From patchwork Mon Dec 14 16:04:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Brugger X-Patchwork-Id: 343619 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7BB6FC2BB48 for ; Mon, 14 Dec 2020 16:07:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4DAB322583 for ; Mon, 14 Dec 2020 16:07:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730647AbgLNQGW (ORCPT ); Mon, 14 Dec 2020 11:06:22 -0500 Received: from mail.kernel.org ([198.145.29.99]:44452 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2440057AbgLNQFn (ORCPT ); Mon, 14 Dec 2020 11:05:43 -0500 From: matthias.bgg@kernel.org Authentication-Results: mail.kernel.org; dkim=permerror (bad message/signature format) 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 Subject: [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block. Date: Mon, 14 Dec 2020 17:04:53 +0100 Message-Id: <20201214160454.22769-1-matthias.bgg@kernel.org> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Matthias Brugger When trying to disable the block we bitwise or the control register with value zero. This will leave the block always turned on. Fix this by setting the corresponding bit to zero. Fixes: c83d45d5685f ("hwrng: iproc-rng200 - Add Broadcom IPROC RNG driver") Signed-off-by: Matthias Brugger --- drivers/char/hw_random/iproc-rng200.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c index 01583faf9893..e106ce3c0146 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 +60,7 @@ 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; + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; iowrite32(val, rng_base + RNG_CTRL_OFFSET); /* Clear all interrupt status */ @@ -174,7 +173,7 @@ 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; + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; iowrite32(val, priv->base + RNG_CTRL_OFFSET); }