From patchwork Thu Aug 24 12:21:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabio Estevam X-Patchwork-Id: 13364065 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 E9BCBC3DA6F for ; Thu, 24 Aug 2023 12:21:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232868AbjHXMVT (ORCPT ); Thu, 24 Aug 2023 08:21:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38720 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241401AbjHXMVO (ORCPT ); Thu, 24 Aug 2023 08:21:14 -0400 Received: from mail-oi1-x22c.google.com (mail-oi1-x22c.google.com [IPv6:2607:f8b0:4864:20::22c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C351170F; Thu, 24 Aug 2023 05:21:13 -0700 (PDT) Received: by mail-oi1-x22c.google.com with SMTP id 5614622812f47-3a889485117so144206b6e.1; Thu, 24 Aug 2023 05:21:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1692879672; x=1693484472; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=IJjDYi526dyuJbfu3Q5q3ouhJnvi2sl1oLR0pSnKiyU=; b=sF5xKaY4i/UT1PG06J41CVtupxPri04W6rl7Bfa09jSrcE6q0NWlIooS3QWq7T/NVi r2Qw0bBNio99KKgg3p7xVZdjKhaJsBs5iBNWEN0sdBhW/XkkymfuZKNrTXitcwZIwR9/ h6Wjg/Qi98rut3a2j9KFjVyhFX29eV8cAqYEmVEfpkpCsZSooEPmDqXdKLMmG52FGcE4 EO+B1iI6NhFsiXOkFqWEqUL9x80AdGsgILLoLhejKt6+kN+L22ixCSF+FBkaGfGpB1Ci tsGu8QKFpFNPxBLRbKyWIS7UCzljhrvpOr3NuhSmdc5XuGMvzYvvPYCVG/Inrk6Yr8C/ dvOQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692879672; x=1693484472; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=IJjDYi526dyuJbfu3Q5q3ouhJnvi2sl1oLR0pSnKiyU=; b=mAeuXk4YLptL3v2JMXh+xZNKC4d/H6SIewZuKb+/ZYp/5802q/Fs3c01LZon1pCtWk 1Rg8P7UqiYYexjA0RauZ+F9ni9WV6IUTC9e137rddpWd/oLfQ72X345wIGqnqNeK0byZ Aphzb7iRkw6TJbXKuS9Js1Q3MiijXFXmU4bWNaS9CsmjFJdip738QjjeK8Rlf/9rAlk/ rsJsYdjK5z6sKoexqQM8vvuqLtcIki5L4s3IETu8Unnsv4Iq/70US8jMVyHZsOnBWwIg HAyeKuMDFUZvaKUC9MWMOPshRXXug4vE8buPDHJckbVrczBVTrWOqFlzBvpu69lLSFUG Ub5w== X-Gm-Message-State: AOJu0YxjVpmSVwtVHY0TMP62VHdBmKOFoSjqAbTCu370UzPDqFxnKwj1 s92/5xzJN9ug5rjoNpjq248= X-Google-Smtp-Source: AGHT+IFqNdELyxrV5wVgVO4XIymYcMbmcoYapnlSHCSOVP0vvdvUlyDC7hldV4I12jOh/w/QRSwVnA== X-Received: by 2002:a05:6808:2009:b0:3a8:901e:c5a with SMTP id q9-20020a056808200900b003a8901e0c5amr1972605oiw.0.1692879672474; Thu, 24 Aug 2023 05:21:12 -0700 (PDT) Received: from fabio-Precision-3551.. ([2804:14c:485:4b61:8c51:3a01:4599:db3]) by smtp.gmail.com with ESMTPSA id a18-20020a05680804d200b003a862e70bcbsm3747170oie.13.2023.08.24.05.21.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Aug 2023 05:21:11 -0700 (PDT) From: Fabio Estevam To: daniel.lezcano@linaro.org Cc: linux-pm@vger.kernel.org, rafael@kernel.org, amitk@kernel.org, rui.zhang@intel.com, linux-kernel@vger.kernel.org, Fabio Estevam Subject: [PATCH v3] thermal: imx8mm: Allow reboot after critical temperature Date: Thu, 24 Aug 2023 09:21:02 -0300 Message-Id: <20230824122102.474550-1-festevam@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Fabio Estevam Currently, after the SoC reaches the critical temperature, the board goes through a poweroff mechanism. In some cases, such behavior does not suit well, as the board may be unattended in the field and rebooting may be a better approach. The bootloader may also check the temperature and only allow the boot to proceed when the temperature is below a certain threshold. Introduce a reboot_on_critical parameter to indicate that the board will go through a reboot after the critical temperature is reached. When this parameter is not passed, the default behavior of forcing a shutdown is preserved. Tested on a imx8mm-evk board by passing 'imx8mm_thermal.reboot_on_critical' via kernel command line. Signed-off-by: Fabio Estevam --- Changes since v2: - Set the .critical ops at init time and get rid of the thermal_zone_device_critical(tz) call. (Daniel) drivers/thermal/imx8mm_thermal.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/drivers/thermal/imx8mm_thermal.c b/drivers/thermal/imx8mm_thermal.c index e89b11b3f2b9..f156e6e81abc 100644 --- a/drivers/thermal/imx8mm_thermal.c +++ b/drivers/thermal/imx8mm_thermal.c @@ -10,9 +10,11 @@ #include #include #include +#include #include #include #include +#include #include #include @@ -75,6 +77,11 @@ #define TMU_VER1 0x1 #define TMU_VER2 0x2 +static bool reboot_on_critical; +module_param(reboot_on_critical, bool, 0444); +MODULE_PARM_DESC(reboot_on_critical, + "Reboot the system after the critical temperature is reached."); + struct thermal_soc_data { u32 num_sensors; u32 version; @@ -146,7 +153,7 @@ static int tmu_get_temp(struct thermal_zone_device *tz, int *temp) return tmu->socdata->get_temp(sensor, temp); } -static const struct thermal_zone_device_ops tmu_tz_ops = { +static struct thermal_zone_device_ops tmu_tz_ops = { .get_temp = tmu_get_temp, }; @@ -293,6 +300,13 @@ static int imx8mm_tmu_probe_set_calib(struct platform_device *pdev, return imx8mm_tmu_probe_set_calib_v2(pdev, tmu); } +static void tmu_critical(struct thermal_zone_device *tz) +{ + dev_emerg(thermal_zone_device(tz), "%s: critical temperature reached\n", + thermal_zone_device_type(tz)); + kernel_restart(NULL); +} + static int imx8mm_tmu_probe(struct platform_device *pdev) { const struct thermal_soc_data *data; @@ -327,6 +341,9 @@ static int imx8mm_tmu_probe(struct platform_device *pdev) /* disable the monitor during initialization */ imx8mm_tmu_enable(tmu, false); + if (reboot_on_critical) + tmu_tz_ops.critical = tmu_critical; + for (i = 0; i < data->num_sensors; i++) { tmu->sensors[i].priv = tmu; tmu->sensors[i].tzd =