From: Matthias Brugger Date: Fri, 18 Dec 2020 10:57:07 +0000 (+0100) Subject: hwrng: iproc-rng200 - Fix disable of the block. X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=96a6af540396ed93ba231d0ae2e6fe196dc22032;p=linux.git hwrng: iproc-rng200 - Fix disable of the block. 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 Acked-by: Scott Branden Acked-by: Florian Fainelli Signed-off-by: Herbert Xu --- diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c index 01583faf9893e..70cd818a0f311 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); }