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crypto: caam - increase TRNG clocks per sample
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>
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1 changed files with 3 additions and 3 deletions
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@ -129,7 +129,7 @@ static int instantiate_rng(struct device *jrdev)
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/*
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* By default, the TRNG runs for 200 clocks per sample;
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* 800 clocks per sample generates better entropy.
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* 1600 clocks per sample generates better entropy.
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*/
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static void kick_trng(struct platform_device *pdev)
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{
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@ -144,9 +144,9 @@ static void kick_trng(struct platform_device *pdev)
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/* put RNG4 into program mode */
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setbits32(&r4tst->rtmctl, RTMCTL_PRGM);
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/* 800 clocks per sample */
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/* 1600 clocks per sample */
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val = rd_reg32(&r4tst->rtsdctl);
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val = (val & ~RTSDCTL_ENT_DLY_MASK) | (800 << RTSDCTL_ENT_DLY_SHIFT);
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val = (val & ~RTSDCTL_ENT_DLY_MASK) | (1600 << RTSDCTL_ENT_DLY_SHIFT);
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wr_reg32(&r4tst->rtsdctl, val);
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/* min. freq. count */
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wr_reg32(&r4tst->rtfrqmin, 400);
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