Re: [PATCH v2] ARM: dts: sun8i: add opp-v2 table for A33

Re: [PATCH v2] ARM: dts: sun8i: add opp-v2 table for A33

[Maxime Ripard]

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On Fri, Dec 16, 2016 at 02:27:54AM +0800, Icenowy Zheng wrote:
> An operating point table is needed for the cpu frequency adjusting to
> work.
> 
> The operating point table is converted from the common value in
> extracted script.fex from many A33 board/tablets.
> 
> Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
> ---
> Changes since v1:
> - Fix format problem (blank lines).
> - Removed the 1.344GHz operating point, as it's overvoltage and overclocked.
> 
> This patch depends on the following patchset:
> 
> http://lists.infradead.org/pipermail/linux-arm-kernel/2016-December/473962.html
> 
> It's the v2 of the [PATCH 4/6] in this patchset.
> 
> I think this operating point table may also apply to A23, as there's no
> difference except the points over 1.2GHz between A23 and A33's stock dvfs table.
> 
> But as A23 CCU may not have the necessary fixes, I won't add the table to A23
> now.
> 
> Chen-Yu, could you test the CCU fixes I described in the patchset above on A23,
> then test this operating points table?
> 
> If it's necessary, you can send out the CCU fixes and add one more patch that
> moves this opp-v2 table to sun8i-a23-a33.dtsi .
> 
>  arch/arm/boot/dts/sun8i-a33.dtsi | 35 +++++++++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun8i-a33.dtsi b/arch/arm/boot/dts/sun8i-a33.dtsi
> index 504996cbee29..0f5b2af72981 100644
> --- a/arch/arm/boot/dts/sun8i-a33.dtsi
> +++ b/arch/arm/boot/dts/sun8i-a33.dtsi
> @@ -46,7 +46,42 @@
>  #include <dt-bindings/dma/sun4i-a10.h>
>  
>  / {
> +	cpu0_opp_table: opp_table0 {
> +		compatible = "operating-points-v2";
> +		opp-shared;
> +
> +		opp@648000000 {
> +			opp-hz = /bits/ 64 <648000000>;
> +			opp-microvolt = <1040000>;
> +			clock-latency-ns = <244144>; /* 8 32k periods */
> +		};
> +
> +		opp@816000000 {
> +			opp-hz = /bits/ 64 <816000000>;
> +			opp-microvolt = <1100000>;
> +			clock-latency-ns = <244144>; /* 8 32k periods */
> +		};
> +
> +		opp@1008000000 {
> +			opp-hz = /bits/ 64 <1008000000>;
> +			opp-microvolt = <1200000>;
> +			clock-latency-ns = <244144>; /* 8 32k periods */
> +		};
> +
> +		opp@1200000000 {
> +			opp-hz = /bits/ 64 <1200000000>;
> +			opp-microvolt = <1320000>;
> +			clock-latency-ns = <244144>; /* 8 32k periods */
> +		};
> +	};
> +
>  	cpus {
> +		cpu0: cpu@0 {

There's no need to duplicate the label here. I removed it and applied.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH v2] ARM: dts: sun8i: add opp-v2 table for A33

[Chen-Yu Tsai]

