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| Started by | Timo Sigurdsson <public_timo.s@silentcreek.de> |
|---|---|
| First post | 2015-08-04 23:10 +0200 |
| Last post | 2015-08-17 17:20 +0200 |
| Articles | 3 — 3 participants |
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[PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications Timo Sigurdsson <public_timo.s@silentcreek.de> - 2015-08-04 23:10 +0200
Re: [linux-sunxi] [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications Iain Paton <ipaton0@gmail.com> - 2015-08-10 01:00 +0200
Re: [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-08-17 17:20 +0200
| From | Timo Sigurdsson <public_timo.s@silentcreek.de> |
|---|---|
| Date | 2015-08-04 23:10 +0200 |
| Subject | [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications |
| Message-ID | <pTRDc-5x3-19@gated-at.bofh.it> |
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>; -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Iain Paton <ipaton0@gmail.com> |
|---|---|
| Date | 2015-08-10 01:00 +0200 |
| Subject | Re: [linux-sunxi] [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications |
| Message-ID | <pVHJn-3eQ-9@gated-at.bofh.it> |
| In reply to | #1200280 |
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>; > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Maxime Ripard <maxime.ripard@free-electrons.com> |
|---|---|
| Date | 2015-08-17 17:20 +0200 |
| Subject | Re: [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications |
| Message-ID | <pYumC-2Ed-15@gated-at.bofh.it> |
| In reply to | #1200280 |
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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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