linux-kernel - Re: [PATCH] crypto: caam - limit AXI pipeline to a depth of 1

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Message-ID: <20190328060834.zma7jgxca7xlixyo@gondor.apana.org.au>
Date:   Thu, 28 Mar 2019 14:08:34 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Iuliana Prodan <iuliana.prodan@....com>
Cc:     Horia Geanta <horia.geanta@....com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-imx <linux-imx@....com>
Subject: Re: [PATCH] crypto: caam - limit AXI pipeline to a depth of 1

On Fri, Mar 22, 2019 at 03:39:28PM +0200, Iuliana Prodan wrote:
> Some i.MX6 devices (imx6D, imx6Q, imx6DL, imx6S, imx6DP and imx6DQ) have
> an issue wherein AXI bus transactions may not occur in the correct order.
> This isn't a problem running single descriptors, but can be if running
> multiple concurrent descriptors. Reworking the CAAM driver to throttle
> to single requests is impractical, so this patch limits the AXI pipeline
> to a depth of one (from a default of 4) to preclude this situation from
> occurring.
> This patch applies to known affected platforms.
> 
> Signed-off-by: Radu Solea <radu.solea@....com>
> Signed-off-by: Iuliana Prodan <iuliana.prodan@....com>
> ---
>  drivers/crypto/caam/ctrl.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)

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