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crypto: caam - increase TRNG clocks per sample

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we need to configure the TRNG to use more clocks per sample
to handle the two back-to-back 64KiB random descriptor requests
on higher frequency P5040s.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Kim Phillips 2012-09-17 18:21:55 -05:00 committed by Herbert Xu
parent b6f3fefe1f
commit a5bbf6fa79
1 changed files with 3 additions and 3 deletions
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6
drivers/crypto/caam/ctrl.c
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@ -129,7 +129,7 @@ static int instantiate_rng(struct device *jrdev)
/*
* By default, the TRNG runs for 200 clocks per sample;
* 800 clocks per sample generates better entropy.
* 1600 clocks per sample generates better entropy.
*/
static void kick_trng(struct platform_device *pdev)
{
@ -144,9 +144,9 @@ static void kick_trng(struct platform_device *pdev)
/* put RNG4 into program mode */
setbits32(&r4tst->rtmctl, RTMCTL_PRGM);
/* 800 clocks per sample */
/* 1600 clocks per sample */
val = rd_reg32(&r4tst->rtsdctl);
val = (val & ~RTSDCTL_ENT_DLY_MASK) | (800 << RTSDCTL_ENT_DLY_SHIFT);
val = (val & ~RTSDCTL_ENT_DLY_MASK) | (1600 << RTSDCTL_ENT_DLY_SHIFT);
wr_reg32(&r4tst->rtsdctl, val);
/* min. freq. count */
wr_reg32(&r4tst->rtfrqmin, 400);