From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lr2-f35.google.com (mail-lr2-f35.google.com [74.125.230.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E135853B353 for ; Tue, 29 Sep 2026 16:52:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.230.99 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790700757; cv=none; b=KFY6sUG2CHSzR+GPNHtxQOiXqwoCJPvut6ApE8dFbW4Kl8m2DP2MXn5qshlZDC36SzjCYuyFNFzq7ynuVwdiKsweG8u6KdDYGVH9GEJessZaRRX8EZkn4MNRTEguVwcZSdliJ527drmZrKod34rjzod8Q/VIzuuNQZT+UJ8CCpM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790700757; c=relaxed/simple; bh=r7rAzsQj8tq8hOzCk4tA2IJiAq9Flk3ypaIF/m8Mhtw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ll3SLRk8aM5BQfqm+tbhgu2W9O7+zA8/8fhHXPJXdkCAZdJChKCnguKal3YN3KW5A5smio7W7ktv8Zm1bRsCKNaOZgK4LWNsezfknlmHGnQeIi/isUqRokKs+dwzs7qMGBZx1JdudSsOi9jFw7KRbvZDETDyZBwP5402WCWL00o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ZPsAGEvd; arc=none smtp.client-ip=74.125.230.99 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZPsAGEvd" Received: by mail-lr2-f35.google.com with SMTP id 38308e7fff4ca-3a612404718so41515991fa.2 for ; Tue, 29 Sep 2026 09:52:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1790700752; x=1791305552; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=bPqwF7x5ZyfbIT2MUR02hgJRce/NwkKWQi9i+m/u9W0=; b=ZPsAGEvdr43qCCdPEzz7iTuer1yc3ntzFxSMFT7YfJSdpDCPS+Jj0RF96WIQYcfb5X W20q5DgPzdzUXA0SNc4u0FEwsgqCijXm9FguDLliQ//rGPAjOzML4V24d2QNtBSkwdkK 2rgT+abjmmXQ7V+KVIkCUzJtR2nEzVA/ULJG8APgvzuYa+nUSq6g2gZnqRD7rbnj8l9K Gb6Wg4ojXu2guiaoEb3W1K0c8JmCHIifGEf/FTRh9uAZcYvmhoVwnlhr1dGSJ/cW+/XT MZWSIOH2Ty7W+uw+TBdZxWzN/gnvo4OjaCU41b+wdatjoCsAmdvxKP7ktmmZaWR8BsZk lcxg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790700752; x=1791305552; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=bPqwF7x5ZyfbIT2MUR02hgJRce/NwkKWQi9i+m/u9W0=; b=IxHDdBt0WpYAeyse7o7mwOBBx8suSP7XucTpPLAMatPJKL9/XTLnU7EVgI8SBthLH5 dxPorXu9JCHGrXbXo9dUDBAfW5d7aFdw81JnYBDoZgM6h4PU7whbj3f6164NYV7z78i6 gbtVHbWNxhW41KR49frced8zp9jWrU/w2AGxkryIziyRCynvxguHggO8iFB49oMHdD80 0tB9PtK3iyWyW3uSy3eaGntFbmvu+7oGbY2uztUzDIXvFrS72/As1ARt2qE/YwqnqiZL KAJg2IOF0TdzMQrFuWqlk49graX4pvINCJ9rKDNxyCzhecfyAdwuUDmVWZMGenQv02qs DRCA== X-Forwarded-Encrypted: i=1; AKwUvBzp1npv/lfDGS3kboA47kj/JKeRRAwpJmFwNiUCerIPg3FsRn/qfun6gqSNWqrvCOhQy8v3hw87x5refGQ=@vger.kernel.org X-Gm-Message-State: AFq9FYJw8VIgE44TbflGSGz8MqCx5jefVhz3ayYmYOgC/btU6JzLVWGB qJ8WKrbzZwX8JiTFHbBLm1lwCUo99CPtGKCa9gX9QUXMh5xTwusTPPzEGf3tf9g= X-Gm-Gg: AYBFou2uYoTzjdLdRyWfbb5Ecoac5uNAZ19vFFkuNnyEsxre6gakJ9kMLs+UGWgi2/l rN2hO0Qn0n+Fpm+ZqTkln59oxpFBnJxVoulw3UWd502NTFuFm50DzZN/feic6ez0BgMInU/TyOi cvdTxk4qU3wDqrAhmzvHUwFj9Zax6zlp4yDTIwpHiSLjHdO/RFiYYC91Ao/DonczuCmmzNbID1D lteIfJklEFgrmz3QEyZI9dKu5QheLhrdKjx5exxqglN22RP7VAyKEpf6j4Lcf22Bhr+mTaYFvdn WvvybsNSwqDW5t4Su4GWXK1t2I5aj81L95ac03Gp/A5eHmNEvBOcpf61BEJWiuhJ8CtxfMkrH5P j0FPo2XN7aePLX4tZsnxpfMeFg3Vyoo32aTIdkqK/8/P6UrV9K/Ct+lpCffit29IsSS32dYgMXn kciY80Xb79vyotOSNLiNwj1CNoL2rbikmgkqUV5Qggb9JZh2BdczKxnk4DxQWm X-Received: by 2002:a05:651c:c85:b0:3a6:6aad:be56 with SMTP id 38308e7fff4ca-3a771a5d025mr218461fa.22.1790700751777; Tue, 29 Sep 2026 09:52:31 -0700 (PDT) Received: from fedora ([46.8.219.5]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-3a771947b14sm137751fa.32.2026.09.29.09.52.