[PATCH 1/2] dt-bindings: gpu: add Exynos Mali vendor specifics

[PATCH 1/2] dt-bindings: gpu: add Exynos Mali vendor specifics

[Joseph Kogut]

Document vendor specific compatible string for Mali gpus on Exynos SoCs.

Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
---
 Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
index 1b1a74129141..a9704c736d07 100644
--- a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
+++ b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
@@ -18,6 +18,7 @@ Required properties:
     + "amlogic,meson-gxm-mali"
     + "rockchip,rk3288-mali"
     + "rockchip,rk3399-mali"
+    + "samsung,exynos-mali"
 
 - reg : Physical base address of the device and length of the register area.
 
-- 
2.22.0


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[PATCH 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Joseph Kogut]

Add device tree node for mali gpu on Odroid XU3 SoCs.

Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
---
 .../boot/dts/exynos5422-odroidxu3-common.dtsi  | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
index 93a48f2dda49..1f2ae19d01af 100644
--- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
+++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
@@ -48,6 +48,24 @@
 		cooling-levels = <0 130 170 230>;
 	};
 
+	gpu: gpu@11800000 {
+		compatible = "samsung,exynos-mali", "arm,mali-t628";
+		reg = <0x11800000 0x5000>;
+		interrupts = <0 117 0>,
+			     <0 219 0>,
+			     <0 74  0>;
+		interrupt-names = "gpu", "job", "mmu";
+		clocks = <&clock CLK_G3D>,
+			 <&clock CLK_DOUT_ACLK_G3D>,
+			 <&clock CLK_FOUT_VPLL>;
+		mali-supply = <&buck4_reg>;
+		operating-points = <
+			/* KHz  uV   */
+			600000  1150000
+			177000  812500
+		>;
+	};
+
 	thermal-zones {
 		cpu0_thermal: cpu0-thermal {
 			thermal-sensors = <&tmu_cpu0 0>;
-- 
2.22.0


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Re: [PATCH 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Rob Herring]

On Fri, Jun 14, 2019 at 2:31 PM Joseph Kogut <joseph.kogut@gmail.com> wrote:
>
> Add device tree node for mali gpu on Odroid XU3 SoCs.
>
> Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> ---
>  .../boot/dts/exynos5422-odroidxu3-common.dtsi  | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> index 93a48f2dda49..1f2ae19d01af 100644
> --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> @@ -48,6 +48,24 @@
>                 cooling-levels = <0 130 170 230>;
>         };
>
> +       gpu: gpu@11800000 {
> +               compatible = "samsung,exynos-mali", "arm,mali-t628";
> +               reg = <0x11800000 0x5000>;
> +               interrupts = <0 117 0>,
> +                            <0 219 0>,
> +                            <0 74  0>;
> +               interrupt-names = "gpu", "job", "mmu";

Please use the order defined in the binding doc.

> +               clocks = <&clock CLK_G3D>,
> +                        <&clock CLK_DOUT_ACLK_G3D>,
> +                        <&clock CLK_FOUT_VPLL>;

The binding doc says a single clock.

> +               mali-supply = <&buck4_reg>;
> +               operating-points = <

The binding doc says operating-points-v2.

> +                       /* KHz  uV   */
> +                       600000  1150000
> +                       177000  812500
> +               >;
> +       };
> +
>         thermal-zones {
>                 cpu0_thermal: cpu0-thermal {
>                         thermal-sensors = <&tmu_cpu0 0>;
> --
> 2.22.0
>

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[PATCH v2 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Joseph Kogut]

Add device tree node for mali gpu on Odroid XU3 SoCs.

Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
---

Changes v1 -> v2:
- Use interrupt name ordering from binding doc
- Specify a single clock for GPU node
- Add gpu opp table
- Fix warnings from IRQ_TYPE_NONE

 .../boot/dts/exynos5422-odroidxu3-common.dtsi | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
index 93a48f2dda49..b8a4246e3b37 100644
--- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
+++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
@@ -48,6 +48,32 @@
 		cooling-levels = <0 130 170 230>;
 	};

+	gpu: gpu@11800000 {
+		compatible = "samsung,exynos-mali", "arm,mali-t628";
+		reg = <0x11800000 0x5000>;
+		interrupts = <GIC_SPI 219 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 74  IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "job", "mmu", "gpu";
+		clocks = <&clock CLK_G3D>;
+		mali-supply = <&buck4_reg>;
+		operating-points-v2 = <&gpu_opp_table>;
+	};
+
+	gpu_opp_table: gpu-opp-table {
+		compatible = "operating-points-v2";
+
+		opp-177000000 {
+			opp-hz = /bits/ 64 <117000000>;
+			opp-microvolt = <812500>;
+		};
+
+		opp-600000000 {
+			opp-hz = /bits/ 64 <600000000>;
+			opp-microvolt = <1150000>;
+		};
+	};
+
 	thermal-zones {
 		cpu0_thermal: cpu0-thermal {
 			thermal-sensors = <&tmu_cpu0 0>;
--
2.22.0


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Re: [PATCH 1/2] dt-bindings: gpu: add Exynos Mali vendor specifics

[Krzysztof Kozlowski]

On Fri, Jun 14, 2019 at 01:31:43PM -0700, Joseph Kogut wrote:
> Document vendor specific compatible string for Mali gpus on Exynos SoCs.
> 
> Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> ---
>  Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
> index 1b1a74129141..a9704c736d07 100644
> --- a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
> +++ b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
> @@ -18,6 +18,7 @@ Required properties:
>      + "amlogic,meson-gxm-mali"
>      + "rockchip,rk3288-mali"
>      + "rockchip,rk3399-mali"
> +    + "samsung,exynos-mali"

Are there any driver differences for Exynos? If not then why adding
another compatible?

Best regards,
Krzysztof

>  
>  - reg : Physical base address of the device and length of the register area.
>  
> -- 
> 2.22.0
> 

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Re: [PATCH v2 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Krzysztof Kozlowski]

On Fri, Jun 14, 2019 at 04:57:19PM -0700, Joseph Kogut wrote:
> Add device tree node for mali gpu on Odroid XU3 SoCs.
> 
> Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> ---
> 
> Changes v1 -> v2:
> - Use interrupt name ordering from binding doc
> - Specify a single clock for GPU node
> - Add gpu opp table
> - Fix warnings from IRQ_TYPE_NONE
> 
>  .../boot/dts/exynos5422-odroidxu3-common.dtsi | 26 +++++++++++++++++++

This should go to exynos5422-odroid-core.dtsi instead, because it is
common to entire Odroid Exynos5422 family (not only XU3 family).

>  1 file changed, 26 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> index 93a48f2dda49..b8a4246e3b37 100644
> --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> @@ -48,6 +48,32 @@
>  		cooling-levels = <0 130 170 230>;
>  	};
> 
> +	gpu: gpu@11800000 {
> +		compatible = "samsung,exynos-mali", "arm,mali-t628";

This is common to all Exynos542x chips so it should go to
exynos5420.dtsi. Here you would need to only enable it and provide
regulator.

Probably this should be also associated with tmu_gpu as a cooling device
(if Mali registers a cooling device...). Otherwise the tmu_gpu is not
really used for it.

> +		reg = <0x11800000 0x5000>;
> +		interrupts = <GIC_SPI 219 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 74  IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
> +		interrupt-names = "job", "mmu", "gpu";
> +		clocks = <&clock CLK_G3D>;
> +		mali-supply = <&buck4_reg>;

Please check if always-on property could be removed from buck4. Also,
what about LDO27? It should be used as well (maybe through
vendor-specific properties which would justify the need of new vendor
compatible).


Best regards,
Krzysztof

> +		operating-points-v2 = <&gpu_opp_table>;
> +	};
> +
> +	gpu_opp_table: gpu-opp-table {
> +		compatible = "operating-points-v2";
> +
> +		opp-177000000 {
> +			opp-hz = /bits/ 64 <117000000>;
> +			opp-microvolt = <812500>;
> +		};
> +
> +		opp-600000000 {
> +			opp-hz = /bits/ 64 <600000000>;
> +			opp-microvolt = <1150000>;
> +		};
> +	};
> +
>  	thermal-zones {
>  		cpu0_thermal: cpu0-thermal {
>  			thermal-sensors = <&tmu_cpu0 0>;
> --
> 2.22.0
> 

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Re: [PATCH v2 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Joseph Kogut]

Hi Krzysztof,

Thanks for the review.

