linux-kernel - Re: [PATCH v2 6/7] ARM: defconfig: enable cpufreq driver for RPi

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Date:   Fri, 7 Jun 2019 13:30:00 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Eric Anholt <eric@...olt.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com
Cc:     mbrugger@...e.de, viresh.kumar@...aro.org, rjw@...ysocki.net,
        sboyd@...nel.org, ptesarik@...e.com,
        linux-rpi-kernel@...ts.infradead.org, ssuloev@...altech.com,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        mturquette@...libre.com, linux-pm@...r.kernel.org,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/7] ARM: defconfig: enable cpufreq driver for RPi

Hi Nicolas,

Am 06.06.19 um 16:22 schrieb Nicolas Saenz Julienne:
> This enables on both multi_v7_defconfig and bcm2835_defconfig the new
> firmware based clock and cpufreq drivers for the Raspberry Pi platform.
>
> In the case of bcm2835_defconfig, as the cpufreq subsystem was disabled,
> the subsystem configuration was copied from multi_v7_defconfig (default
> governor, statistics, etc...).
sorry i didn't made any suggestions for this.
>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> ---
>  arch/arm/configs/bcm2835_defconfig  | 9 +++++++++
>  arch/arm/configs/multi_v7_defconfig | 2 ++
>  2 files changed, 11 insertions(+)
>
> diff --git a/arch/arm/configs/bcm2835_defconfig b/arch/arm/configs/bcm2835_defconfig
> index dcf7610cfe55..3fd90bfd5fec 100644
> --- a/arch/arm/configs/bcm2835_defconfig
> +++ b/arch/arm/configs/bcm2835_defconfig
> @@ -37,6 +37,14 @@ CONFIG_CMA=y
>  CONFIG_SECCOMP=y
>  CONFIG_KEXEC=y
>  CONFIG_CRASH_DUMP=y
> +CONFIG_CPU_FREQ=y
> +CONFIG_CPU_FREQ_STAT=y
> +CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
>From my understanding ondemand isn't the best fit for Raspberry Pi. I
would prefer conservative because of the delays through the mailbox
interface but it's not a really strong opinion.
> +CONFIG_CPU_FREQ_GOV_POWERSAVE=m
> +CONFIG_CPU_FREQ_GOV_USERSPACE=m
> +CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m

Please make them builtin in this case.

After that you can have make Acked-by for this patch.

> +CONFIG_CPUFREQ_DT=y
> +CONFIG_ARM_RASPBERRYPI_CPUFREQ=y
>  CONFIG_VFP=y
>  # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
>  # CONFIG_SUSPEND is not set
> @@ -132,6 +140,7 @@ CONFIG_DMA_BCM2835=y
>  CONFIG_STAGING=y
>  CONFIG_SND_BCM2835=m
>  CONFIG_VIDEO_BCM2835=m
> +CONFIG_CLK_RASPBERRYPI=y
>  CONFIG_MAILBOX=y
>  CONFIG_BCM2835_MBOX=y
>  # CONFIG_IOMMU_SUPPORT is not set
> diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig
> index 6b748f214eae..0fd60a83f768 100644
> --- a/arch/arm/configs/multi_v7_defconfig
> +++ b/arch/arm/configs/multi_v7_defconfig
> @@ -102,6 +102,7 @@ CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m
>  CONFIG_CPU_FREQ_GOV_SCHEDUTIL=y
>  CONFIG_CPUFREQ_DT=y
>  CONFIG_ARM_IMX6Q_CPUFREQ=y
> +CONFIG_ARM_RASPBERRYPI_CPUFREQ=y
>  CONFIG_QORIQ_CPUFREQ=y
>  CONFIG_CPU_IDLE=y
>  CONFIG_ARM_CPUIDLE=y
> @@ -899,6 +900,7 @@ CONFIG_STAGING_BOARD=y
>  CONFIG_COMMON_CLK_MAX77686=y
>  CONFIG_COMMON_CLK_RK808=m
>  CONFIG_COMMON_CLK_S2MPS11=m
> +CONFIG_CLK_RASPBERRYPI=y
>  CONFIG_COMMON_CLK_QCOM=y
>  CONFIG_QCOM_CLK_RPM=y
>  CONFIG_APQ_MMCC_8084=y