linux-kernel - Re: [PATCH 5/5] arm64: dts: mediatek: mt8390-genio-700-evk: Enable Mali GPU

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Message-ID: <eb17085d-78ff-4833-a4de-17b9327d776c@collabora.com>
Date: Mon, 23 Sep 2024 10:45:51 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Pablo Sun <pablo.sun@...iatek.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 linux-clk@...r.kernel.org
Subject: Re: [PATCH 5/5] arm64: dts: mediatek: mt8390-genio-700-evk: Enable
 Mali GPU

Il 20/09/24 15:41, Pablo Sun ha scritto:
> Configure GPU regulator supplies and enable GPU for GENIO 700 EVK.
> 
> The GPU in MT8390 & MT8188 has two power inputs: "DVDD_GPU" and
> "DVDD_SRAM_GPU". In Genio 700 EVK, DVDD_GPU is supplied by
> mt6359_vproc2_buck_reg, and DVDD_SRAM_GPU is supplied by
> mt6359_vsram_others_ldo_reg.
> 
> According to section 5.2 "Recommended Operating Conditions" in
> MT8390 IoT Application Processor Datasheet v1.9, The recommended
> operating voltage ranges are:
> 
> - DVDD_GPU: min 0.55V, max 0.86V, typical 0.75V
> - DVDD_SRAM_GPU: min 0.71V, max 0.92V, typical 0.85V
> 
> In this commit, we set DVDD_SRAM_GPU to typical 0.85V. It is possbile
> to couple it to the DVDD_GPU in future patches.
> 
> Signed-off-by: Pablo Sun <pablo.sun@...iatek.com>

Is there any real difference between MT8390 and MT8188 in terms of the GPU OPPs?

I see that on MT8188, frequencies up to 880MHz want a DVDD_SRAM_GPU of 0.750V,
then 0.775/0.762/0.750 (bin1-4/5/6) on 915MHz, and 0.800/0.775/0.750 (bin1-4/5/6)
on 950MHz.

Those never call for 0.850V...! So is MT8188 (Chromebooks) wrong, or is MT8390
different in that?

Cheers,
Angelo

> ---
>   .../dts/mediatek/mt8390-genio-700-evk.dts     | 24 +++++++++++++++++++
>   1 file changed, 24 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8390-genio-700-evk.dts b/arch/arm64/boot/dts/mediatek/mt8390-genio-700-evk.dts
> index 1474bef7e754..a1d6f4cd4e5f 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8390-genio-700-evk.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt8390-genio-700-evk.dts
> @@ -190,6 +190,11 @@ usb_p2_vbus: regulator-10 {
>   	};
>   };
>   
> +&gpu {
> +	mali-supply = <&mt6359_vproc2_buck_reg>;
> +	status = "okay";
> +};
> +
>   &i2c0 {
>   	pinctrl-names = "default";
>   	pinctrl-0 = <&i2c0_pins>;
> @@ -253,6 +258,14 @@ &i2c6 {
>   	status = "okay";
>   };
>   
> +&mfg0 {
> +	domain-supply = <&mt6359_vproc2_buck_reg>;
> +};
> +
> +&mfg1 {
> +	domain-supply = <&mt6359_vsram_others_ldo_reg>;
> +};
> +
>   &mmc0 {
>   	status = "okay";
>   	pinctrl-names = "default", "state_uhs";
> @@ -314,6 +327,11 @@ &mt6359_vpa_buck_reg {
>   	regulator-max-microvolt = <3100000>;
>   };
>   
> +&mt6359_vproc2_buck_reg {
> +	regulator-min-microvolt = <550000>;
> +	regulator-max-microvolt = <860000>;
> +};
> +
>   &mt6359_vpu_buck_reg {
>   	regulator-always-on;
>   };
> @@ -326,6 +344,12 @@ &mt6359_vsim1_ldo_reg {
>   	regulator-enable-ramp-delay = <480>;
>   };
>   
> +/* for GPU SRAM */
> +&mt6359_vsram_others_ldo_reg {
> +	regulator-min-microvolt = <850000>;
> +	regulator-max-microvolt = <850000>;
> +};
> +
>   &mt6359_vufs_ldo_reg {
>   	regulator-always-on;
>   };