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[87.0.193.30]) by smtp.googlemail.com with ESMTPSA id k6sm105954edv.77.2021.09.07.14.26.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Sep 2021 14:26:04 -0700 (PDT) From: Ansuel Smith To: Andy Gross , Bjorn Andersson , Amit Kucheria , Thara Gopinath , Zhang Rui , Daniel Lezcano , linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Ansuel Smith , Matthias Kaehlcke Subject: [PATCH v2 1/2] drivers: thermal: tsens: fix wrong check for tzd in irq handlers Date: Tue, 7 Sep 2021 23:25:42 +0200 Message-Id: <20210907212543.20220-1-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Some device can have some thermal sensor disabled from the factory. The current 2 irq handler functions check all the sensor by default and the check if the sensor was actually registered is wrong. The tzd is actually never set if the registration fail hence the IS_ERR check is wrong. Signed-off-by: Ansuel Smith Reviewed-by: Matthias Kaehlcke --- drivers/thermal/qcom/tsens.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c index 4c7ebd1d3f9c..b1162e566a70 100644 --- a/drivers/thermal/qcom/tsens.c +++ b/drivers/thermal/qcom/tsens.c @@ -417,7 +417,7 @@ static irqreturn_t tsens_critical_irq_thread(int irq, void *data) const struct tsens_sensor *s = &priv->sensor[i]; u32 hw_id = s->hw_id; - if (IS_ERR(s->tzd)) + if (!s->tzd) continue; if (!tsens_threshold_violated(priv, hw_id, &d)) continue; @@ -467,7 +467,7 @@ static irqreturn_t tsens_irq_thread(int irq, void *data) const struct tsens_sensor *s = &priv->sensor[i]; u32 hw_id = s->hw_id; - if (IS_ERR(s->tzd)) + if (!s->tzd) continue; if (!tsens_threshold_violated(priv, hw_id, &d)) continue; From patchwork Tue Sep 7 21:25:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Marangi X-Patchwork-Id: 12479359 X-Patchwork-Delegate: daniel.lezcano@linaro.org 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 C3A6AC4332F for ; Tue, 7 Sep 2021 21:26:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A1A4260F43 for ; Tue, 7 Sep 2021 21:26:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347194AbhIGV1P (ORCPT ); Tue, 7 Sep 2021 17:27:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54980 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347162AbhIGV1O (ORCPT ); Tue, 7 Sep 2021 17:27:14 -0400 Received: from mail-ej1-x632.google.com (mail-ej1-x632.google.com [IPv6:2a00:1450:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3357AC061575; Tue, 7 Sep 2021 14:26:07 -0700 (PDT) Received: by mail-ej1-x632.google.com with SMTP id jg16so998394ejc.1; Tue, 07 Sep 2021 14:26:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=vXNO3olbtma7hE++jUWc8ulS7UJFRFsM1r+fEg/Xcr4=; b=HAVHm8zN9QEe7OrVNoo+oKh4DguUxWBObO+mW8cUZbceKX0u4PqXMzCnOUmyaGzfRX zYSYgRhUgH5K1QHLtrD/Oitonl8impOAq46EeEiZDmb+B2floTTd8hvhRHkyXniyK8cU +Sgxzks3H7DQil7UiUjiLl0eJF0WCGOFWp140DuhgFIHvVs11VmPVuZ5KMNSzalBvTZ/ wbNvY/fi6V1OtPsY+hKuk/ovxu3Pnnz20a7RLlJW3tF70g81/YXM1xbmN1w37V2mLZhd 1EiC3EDfb2MljCQRrkQpiqY/RYE+xMVReUWEV6hbCrx5B7ZGEFCxTmc18wCg+P3tEENw L/yA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=vXNO3olbtma7hE++jUWc8ulS7UJFRFsM1r+fEg/Xcr4=; b=IBB1hcMLw3nf7Bj2xa+76QlL3G04s7ND/MYiXgcFixZxv8YshwgGh8Po0haiVMxmks sKRJ9sHydv82EBeK/Xk7nPEpbyeH5XA+nEiP8TWDd17IbtvDZYEuHgP+0WWLciNUurFZ 