On Mon, Dec 19, 2016 at 4:46 PM, Maxime Ripard
<maxime.ripard@free-electrons.com> wrote:
> On Fri, Dec 16, 2016 at 02:27:54AM +0800, Icenowy Zheng wrote:
>> An operating point table is needed for the cpu frequency adjusting to
>> work.
>>
>> The operating point table is converted from the common value in
>> extracted script.fex from many A33 board/tablets.
>>
>> Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
>> ---
>> Changes since v1:
>> - Fix format problem (blank lines).
>> - Removed the 1.344GHz operating point, as it's overvoltage and overclocked.
>>
>> This patch depends on the following patchset:
>>
>> http://lists.infradead.org/pipermail/linux-arm-kernel/2016-December/473962.html
>>
>> It's the v2 of the [PATCH 4/6] in this patchset.
>>
>> I think this operating point table may also apply to A23, as there's no
>> difference except the points over 1.2GHz between A23 and A33's stock dvfs table.
>>
>> But as A23 CCU may not have the necessary fixes, I won't add the table to A23
>> now.
>>
>> Chen-Yu, could you test the CCU fixes I described in the patchset above on A23,
>> then test this operating points table?
>>
>> If it's necessary, you can send out the CCU fixes and add one more patch that
>> moves this opp-v2 table to sun8i-a23-a33.dtsi .
>>
>>  arch/arm/boot/dts/sun8i-a33.dtsi | 35 +++++++++++++++++++++++++++++++++++
>>  1 file changed, 35 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/sun8i-a33.dtsi b/arch/arm/boot/dts/sun8i-a33.dtsi
>> index 504996cbee29..0f5b2af72981 100644
>> --- a/arch/arm/boot/dts/sun8i-a33.dtsi
>> +++ b/arch/arm/boot/dts/sun8i-a33.dtsi
>> @@ -46,7 +46,42 @@
>>  #include <dt-bindings/dma/sun4i-a10.h>
>>
>>  / {
>> +     cpu0_opp_table: opp_table0 {
>> +             compatible = "operating-points-v2";
>> +             opp-shared;
>> +
>> +             opp@648000000 {
>> +                     opp-hz = /bits/ 64 <648000000>;
>> +                     opp-microvolt = <1040000>;
>> +                     clock-latency-ns = <244144>; /* 8 32k periods */
>> +             };
>> +
>> +             opp@816000000 {
>> +                     opp-hz = /bits/ 64 <816000000>;
>> +                     opp-microvolt = <1100000>;
>> +                     clock-latency-ns = <244144>; /* 8 32k periods */
>> +             };
>> +
>> +             opp@1008000000 {
>> +                     opp-hz = /bits/ 64 <1008000000>;
>> +                     opp-microvolt = <1200000>;
>> +                     clock-latency-ns = <244144>; /* 8 32k periods */
>> +             };
>> +
>> +             opp@1200000000 {
>> +                     opp-hz = /bits/ 64 <1200000000>;
>> +                     opp-microvolt = <1320000>;
>> +                     clock-latency-ns = <244144>; /* 8 32k periods */
>> +             };
>> +     };
>> +
>>       cpus {
>> +             cpu0: cpu@0 {
>
> There's no need to duplicate the label here. I removed it and applied.

I think using the label to directly reference cpu0 would be better,
instead of duplicating the cpu@0 block.

ChenYu

Re: [PATCH v2] ARM: dts: sun8i: add opp-v2 table for A33

[Quentin Schulz]

Hi,

On 19/12/2016 15:06, Icenowy Zheng wrote:
> 
> After proper testing of A23 ccu, the operating points can also apply to A23.
> (According to A23 devices' fex)
> 

I disagree. I've looked into using the same operating points for A23 and
A33 for CPUfreq and I came to the conclusion that not all A23-based
boards share the same operating points. You can find the fex files for
the different boards here:
https://github.com/linux-sunxi/sunxi-boards/tree/master/sys_config/a23

After gathering all supported frequencies/voltages for each A23-based
boards, I found that only the following frequencies and voltages are
supported by all A23-based boards:

 - 1008 MHz, 1220 mV
 - 816 MHz, 1120 mV
 - 600 MHz, 1040 mV

Quentin

-- 
Quentin Schulz, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

Re: [PATCH v2] ARM: dts: sun8i: add opp-v2 table for A33

[Quentin Schulz]

