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Tue, 14 Jul 2026 12:37:15 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1784025435; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1fJftTlqcE8eGqPtuk9WNWMOkdgjG7MBJckMaW+Ctd4=; b=yjCk071X+S4HfzaHmqtjhvuSeEbGlGnYTbaY9AzfBzULBfWei2jZwsSwtScHtZ3WtJuVKz DkIK3HyDU6JOLOhI+zu/38QN3BeaEX4gHoE7JFTJWPShdJf2WfTm7tiLUtGfmK+cIykg/E +e1qlSXSs6GRBYVotVNAa+rO8bq6p4brai7k4VaQsBZW/v2qN7IoMS2bu1hDSXb1AQ3+2C 13e60lwZYNqxvsr2CY1yxcOpeGQY8KIE+LHGFL0H1mgpaNmTX2jz6sALoSI7j9gSrf+8Ai O0G4hwMGpPJy/my2bbXjA8pxRey7qNCUR7Npro88+gpDXPBvIe6r23YgBX2UPQ== Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1784025433; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1fJftTlqcE8eGqPtuk9WNWMOkdgjG7MBJckMaW+Ctd4=; b=V5T5SpTduNeivrpuenzg45SjjTyc8GkSKnn3uTMiGldsqUP9gNRJl0cyId5d+yelfTi6XT rPVPXo6uc+6yxydWEMrHqmFOt+4Bx05i+amAk+2zQ6YllKqiWAt3qM05J8thgofCGFxN8x Y+BHe4jy2Nurb6fFVRK/JHL8kw+sXEuRtaxTL94eS8ukPBxJ4JtjPsBWE4nftpG6JbgfDU 7EnIfrppq1zILJ81GDS9DPuvQkidImOdidp6OONjdFJ65eXuHA0RM3Lf8oNTmqYjKJaWfQ wBDVophvGdyV1fv1B8Qv8ocj/hJG7lS6twlj7eHIXzZdWnR6COg4o3vygmEjkw== Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Tue, 14 Jul 2026 18:36:59 +0800 Message-Id: Subject: Re: [PATCH] thermal: spacemit: k1: disable hardware on driver remove From: "Shuwei Wu" To: "Pei Xiao" , , , , , , , , References: <1db7d94eeaced9a92e3670d28e0c97c22f15f108.1783931396.git.xiaopei01@kylinos.cn> In-Reply-To: <1db7d94eeaced9a92e3670d28e0c97c22f15f108.1783931396.git.xiaopei01@kylinos.cn> X-MBO-RS-META: dawor4uopnap8bhihc8hfk6snj5jbmo4 X-MBO-RS-ID: 9c12ea2705f8e50f429 Hi Pei, On Mon Jul 13, 2026 at 4:32 PM CST, Pei Xiao wrote: > The driver uses devm_request_threaded_irq() but never disables the > hardware interrupt enable, sensor enable, or sensor power bits when > the driver is unbound. > > Add a devm action that clears K1_TSENSOR_INT_EN_REG, > K1_TSENSOR_EN_ALL, and K1_TSENSOR_PCTRL_ENABLE on remove, mirroring > what k1_tsensor_init() sets up. > > Signed-off-by: Pei Xiao > --- > drivers/thermal/spacemit/k1_tsensor.c | 27 +++++++++++++++++++++++++++ > 1 file changed, 27 insertions(+) > > diff --git a/drivers/thermal/spacemit/k1_tsensor.c b/drivers/thermal/spac= emit/k1_tsensor.c > index 79222d233129..cf79dc7d403f 100644 > --- a/drivers/thermal/spacemit/k1_tsensor.c > +++ b/drivers/thermal/spacemit/k1_tsensor.c > @@ -199,6 +199,29 @@ static irqreturn_t k1_tsensor_irq_thread(int irq, vo= id *data) > return IRQ_HANDLED; > } > =20 > +static void k1_tsensor_shutdown(struct k1_tsensor *ts) > +{ > + u32 val; > + > + /* Disable all interrupts */ > + writel(0xffffffff, ts->base + K1_TSENSOR_INT_EN_REG); > + > + /* Disable all sensor */ > + val =3D readl(ts->base + K1_TSENSOR_EN_REG); > + val &=3D ~K1_TSENSOR_EN_ALL; > + writel(val, ts->base + K1_TSENSOR_EN_REG); > + > + /* Power down the sensor module */ > + val =3D readl(ts->base + K1_TSENSOR_PCTRL_REG); > + val &=3D ~K1_TSENSOR_PCTRL_ENABLE; > + writel(val, ts->base + K1_TSENSOR_PCTRL_REG); > +} > + > +static void devm_k1_tsensor_shutdown(void *data) > +{ > + k1_tsensor_shutdown(data); > +} > + > static int k1_tsensor_probe(struct platform_device *pdev) > { > struct device *dev =3D &pdev->dev; > @@ -229,6 +252,10 @@ static int k1_tsensor_probe(struct platform_device *= pdev) > =20 > k1_tsensor_init(ts); > =20 > + ret =3D devm_add_action_or_reset(dev, devm_k1_tsensor_shutdown, ts); > + if (ret) > + return ret; > + > irq =3D platform_get_irq(pdev, 0); > if (irq < 0) > return irq; Sorry, I missed the hardware cleanup in the original driver. Thanks for fixing it. I also found that registering the shutdown action immediately after k1_tsensor_init() would cause the thermal zones to be released before the IRQ during devres cleanup. The IRQ thread may then access an unregistered thermal zone. I changed the order so that the thermal zones are registered first, followed by the IRQ and the shutdown action. On removal, the hardware interrupt is disabled first, then the IRQ is released, and finally the thermal zones are released. -> % git --no-pager diff drivers/thermal/spacemit/k1_tsensor.c diff --git a/drivers/thermal/spacemit/k1_tsensor.c b/drivers/thermal/spacem= it/k1_tsensor.c index 79222d233129..57dbc652a405 100644 --- a/drivers/thermal/spacemit/k1_tsensor.c +++ b/drivers/thermal/spacemit/k1_tsensor.c @@ -199,6 +199,32 @@ static irqreturn_t k1_tsensor_irq_thread(int irq, void= *data) return IRQ_HANDLED; } +static void k1_tsensor_shutdown(struct k1_tsensor *ts) +{ + u32 val; + + /* Disable all interrupts */ + writel(0xffffffff, ts->base + K1_TSENSOR_INT_EN_REG); + + /* Disable all sensors */ + val =3D readl(ts->base + K1_TSENSOR_EN_REG); + val &=3D ~K1_TSENSOR_EN_ALL; + writel(val, ts->base + K1_TSENSOR_EN_REG); + + /* Clear the sampling configuration set by k1_tsensor_init(). */ + val =3D readl(ts->base + K1_TSENSOR_TIME_REG); + val &=3D ~(K1_TSENSOR_TIME_FILTER_PERIOD | + K1_TSENSOR_TIME_ADC_CNT_RST | + K1_TSENSOR_TIME_WAIT_REF_CNT); + writel(val, ts->base + K1_TSENSOR_TIME_REG); + + /* Clear the control bits configured by k1_tsensor_init(). */ + val =3D readl(ts->base + K1_TSENSOR_PCTRL_REG); + val &=3D ~(K1_TSENSOR_PCTRL_RAW_SEL | + K1_TSENSOR_PCTRL_TEMP_MODE | + K1_TSENSOR_PCTRL_HW_AUTO_MODE | + K1_TSENSOR_PCTRL_ENABLE); + writel(val, ts->base + K1_TSENSOR_PCTRL_REG); +} + +static void devm_k1_tsensor_shutdown(void *data) +{ + k1_tsensor_shutdown(data); +} + static int k1_tsensor_probe(struct platform_device *pdev) { struct device *dev =3D &pdev->dev; @@ -229,34 +255,48 @@ static int k1_tsensor_probe(struct platform_device *p= dev) k1_tsensor_init(ts); - irq =3D platform_get_irq(pdev, 0); - if (irq < 0) - return irq; - - ret =3D devm_request_threaded_irq(dev, irq, NULL, - k1_tsensor_irq_thread, - IRQF_ONESHOT, "k1_tsensor", ts); - if (ret < 0) - return ret; - for (i =3D 0; i < MAX_SENSOR_NUMBER; ++i) { ts->ch[i].id =3D i; ts->ch[i].ts =3D ts; ts->ch[i].tzd =3D devm_thermal_of_zone_register(dev, i, ts->ch + i, &k1_= tsensor_ops); - if (IS_ERR(ts->ch[i].tzd)) - return PTR_ERR(ts->ch[i].tzd); + if (IS_ERR(ts->ch[i].tzd)) { + ret =3D PTR_ERR(ts->ch[i].tzd); + goto err_shutdown; + } /* Attach sysfs hwmon attributes for userspace monitoring */ ret =3D devm_thermal_add_hwmon_sysfs(dev, ts->ch[i].tzd); if (ret) dev_warn(dev, "Failed to add hwmon sysfs attributes\n"); + } - k1_tsensor_enable_irq(ts->ch + i); + ret =3D platform_get_irq(pdev, 0); + if (ret < 0) { + goto err_shutdown; } + ret =3D devm_request_threaded_irq(dev, irq, NULL, + k1_tsensor_irq_thread, + IRQF_ONESHOT, "k1_tsensor", ts); + if (ret < 0) + goto err_shutdown; + + ret =3D devm_add_action_or_reset(dev, devm_k1_tsensor_shutdown, ts); + if (ret) + return ret; + + /* Enable interrupts only after all zones and the handler are ready. */ + for (i =3D 0; i < MAX_SENSOR_NUMBER; ++i) + k1_tsensor_enable_irq(ts->ch + i); + platform_set_drvdata(pdev, ts); return 0; + +err_shutdown: + k1_tsensor_shutdown(ts); + return ret; } static const struct of_device_id k1_tsensor_dt_ids[] =3D { --=20 Best regards, Shuwei Wu