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SubjectRe: [PATCH] crypto: caam - set RDB bit in security configuration register
On Wed, 6 Feb 2013 17:17:46 +0530
Vakul Garg <> wrote:

> This change is required for post SEC-5.0 devices which have RNG4. Setting RDB

wrap your commit message text to 75 chars

> in security configuration register allows CAAM to use the "Random Data Buffer"
> to be filled by a single request. The Random Data Buffer is large enough for
> ten packets to get their IVs from a single request. If the Random Data Buffer
> is not enabled, then each IV causes a separate request, and RNG4 hardware
> cannot keep up resulting in lower IPSEC throughput.

Linux kernel IPSec or another IPSEC stack? how much lower?

> + if (of_device_is_compatible(nprop, "fsl,sec-v5.0"))
> + setbits32(&topregs->ctrl.scfgr, SCFGR_RDBENABLE);
> +

this belongs further down - at the end of the RNG4 initialization


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