From patchwork Wed Nov 22 04:16:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vignesh Raghavendra X-Patchwork-Id: 13463924 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 7CB8EC61D92 for ; Wed, 22 Nov 2023 04:17:34 +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: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:In-Reply-To:References: List-Owner; bh=lRZu6LKAU9MZ2ke7ZXk89C7Jxx8qPgZVY4uxPyEt+s4=; b=fhQ1PPmqiCcGBq 6QIWmkfXoDgdfgQzPXotWDMaslBwJ0pZPULD7fQgvgECwBY3vDCxzNfM34JOw3KAisA6iCIhy1IOQ 3wzqSUMK1Cfin7AN9BZIVYmbsO5VcDy3++R9Mhciuxv5sOdGoJ7US73Vo3ZtZ99IrJr+51Li9bXzS rpUPsM0kvIUcnh7/tR2bGVlOkaSt93hu92366XN93lMs1RWwUK1mzklgejqmmRLVuRKu4PaVVAlKT lT/JApyPZJm4hBnh1TIkXVf21kfLn4z5kGOrx3QpwgivhEdFmT7czhrC/FZIgHFWdW2/VtiED30ji 4a45Cbd7L4o48PqJdRmg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1r5efh-000btd-16; Wed, 22 Nov 2023 04:17:05 +0000 Received: from fllv0015.ext.ti.com ([198.47.19.141]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1r5efd-000brE-25 for linux-arm-kernel@lists.infradead.org; Wed, 22 Nov 2023 04:17:04 +0000 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 3AM4GlnI026736; Tue, 21 Nov 2023 22:16:47 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1700626607; bh=2QwHzizvXnwi2gIoXfGTNVgb+YIpsEqc/zkQqkt1laY=; h=From:To:CC:Subject:Date; b=TxTZNu7kqQIOw55qt7E+wi1vsAzzdwMn4qFxSkFZzbj/mMe2vLnBDLsdINc5jF9Gx GwVwsrILBWsmZ/koy8NFmEgIm/bTHePZVxxRhgmYCK8PFiGylV89bENowtUzTgNpkT CTVsFyq245Mdowqar3Uue0hDISGwF7HhpDdheKs0= Received: from DLEE108.ent.ti.com (dlee108.ent.ti.com [157.170.170.38]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 3AM4GljK108302 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 21 Nov 2023 22:16:47 -0600 Received: from DLEE102.ent.ti.com (157.170.170.32) by DLEE108.ent.ti.com (157.170.170.38) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Tue, 21 Nov 2023 22:16:46 -0600 Received: from fllv0039.itg.ti.com (10.64.41.19) by DLEE102.ent.ti.com (157.170.170.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23 via Frontend Transport; Tue, 21 Nov 2023 22:16:46 -0600 Received: from uda0132425.dhcp.ti.com (ileaxei01-snat2.itg.ti.com [10.180.69.6]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 3AM4Gh9G065087; Tue, 21 Nov 2023 22:16:44 -0600 From: Vignesh Raghavendra To: Wim Van Sebroeck , Guenter Roeck CC: Tero Kristo , , , Vignesh Raghavendra , , Subject: [PATCH v2] watchdog: rti_wdt: Drop RPM count when unused Date: Wed, 22 Nov 2023 09:46:42 +0530 Message-ID: <20231122041642.2015936-1-vigneshr@ti.com> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231121_201701_867954_03FA1FAB X-CRM114-Status: GOOD ( 13.16 ) 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 Do a RPM put if watchdog is not already started during probe and re enable it in watchdog start. On K3 SoCs, watchdogs and their corresponding CPUs are under same PD, so if the reference count of unused watchdogs aren't dropped, it will lead to CPU hotplug failures as Device Management firmware won't allow to turn off the PD due to dangling reference count. Fixes: 2d63908bdbfb ("watchdog: Add K3 RTI watchdog support") Signed-off-by: Vignesh Raghavendra Tested-by: Manorit Chawdhry Reviewed-by: Guenter Roeck --- v2: * Drop 1/2 (will be posted along with runtime_pm callbacks) * Use pm_runtime_resume_and_get() instead of pm_runtime_get_sync() which takes care of err handling v1: lore.kernel.org/r/20231110100726.2930218-1-vigneshr@ti.com drivers/watchdog/rti_wdt.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/rti_wdt.c b/drivers/watchdog/rti_wdt.c index 8e1be7ba0103..9215793a1c81 100644 --- a/drivers/watchdog/rti_wdt.c +++ b/drivers/watchdog/rti_wdt.c @@ -77,6 +77,11 @@ static int rti_wdt_start(struct watchdog_device *wdd) { u32 timer_margin; struct rti_wdt_device *wdt = watchdog_get_drvdata(wdd); + int ret; + + ret = pm_runtime_resume_and_get(wdd->parent); + if (ret) + return ret; /* set timeout period */ timer_margin = (u64)wdd->timeout * wdt->freq; @@ -343,6 +348,9 @@ static int rti_wdt_probe(struct platform_device *pdev) if (last_ping) watchdog_set_last_hw_keepalive(wdd, last_ping); + if (!watchdog_hw_running(wdd)) + pm_runtime_put_sync(&pdev->dev); + return 0; err_iomap: @@ -357,7 +365,10 @@ static void rti_wdt_remove(struct platform_device *pdev) struct rti_wdt_device *wdt = platform_get_drvdata(pdev); watchdog_unregister_device(&wdt->wdd); - pm_runtime_put(&pdev->dev); + + if (!pm_runtime_suspended(&pdev->dev)) + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); }