From patchwork Fri Feb 18 10:17:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudiu Beznea X-Patchwork-Id: 12751258 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B4D4FC433F5 for ; Fri, 18 Feb 2022 10:18:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=AJ2a9ecfponA9PF+ioqWfz4Kg25HqMpVEVJya3THh8U=; b=rcoCXjNusKhFY5 Ftm1famQupp/iHKXLOFBC46nJ5JoyrZv/D5DJZ9mo7iP4jsFT/7TLT/eVWxTdViET8CMBlrWIBFeM BQl/ffRJCWG0pBaW9sCiziVzbsZkWkWRyllw0MfLz8n2NR9HSjjLXsFIPYeZTaX89SZvUw9g4H7W0 J1N5zKagO/d/e5a+/qnX3M5rImvlahnFzoPQU7LlSVLFKh7PYkysesovbXoOYF8NsaDVB2b3igN24 thTRpgb5LbKQoW5TB7pxdNUzsuwrtMnfG2q4Q4z6B9FBg6W64QaKVNIRzeXv2cTEBj6zhqgTrACZC 48Ux+HDWNXNA0TJpfLNw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nL0KC-00DnPV-Be; Fri, 18 Feb 2022 10:17:16 +0000 Received: from esa.microchip.iphmx.com ([68.232.154.123]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nL0JG-00Dmzr-DM for linux-arm-kernel@lists.infradead.org; Fri, 18 Feb 2022 10:16:20 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1645179378; x=1676715378; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=iRwy/l1gN6TA2D/EeDe1EPLIvg3mQHpedoZHLk08KpA=; b=vbnZoZ+SWPT7adiVNOD3ibFiOrvTNFzZ86odZZWfANxCdQUuAhF8G86u y/gxiJYufc4iKi8+i1yYmBihM37/Ka+rrtzVrOyzHCWaPU6l0CbOdoQka Sye6VPrM2SlpFOuAxBHpX//6W5bc1ebwjTJGUcmBGTYwR7yHfnwyyF7xa zEXYpuAQaA9EBpnPnUMNOgsSr9M5MVxFsBLX1BiTQaBcH+eRtztBvQt5w 7M/beupaSYUC3PUTjwJnKhVCUY6YcLDyp6tzVznfZAt9460w0h7jqL6P4 DF2RCu5ACiAm/KZt6fKlPFGVO7cRYfGkDcRx9/NkRPEPc01qFz0wkUQBB g==; X-IronPort-AV: E=Sophos;i="5.88,378,1635231600"; d="scan'208";a="149200684" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa2.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 18 Feb 2022 03:16:17 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.17; Fri, 18 Feb 2022 03:16:17 -0700 Received: from localhost.localdomain (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2375.17 via Frontend Transport; Fri, 18 Feb 2022 03:16:15 -0700 From: Claudiu Beznea To: , , , , CC: , , Claudiu Beznea Subject: [PATCH 4/7] hwrng: atmel - move set of TRNG_HALFR in atmel_trng_init() Date: Fri, 18 Feb 2022 12:17:09 +0200 Message-ID: <20220218101712.530576-5-claudiu.beznea@microchip.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20220218101712.530576-1-claudiu.beznea@microchip.com> References: <20220218101712.530576-1-claudiu.beznea@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220218_021618_555382_ED477E4F X-CRM114-Status: GOOD ( 16.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Move set of TRNG_HALFR in atmel_trng_init() as this function is also called on resume path. In case of SAMA7G5 (where backup and self-refresh PM mode is available) most of the SoC parts are powered of (including TRNG) when entering suspend. In that case on resuming path TRNG_HALFR should also be re-configured. Signed-off-by: Claudiu Beznea --- drivers/char/hw_random/atmel-rng.c | 49 +++++++++++++++--------------- 1 file changed, 25 insertions(+), 24 deletions(-) diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c index 17f02049c112..ef49dbe681cf 100644 --- a/drivers/char/hw_random/atmel-rng.c +++ b/drivers/char/hw_random/atmel-rng.c @@ -36,6 +36,7 @@ struct atmel_trng { struct clk *clk; void __iomem *base; struct hwrng rng; + bool has_half_rate; }; static bool atmel_trng_wait_ready(struct atmel_trng *trng, bool wait) @@ -74,14 +75,32 @@ static int atmel_trng_read(struct hwrng *rng, void *buf, size_t max, return ret; } -static void atmel_trng_init(struct atmel_trng *trng) +static int atmel_trng_init(struct atmel_trng *trng) { + unsigned long rate; + int ret; + + ret = clk_prepare_enable(trng->clk); + if (ret) + return ret; + + if (trng->has_half_rate) { + rate = clk_get_rate(trng->clk); + + /* if peripheral clk is above 100MHz, set HALFR */ + if (rate > 100000000) + writel(TRNG_HALFR, trng->base + TRNG_MR); + } + writel(TRNG_KEY | 1, trng->base + TRNG_CR); + + return 0; } static void atmel_trng_cleanup(struct atmel_trng *trng) { writel(TRNG_KEY, trng->base + TRNG_CR); + clk_disable_unprepare(trng->clk); } static int atmel_trng_probe(struct platform_device *pdev) @@ -105,22 +124,14 @@ static int atmel_trng_probe(struct platform_device *pdev) if (!data) return -ENODEV; - if (data->has_half_rate) { - unsigned long rate = clk_get_rate(trng->clk); - - /* if peripheral clk is above 100MHz, set HALFR */ - if (rate > 100000000) - writel(TRNG_HALFR, trng->base + TRNG_MR); - } + trng->has_half_rate = data->has_half_rate; + trng->rng.name = pdev->name; + trng->rng.read = atmel_trng_read; - ret = clk_prepare_enable(trng->clk); + ret = atmel_trng_init(trng); if (ret) return ret; - atmel_trng_init(trng); - trng->rng.name = pdev->name; - trng->rng.read = atmel_trng_read; - ret = devm_hwrng_register(&pdev->dev, &trng->rng); if (ret) goto err_register; @@ -130,7 +141,6 @@ static int atmel_trng_probe(struct platform_device *pdev) return 0; err_register: - clk_disable_unprepare(trng->clk); atmel_trng_cleanup(trng); return ret; } @@ -141,7 +151,6 @@ static int atmel_trng_remove(struct platform_device *pdev) atmel_trng_cleanup(trng); - clk_disable_unprepare(trng->clk); return 0; } @@ -152,7 +161,6 @@ static int atmel_trng_suspend(struct device *dev) struct atmel_trng *trng = dev_get_drvdata(dev); atmel_trng_cleanup(trng); - clk_disable_unprepare(trng->clk); return 0; } @@ -160,15 +168,8 @@ static int atmel_trng_suspend(struct device *dev) static int atmel_trng_resume(struct device *dev) { struct atmel_trng *trng = dev_get_drvdata(dev); - int ret; - ret = clk_prepare_enable(trng->clk); - if (ret) - return ret; - - atmel_trng_init(trng); - - return 0; + return atmel_trng_init(trng); } static const struct dev_pm_ops atmel_trng_pm_ops = {