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
WARNING: multiple messages have this Message-ID (diff)
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: Matthias Brugger <mbrugger@suse.com>, 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 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2020-12-18 10:58 UTC|newest] Thread overview: 14+ 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 1/2] hwrng: iproc-rng200: Fix disable of the block matthias.bgg 2020-12-18 10:57 ` [PATCH v2 2/2] hwrng: iproc-rng200: Move enable/disable in separate function matthias.bgg 2020-12-18 10:57 ` matthias.bgg 2020-12-18 17:32 ` Scott Branden 2020-12-18 17:32 ` Scott Branden 2021-01-02 22:08 ` Herbert Xu 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 17:30 ` Scott Branden 2020-12-18 17:34 ` Florian Fainelli 2020-12-18 17:34 ` Florian Fainelli 2021-01-02 22:08 ` Herbert Xu 2021-01-02 22:08 ` Herbert Xu
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