On Sun, Jun 16, 2019 at 1:59 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> On Fri, Jun 14, 2019 at 04:57:19PM -0700, Joseph Kogut wrote:
> > Add device tree node for mali gpu on Odroid XU3 SoCs.
> >
> > Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> > ---
> >
> > Changes v1 -> v2:
> > - Use interrupt name ordering from binding doc
> > - Specify a single clock for GPU node
> > - Add gpu opp table
> > - Fix warnings from IRQ_TYPE_NONE
> >
> >  .../boot/dts/exynos5422-odroidxu3-common.dtsi | 26 +++++++++++++++++++
>
> This should go to exynos5422-odroid-core.dtsi instead, because it is
> common to entire Odroid Exynos5422 family (not only XU3 family).
>
> >  1 file changed, 26 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > index 93a48f2dda49..b8a4246e3b37 100644
> > --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > @@ -48,6 +48,32 @@
> >               cooling-levels = <0 130 170 230>;
> >       };
> >
> > +     gpu: gpu@11800000 {
> > +             compatible = "samsung,exynos-mali", "arm,mali-t628";
>
> This is common to all Exynos542x chips so it should go to
> exynos5420.dtsi. Here you would need to only enable it and provide
> regulator.
>

To clarify, which pieces are specific to the Odroid Exynos 5422
family, and which are common to the entire Exynos 542x family? I'm
thinking the gpu node is common to the 542x family, including the
interrupts and clock, and the regulator and opp table are specific to
the Odroid 5422?

> Probably this should be also associated with tmu_gpu as a cooling device
> (if Mali registers a cooling device...). Otherwise the tmu_gpu is not
> really used for it.
>

We have two operating performance points for the GPU, but I'm not sure
at what temperature we should trip the lower opp. Looking at the trip
temperatures for the CPU, we have four alerts, and one critical trip.
The highest alert is 85 C, would it be reasonable to trigger the lower
GPU opp at this temperature? Should it trigger sooner?

> > +             reg = <0x11800000 0x5000>;
> > +             interrupts = <GIC_SPI 219 IRQ_TYPE_LEVEL_HIGH>,
> > +                          <GIC_SPI 74  IRQ_TYPE_LEVEL_HIGH>,
> > +                          <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
> > +             interrupt-names = "job", "mmu", "gpu";
> > +             clocks = <&clock CLK_G3D>;
> > +             mali-supply = <&buck4_reg>;
>
> Please check if always-on property could be removed from buck4.

I've checked, and this property can be removed safely.

> Also, what about LDO27? It should be used as well (maybe through
> vendor-specific properties which would justify the need of new vendor
> compatible).
>

I'm unsure how LDO27 is used, can you elaborate?

Best,
Joseph

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Re: [PATCH v2 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Krzysztof Kozlowski]

On Mon, Jun 17, 2019 at 09:15:23AM -0700, Joseph Kogut wrote:
> Hi Krzysztof,
> 
> Thanks for the review.
> 
> On Sun, Jun 16, 2019 at 1:59 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
> >
> > On Fri, Jun 14, 2019 at 04:57:19PM -0700, Joseph Kogut wrote:
> > > Add device tree node for mali gpu on Odroid XU3 SoCs.
> > >
> > > Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> > > ---
> > >
> > > Changes v1 -> v2:
> > > - Use interrupt name ordering from binding doc
> > > - Specify a single clock for GPU node
> > > - Add gpu opp table
> > > - Fix warnings from IRQ_TYPE_NONE
> > >
> > >  .../boot/dts/exynos5422-odroidxu3-common.dtsi | 26 +++++++++++++++++++
> >
> > This should go to exynos5422-odroid-core.dtsi instead, because it is
> > common to entire Odroid Exynos5422 family (not only XU3 family).
> >
> > >  1 file changed, 26 insertions(+)
> > >
> > > diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > > index 93a48f2dda49..b8a4246e3b37 100644
> > > --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > > +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > > @@ -48,6 +48,32 @@
> > >               cooling-levels = <0 130 170 230>;
> > >       };
> > >
> > > +     gpu: gpu@11800000 {
> > > +             compatible = "samsung,exynos-mali", "arm,mali-t628";
> >
> > This is common to all Exynos542x chips so it should go to
> > exynos5420.dtsi. Here you would need to only enable it and provide
> > regulator.
> >
> 
> To clarify, which pieces are specific to the Odroid Exynos 5422
> family, and which are common to the entire Exynos 542x family? I'm
> thinking the gpu node is common to the 542x family, including the
> interrupts and clock, and the regulator and opp table are specific to
> the Odroid 5422?

