From: Kim Phillips Date: Mon, 17 Sep 2012 23:21:55 +0000 (-0500) Subject: crypto: caam - increase TRNG clocks per sample X-Git-Tag: v3.7-rc1~117^2~8 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a5bbf6fa79abe0cb64aaebc3455f9ba779d6a36f;p=platform%2Fkernel%2Flinux-3.10.git 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 Signed-off-by: Herbert Xu --- diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c index 414ba20..bf20dd8 100644 --- a/drivers/crypto/caam/ctrl.c +++ b/drivers/crypto/caam/ctrl.c @@ -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);