[PATCH] ARM: dts: add 533 MHz step to p4note GPU opp table

[PATCH] ARM: dts: add 533 MHz step to p4note GPU opp table

[Martin Jücker]

The p4note devices support 533 MHz GPU speed, so let's make use of it.

Signed-off-by: Martin Jücker <martin.juecker@gmail.com>
---
 arch/arm/boot/dts/exynos4412-p4note.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/exynos4412-p4note.dtsi b/arch/arm/boot/dts/exynos4412-p4note.dtsi
index 4ae6eb3091c4..d277b2337ae0 100644
--- a/arch/arm/boot/dts/exynos4412-p4note.dtsi
+++ b/arch/arm/boot/dts/exynos4412-p4note.dtsi
@@ -355,6 +355,13 @@ &gpu {
 	status = "okay";
 };
 
+&gpu_opp_table {
+	opp-533000000 {
+		opp-hz = /bits/ 64 <533000000>;
+		opp-microvolt = <1075000>;
+	};
+};
+
 &hsotg {
 	vusb_a-supply = <&ldo12_reg>;
 	dr_mode = "peripheral";
-- 
2.25.1


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Re: [PATCH] ARM: dts: add 533 MHz step to p4note GPU opp table

[Krzysztof Kozlowski]

On 29/01/2022 23:14, Martin Jücker wrote:
> The p4note devices support 533 MHz GPU speed, so let's make use of it.
> 

If there is going to be resend, please add prefix "exynos:" in subject.
Just like other commits (git log --oneline arch/arm/boot/dts/exynos*).

> Signed-off-by: Martin Jücker <martin.juecker@gmail.com>
> ---
>  arch/arm/boot/dts/exynos4412-p4note.dtsi | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/exynos4412-p4note.dtsi b/arch/arm/boot/dts/exynos4412-p4note.dtsi
> index 4ae6eb3091c4..d277b2337ae0 100644
> --- a/arch/arm/boot/dts/exynos4412-p4note.dtsi
> +++ b/arch/arm/boot/dts/exynos4412-p4note.dtsi
> @@ -355,6 +355,13 @@ &gpu {
>  	status = "okay";
>  };
>  
> +&gpu_opp_table {
> +	opp-533000000 {
> +		opp-hz = /bits/ 64 <533000000>;
> +		opp-microvolt = <1075000>;
> +	};
> +};

This looks like Exynos4412 Prime. Please check also CPU frequencies and
if they match, just include exynos4412-prime.dtsi (like Odroid U3).

> +
>  &hsotg {
>  	vusb_a-supply = <&ldo12_reg>;
>  	dr_mode = "peripheral";


Best regards,
Krzysztof

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Re: [PATCH] ARM: dts: add 533 MHz step to p4note GPU opp table

[Martin Jücker]

On Mon, Jan 31, 2022 at 09:54:00AM +0100, Krzysztof Kozlowski wrote:
> On 29/01/2022 23:14, Martin Jücker wrote:
> > The p4note devices support 533 MHz GPU speed, so let's make use of it.
> > 
> 
> If there is going to be resend, please add prefix "exynos:" in subject.
> Just like other commits (git log --oneline arch/arm/boot/dts/exynos*).
> 

Okay.

> > Signed-off-by: Martin Jücker <martin.juecker@gmail.com>
> > ---
> >  arch/arm/boot/dts/exynos4412-p4note.dtsi | 7 +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/exynos4412-p4note.dtsi b/arch/arm/boot/dts/exynos4412-p4note.dtsi
> > index 4ae6eb3091c4..d277b2337ae0 100644
> > --- a/arch/arm/boot/dts/exynos4412-p4note.dtsi
> > +++ b/arch/arm/boot/dts/exynos4412-p4note.dtsi
> > @@ -355,6 +355,13 @@ &gpu {
> >  	status = "okay";
> >  };
> >  
> > +&gpu_opp_table {
> > +	opp-533000000 {
> > +		opp-hz = /bits/ 64 <533000000>;
> > +		opp-microvolt = <1075000>;
> > +	};
> > +};
> 
> This looks like Exynos4412 Prime. Please check also CPU frequencies and
> if they match, just include exynos4412-prime.dtsi (like Odroid U3).
> 

I thought so as well, but unfortunately it's not. The chip id is
0xe4412211 and according to the vendor kernel, the prime version would
need to have the last two digits being 0x20 or higher. See:

https://github.com/Viciouss/samsung_p4note_kernel_backup/blob/da306e1846bb4b9682f46be1b23b05d6fbebffba/arch/arm/mach-exynos/cpufreq-4x12.c#L619