Opp table depends - it might common to Exynos542x (as all use the same
Mali) or specific to boards (because there is Odroid XU3 Lite with
Exynos5422 working on lower frequencies).

So far the CPU and all bus OPP tables were put in exynos5420.dtsi so I
guess this can go there as well.

For the rest of properties you were correct.

> 
> > Probably this should be also associated with tmu_gpu as a cooling device
> > (if Mali registers a cooling device...). Otherwise the tmu_gpu is not
> > really used for it.
> >
> 
> We have two operating performance points for the GPU, but I'm not sure
> at what temperature we should trip the lower opp. Looking at the trip
> temperatures for the CPU, we have four alerts, and one critical trip.
> The highest alert is 85 C, would it be reasonable to trigger the lower
> GPU opp at this temperature? Should it trigger sooner?

The highest trip point is 120 C and it is critical. In general I would
follow the CPU trip points (so fan should start working at 50 degrees).
Unless you have some other data about recommended trip points. Useful is
vendor kernel (from Samsung, from Hard Kernel).

> 
> > > +             reg = <0x11800000 0x5000>;
> > > +             interrupts = <GIC_SPI 219 IRQ_TYPE_LEVEL_HIGH>,
> > > +                          <GIC_SPI 74  IRQ_TYPE_LEVEL_HIGH>,
> > > +                          <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
> > > +             interrupt-names = "job", "mmu", "gpu";
> > > +             clocks = <&clock CLK_G3D>;
> > > +             mali-supply = <&buck4_reg>;
> >
> > Please check if always-on property could be removed from buck4.
> 
> I've checked, and this property can be removed safely.
> 
> > Also, what about LDO27? It should be used as well (maybe through
> > vendor-specific properties which would justify the need of new vendor
> > compatible).
> >
> 
> I'm unsure how LDO27 is used, can you elaborate?

It is supplying the VDD_G3DS (with a note "SRAM power"). I do not have
any more data on it. However I did not check in vendor kernel for it.

Best regards,
Krzysztof


> 
> Best,
> Joseph

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Re: [PATCH v2 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Rob Herring]

On Fri, Jun 14, 2019 at 5:57 PM Joseph Kogut <joseph.kogut@gmail.com> wrote:
>
> Add device tree node for mali gpu on Odroid XU3 SoCs.
>
> Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> ---
>
> Changes v1 -> v2:
> - Use interrupt name ordering from binding doc
> - Specify a single clock for GPU node
> - Add gpu opp table
> - Fix warnings from IRQ_TYPE_NONE
>
>  .../boot/dts/exynos5422-odroidxu3-common.dtsi | 26 +++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> index 93a48f2dda49..b8a4246e3b37 100644
> --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> @@ -48,6 +48,32 @@
>                 cooling-levels = <0 130 170 230>;
>         };
>
> +       gpu: gpu@11800000 {
> +               compatible = "samsung,exynos-mali", "arm,mali-t628";
> +               reg = <0x11800000 0x5000>;
> +               interrupts = <GIC_SPI 219 IRQ_TYPE_LEVEL_HIGH>,
> +                            <GIC_SPI 74  IRQ_TYPE_LEVEL_HIGH>,
> +                            <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
> +               interrupt-names = "job", "mmu", "gpu";
> +               clocks = <&clock CLK_G3D>;
> +               mali-supply = <&buck4_reg>;
> +               operating-points-v2 = <&gpu_opp_table>;
> +       };
> +
> +       gpu_opp_table: gpu-opp-table {

Not really a new problem in this file, but you are mixing nodes with
and without an address and really the gpu node should be under a
simple-bus node.

