From: matthias.bgg@kernel.org
To: mpm@selenic.com, herbert@gondor.apana.org.au, rjui@broadcom.com,
sbranden@broadcom.com, f.fainelli@gmail.com
Cc: linux-kernel@vger.kernel.org, Julia.Lawall@inria.fr,
bcm-kernel-feedback-list@broadcom.com,
linux-arm-kernel@lists.infradead.org, nsaenzjulienne@suse.de,
linux-crypto@vger.kernel.org,
Matthias Brugger <mbrugger@suse.com>
Subject: [PATCH v2 1/2] hwrng: iproc-rng200: Fix disable of the block.
Date: Fri, 18 Dec 2020 11:57:07 +0100 [thread overview]
Message-ID: <20201218105708.28480-1-matthias.bgg@kernel.org> (raw)
From: Matthias Brugger <mbrugger@suse.com>
When trying to disable the block we bitwise or the control
register with value zero. This is confusing as using bitwise or with
value zero doesn't have any effect at all. Drop this as we already set
the enable bit to zero by appling inverted RNG_RBGEN_MASK.
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
Changes in v2:
- fix commit message, dropping Fixes tag
- drop inverted RNT_RBGEN_ENABLE in disable case
drivers/char/hw_random/iproc-rng200.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c
index 01583faf9893..70cd818a0f31 100644
--- a/drivers/char/hw_random/iproc-rng200.c
+++ b/drivers/char/hw_random/iproc-rng200.c
@@ -28,7 +28,6 @@
#define RNG_CTRL_OFFSET 0x00
#define RNG_CTRL_RNG_RBGEN_MASK 0x00001FFF
#define RNG_CTRL_RNG_RBGEN_ENABLE 0x00000001
-#define RNG_CTRL_RNG_RBGEN_DISABLE 0x00000000
#define RNG_SOFT_RESET_OFFSET 0x04
#define RNG_SOFT_RESET 0x00000001
@@ -61,7 +60,6 @@ static void iproc_rng200_restart(void __iomem *rng_base)
/* Disable RBG */
val = ioread32(rng_base + RNG_CTRL_OFFSET);
val &= ~RNG_CTRL_RNG_RBGEN_MASK;
- val |= RNG_CTRL_RNG_RBGEN_DISABLE;
iowrite32(val, rng_base + RNG_CTRL_OFFSET);
/* Clear all interrupt status */
@@ -174,7 +172,6 @@ static void iproc_rng200_cleanup(struct hwrng *rng)
/* Disable RNG hardware */
val = ioread32(priv->base + RNG_CTRL_OFFSET);
val &= ~RNG_CTRL_RNG_RBGEN_MASK;
- val |= RNG_CTRL_RNG_RBGEN_DISABLE;
iowrite32(val, priv->base + RNG_CTRL_OFFSET);
}
--
2.29.2
next reply other threads:[~2020-12-18 10:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-18 10:57 matthias.bgg [this message]
2020-12-18 10:57 ` [PATCH v2 2/2] hwrng: iproc-rng200: Move enable/disable in separate function matthias.bgg
2020-12-18 17:32 ` Scott Branden
2021-01-02 22:08 ` Herbert Xu
2020-12-18 17:30 ` [PATCH v2 1/2] hwrng: iproc-rng200: Fix disable of the block Scott Branden
2020-12-18 17:34 ` Florian Fainelli
2021-01-02 22:08 ` Herbert Xu
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