linux-kernel - [PATCH] crypto: caam - adjust RNG timing to support more devices

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Message-Id: <20230612082615.1255357-1-meenakshi.aggarwal@nxp.com>
Date:   Mon, 12 Jun 2023 10:26:15 +0200
From:   meenakshi.aggarwal@....com
To:     horia.geanta@....com, V.sethi@....com, pankaj.gupta@....com,
        gaurav.jain@....com, herbert@...dor.apana.org.au,
        davem@...emloft.net, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Victoria Milhoan <vicki.milhoan@...escale.com>,
        Dan Douglass <dan.douglass@....com>,
        Vipul Kumar <vipul_kumar@...tor.com>
Subject: [PATCH] crypto: caam - adjust RNG timing to support more devices

From: Victoria Milhoan <vicki.milhoan@...escale.com>

Adjust RNG timing parameters to support more i.MX6 devices.

Signed-off-by: Victoria Milhoan <vicki.milhoan@...escale.com>
Signed-off-by: Dan Douglass <dan.douglass@....com>
Signed-off-by: Vipul Kumar <vipul_kumar@...tor.com>
Signed-off-by: Horia Geantă <horia.geanta@....com>
---
 drivers/crypto/caam/ctrl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 5fed3cf354c0..62dd069942e4 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -383,8 +383,8 @@ static void kick_trng(struct device *dev, int ent_delay)
 	wr_reg32(&r4tst->rtsdctl, val);
 	/* min. freq. count, equal to 1/4 of the entropy sample length */
 	wr_reg32(&r4tst->rtfrqmin, ent_delay >> 2);
-	/* disable maximum frequency count */
-	wr_reg32(&r4tst->rtfrqmax, RTFRQMAX_DISABLE);
+	/* max. freq. count, equal to 16 times the entropy sample length */
+	wr_reg32(&r4tst->rtfrqmax, ent_delay << 4);
 	/* read the control register */
 	val = rd_reg32(&r4tst->rtmctl);
 start_rng:
-- 
2.25.1