From patchwork Fri Feb 18 10:17:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudiu Beznea X-Patchwork-Id: 12751271 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 67D7DC433EF for ; Fri, 18 Feb 2022 10:19:11 +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=a+/9WFfLKvPTBL8Bt82N70/U3U/TV0BRz8GITWnPouk=; b=gT/Ws0ZGHWhalS SNHC8ajeX17CXoBs2wIWG3IVNmb6uKFCXnusgHx5OCJDPAgc/0eMZzKmx8YpAzv0Bc4NWlqT7mkdE ixytLsLJvT9e/XwbvwMECfBxg7RBnAw0iZMnmKvaY2uj2mFKb2OO4GP2zI6iLZHvFVJc7H03o6Zh8 Bn5x/ul7Zg2tpXvyFobyYYLbLqpkm+ldUvza/QkRpO2FF6zATUCKnmtzt2HtnwSGiYswAzG3VfyRY KGi21q+lbtH1ZJsg3xr5ZiShVO84rk3CpX4GgWdWzXF0jFd0/LPoPhu6K2sjH6evvopsFRvdUPw0p 6j3vaFRi/0bDXOSoRQaw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nL0Kh-00Dnfc-Ua; Fri, 18 Feb 2022 10:17:48 +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 1nL0JL-00Dn1U-4r for linux-arm-kernel@lists.infradead.org; Fri, 18 Feb 2022 10:16:24 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1645179384; x=1676715384; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=hXm0Jtwri1nLMNu8938lMqvk/Ro4GDt9J9rutPzfAFk=; b=FVDbL+Q0BBjQ0mPLjUM+ObYMk0/GSi1lREDuhr6Wud3T/6EILPTcfgIY wBaxVJJjk+QDDqdYzLJd+F/uo4ExNZYYHFFZTBHmUWBG1vqOlauarPxHG L6nJKepl2eW4Es549/zOrHl1gdfX0hcLzwhRG4PBho6o3aAs4qdcgCVSY +nD64gr6n6exGK1Jt5EiXSZ4tPZMFZ4lqpLo6KiawxVw9D+3IlULfIv5j Ql74C1AHkjKqfusVyFyWTobElXpGg20azWec+dLrlpkLeukSPH9XQv6Z8 ap+4VN75suk/1gH1WkpQpvNMiFjrjCFSUKe1dYgwME6ogktOCGZIAv8xd w==; X-IronPort-AV: E=Sophos;i="5.88,378,1635231600"; d="scan'208";a="146491146" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa4.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 18 Feb 2022 03:16:23 -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 03:16:22 -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 03:16:20 -0700 From: Claudiu Beznea To: , , , , CC: , , Claudiu Beznea Subject: [PATCH 6/7] hwrnd: atmel - add runtime pm support Date: Fri, 18 Feb 2022 12:17:11 +0200 Message-ID: <20220218101712.530576-7-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_021623_296933_0A5E5240 X-CRM114-Status: GOOD ( 13.19 ) 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 Add runtime PM support. Signed-off-by: Claudiu Beznea --- drivers/char/hw_random/atmel-rng.c | 44 ++++++++++++++++++++++-------- 1 file changed, 32 insertions(+), 12 deletions(-) diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c index 0fff74808472..b662d44a09a6 100644 --- a/drivers/char/hw_random/atmel-rng.c +++ b/drivers/char/hw_random/atmel-rng.c @@ -17,6 +17,7 @@ #include #include #include +#include #define TRNG_CR 0x00 #define TRNG_MR 0x04 @@ -58,6 +59,12 @@ static int atmel_trng_read(struct hwrng *rng, void *buf, size_t max, u32 *data = buf; int ret; + ret = pm_runtime_get_sync((struct device *)trng->rng.priv); + if (ret < 0) { + pm_runtime_put_sync((struct device *)trng->rng.priv); + return ret; + } + ret = atmel_trng_wait_ready(trng, wait); if (!ret) goto out; @@ -72,6 +79,8 @@ static int atmel_trng_read(struct hwrng *rng, void *buf, size_t max, ret = 4; out: + pm_runtime_mark_last_busy((struct device *)trng->rng.priv); + pm_runtime_put_sync_autosuspend((struct device *)trng->rng.priv); return ret; } @@ -127,21 +136,28 @@ static int atmel_trng_probe(struct platform_device *pdev) trng->has_half_rate = data->has_half_rate; trng->rng.name = pdev->name; trng->rng.read = atmel_trng_read; + trng->rng.priv = (unsigned long)&pdev->dev; + platform_set_drvdata(pdev, trng); +#ifndef CONFIG_PM ret = atmel_trng_init(trng); if (ret) return ret; +#endif - ret = devm_hwrng_register(&pdev->dev, &trng->rng); - if (ret) - goto err_register; - - platform_set_drvdata(pdev, trng); + pm_runtime_set_autosuspend_delay(&pdev->dev, 100); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_enable(&pdev->dev); - return 0; + ret = devm_hwrng_register(&pdev->dev, &trng->rng); + if (ret) { + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); +#ifndef CONFIG_PM + atmel_trng_cleanup(trng); +#endif + } -err_register: - atmel_trng_cleanup(trng); return ret; } @@ -151,11 +167,13 @@ static int atmel_trng_remove(struct platform_device *pdev) atmel_trng_cleanup(trng); + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); return 0; } -static int __maybe_unused atmel_trng_suspend(struct device *dev) +static int __maybe_unused atmel_trng_runtime_suspend(struct device *dev) { struct atmel_trng *trng = dev_get_drvdata(dev); @@ -164,7 +182,7 @@ static int __maybe_unused atmel_trng_suspend(struct device *dev) return 0; } -static int __maybe_unused atmel_trng_resume(struct device *dev) +static int __maybe_unused atmel_trng_runtime_resume(struct device *dev) { struct atmel_trng *trng = dev_get_drvdata(dev); @@ -172,8 +190,10 @@ static int __maybe_unused atmel_trng_resume(struct device *dev) } static const struct dev_pm_ops __maybe_unused atmel_trng_pm_ops = { - .suspend = atmel_trng_suspend, - .resume = atmel_trng_resume, + SET_RUNTIME_PM_OPS(atmel_trng_runtime_suspend, + atmel_trng_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) }; static const struct atmel_trng_data at91sam9g45_config = {