If the OPP is only for the GPU, I'd make it a child of the gpu node instead.

> +               compatible = "operating-points-v2";
> +
> +               opp-177000000 {
> +                       opp-hz = /bits/ 64 <117000000>;
> +                       opp-microvolt = <812500>;
> +               };
> +
> +               opp-600000000 {
> +                       opp-hz = /bits/ 64 <600000000>;
> +                       opp-microvolt = <1150000>;
> +               };
> +       };
> +
>         thermal-zones {
>                 cpu0_thermal: cpu0-thermal {
>                         thermal-sensors = <&tmu_cpu0 0>;
> --
> 2.22.0
>

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Re: [PATCH 1/2] dt-bindings: gpu: add Exynos Mali vendor specifics

[Rob Herring]

On Sun, Jun 16, 2019 at 2:16 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> On Fri, Jun 14, 2019 at 01:31:43PM -0700, Joseph Kogut wrote:
> > Document vendor specific compatible string for Mali gpus on Exynos SoCs.
> >
> > Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> > ---
> >  Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
> > index 1b1a74129141..a9704c736d07 100644
> > --- a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
> > +++ b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
> > @@ -18,6 +18,7 @@ Required properties:
> >      + "amlogic,meson-gxm-mali"
> >      + "rockchip,rk3288-mali"
> >      + "rockchip,rk3399-mali"
> > +    + "samsung,exynos-mali"
>
> Are there any driver differences for Exynos? If not then why adding
> another compatible?

Wrong question. Are there any hardware differences? (Trick question
because difference compared to what?)

Really, this shouldn't be 'exynos', but per SoC. But I'll leave it to
the Samsung folks to decide how specific it should be.

Rob

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Re: [PATCH 1/2] dt-bindings: gpu: add Exynos Mali vendor specifics

[Krzysztof Kozlowski]

On Tue, 18 Jun 2019 at 00:06, Rob Herring <robh+dt@kernel.org> wrote:
>
> On Sun, Jun 16, 2019 at 2:16 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
> >
> > On Fri, Jun 14, 2019 at 01:31:43PM -0700, Joseph Kogut wrote:
> > > Document vendor specific compatible string for Mali gpus on Exynos SoCs.
> > >
> > > Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> > > ---
> > >  Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt | 1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
> > > index 1b1a74129141..a9704c736d07 100644
> > > --- a/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
> > > +++ b/Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt
> > > @@ -18,6 +18,7 @@ Required properties:
> > >      + "amlogic,meson-gxm-mali"
> > >      + "rockchip,rk3288-mali"
> > >      + "rockchip,rk3399-mali"
> > > +    + "samsung,exynos-mali"
> >
> > Are there any driver differences for Exynos? If not then why adding
> > another compatible?
>
> Wrong question. Are there any hardware differences? (Trick question
> because difference compared to what?)
>
> Really, this shouldn't be 'exynos', but per SoC. But I'll leave it to
> the Samsung folks to decide how specific it should be.

If vendor compatible is expected, then let's go with per-soc
(Exynos5420) because other SoCs use different Midgard chipsets so they
might come with own differences.

Best regards,
Krzysztof

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Re: [PATCH v2 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Krzysztof Kozlowski]

On Sat, 15 Jun 2019 at 01:57, Joseph Kogut <joseph.kogut@gmail.com> wrote:
>
> Add device tree node for mali gpu on Odroid XU3 SoCs.
>
> Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> ---
>
> Changes v1 -> v2:
> - Use interrupt name ordering from binding doc
> - Specify a single clock for GPU node
> - Add gpu opp table
> - Fix warnings from IRQ_TYPE_NONE
>
>  .../boot/dts/exynos5422-odroidxu3-common.dtsi | 26 +++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> index 93a48f2dda49..b8a4246e3b37 100644
> --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> @@ -48,6 +48,32 @@
>                 cooling-levels = <0 130 170 230>;
>         };
>
> +       gpu: gpu@11800000 {
> +               compatible = "samsung,exynos-mali", "arm,mali-t628";
> +               reg = <0x11800000 0x5000>;
> +               interrupts = <GIC_SPI 219 IRQ_TYPE_LEVEL_HIGH>,
> +                            <GIC_SPI 74  IRQ_TYPE_LEVEL_HIGH>,
> +                            <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
> +               interrupt-names = "job", "mmu", "gpu";
> +               clocks = <&clock CLK_G3D>;
> +               mali-supply = <&buck4_reg>;
> +               operating-points-v2 = <&gpu_opp_table>;
> +       };
> +
> +       gpu_opp_table: gpu-opp-table {

