linux-kernel - Re: [PATCH] crypto: octeontx2: CN10K CPT to RNM workaround

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Date:   Sat, 5 Feb 2022 15:30:29 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Shijith Thotton <sthotton@...vell.com>
Cc:     Arnaud Ebalard <arno@...isbad.org>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Srujana Challa <schalla@...vell.com>,
        linux-crypto@...r.kernel.org, jerinj@...vell.com,
        sgoutham@...vell.com, "David S. Miller" <davem@...emloft.net>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] crypto: octeontx2: CN10K CPT to RNM workaround

On Tue, Jan 25, 2022 at 11:56:22PM +0530, Shijith Thotton wrote:
> From: Srujana Challa <schalla@...vell.com>
> 
> When software sets CPT_AF_CTL[RNM_REQ_EN]=1 and RNM in not producing
> entropy(i.e., RNM_ENTROPY_STATUS[NORMAL_CNT] < 0x40), the first cycle of
> the response may be lost due to a conditional clocking issue. Due to
> this, the subsequent random number stream will be corrupted. So, this
> patch adds support to ensure RNM_ENTROPY_STATUS[NORMAL_CNT] = 0x40
> before writing CPT_AF_CTL[RNM_REQ_EN] = 1, as a workaround.
> 
> Signed-off-by: Srujana Challa <schalla@...vell.com>
> Signed-off-by: Shijith Thotton <sthotton@...vell.com>
> ---
>  .../marvell/octeontx2/otx2_cptpf_ucode.c      | 43 ++++++++++++++++++-
>  1 file changed, 42 insertions(+), 1 deletion(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt