From: maxime.ripard@free-electrons.com (Maxime Ripard)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications
Date: Mon, 17 Aug 2015 17:18:51 +0200 [thread overview]
Message-ID: <20150817151851.GE2547@lukather> (raw)
In-Reply-To: <1438722481-2302-1-git-send-email-public_timo.s@silentcreek.de>
Hi Timo,
On Tue, Aug 04, 2015 at 11:08:01PM +0200, 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>
Added Iain's Ack, and Cc stable
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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WARNING: multiple messages have this Message-ID (diff)
From: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
To: Timo Sigurdsson <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,
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: Mon, 17 Aug 2015 17:18:51 +0200 [thread overview]
Message-ID: <20150817151851.GE2547@lukather> (raw)
In-Reply-To: <1438722481-2302-1-git-send-email-public_timo.s-fWgRPtSzPNU3WX+qO2AYSQ@public.gmane.org>
[-- Attachment #1: Type: text/plain, Size: 672 bytes --]
Hi Timo,
On Tue, Aug 04, 2015 at 11:08:01PM +0200, 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>
Added Iain's Ack, and Cc stable
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
WARNING: multiple messages have this Message-ID (diff)
From: Maxime Ripard <maxime.ripard@free-electrons.com>
To: Timo Sigurdsson <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, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com,
wens@csie.org
Subject: Re: [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications
Date: Mon, 17 Aug 2015 17:18:51 +0200 [thread overview]
Message-ID: <20150817151851.GE2547@lukather> (raw)
In-Reply-To: <1438722481-2302-1-git-send-email-public_timo.s@silentcreek.de>
[-- Attachment #1: Type: text/plain, Size: 668 bytes --]
Hi Timo,
On Tue, Aug 04, 2015 at 11:08:01PM +0200, 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>
Added Iain's Ack, and Cc stable
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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next prev parent reply other threads:[~2015-08-17 15:18 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 ` [linux-sunxi] " Iain Paton
2015-08-09 22:58 ` Iain Paton
2015-08-09 22:58 ` Iain Paton
2015-08-17 15:18 ` Maxime Ripard [this message]
2015-08-17 15:18 ` Maxime Ripard
2015-08-17 15:18 ` Maxime Ripard
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