75QtZSOjIGuVj1nxmfoFCIvqnCWUhd5+o6gQHICzOA7eJya6Ltk/g+DjRpfYMhYTzoWv el44BAHlYZ9ETCvpedctVxdHHEzknd+Ch5ApUcQ4ci+m4jEUUZNtCs7cxPTJQPUz8o88 3WhG6gC1S30k8b/Gy2SB5LJci51lv3FrvvEQ3jo7JwJQKRMeEnjOPe/P0/zlo5TWzniJ lXrw== X-Gm-Message-State: AOAM532dqdGSwMzHQrHUiStPqJGOXxm1xsWOgplmlD73f8Bgy8W9RWSS iJB/qXkrhSAepeq5/GXgNVw= X-Google-Smtp-Source: ABdhPJyPV8hLqzZZs74jWSed62ing6ThzHcIExC67z5gLH5M8CmTD/ZC1M/mFQdvLFp6AdlyxFQkvA== X-Received: by 2002:a17:906:7848:: with SMTP id p8mr410174ejm.212.1631049965630; Tue, 07 Sep 2021 14:26:05 -0700 (PDT) Received: from Ansuel-xps.localdomain (host-87-0-193-30.retail.telecomitalia.it. [87.0.193.30]) by smtp.googlemail.com with ESMTPSA id k6sm105954edv.77.2021.09.07.14.26.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Sep 2021 14:26:05 -0700 (PDT) From: Ansuel Smith To: Andy Gross , Bjorn Andersson , Amit Kucheria , Thara Gopinath , Zhang Rui , Daniel Lezcano , linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Ansuel Smith Subject: [PATCH v2 2/2] drivers: thermal: tsens: add timeout to get_tem_tsens_valid Date: Tue, 7 Sep 2021 23:25:43 +0200 Message-Id: <20210907212543.20220-2-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210907212543.20220-1-ansuelsmth@gmail.com> References: <20210907212543.20220-1-ansuelsmth@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The function can loop and lock the system if for whatever reason the bit for the target sensor is NEVER valid. This is the case if a sensor is disabled by the factory and the valid bit is never reported as actually valid. Add a timeout check and exit if a timeout occurs. As this is a very rare condition, handle the timeout only if the first read fails. While at it also rework the function to improve readability. Signed-off-by: Ansuel Smith --- drivers/thermal/qcom/tsens.c | 40 +++++++++++++++++++++++------------- 1 file changed, 26 insertions(+), 14 deletions(-) diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c index b1162e566a70..1ff244176beb 100644 --- a/drivers/thermal/qcom/tsens.c +++ b/drivers/thermal/qcom/tsens.c @@ -599,26 +599,38 @@ int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp) int hw_id = s->hw_id; u32 temp_idx = LAST_TEMP_0 + hw_id; u32 valid_idx = VALID_0 + hw_id; + unsigned long timeout; u32 valid; int ret; /* VER_0 doesn't have VALID bit */ - if (tsens_version(priv) >= VER_0_1) { + if (tsens_version(priv) == VER_0) + goto get_temp; + + ret = regmap_field_read(priv->rf[valid_idx], &valid); + if (ret || valid) + goto check_valid; + + timeout = jiffies + msecs_to_jiffies(20); + do { + /* Valid bit is 0 for 6 AHB clock cycles. + * At 19.2MHz, 1 AHB clock is ~60ns. + * We should enter this loop very, very rarely. + */ + ndelay(400); ret = regmap_field_read(priv->rf[valid_idx], &valid); - if (ret) - return ret; - while (!valid) { - /* Valid bit is 0 for 6 AHB clock cycles. - * At 19.2MHz, 1 AHB clock is ~60ns. - * We should enter this loop very, very rarely. - */ - ndelay(400); - ret = regmap_field_read(priv->rf[valid_idx], &valid); - if (ret) - return ret; - } - } + if (ret || valid) + goto check_valid; + } while (time_before(jiffies, timeout)); + + return -ETIMEDOUT; + +check_valid: + /* Check ret of valid bit read */ + if (ret) + return ret; +get_temp: /* Valid bit is set, OK to read the temperature */ *temp = tsens_hw_to_mC(s, temp_idx);