One more thing - use "opp_table" as node name (generic class of node,
matches style with other tables).

Best regards,
Krzysztof

> +               compatible = "operating-points-v2";
> +
> +               opp-177000000 {
> +                       opp-hz = /bits/ 64 <117000000>;
> +                       opp-microvolt = <812500>;
> +               };
> +
> +               opp-600000000 {
> +                       opp-hz = /bits/ 64 <600000000>;
> +                       opp-microvolt = <1150000>;
> +               };
> +       };
> +
>         thermal-zones {
>                 cpu0_thermal: cpu0-thermal {
>                         thermal-sensors = <&tmu_cpu0 0>;
> --
> 2.22.0
>

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Re: [PATCH v2 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Rob Herring]

On Tue, Jun 18, 2019 at 3:27 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> On Sat, 15 Jun 2019 at 01:57, Joseph Kogut <joseph.kogut@gmail.com> wrote:
> >
> > Add device tree node for mali gpu on Odroid XU3 SoCs.
> >
> > Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> > ---
> >
> > Changes v1 -> v2:
> > - Use interrupt name ordering from binding doc
> > - Specify a single clock for GPU node
> > - Add gpu opp table
> > - Fix warnings from IRQ_TYPE_NONE
> >
> >  .../boot/dts/exynos5422-odroidxu3-common.dtsi | 26 +++++++++++++++++++
> >  1 file changed, 26 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > index 93a48f2dda49..b8a4246e3b37 100644
> > --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > @@ -48,6 +48,32 @@
> >                 cooling-levels = <0 130 170 230>;
> >         };
> >
> > +       gpu: gpu@11800000 {
> > +               compatible = "samsung,exynos-mali", "arm,mali-t628";
> > +               reg = <0x11800000 0x5000>;
> > +               interrupts = <GIC_SPI 219 IRQ_TYPE_LEVEL_HIGH>,
> > +                            <GIC_SPI 74  IRQ_TYPE_LEVEL_HIGH>,
> > +                            <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
> > +               interrupt-names = "job", "mmu", "gpu";
> > +               clocks = <&clock CLK_G3D>;
> > +               mali-supply = <&buck4_reg>;
> > +               operating-points-v2 = <&gpu_opp_table>;
> > +       };
> > +
> > +       gpu_opp_table: gpu-opp-table {
>
> One more thing - use "opp_table" as node name (generic class of node,
> matches style with other tables).

'opp-table' as convention is using '-' rather than '_'.

Rob

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Re: [PATCH v2 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Krzysztof Kozlowski]

