linux-kernel - Re: [PATCH 1/2] arm64: dts: ti: am62-phycore-som: Increase cpu frequency to 1.4 GHz

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240913180949.dlw3k6epqmzlpuu5@studied>
Date: Fri, 13 Sep 2024 13:09:49 -0500
From: Nishanth Menon <nm@...com>
To: Garrett Giordano <ggiordano@...tec.com>
CC: <vigneshr@...com>, <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <w.egorov@...tec.de>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <upstream@...ts.phytec.de>
Subject: Re: [PATCH 1/2] arm64: dts: ti: am62-phycore-som: Increase cpu
 frequency to 1.4 GHz

On 10:56-20240913, Garrett Giordano wrote:
> The am625 is capable of running at 1.4 GHz when VDD_CORE is increased
> from 0.75V to 0.85V. Here we add a 1.4 GHz node to the a53_opp_table and
> increase the VDD_CORE voltage accordingly.

The entire argument in introducing the 1.4Ghz overlay seems to have been
to let users have the choice. What has changed since then?

Ref: commit 7a5775a3da906dab059b8de60a2b88f6016cb4b8

btw, instead of putting a patch to delete the dtso, you should
probably consider a revert patch instead.

> 
> Signed-off-by: Garrett Giordano <ggiordano@...tec.com>
> ---
>  arch/arm64/boot/dts/ti/k3-am62-phycore-som.dtsi | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-phycore-som.dtsi b/arch/arm64/boot/dts/ti/k3-am62-phycore-som.dtsi
> index ac8959f3d953..8acbd4facf37 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-phycore-som.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62-phycore-som.dtsi
> @@ -205,6 +205,13 @@ AM62X_IOPAD(0x01f4, PIN_INPUT, 0) /* (D16) EXTINTn */
>  	};
>  };
>  
> +&a53_opp_table {
> +	opp-1400000000 {
> +		opp-hz = /bits/ 64 <1400000000>;
> +		opp-supported-hw = <0x01 0x0004>;
> +	};
> +};
> +
>  &mcu_m4fss {
>  	mboxes = <&mailbox0_cluster0 &mbox_m4_0>;
>  	memory-region = <&mcu_m4fss_dma_memory_region>,
> @@ -265,8 +272,8 @@ pmic@30 {
>  		regulators {
>  			vdd_core: buck1 {
>  				regulator-name = "VDD_CORE";
> -				regulator-min-microvolt = <750000>;
> -				regulator-max-microvolt = <750000>;
> +				regulator-min-microvolt = <850000>;
> +				regulator-max-microvolt = <850000>;
>  				regulator-boot-on;
>  				regulator-always-on;
>  			};
> -- 
> 2.25.1
> 


-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D