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Sep 2026 09:52:31 -0700 (PDT) From: Vitaliy Sochnev To: "Rafael J. Wysocki" , Daniel Lezcano Cc: Zhang Rui , Lukasz Luba , Christian Marangi , Lorenzo Bianconi , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Vitaliy Sochnev Subject: [PATCH v3 2/4] thermal/drivers/airoha: Serialise access to the shared ADC Date: Tue, 29 Sep 2026 19:52:07 +0300 Message-ID: <20260929165209.69669-3-sochnev.v.74@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260929165209.69669-1-sochnev.v.74@gmail.com> References: <20260929165209.69669-1-sochnev.v.74@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit A read selects the sensor and walks three diodes with a 10 ms settle on each. The zone lock serialises reads of one zone. With a zone per AN7583 sensor, added later in this series, reads of different zones interleave and convert samples taken at another mux position. Mux writes are dropped silently unless PLLRG_PROTECT is lifted, and its save and restore do not nest. The cached TADC value also skips a write after another reader has moved the mux. With the AN7583 sensors read as parallel zones during CPU frequency changes, a zone crossed its critical trip on a chip at 55 C and the board shut down. Serialise the sequence, drop the cache, check the selection after writing and after sampling, and return -EAGAIN if it does not hold. Signed-off-by: Vitaliy Sochnev --- drivers/thermal/airoha_thermal.c | 85 +++++++++++++++++++++++++------- 1 file changed, 68 insertions(+), 17 deletions(-) diff --git a/drivers/thermal/airoha_thermal.c b/drivers/thermal/airoha_thermal.c index 1b187c41baea..0f0e6f3af3cd 100644 --- a/drivers/thermal/airoha_thermal.c +++ b/drivers/thermal/airoha_thermal.c @@ -5,6 +5,7 @@ #include #include #include +#include #include #include #include @@ -191,6 +192,7 @@ #define AN7583_NUM_SENSOR 3 #define AIROHA_THERMAL_NO_MUX_SENSOR -1 +#define AIROHA_THERMAL_MUX_TRIES 3 /* Convert temp to raw value as read from ADC ((((temp / 100) - init) * slope) / 1000) + offset */ #define TEMP_TO_RAW(priv, temp) ((((((temp) / 100) - (priv)->init_temp) * \ @@ -250,7 +252,8 @@ struct airoha_thermal_priv { struct resource scu_adc_res; u32 pllrg_protect; - int current_adc; + /* Serialises mux selection and ADC sampling */ + struct mutex lock; struct thermal_zone_device *tz; int init_temp; @@ -294,9 +297,26 @@ static int airoha_get_thermal_ADC(struct airoha_thermal_priv *priv) return val; } +static bool airoha_thermal_mux_holds(struct airoha_thermal_priv *priv, + int tdac_idx, int sensor_idx) +{ + unsigned int val; + + if (regmap_field_read(priv->chip_scu_fields[AIROHA_THERMAL_MUX_TADC], &val) || + val != tdac_idx) + return false; + + if (sensor_idx == AIROHA_THERMAL_NO_MUX_SENSOR) + return true; + + return !regmap_field_read(priv->chip_scu_fields[AIROHA_THERMAL_MUX_SENSOR], &val) && + val == sensor_idx; +} + static void airoha_set_thermal_mux(struct airoha_thermal_priv *priv, int tdac_idx, int sensor_idx) { + int tries = AIROHA_THERMAL_MUX_TRIES; u32 pllrg; /* Save PLLRG current value */ @@ -307,19 +327,17 @@ static void