On Tue, 18 Jun 2019 at 16:18, Rob Herring <robh+dt@kernel.org> wrote:
>
> On Tue, Jun 18, 2019 at 3:27 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
> >
> > On Sat, 15 Jun 2019 at 01:57, Joseph Kogut <joseph.kogut@gmail.com> wrote:
> > >
> > > Add device tree node for mali gpu on Odroid XU3 SoCs.
> > >
> > > Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> > > ---
> > >
> > > Changes v1 -> v2:
> > > - Use interrupt name ordering from binding doc
> > > - Specify a single clock for GPU node
> > > - Add gpu opp table
> > > - Fix warnings from IRQ_TYPE_NONE
> > >
> > >  .../boot/dts/exynos5422-odroidxu3-common.dtsi | 26 +++++++++++++++++++
> > >  1 file changed, 26 insertions(+)
> > >
> > > diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > > index 93a48f2dda49..b8a4246e3b37 100644
> > > --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > > +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > > @@ -48,6 +48,32 @@
> > >                 cooling-levels = <0 130 170 230>;
> > >         };
> > >
> > > +       gpu: gpu@11800000 {
> > > +               compatible = "samsung,exynos-mali", "arm,mali-t628";
> > > +               reg = <0x11800000 0x5000>;
> > > +               interrupts = <GIC_SPI 219 IRQ_TYPE_LEVEL_HIGH>,
> > > +                            <GIC_SPI 74  IRQ_TYPE_LEVEL_HIGH>,
> > > +                            <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
> > > +               interrupt-names = "job", "mmu", "gpu";
> > > +               clocks = <&clock CLK_G3D>;
> > > +               mali-supply = <&buck4_reg>;
> > > +               operating-points-v2 = <&gpu_opp_table>;
> > > +       };
> > > +
> > > +       gpu_opp_table: gpu-opp-table {
> >
> > One more thing - use "opp_table" as node name (generic class of node,
> > matches style with other tables).
>
> 'opp-table' as convention is using '-' rather than '_'.

OK, so rather consistency because most of opp-tables have '_',
including existing DTSes and examples in
Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt and
Documentation/devicetree/bindings/opp/opp.txt.

Best regards,
Krzysztof

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Re: [PATCH v2 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Joseph Kogut]

On Mon, Jun 17, 2019 at 9:36 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> On Mon, Jun 17, 2019 at 09:15:23AM -0700, Joseph Kogut wrote:
> > Hi Krzysztof,
> >
> > Thanks for the review.
> >
> > On Sun, Jun 16, 2019 at 1:59 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
> > >
> > > On Fri, Jun 14, 2019 at 04:57:19PM -0700, Joseph Kogut wrote:
> > > > Add device tree node for mali gpu on Odroid XU3 SoCs.
> > > >
> > > > Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
> > > > ---
> > > >
> > > > Changes v1 -> v2:
> > > > - Use interrupt name ordering from binding doc
> > > > - Specify a single clock for GPU node
> > > > - Add gpu opp table
> > > > - Fix warnings from IRQ_TYPE_NONE
> > > >
> > > >  .../boot/dts/exynos5422-odroidxu3-common.dtsi | 26 +++++++++++++++++++
> > >
> > > This should go to exynos5422-odroid-core.dtsi instead, because it is
> > > common to entire Odroid Exynos5422 family (not only XU3 family).
> > >
> > > >  1 file changed, 26 insertions(+)
> > > >
> > > > diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > > > index 93a48f2dda49..b8a4246e3b37 100644
> > > > --- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > > > +++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
> > > > @@ -48,6 +48,32 @@
> > > >               cooling-levels = <0 130 170 230>;
> > > >       };
> > > >
> > > > +     gpu: gpu@11800000 {
> > > > +             compatible = "samsung,exynos-mali", "arm,mali-t628";
> > >
> > > This is common to all Exynos542x chips so it should go to
> > > exynos5420.dtsi. Here you would need to only enable it and provide
> > > regulator.
> > >
> >
> > To clarify, which pieces are specific to the Odroid Exynos 5422
> > family, and which are common to the entire Exynos 542x family? I'm
> > thinking the gpu node is common to the 542x family, including the
> > interrupts and clock, and the regulator and opp table are specific to
> > the Odroid 5422?
>
> Opp table depends - it might common to Exynos542x (as all use the same
> Mali) or specific to boards (because there is Odroid XU3 Lite with
> Exynos5422 working on lower frequencies).
>
> So far the CPU and all bus OPP tables were put in exynos5420.dtsi so I
> guess this can go there as well.
>
> For the rest of properties you were correct.
>
> >
> > > Probably this should be also associated with tmu_gpu as a cooling device
> > > (if Mali registers a cooling device...). Otherwise the tmu_gpu is not
> > > really used for it.
> > >
> >
> > We have two operating performance points for the GPU, but I'm not sure
> > at what temperature we should trip the lower opp. Looking at the trip
> > temperatures for the CPU, we have four alerts, and one critical trip.
> > The highest alert is 85 C, would it be reasonable to trigger the lower
> > GPU opp at this temperature? Should it trigger sooner?
>
> The highest trip point is 120 C and it is critical. In general I would
> follow the CPU trip points (so fan should start working at 50 degrees).
> Unless you have some other data about recommended trip points. Useful is
> vendor kernel (from Samsung, from Hard Kernel).
>
> >
> > > > +             reg = <0x11800000 0x5000>;
> > > > +             interrupts = <GIC_SPI 219 IRQ_TYPE_LEVEL_HIGH>,
> > > > +                          <GIC_SPI 74  IRQ_TYPE_LEVEL_HIGH>,
> > > > +                          <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
> > > > +             interrupt-names = "job", "mmu", "gpu";
> > > > +             clocks = <&clock CLK_G3D>;
> > > > +             mali-supply = <&buck4_reg>;
> > >
> > > Please check if always-on property could be removed from buck4.
> >
> > I've checked, and this property can be removed safely.
> >
> > > Also, what about LDO27? It should be used as well (maybe through
> > > vendor-specific properties which would justify the need of new vendor
> > > compatible).
> > >
> >
> > I'm unsure how LDO27 is used, can you elaborate?
>
> It is supplying the VDD_G3DS (with a note "SRAM power"). I do not have
> any more data on it. However I did not check in vendor kernel for it.
>

