From patchwork Wed Feb 23 16:00:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 545551 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C4FDC433F5 for ; Wed, 23 Feb 2022 16:06:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239208AbiBWQGs (ORCPT ); Wed, 23 Feb 2022 11:06:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59276 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240492AbiBWQGs (ORCPT ); Wed, 23 Feb 2022 11:06:48 -0500 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id ABF07C4850 for ; Wed, 23 Feb 2022 08:06:20 -0800 (PST) X-IronPort-AV: E=Sophos;i="5.88,391,1635174000"; d="scan'208";a="111356438" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 24 Feb 2022 01:01:18 +0900 Received: from localhost.localdomain (unknown [10.226.93.140]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 1A13F4004923; Thu, 24 Feb 2022 01:01:15 +0900 (JST) From: Biju Das To: Wim Van Sebroeck , Guenter Roeck , Philipp Zabel Cc: Biju Das , linux-watchdog@vger.kernel.org, Geert Uytterhoeven , Chris Paterson , Biju Das , Prabhakar Mahadev Lad , linux-renesas-soc@vger.kernel.org Subject: [PATCH v4 5/6] watchdog: rzg2l_wdt: Use force reset for WDT reset Date: Wed, 23 Feb 2022 16:00:59 +0000 Message-Id: <20220223160100.23543-6-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220223160100.23543-1-biju.das.jz@bp.renesas.com> References: <20220223160100.23543-1-biju.das.jz@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org This patch uses the force reset(WDTRSTB) for triggering WDT reset for restart callback. This method(ie, Generate Reset (WDTRSTB) Signal on parity error)is faster compared to the overflow method for triggering watchdog reset. Overflow method: reboot: Restarting system Reboot failed -- System halted NOTICE: BL2: v2.5(release):v2.5/rzg2l-1.00-27-gf48f1440c Parity error method: reboot: Restarting system NOTICE: BL2: v2.5(release):v2.5/rzg2l-1.00-27-gf48f1440c Signed-off-by: Biju Das Reviewed-by: Geert Uytterhoeven --- V3->V4: * Renamed PEEN_FORCE_RST->PEEN_FORCE * Updated comments with parity error description * Updated commit description V2->v3: * Patch reordering from patch 4->patch 2 * Updated the commit description. V1->V2: * Updated the commit description. --- drivers/watchdog/rzg2l_wdt.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c index 73b667ed3e99..4e7107655cc2 100644 --- a/drivers/watchdog/rzg2l_wdt.c +++ b/drivers/watchdog/rzg2l_wdt.c @@ -21,8 +21,11 @@ #define WDTSET 0x04 #define WDTTIM 0x08 #define WDTINT 0x0C +#define PECR 0x10 +#define PEEN 0x14 #define WDTCNT_WDTEN BIT(0) #define WDTINT_INTDISP BIT(0) +#define PEEN_FORCE BIT(0) #define WDT_DEFAULT_TIMEOUT 60U @@ -117,17 +120,14 @@ static int rzg2l_wdt_restart(struct watchdog_device *wdev, { struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); - /* Reset the module before we modify any register */ - reset_control_reset(priv->rstc); - clk_prepare_enable(priv->pclk); clk_prepare_enable(priv->osc_clk); - /* smallest counter value to reboot soon */ - rzg2l_wdt_write(priv, WDTSET_COUNTER_VAL(1), WDTSET); + /* Generate Reset (WDTRSTB) Signal on parity error */ + rzg2l_wdt_write(priv, 0, PECR); - /* Enable watchdog timer*/ - rzg2l_wdt_write(priv, WDTCNT_WDTEN, WDTCNT); + /* Force parity error */ + rzg2l_wdt_write(priv, PEEN_FORCE, PEEN); return 0; }