diff options
Diffstat (limited to 'drivers/crypto/caam/ctrl.c')
| -rw-r--r-- | drivers/crypto/caam/ctrl.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c index 7f7f2960b0cc..b278471f4013 100644 --- a/drivers/crypto/caam/ctrl.c +++ b/drivers/crypto/caam/ctrl.c @@ -341,8 +341,12 @@ static void kick_trng(struct platform_device *pdev, int ent_delay) ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl; r4tst = &ctrl->r4tst[0]; - /* put RNG4 into program mode */ - clrsetbits_32(&r4tst->rtmctl, 0, RTMCTL_PRGM); + /* + * Setting both RTMCTL:PRGM and RTMCTL:TRNG_ACC causes TRNG to + * properly invalidate the entropy in the entropy register and + * force re-generation. + */ + clrsetbits_32(&r4tst->rtmctl, 0, RTMCTL_PRGM | RTMCTL_ACC); /* * Performance-wise, it does not make sense to @@ -372,7 +376,8 @@ start_rng: * select raw sampling in both entropy shifter * and statistical checker; ; put RNG4 into run mode */ - clrsetbits_32(&r4tst->rtmctl, RTMCTL_PRGM, RTMCTL_SAMP_MODE_RAW_ES_SC); + clrsetbits_32(&r4tst->rtmctl, RTMCTL_PRGM | RTMCTL_ACC, + RTMCTL_SAMP_MODE_RAW_ES_SC); } static int caam_get_era_from_hw(struct caam_ctrl __iomem *ctrl) |