After checking (a fork of) the vendor sources [1], it seems to me that
this regulator is used for memory voltage related to Samsung's
Adaptive Supply Voltage, for which there is a pending patchset [2].

This seems to me to be out of the scope of this patchset, could you confirm?

[1] https://github.com/kumajaya/android_kernel_samsung_universal5422/blob/ad41104d43e6470f8d4880d65b259dc7b903cc0d/arch/arm/mach-exynos/asv-exynos5422.c#L1052
[2] https://lwn.net/Articles/784958/

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Re: [PATCH v2 2/2] arm: dts: add ARM Mali GPU node for Odroid XU3

[Krzysztof Kozlowski]

On Tue, 18 Jun 2019 at 19:42, Joseph Kogut <joseph.kogut@gmail.com> wrote:
> > >
> > > > > +             reg = <0x11800000 0x5000>;
> > > > > +             interrupts = <GIC_SPI 219 IRQ_TYPE_LEVEL_HIGH>,
> > > > > +                          <GIC_SPI 74  IRQ_TYPE_LEVEL_HIGH>,
> > > > > +                          <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
> > > > > +             interrupt-names = "job", "mmu", "gpu";
> > > > > +             clocks = <&clock CLK_G3D>;
> > > > > +             mali-supply = <&buck4_reg>;
> > > >
> > > > Please check if always-on property could be removed from buck4.
> > >
> > > I've checked, and this property can be removed safely.
> > >
> > > > Also, what about LDO27? It should be used as well (maybe through
> > > > vendor-specific properties which would justify the need of new vendor
> > > > compatible).
> > > >
> > >
> > > I'm unsure how LDO27 is used, can you elaborate?
> >
> > It is supplying the VDD_G3DS (with a note "SRAM power"). I do not have
> > any more data on it. However I did not check in vendor kernel for it.
> >
>
> After checking (a fork of) the vendor sources [1], it seems to me that
> this regulator is used for memory voltage related to Samsung's
> Adaptive Supply Voltage, for which there is a pending patchset [2].
>
> This seems to me to be out of the scope of this patchset, could you confirm?
>
> [1] https://github.com/kumajaya/android_kernel_samsung_universal5422/blob/ad41104d43e6470f8d4880d65b259dc7b903cc0d/arch/arm/mach-exynos/asv-exynos5422.c#L1052
> [2] https://lwn.net/Articles/784958/

Hi,

Indeed the vendor sources suggest that voltage scaling of this
regulator depends on ASV, not on frequency. However still the
regulator is there in the hardware so it should be in the bindings as
well (specific to Exynos). I guess the driver should also enable it
but this is separate topic (adding per-platform quirks to Panfrost
driver). Putting it to bindings also follows advice from line 12:
https://elixir.bootlin.com/linux/v5.2-rc5/source/Documentation/devicetree/bindings/writing-bindings.txt#L12

Best regards,
Krzysztof

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