linux-kernel - Re: [PATCH v2 5/7] firmware: arm_scmi: Make use of FastChannels configurable

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Date:   Mon, 6 Jun 2022 08:04:14 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Cristian Marussi <cristian.marussi@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     sudeep.holla@....com, james.quinlan@...adcom.com,
        Jonathan.Cameron@...wei.com, f.fainelli@...il.com,
        etienne.carriere@...aro.org, vincent.guittot@...aro.org,
        daniel.lezcano@...aro.org, tarek.el-sherbiny@....com,
        adrian.slatineanu@....com, souvik.chakravarty@....com,
        wleavitt@...vell.com, wbartczak@...vell.com
Subject: Re: [PATCH v2 5/7] firmware: arm_scmi: Make use of FastChannels
 configurable

Hi,

On 6/6/22 03:02, Cristian Marussi wrote:
> diff --git a/drivers/firmware/arm_scmi/Kconfig b/drivers/firmware/arm_scmi/Kconfig
> index 1e7b7fec97d9..624f32b61825 100644
> --- a/drivers/firmware/arm_scmi/Kconfig
> +++ b/drivers/firmware/arm_scmi/Kconfig
> @@ -42,6 +42,19 @@ config ARM_SCMI_HAVE_MSG
>  	  This declares whether a message passing based transport for SCMI is
>  	  available.
>  
> +config ARM_SCMI_USE_FASTCHANNELS
> +	bool "Use SCMI FastChannels when available"
> +	default y
> +	help
> +	  Use SCMI FastChannels when advertised as available by the platform.
> +
> +	  On systems where the SCMI platform advertises the availability of
> +	  FastChannels, supported SCMI commands can be issued triggering a
> +	  one-way FastChannel request, much more quicker than using a

Either                                 much more quickly
or                                     much quicker

> +	  regular SCMI message transfer.
> +	  When set to N forces the OSPM to use instead regular SCMI message
> +	  transfers even if FastChannels are available. If unsure say Y.

thanks.
-- 
~Randy