message-ID (diff)
From: Iain Paton <ipaton0-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: public_timo.s-fWgRPtSzPNU3WX+qO2AYSQ@public.gmane.org
Cc: robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
pawel.moll-5wv7dgnIgG8@public.gmane.org,
mark.rutland-5wv7dgnIgG8@public.gmane.org,
ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org,
galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org,
maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org,
wens-jdAy2FN1RRM@public.gmane.org
Subject: Re: [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications
Date: Sun, 09 Aug 2015 23:58:55 +0100 [thread overview]
Message-ID: <55C7DB2F.5080907@gmail.com> (raw)
In-Reply-To: <1438722481-2302-1-git-send-email-public_timo.s-fWgRPtSzPNU3WX+qO2AYSQ@public.gmane.org>
Acked-by: Iain Paton <ipaton0-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
On 04/08/15 22:08, Timo Sigurdsson wrote:
> sun7i-a20.dtsi contains a cpufreq operating point at 0.9 volts. The minimum
> CPU voltage for the Allwinner A20 SoC, however, is 1.0 volts. Thus, raise
> the voltage for the lowest operating point to 1.0 volts in order to stay
> within the SoC specifications. It is an undervolted setting that isn't
> stable across all SoCs and boards out there.
>
> Signed-off-by: Timo Sigurdsson <public_timo.s-fWgRPtSzPNU3WX+qO2AYSQ@public.gmane.org>
> ---
> Changes since v1:
>
> - Fixed checkpatch warnings
> - Changed the commit message and title to clarify that this is not a board-specific issue, but rather a limitation by the SoC
> ---
> arch/arm/boot/dts/sun7i-a20.dtsi | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
> index 6a63f30..f5f384c 100644
> --- a/arch/arm/boot/dts/sun7i-a20.dtsi
> +++ b/arch/arm/boot/dts/sun7i-a20.dtsi
> @@ -107,7 +107,7 @@
> 720000 1200000
> 528000 1100000
> 312000 1000000
> - 144000 900000
> + 144000 1000000
> >;
> #cooling-cells = <2>;
> cooling-min-level = <0>;
>
WARNING: multiple messages have this Message-ID (diff)
From: Iain Paton <ipaton0@gmail.com>
To: public_timo.s@silentcreek.de
Cc: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com,
ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
linux@arm.linux.org.uk, maxime.ripard@free-electrons.com,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com,
wens@csie.org
Subject: Re: [linux-sunxi] [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications
Date: Sun, 09 Aug 2015 23:58:55 +0100 [thread overview]
Message-ID: <55C7DB2F.5080907@gmail.com> (raw)
In-Reply-To: <1438722481-2302-1-git-send-email-public_timo.s@silentcreek.de>
Acked-by: Iain Paton <ipaton0@gmail.com>
On 04/08/15 22:08, Timo Sigurdsson wrote:
> sun7i-a20.dtsi contains a cpufreq operating point at 0.9 volts. The minimum
> CPU voltage for the Allwinner A20 SoC, however, is 1.0 volts. Thus, raise
> the voltage for the lowest operating point to 1.0 volts in order to stay
> within the SoC specifications. It is an undervolted setting that isn't
> stable across all SoCs and boards out there.
>
> Signed-off-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
> ---
> Changes since v1:
>
> - Fixed checkpatch warnings
> - Changed the commit message and title to clarify that this is not a board-specific issue, but rather a limitation by the SoC
> ---
> arch/arm/boot/dts/sun7i-a20.dtsi | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
> index 6a63f30..f5f384c 100644
> --- a/arch/arm/boot/dts/sun7i-a20.dtsi
> +++ b/arch/arm/boot/dts/sun7i-a20.dtsi
> @@ -107,7 +107,7 @@
> 720000 1200000
> 528000 1100000
> 312000 1000000
> - 144000 900000
> + 144000 1000000
> >;
> #cooling-cells = <2>;
> cooling-min-level = <0>;
>
next prev parent reply other threads:[~2015-08-09 22:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-04 21:08 [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications Timo Sigurdsson
2015-08-04 21:08 ` Timo Sigurdsson
2015-08-04 21:08 ` Timo Sigurdsson
2015-08-09 22:58 ` Iain Paton [this message]
2015-08-09 22:58 ` [linux-sunxi] " Iain Paton
2015-08-09 22:58 ` Iain Paton
2015-08-17 15:18 ` Maxime Ripard
2015-08-17 15:18 ` Maxime Ripard
2015-08-17 15:18 ` Maxime Ripard
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