linux-kernel - Re: [PATCH 4/4] arm64: cpu_errata: Apply Erratum 845719 to KRYO2XX Silver

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Date:   Thu, 05 Nov 2020 09:29:37 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Rob Herring <robh@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Steven Price <steven.price@....com>,
        Mark Brown <broonie@...nel.org>,
        Andrew Scull <ascull@...gle.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Amit Daniel Kachhap <amit.kachhap@....com>,
        Ionela Voinescu <ionela.voinescu@....com>,
        Kristina Martsenko <kristina.martsenko@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] arm64: cpu_errata: Apply Erratum 845719 to KRYO2XX
 Silver

On 2020-11-04 23:22, Konrad Dybcio wrote:
> QCOM KRYO2XX Silver cores are Cortex-A53 based and are
> susceptible to the 845719 erratum. Add them to the lookup
> list to apply the erratum.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> ---
>  arch/arm64/kernel/cpu_errata.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/kernel/cpu_errata.c 
> b/arch/arm64/kernel/cpu_errata.c
> index 61314fd70f13..cafaf0da05b7 100644
> --- a/arch/arm64/kernel/cpu_errata.c
> +++ b/arch/arm64/kernel/cpu_errata.c
> @@ -299,6 +299,8 @@ static const struct midr_range 
> erratum_845719_list[] = {
>  	MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4),
>  	/* Brahma-B53 r0p[0] */
>  	MIDR_REV(MIDR_BRAHMA_B53, 0, 0),
> +	/* Kryo2XX Silver rAp4 */
> +	MIDR_REV(MIDR_QCOM_KRYO_2XX_SILVER, 0xa, 0x4),

Is this the only affected version? If this is actually an A53, how do 
the
revisions map between Kryo and Cortex cores?

         M.
-- 
Jazz is not dead. It just smells funny...