From patchwork Thu Jun 1 19:39:03 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Antoine Tenart X-Patchwork-Id: 9760987 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A3E10602BC for ; Thu, 1 Jun 2017 19:39:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9DB8028517 for ; Thu, 1 Jun 2017 19:39:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 92CB92851E; Thu, 1 Jun 2017 19:39:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4222728517 for ; Thu, 1 Jun 2017 19:39:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751211AbdFATjt (ORCPT ); Thu, 1 Jun 2017 15:39:49 -0400 Received: from mail.free-electrons.com ([62.4.15.54]:46629 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751205AbdFATjm (ORCPT ); Thu, 1 Jun 2017 15:39:42 -0400 Received: by mail.free-electrons.com (Postfix, from userid 110) id 0015721264; Thu, 1 Jun 2017 21:39:39 +0200 (CEST) Received: from localhost (LFbn-1-3856-160.w86-233.abo.wanadoo.fr [86.233.111.160]) by mail.free-electrons.com (Postfix) with ESMTPSA id C931D21264; Thu, 1 Jun 2017 21:39:39 +0200 (CEST) From: Antoine Tenart To: herbert@gondor.apana.org.au, davem@davemloft.net, maxime.ripard@free-electrons.com, wens@csie.org, clabbe.montjoie@gmail.com Cc: Antoine Tenart , linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 11/13] crypto: sun4i-ss: fix large block size support Date: Thu, 1 Jun 2017 21:39:03 +0200 Message-Id: <20170601193905.28829-12-antoine.tenart@free-electrons.com> X-Mailer: git-send-email 2.9.4 In-Reply-To: <20170601193905.28829-1-antoine.tenart@free-electrons.com> References: <20170601193905.28829-1-antoine.tenart@free-electrons.com> Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The run-time self-tests fail quite early, as soon as the input block size is larger than 64 bytes: alg: hash: Test 4 failed for sha1-sun4i-ss 00000000: b9 c9 1e 52 c0 26 d8 39 81 ff f2 3c 99 b1 27 b2 00000010: 30 d6 c9 85 One thing to notice is the value of the last word, which is the one expected (it can sometime be the last two words). The datasheet isn't very clear about when the digest is ready to retrieve and is seems the bit SS_DATA_END is cleared when the digest was computed *but* that doesn't mean the digest is ready to retrieve in the registers. A ndelay(1) is added before reading the computed digest to ensure it is available in the SS_MD[] registers. Signed-off-by: Antoine Tenart Tested-by: Corentin Labbe Acked-by: Corentin Labbe --- drivers/crypto/sunxi-ss/sun4i-ss-hash.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/crypto/sunxi-ss/sun4i-ss-hash.c b/drivers/crypto/sunxi-ss/sun4i-ss-hash.c index 685de5b6ab17..a4b5ff2b72f8 100644 --- a/drivers/crypto/sunxi-ss/sun4i-ss-hash.c +++ b/drivers/crypto/sunxi-ss/sun4i-ss-hash.c @@ -358,6 +358,15 @@ static int sun4i_hash(struct ahash_request *areq) goto release_ss; } + /* + * The datasheet isn't very clear about when to retrieve the digest. The + * bit SS_DATA_END is cleared when the engine has processed the data and + * when the digest is computed *but* it doesn't mean the digest is + * available in the digest registers. Hence the delay to be sure we can + * read it. + */ + ndelay(1); + for (i = 0; i < crypto_ahash_digestsize(tfm) / 4; i++) op->hash[i] = readl(ss->base + SS_MD0 + i * 4); @@ -446,6 +455,15 @@ static int sun4i_hash(struct ahash_request *areq) goto release_ss; } + /* + * The datasheet isn't very clear about when to retrieve the digest. The + * bit SS_DATA_END is cleared when the engine has processed the data and + * when the digest is computed *but* it doesn't mean the digest is + * available in the digest registers. Hence the delay to be sure we can + * read it. + */ + ndelay(1); + /* Get the hash from the device */ if (op->mode == SS_OP_SHA1) { for (i = 0; i < 5; i++) {