From patchwork Mon Jan 18 09:45:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 12026931 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BED04C433E9 for ; Mon, 18 Jan 2021 10:47:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85D692222F for ; Mon, 18 Jan 2021 10:47:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389078AbhARKro (ORCPT ); Mon, 18 Jan 2021 05:47:44 -0500 Received: from www.zeus03.de ([194.117.254.33]:47934 "EHLO mail.zeus03.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389257AbhARJqu (ORCPT ); Mon, 18 Jan 2021 04:46:50 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=sang-engineering.com; h= from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; s=k1; bh=FSLRqQVx5AIjHrzsXlHfYW1hoLX /ybhefgKMMKyZ9Kk=; b=lw1nL1iugO/W2prcUTYf9ulmUZYt6lj73VHtoUUQOoR 9k7VkYLjW+6//FwkeEXYH3nqgp1p/4F0BIc+U6sjfBd9D7vPE+q106nRWHvdsGeC 9KyIz9mP3hH8Vs4PZVq6gy0nVX96gN4KAKN0sXjCNWbhws22G6XnCnY1ahQMgqOQ = Received: (qmail 647582 invoked from network); 18 Jan 2021 10:46:08 +0100 Received: by mail.zeus03.de with ESMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 18 Jan 2021 10:46:08 +0100 X-UD-Smtp-Session: l3s3148p1@ublqlym51oYgAwDPXwacAOByz8F9Mgm1 From: Wolfram Sang To: linux-watchdog@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Wolfram Sang Subject: [PATCH] watchdog: renesas_wdt: add grace period before rebooting Date: Mon, 18 Jan 2021 10:45:58 +0100 Message-Id: <20210118094558.36814-1-wsa+renesas@sang-engineering.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org arm64 does not have a grace period after calling reset handlers. It is rightfully assumed that watchdog drivers should wait because they know the time needed. Implement this for the Renesas watchdog driver. Signed-off-by: Wolfram Sang Reviewed-by: Guenter Roeck --- drivers/watchdog/renesas_wdt.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c index d2b5074bca65..5791198960e6 100644 --- a/drivers/watchdog/renesas_wdt.c +++ b/drivers/watchdog/renesas_wdt.c @@ -151,6 +151,9 @@ static int rwdt_restart(struct watchdog_device *wdev, unsigned long action, rwdt_write(priv, RWTCSRA_TME, RWTCSRA); + /* wait 2 cycles, so watchdog will trigger */ + udelay(DIV_ROUND_UP(2 * 1000000, priv->clk_rate)); + return 0; }