Re: [PATCH 2/2] arm64: dts: imx8mm: Assign highest opp as suspend opp

[Leonard Crestez]

On 7/4/2019 9:23 AM, Anson.Huang@xxxxxxx wrote:
> From: Anson Huang <Anson.Huang@xxxxxxx>
> 
> Assign highest OPP as suspend OPP to reduce suspend/resume
> latency on i.MX8MM.
> 
> Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
> ---
>   arch/arm64/boot/dts/freescale/imx8mm.dtsi | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> index b11fc5e..3a62407 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> @@ -136,6 +136,7 @@
>   			opp-microvolt = <1000000>;
>   			opp-supported-hw = <0x8>, <0x3>;
>   			clock-latency-ns = <150000>;
> +			opp-suspend;
>   		};
>   	};

What if the highest OPP is unavailable due to speed grading? Ideally we 
should find a way to suspend at the highest *supported* OPP.

Maybe the opp-suspend marking could be assigned from imx-cpufreq-dt 
driver code?

--
Regards,
Leonard