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Mon, 30 May 2022 18:09:53 +0000 From: Vabhav Sharma To: horia.geanta@nxp.com, gaurav.jain@nxp.com, pankaj.gupta@nxp.com, herbert@gondor.apana.org.au, davem@davemloft.net, shawnguo@kernel.org, robh+dt@kernel.org Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, NXP Linux Team , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, silvano.dininno@nxp.com, V.Sethi@nxp.com Subject: [PATCH 1/3] dt-bindings: crypto: fsl: add entropy delay property Date: Mon, 30 May 2022 23:39:22 +0530 Message-Id: <20220530180924.1792399-2-vabhav.sharma@nxp.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220530180924.1792399-1-vabhav.sharma@nxp.com> References: <20220530180924.1792399-1-vabhav.sharma@nxp.com> X-ClientProxiedBy: SI2PR01CA0051.apcprd01.prod.exchangelabs.com (2603:1096:4:193::6) To AS1PR04MB9358.eurprd04.prod.outlook.com (2603:10a6:20b:4dc::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 216f7356-f8fc-43c4-fbc2-08da426797c6 X-MS-TrafficTypeDiagnostic: VI1PR04MB4462:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Signed-off-by: Vabhav Sharma Reviewed-by: Horia Geanta Reviewed-by: Varun Sethi --- Documentation/devicetree/bindings/crypto/fsl-sec4.txt | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/crypto/fsl-sec4.txt b/Documentation/devicetree/bindings/crypto/fsl-sec4.txt index 8f359f473ada..1477294eda38 100644 --- a/Documentation/devicetree/bindings/crypto/fsl-sec4.txt +++ b/Documentation/devicetree/bindings/crypto/fsl-sec4.txt @@ -62,6 +62,12 @@ PROPERTIES Definition: A standard property. Define the 'ERA' of the SEC device. + - entropy-delay + Usage: optional + Value type: + Definition: A property which specifies the length (in system clocks) + of each Entropy sample taken. + - #address-cells Usage: required Value type: From patchwork Mon May 30 18:09:24 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vabhav Sharma X-Patchwork-Id: 577325 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 30E92C433F5 for ; Mon, 30 May 2022 18:10:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242469AbiE3SKM (ORCPT ); Mon, 30 May 2022 14:10:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242457AbiE3SKF (ORCPT ); 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Signed-off-by: Vabhav Sharma Reviewed-by: Gaurav Jain Reviewed-by: Horia Geanta --- drivers/crypto/caam/ctrl.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c index 32253a064d0f..5ffab99d831c 100644 --- a/drivers/crypto/caam/ctrl.c +++ b/drivers/crypto/caam/ctrl.c @@ -619,7 +619,7 @@ static bool needs_entropy_delay_adjustment(void) /* Probe routine for CAAM top (controller) level */ static int caam_probe(struct platform_device *pdev) { - int ret, ring, gen_sk, ent_delay = RTSDCTL_ENT_DLY_MIN; + int ret, ring, gen_sk; u64 caam_id; const struct soc_device_attribute *imx_soc_match; struct device *dev; @@ -627,7 +627,7 @@ static int caam_probe(struct platform_device *pdev) struct caam_ctrl __iomem *ctrl; struct caam_drv_private *ctrlpriv; struct dentry *dfs_root; - u32 scfgr, comp_params; + u32 scfgr, comp_params, ent_delay = RTSDCTL_ENT_DLY_MIN; u8 rng_vid; int pg_size; int BLOCK_OFFSET = 0; @@ -847,6 +847,16 @@ static int caam_probe(struct platform_device *pdev) (rd_reg32(&ctrl->vreg.aesa) & CHA_VER_MISC_AES_NUM_MASK); } + /* + * Read entropy-delay property from device tree. If property is not + * available or missing, update the entropy delay value only for imx6sx. + */ + if (device_property_read_u32(dev, "entropy-delay", &ent_delay)) { + dev_dbg(dev, "entropy-delay property missing in DT\n"); + if (needs_entropy_delay_adjustment()) + ent_delay = 12000; + } + /* * If SEC has RNG version >= 4 and RNG state handle has not been * already instantiated, do RNG instantiation @@ -875,8 +885,6 @@ static int caam_probe(struct platform_device *pdev) * Also, if a handle was instantiated, do not change * the TRNG parameters. */ - if (needs_entropy_delay_adjustment()) - ent_delay = 12000; if (!(ctrlpriv->rng4_sh_init || inst_handles)) { dev_info(dev, "Entropy delay = %u\n",