Patch "ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications" has been added to the 4.2-stable tree

Patch "ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications" has been added to the 4.2-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications

to the 4.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm-dts-sunxi-raise-minimum-cpu-voltage-for-sun7i-a20-to-meet-soc-specifications.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From eaeef1ad9b6ea6df1d1220c254d9563da60cb9d1 Mon Sep 17 00:00:00 2001
From: Timo Sigurdsson <public_timo.s@silentcreek.de>
Date: Tue, 4 Aug 2015 23:08:01 +0200
Subject: ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications

From: Timo Sigurdsson <public_timo.s@silentcreek.de>

commit eaeef1ad9b6ea6df1d1220c254d9563da60cb9d1 upstream.

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.

Fixes: d96b7161916f ("ARM: dts: sun7i: Add cpu clock reference and operating points to dtsi")
Signed-off-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
Acked-by: Iain Paton <ipaton0@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/boot/dts/sun7i-a20.dtsi |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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>;


Patches currently in stable-queue which might be from public_timo.s@silentcreek.de are

queue-4.2/arm-dts-sunxi-raise-minimum-cpu-voltage-for-sun7i-a20-to-meet-soc-specifications.patch

Re: Patch "ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications" has been added to the 4.2-stable tree

[Timo Sigurdsson]

Hi Greg,

I don't know your exact workflow, but is it possible that you missed this patch
to apply it to the 4.1 tree? IIRC Maxime marked this as "4.0+" when he forwarded
it to stable. But while it went into 4.2.4, it's not in 4.1.11 or 4.1.12-rc1.

Thanks,

Timo


gregkh@linuxfoundation.org schrieb am 13.10.2015 22:39:

> 
> This is a note to let you know that I've just added the patch titled
> 
>    ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC
>    specifications
> 
> to the 4.2-stable tree which can be found at:
>    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> 
> The filename of the patch is:
>     arm-dts-sunxi-raise-minimum-cpu-voltage-for-sun7i-a20-to-meet-soc-specifications.patch
> and it can be found in the queue-4.2 subdirectory.
> 
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@vger.kernel.org> know about it.
> 
> 
>>>From eaeef1ad9b6ea6df1d1220c254d9563da60cb9d1 Mon Sep 17 00:00:00 2001
> From: Timo Sigurdsson <public_timo.s@silentcreek.de>
> Date: Tue, 4 Aug 2015 23:08:01 +0200
> Subject: ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC
> specifications
> 
> From: Timo Sigurdsson <public_timo.s@silentcreek.de>
> 
> commit eaeef1ad9b6ea6df1d1220c254d9563da60cb9d1 upstream.
> 
> 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.
> 
> Fixes: d96b7161916f ("ARM: dts: sun7i: Add cpu clock reference and operating
> points to dtsi")
> Signed-off-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
> Acked-by: Iain Paton <ipaton0@gmail.com>
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> 
> ---
> arch/arm/boot/dts/sun7i-a20.dtsi |    2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- 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>;
> 
> 
> Patches currently in stable-queue which might be from
> public_timo.s@silentcreek.de are
> 
> queue-4.2/arm-dts-sunxi-raise-minimum-cpu-voltage-for-sun7i-a20-to-meet-soc-specifications.patch
> 

Re: Patch "ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications" has been added to the 4.2-stable tree

[Greg KH]

On Mon, Oct 26, 2015 at 10:12:24AM +0100, Timo Sigurdsson wrote:
> Hi Greg,
> 
> I don't know your exact workflow, but is it possible that you missed this patch
> to apply it to the 4.1 tree? IIRC Maxime marked this as "4.0+" when he forwarded
> it to stable. But while it went into 4.2.4, it's not in 4.1.11 or 4.1.12-rc1.


Does it apply to 4.1-stable?  Maybe I dropped it because it didn't do
so, please test it and see...

thanks,

greg k-h

Re: Patch "ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications" has been added to the 4.2-stable tree

[Timo Sigurdsson]

Hi Greg,

Am Dienstag, den 27.10.2015, 05:42 +0900 schrieb Greg KH:
> On Mon, Oct 26, 2015 at 10:12:24AM +0100, Timo Sigurdsson wrote:
> > Hi Greg,
> > 
> > I don't know your exact workflow, but is it possible that you missed this patch
> > to apply it to the 4.1 tree? IIRC Maxime marked this as "4.0+" when he forwarded
> > it to stable. But while it went into 4.2.4, it's not in 4.1.11 or 4.1.12-rc1.
> 
> 
> Does it apply to 4.1-stable?  Maybe I dropped it because it didn't do
> so, please test it and see...
> 
> thanks,
> 
> greg k-h

Oops, you're right. The patch didn't apply. Here's a backported version for
the linux-4.1.y tree, tested on top of 4.1.12.

Regards,

Timo

--
>From a2f5b3a592d5d86b4579fc03a1c8fecf74f26e4c Mon Sep 17 00:00:00 2001
From: Timo Sigurdsson <public_timo.s@silentcreek.de>
Date: Tue, 27 Oct 2015 21:09:28 +0100
Subject: [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to
 meet SoC specifications

Backport of commit eaeef1ad9b6e ("ARM: dts: sunxi: Raise minimum CPU
voltage for sun7i-a20 to meet SoC specifications") upstream.

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.

Fixes: d96b7161916f ("ARM: dts: sun7i: Add cpu clock reference and
 operating points to dtsi")
Signed-off-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
Acked-by: Iain Paton <ipaton0@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 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 2b4847c..fa36571 100644
--- a/arch/arm/boot/dts/sun7i-a20.dtsi
+++ b/arch/arm/boot/dts/sun7i-a20.dtsi
@@ -111,7 +111,7 @@
 				720000  1200000
 				528000  1100000
 				312000  1000000
-				144000  900000
+				144000  1000000
 				>;
 			#cooling-cells = <2>;
 			cooling-min-level = <0>;
-- 
2.1.4

Re: Patch "ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications" has been added to the 4.2-stable tree

[Greg KH]

On Tue, Oct 27, 2015 at 09:56:43PM +0100, Timo Sigurdsson wrote:
> Hi Greg,
> 
> Am Dienstag, den 27.10.2015, 05:42 +0900 schrieb Greg KH:
> > On Mon, Oct 26, 2015 at 10:12:24AM +0100, Timo Sigurdsson wrote:
> > > Hi Greg,
> > > 
> > > I don't know your exact workflow, but is it possible that you missed this patch
> > > to apply it to the 4.1 tree? IIRC Maxime marked this as "4.0+" when he forwarded
> > > it to stable. But while it went into 4.2.4, it's not in 4.1.11 or 4.1.12-rc1.
> > 
> > 
> > Does it apply to 4.1-stable?  Maybe I dropped it because it didn't do
> > so, please test it and see...
> > 
> > thanks,
> > 
> > greg k-h
> 
> Oops, you're right. The patch didn't apply. Here's a backported version for
> the linux-4.1.y tree, tested on top of 4.1.12.

Thanks, now queued up.

greg k-h