From patchwork Fri Dec 18 10:57:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Brugger X-Patchwork-Id: 11981805 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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=unavailable 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 D453AC2D0E4 for ; Fri, 18 Dec 2020 10:58:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 95C5823A62 for ; Fri, 18 Dec 2020 10:58:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728249AbgLRK54 (ORCPT ); Fri, 18 Dec 2020 05:57:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:41276 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725897AbgLRK54 (ORCPT ); Fri, 18 Dec 2020 05:57:56 -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 v2 1/2] hwrng: iproc-rng200: Fix disable of the block. Date: Fri, 18 Dec 2020 11:57:07 +0100 Message-Id: <20201218105708.28480-1-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 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 --- 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); }