From patchwork Mon Dec 13 15:26:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 523883 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 245F5C4332F for ; Mon, 13 Dec 2021 15:27:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240085AbhLMP1I (ORCPT ); Mon, 13 Dec 2021 10:27:08 -0500 Received: from relmlor1.renesas.com ([210.160.252.171]:60167 "EHLO relmlie5.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S234672AbhLMP1I (ORCPT ); Mon, 13 Dec 2021 10:27:08 -0500 X-IronPort-AV: E=Sophos;i="5.88,202,1635174000"; d="scan'208";a="103326599" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 14 Dec 2021 00:27:06 +0900 Received: from localhost.localdomain (unknown [10.226.92.170]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id C2CC440078D4; Tue, 14 Dec 2021 00:27:03 +0900 (JST) From: Biju Das To: Wim Van Sebroeck , Guenter Roeck 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 v2 2/4] watchdog: rzg2l_wdt: Add error check for reset_control_{deassert/reset} Date: Mon, 13 Dec 2021 15:26:56 +0000 Message-Id: <20211213152658.26225-2-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211213152658.26225-1-biju.das.jz@bp.renesas.com> References: <20211213152658.26225-1-biju.das.jz@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org If reset_control_deassert() fails, then we won't be able to access the device registers. Therefore check the return code of reset_control_deassert() and bail out in case of error. While at it remove the unnecessary pm_runtime_resume_and_get() from probe(), as it turns on the clocks. Replace reset_control_assert()->reset_control_reset() in rzg2l_wdt _stop() and remove the unnecessary reset_control_deassert() from rzg2l_wdt_start(). Also add error check for reset_control_reset() Signed-off-by: Biju Das --- v1->v2: * Updated commit description and removed Rb tag from Guenter, since there is code change * Replaced reset_control_assert with reset_control_reset in stop and removed reset_control_deassert() from start. * --- drivers/watchdog/rzg2l_wdt.c | 34 +++++++++++++++------------------- 1 file changed, 15 insertions(+), 19 deletions(-) diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c index 96f2a018ab62..0e62d7be153c 100644 --- a/drivers/watchdog/rzg2l_wdt.c +++ b/drivers/watchdog/rzg2l_wdt.c @@ -86,7 +86,6 @@ static int rzg2l_wdt_start(struct watchdog_device *wdev) { struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); - reset_control_deassert(priv->rstc); pm_runtime_get_sync(wdev->parent); /* Initialize time out */ @@ -106,18 +105,24 @@ static int rzg2l_wdt_stop(struct watchdog_device *wdev) struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); pm_runtime_put(wdev->parent); - reset_control_assert(priv->rstc); - return 0; + /* Reset the module for stopping watchdog */ + return reset_control_reset(priv->rstc); } static int rzg2l_wdt_restart(struct watchdog_device *wdev, unsigned long action, void *data) { struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); + int ret; /* Reset the module before we modify any register */ - reset_control_reset(priv->rstc); + ret = reset_control_reset(priv->rstc); + if (ret) { + dev_err(wdev->parent, "failed to reset"); + return ret; + } + pm_runtime_get_sync(wdev->parent); /* smallest counter value to reboot soon */ @@ -151,12 +156,11 @@ static const struct watchdog_ops rzg2l_wdt_ops = { .restart = rzg2l_wdt_restart, }; -static void rzg2l_wdt_reset_assert_pm_disable_put(void *data) +static void rzg2l_wdt_reset_assert_pm_disable(void *data) { struct watchdog_device *wdev = data; struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); - pm_runtime_put(wdev->parent); pm_runtime_disable(wdev->parent); reset_control_assert(priv->rstc); } @@ -204,13 +208,11 @@ static int rzg2l_wdt_probe(struct platform_device *pdev) return dev_err_probe(&pdev->dev, PTR_ERR(priv->rstc), "failed to get cpg reset"); - reset_control_deassert(priv->rstc); + ret = reset_control_deassert(priv->rstc); + if (ret) + return dev_err_probe(dev, ret, "failed to deassert"); + pm_runtime_enable(&pdev->dev); - ret = pm_runtime_resume_and_get(&pdev->dev); - if (ret < 0) { - dev_err(dev, "pm_runtime_resume_and_get failed ret=%pe", ERR_PTR(ret)); - goto out_pm_get; - } priv->wdev.info = &rzg2l_wdt_ident; priv->wdev.ops = &rzg2l_wdt_ops; @@ -222,7 +224,7 @@ static int rzg2l_wdt_probe(struct platform_device *pdev) watchdog_set_drvdata(&priv->wdev, priv); ret = devm_add_action_or_reset(&pdev->dev, - rzg2l_wdt_reset_assert_pm_disable_put, + rzg2l_wdt_reset_assert_pm_disable, &priv->wdev); if (ret < 0) return ret; @@ -235,12 +237,6 @@ static int rzg2l_wdt_probe(struct platform_device *pdev) dev_warn(dev, "Specified timeout invalid, using default"); return devm_watchdog_register_device(&pdev->dev, &priv->wdev); - -out_pm_get: - pm_runtime_disable(dev); - reset_control_assert(priv->rstc); - - return ret; } static const struct of_device_id rzg2l_wdt_ids[] = {