From patchwork Thu Jul 30 23:03:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anson Huang X-Patchwork-Id: 11693835 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F1936913 for ; Thu, 30 Jul 2020 23:08:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D9C2320809 for ; Thu, 30 Jul 2020 23:08:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730734AbgG3XIP (ORCPT ); Thu, 30 Jul 2020 19:08:15 -0400 Received: from inva020.nxp.com ([92.121.34.13]:42746 "EHLO inva020.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730724AbgG3XIO (ORCPT ); Thu, 30 Jul 2020 19:08:14 -0400 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id EF4F11A1498; Fri, 31 Jul 2020 01:08:05 +0200 (CEST) Received: from invc005.ap-rdc01.nxp.com (invc005.ap-rdc01.nxp.com [165.114.16.14]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id BBE2F1A0767; Fri, 31 Jul 2020 01:08:01 +0200 (CEST) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by invc005.ap-rdc01.nxp.com (Postfix) with ESMTP id 3A73F4031E; Fri, 31 Jul 2020 01:07:56 +0200 (CEST) From: Anson Huang To: wim@linux-watchdog.org, linux@roeck-us.net, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Linux-imx@nxp.com Subject: [PATCH V4 2/2] watchdog: imx7ulp: Watchdog should continue running for wait/stop mode Date: Fri, 31 Jul 2020 07:03:33 +0800 Message-Id: <1596150213-31638-2-git-send-email-Anson.Huang@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1596150213-31638-1-git-send-email-Anson.Huang@nxp.com> References: <1596150213-31638-1-git-send-email-Anson.Huang@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org When kernel idle, system will enter wait/stop mode, wdog should continue running in this scenario, and the refresh thread can wake up system from wait/stop mode. Signed-off-by: Anson Huang Reviewed-by: Guenter Roeck --- no change. --- drivers/watchdog/imx7ulp_wdt.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c index badfc0b..922b603 100644 --- a/drivers/watchdog/imx7ulp_wdt.c +++ b/drivers/watchdog/imx7ulp_wdt.c @@ -22,6 +22,8 @@ #define WDOG_CS_CLK (LPO_CLK << LPO_CLK_SHIFT) #define WDOG_CS_EN BIT(7) #define WDOG_CS_UPDATE BIT(5) +#define WDOG_CS_WAIT BIT(1) +#define WDOG_CS_STOP BIT(0) #define WDOG_CNT 0x4 #define WDOG_TOVAL 0x8 @@ -187,7 +189,8 @@ static int imx7ulp_wdt_init(void __iomem *base, unsigned int timeout) /* set an initial timeout value in TOVAL */ writel(timeout, base + WDOG_TOVAL); /* enable 32bit command sequence and reconfigure */ - val = WDOG_CS_CMD32EN | WDOG_CS_CLK | WDOG_CS_UPDATE; + val = WDOG_CS_CMD32EN | WDOG_CS_CLK | WDOG_CS_UPDATE | + WDOG_CS_WAIT | WDOG_CS_STOP; writel(val, base + WDOG_CS); imx7ulp_wdt_wait(base, WDOG_CS_RCS);