linux-kernel - Re: [PATCH] cpufreq: ARM_BRCMSTB_AVS_CPUFREQ cannot be used with ARM_SCMI

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Message-ID: <20231011052257.ly5g5zm5quqpcgfb@vireshk-i7>
Date:   Wed, 11 Oct 2023 10:52:57 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Florian Fainelli <florian.fainelli@...adcom.com>
Cc:     linux-kernel@...r.kernel.org, mmayer@...adcom.com,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "open list:CPU FREQUENCY SCALING FRAMEWORK" 
        <linux-pm@...r.kernel.org>
Subject: Re: [PATCH] cpufreq: ARM_BRCMSTB_AVS_CPUFREQ cannot be used with
 ARM_SCMI_CPUFREQ

On 10-10-23, 11:16, Florian Fainelli wrote:
> The brcmstb-avs-cpufreq driver is considered a legacy driver and since
> 2018, ARCH_BRCMSTB systems have been using scmi-cpufreq. As a matter of
> fact, when SCMI is in use, brcmstb-avs-cpufreq is unusable since the
> SCMI firmware takes over, this can result in various problems, including
> external synchronous aborts.
> 
> Express those constraints such that the driver is not enabled by default
> when SCMI CPU frequency scaling is in use.
> 
> Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>
> ---
>  drivers/cpufreq/Kconfig.arm | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
> index 123b4bbfcfee..c287305820b7 100644
> --- a/drivers/cpufreq/Kconfig.arm
> +++ b/drivers/cpufreq/Kconfig.arm
> @@ -90,7 +90,7 @@ config ARM_VEXPRESS_SPC_CPUFREQ
>  
>  config ARM_BRCMSTB_AVS_CPUFREQ
>  	tristate "Broadcom STB AVS CPUfreq driver"
> -	depends on ARCH_BRCMSTB || COMPILE_TEST
> +	depends on ARCH_BRCMSTB && !(ARM_SCMI_PROTOCOL && ARM_SCMI_CPUFREQ) || COMPILE_TEST

ARM_SCMI_CPUFREQ already implies ARM_SCMI_PROTOCOL, you don't need to
add both here.

-- 
viresh