From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 988BF3FF4; Tue, 23 Jan 2024 01:50:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705974633; cv=none; b=j/SVcTCb/pGkokhoayC3//Uk+oPr5A+GE4Xdq9nhFOYQJLehDMLiRieEZT9E0W3kAjhNez0Dwblza+PRE8R70MWOAmGn2cWfDnn7bjxFf1qpMcA+Rm4cJRn4eD+cbYsvM0wSAGJuhUzo0SSHh9iMetjVO+pK7BVguQZVza64yAA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705974633; c=relaxed/simple; bh=piyFOrLqAV1dh27cQrWt6VvXmnQYs0MijMxJ2ikQwZA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XLRha/G2QvSaY9YTcAwdWUiI2mr1cyLRRGTGsLS6LsOJ/os2yAFdmMe1KjOZUb64iAWYYksGvttr66MTQUJ/Dh+T/XZhJviQA+RUELPsY+6LOli0gPY1QeTPkyOZj/x2bqhKVfXfH/Tsv4DC6YVoOiQph/j6Z5NYm5jV1yrg46Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=IR+I81/V; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="IR+I81/V" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3BBEEC43394; Tue, 23 Jan 2024 01:50:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1705974633; bh=piyFOrLqAV1dh27cQrWt6VvXmnQYs0MijMxJ2ikQwZA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IR+I81/VhC8RHVft3M8ZCEZuA448T8W2LGBNrfkgvZSWdmIAm63Npth6JSk2sCCPw r0X8ybdxNOFBBDoF4gXWfeSOV4zyBux11Zn/HQamizMdE1cAQ354PgT+umsYg6pxja Kny1392TB7XiMkr8AMzgLdcJYoHAt0N3OrkqdKUo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vignesh Raghavendra , Manorit Chawdhry , Guenter Roeck , Wim Van Sebroeck , Sasha Levin Subject: [PATCH 5.15 222/374] watchdog: rti_wdt: Drop runtime pm reference count when watchdog is unused Date: Mon, 22 Jan 2024 15:57:58 -0800 Message-ID: <20240122235752.389597323@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240122235744.598274724@linuxfoundation.org> References: <20240122235744.598274724@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vignesh Raghavendra [ Upstream commit c1a6edf3b541e44e78f10bc6024df779715723f1 ] Call runtime_pm_put*() if watchdog is not already started during probe and re enable it in watchdog start as required. On K3 SoCs, watchdogs and their corresponding CPUs are under same power-domain, 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 power-domain 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 Link: https://lore.kernel.org/r/20231213140110.938129-1-vigneshr@ti.com Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck Signed-off-by: Sasha Levin --- 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 46c2a4bd9ebe..daa00f3c5a6a 100644 --- a/drivers/watchdog/rti_wdt.c +++ b/drivers/watchdog/rti_wdt.c @@ -70,6 +70,11 @@ 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; @@ -296,6 +301,9 @@ 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: @@ -310,7 +318,10 @@ static int 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); return 0; -- 2.43.0