On 19/12/2016 15:06, Icenowy Zheng wrote:
> 
> 
> 19.12.2016, 16:54, "Chen-Yu Tsai" <wens@csie.org>:
>> On Mon, Dec 19, 2016 at 4:46 PM, Maxime Ripard
>> <maxime.ripard@free-electrons.com> wrote:
>>>  On Fri, Dec 16, 2016 at 02:27:54AM +0800, Icenowy Zheng wrote:
>>>>  An operating point table is needed for the cpu frequency adjusting to
>>>>  work.
>>>>
>>>>  The operating point table is converted from the common value in
>>>>  extracted script.fex from many A33 board/tablets.
>>>>
>>>>  Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
>>>>  ---
>>>>  Changes since v1:
>>>>  - Fix format problem (blank lines).
>>>>  - Removed the 1.344GHz operating point, as it's overvoltage and overclocked.
>>>>
>>>>  This patch depends on the following patchset:
>>>>
>>>>  http://lists.infradead.org/pipermail/linux-arm-kernel/2016-December/473962.html
>>>>
>>>>  It's the v2 of the [PATCH 4/6] in this patchset.
>>>>
>>>>  I think this operating point table may also apply to A23, as there's no
>>>>  difference except the points over 1.2GHz between A23 and A33's stock dvfs table.
>>>>
>>>>  But as A23 CCU may not have the necessary fixes, I won't add the table to A23
>>>>  now.
>>>>
>>>>  Chen-Yu, could you test the CCU fixes I described in the patchset above on A23,
>>>>  then test this operating points table?
>>>>
>>>>  If it's necessary, you can send out the CCU fixes and add one more patch that
>>>>  moves this opp-v2 table to sun8i-a23-a33.dtsi .
>>>>
>>>>   arch/arm/boot/dts/sun8i-a33.dtsi | 35 +++++++++++++++++++++++++++++++++++
>>>>   1 file changed, 35 insertions(+)
>>>>
>>>>  diff --git a/arch/arm/boot/dts/sun8i-a33.dtsi b/arch/arm/boot/dts/sun8i-a33.dtsi
>>>>  index 504996cbee29..0f5b2af72981 100644
>>>>  --- a/arch/arm/boot/dts/sun8i-a33.dtsi
>>>>  +++ b/arch/arm/boot/dts/sun8i-a33.dtsi
>>>>  @@ -46,7 +46,42 @@
>>>>   #include <dt-bindings/dma/sun4i-a10.h>
>>>>
>>>>   / {
>>>>  + cpu0_opp_table: opp_table0 {
>>>>  + compatible = "operating-points-v2";
>>>>  + opp-shared;
>>>>  +
>>>>  + opp@648000000 {
>>>>  + opp-hz = /bits/ 64 <648000000>;
>>>>  + opp-microvolt = <1040000>;
>>>>  + clock-latency-ns = <244144>; /* 8 32k periods */
>>>>  + };
>>>>  +
>>>>  + opp@816000000 {
>>>>  + opp-hz = /bits/ 64 <816000000>;
>>>>  + opp-microvolt = <1100000>;
>>>>  + clock-latency-ns = <244144>; /* 8 32k periods */
>>>>  + };
>>>>  +
>>>>  + opp@1008000000 {
>>>>  + opp-hz = /bits/ 64 <1008000000>;
>>>>  + opp-microvolt = <1200000>;
>>>>  + clock-latency-ns = <244144>; /* 8 32k periods */
>>>>  + };
>>>>  +
>>>>  + opp@1200000000 {
>>>>  + opp-hz = /bits/ 64 <1200000000>;
>>>>  + opp-microvolt = <1320000>;
>>>>  + clock-latency-ns = <244144>; /* 8 32k periods */
>>>>  + };
>>>>  + };
>>>>  +

Also, there are a lot more operating points for the A33, see:
https://github.com/QSchulz/linux/blob/v4.9-rc4_adc_a31_v7/cpufreq_a33/arch/arm/boot/dts/sun8i-a33.dtsi#L323-L340

They are present in the Allwinner Linux source code and in the fex of
all A33-based boards.

Is there a reason for not adding all opp?

Quentin

-- 
Quentin Schulz, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com