Revert "crypto: caam - adjust RNG timing to support more devices"

This reverts commit ef492d080302913e85122a2d92efa2ca174930f8.

This patch breaks the RNG on i.MX8MM.

Reported-by: Bastian Krause <bst@pengutronix.de>
Link: https://lore.kernel.org/all/e1f3f073-9d5e-1bae-f4f8-08dc48adad62@pengutronix.de/
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index ff9ddbbca3774a698a96c09080d7ed2aa6b4188f..68e73775392d98bc17255d09d4c1b0c725477fa9 100644 (file)
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -382,8 +382,8 @@ static void kick_trng(struct device *dev, int ent_delay)
                val = ent_delay;
                /* min. freq. count, equal to 1/4 of the entropy sample length */
                wr_reg32(&r4tst->rtfrqmin, val >> 2);
-               /* max. freq. count, equal to 16 times the entropy sample length */
-               wr_reg32(&r4tst->rtfrqmax, val << 4);
+               /* disable maximum frequency count */
+               wr_reg32(&r4tst->rtfrqmax, RTFRQMAX_DISABLE);
        }
 
        wr_reg32(&r4tst->rtsdctl, (val << RTSDCTL_ENT_DLY_SHIFT) |