airoha_set_thermal_mux(struct airoha_thermal_priv *priv, priv->pllrg_protect); /* - * Configure Thermal Sensor mux to sensor_idx. + * Configure Thermal Sensor mux to sensor_idx and Thermal ADC mux to + * tdac_idx. Writes can be dropped silently, so read them back. * (if not supported, sensor_idx is AIROHA_THERMAL_NO_MUX_SENSOR) */ - if (sensor_idx != AIROHA_THERMAL_NO_MUX_SENSOR) - regmap_field_write(priv->chip_scu_fields[AIROHA_THERMAL_MUX_SENSOR], - sensor_idx); - - /* Configure Thermal ADC mux to tdac_idx */ - if (priv->current_adc != tdac_idx) { + do { + if (sensor_idx != AIROHA_THERMAL_NO_MUX_SENSOR) + regmap_field_write(priv->chip_scu_fields[AIROHA_THERMAL_MUX_SENSOR], + sensor_idx); regmap_field_write(priv->chip_scu_fields[AIROHA_THERMAL_MUX_TADC], tdac_idx); - priv->current_adc = tdac_idx; - } + } while (!airoha_thermal_mux_holds(priv, tdac_idx, sensor_idx) && --tries); /* Restore PLLRG value on exit */ regmap_write(priv->chip_scu, EN7581_PLLRG_PROTECT, pllrg); @@ -596,12 +614,40 @@ static int en7581_thermal_post_probe(struct platform_device *pdev) return 0; } +static int an7583_thermal_read_diode(struct airoha_thermal_priv *priv, + int diode, int sensor_idx, int *val) +{ + airoha_set_thermal_mux(priv, diode, sensor_idx); + *val = airoha_get_thermal_ADC(priv); + + return airoha_thermal_mux_holds(priv, diode, sensor_idx) ? 0 : -EAGAIN; +} + +static int an7583_thermal_read_diodes(struct airoha_thermal_priv *priv, + int sensor_idx, int *zero, int *d0, + int *d1) +{ + int ret; + + ret = an7583_thermal_read_diode(priv, AN7583_ZERO_TADC, sensor_idx, zero); + if (ret) + return ret; + + ret = an7583_thermal_read_diode(priv, AN7583_D0_TADC, sensor_idx, d0); + if (ret) + return ret; + + return an7583_thermal_read_diode(priv, AN7583_D1_TADC, sensor_idx, d1); +} + static int an7583_thermal_get_temp(struct thermal_zone_device *tz, int *temp) { struct airoha_thermal_priv *priv = thermal_zone_device_priv(tz); int sensor_idx; int delta_diode, delta_gain; int coeff, slope, offset; + int tries = AIROHA_THERMAL_MUX_TRIES; + int ret; int diode_zero, diode_d0, diode_d1; @@ -612,12 +658,14 @@ static int an7583_thermal_get_temp(struct thermal_zone_device *tz, int *temp) slope = an7583_thermal_slope[sensor_idx]; offset = an7583_thermal_offset[sensor_idx]; - airoha_set_thermal_mux(priv, AN7583_ZERO_TADC, sensor_idx); - diode_zero = airoha_get_thermal_ADC(priv); - airoha_set_thermal_mux(priv, AN7583_D0_TADC, sensor_idx); - diode_d0 = airoha_get_thermal_ADC(priv); - airoha_set_thermal_mux(priv, AN7583_D1_TADC, sensor_idx); - diode_d1 = airoha_get_thermal_ADC(priv); + mutex_lock(&priv->lock); + do { + ret = an7583_thermal_read_diodes(priv, sensor_idx, &diode_zero, + &diode_d0, &diode_d1); + } while (ret == -EAGAIN && --tries); + mutex_unlock(&priv->lock); + if (ret) + return ret; delta_diode = diode_d1 - diode_d0; delta_gain = (delta_diode * coeff) / 100 + (diode_zero - diode_d1); @@ -678,7 +726,10 @@ static int airoha_thermal_probe(struct platform_device *pdev) return -ENOMEM; priv->pllrg_protect = soc_data->pllrg_protect; - priv->current_adc = -1; + + ret = devm_mutex_init(dev, &priv->lock); + if (ret) + return ret; if (!soc_data->probe) return -EINVAL; -- 2.55.0