On the other hand, this kernel has the 533 MHz step unlocked for all
versions:

https://github.com/Viciouss/samsung_p4note_kernel_backup/blob/da306e1846bb4b9682f46be1b23b05d6fbebffba/drivers/gpu/mali400/r3p2/mali/platform/pegasus-m400/exynos4_pmm.c#L88

> > +
> >  &hsotg {
> >  	vusb_a-supply = <&ldo12_reg>;
> >  	dr_mode = "peripheral";
> 
> 
> Best regards,
> Krzysztof

Kind Regards
Martin

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Re: [PATCH] ARM: dts: add 533 MHz step to p4note GPU opp table

[Martin Jücker]

On Mon, Jan 31, 2022 at 09:54:00AM +0100, Krzysztof Kozlowski wrote:
> On 29/01/2022 23:14, Martin Jücker wrote:
> > The p4note devices support 533 MHz GPU speed, so let's make use of it.
> > 
> 
> If there is going to be resend, please add prefix "exynos:" in subject.
> Just like other commits (git log --oneline arch/arm/boot/dts/exynos*).
> 
> > Signed-off-by: Martin Jücker <martin.juecker@gmail.com>
> > ---
> >  arch/arm/boot/dts/exynos4412-p4note.dtsi | 7 +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/exynos4412-p4note.dtsi b/arch/arm/boot/dts/exynos4412-p4note.dtsi
> > index 4ae6eb3091c4..d277b2337ae0 100644
> > --- a/arch/arm/boot/dts/exynos4412-p4note.dtsi
> > +++ b/arch/arm/boot/dts/exynos4412-p4note.dtsi
> > @@ -355,6 +355,13 @@ &gpu {
> >  	status = "okay";
> >  };
> >  
> > +&gpu_opp_table {
> > +	opp-533000000 {
> > +		opp-hz = /bits/ 64 <533000000>;
> > +		opp-microvolt = <1075000>;
> > +	};
> > +};
> 
> This looks like Exynos4412 Prime. Please check also CPU frequencies and
> if they match, just include exynos4412-prime.dtsi (like Odroid U3).
> 
> > +
> >  &hsotg {
> >  	vusb_a-supply = <&ldo12_reg>;
> >  	dr_mode = "peripheral";
> 
> 
> Best regards,
> Krzysztof

I just noticed, that I overlooked a condition in the code which
decreases the step count by one which eliminates the 533 MHz step.
Please ignore this patch.

Kind Regards
Martin

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Re: [PATCH] ARM: dts: add 533 MHz step to p4note GPU opp table

[Krzysztof Kozlowski]

On 31/01/2022 13:15, Martin Jücker wrote:
> On Mon, Jan 31, 2022 at 09:54:00AM +0100, Krzysztof Kozlowski wrote:
>> On 29/01/2022 23:14, Martin Jücker wrote:
>>> The p4note devices support 533 MHz GPU speed, so let's make use of it.
>>>
>>
>> If there is going to be resend, please add prefix "exynos:" in subject.
>> Just like other commits (git log --oneline arch/arm/boot/dts/exynos*).
>>
>>> Signed-off-by: Martin Jücker <martin.juecker@gmail.com>
>>> ---
>>>  arch/arm/boot/dts/exynos4412-p4note.dtsi | 7 +++++++
>>>  1 file changed, 7 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/exynos4412-p4note.dtsi b/arch/arm/boot/dts/exynos4412-p4note.dtsi
>>> index 4ae6eb3091c4..d277b2337ae0 100644
>>> --- a/arch/arm/boot/dts/exynos4412-p4note.dtsi
>>> +++ b/arch/arm/boot/dts/exynos4412-p4note.dtsi
>>> @@ -355,6 +355,13 @@ &gpu {
>>>  	status = "okay";
>>>  };
>>>  
>>> +&gpu_opp_table {
>>> +	opp-533000000 {
>>> +		opp-hz = /bits/ 64 <533000000>;
>>> +		opp-microvolt = <1075000>;
>>> +	};
>>> +};
>>
>> This looks like Exynos4412 Prime. Please check also CPU frequencies and
>> if they match, just include exynos4412-prime.dtsi (like Odroid U3).
>>
>>> +
>>>  &hsotg {
>>>  	vusb_a-supply = <&ldo12_reg>;
>>>  	dr_mode = "peripheral";
>>
>>
>> Best regards,
>> Krzysztof
> 
> I just noticed, that I overlooked a condition in the code which
> decreases the step count by one which eliminates the 533 MHz step.
> Please ignore this patch.

Yeah:
	if(samsung_rev() < EXYNOS4412_REV_2_0)
		step_num = MALI_DVFS_STEPS - 1;

Your case, although possible, would be unlikely.

Best regards,
Krzysztof

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