Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 3 Feb 2020 10:42:13 -0800
From:   Bjorn Andersson <bjorn.andersson@linaro.org>
To:     Amit Kucheria <amit.kucheria@linaro.org>
Cc:     linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        swboyd@chromium.org, sivaa@codeaurora.org,
        Andy Gross <agross@kernel.org>,
        Amit Kucheria <amit.kucheria@verdurent.com>,
        linux-pm@vger.kernel.org
Subject: Re: [PATCH v4 5/7] drivers: thermal: tsens: Add watchdog support
Message-ID: <20200203184213.GG3948@builder>
References: <cover.1580390127.git.amit.kucheria@linaro.org>
 <a1f7d34b7281c4e40307f67fce9a5c435ee5e7eb.1580390127.git.amit.kucheria@linaro.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <a1f7d34b7281c4e40307f67fce9a5c435ee5e7eb.1580390127.git.amit.kucheria@linaro.org>
User-Agent: Mutt/1.12.2 (2019-09-21)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu 30 Jan 05:27 PST 2020, Amit Kucheria wrote:

> TSENS IP v2.3 onwards adds support for a watchdog to detect if the TSENS
> HW FSM is stuck. Add support to detect and restart the FSM in the
> driver. The watchdog is configured by the bootloader, we just enable the
> watchdog bark as a debug feature in the kernel.
> 
> Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
> ---
>  drivers/thermal/qcom/tsens-common.c | 43 +++++++++++++++++++++++++++++
>  drivers/thermal/qcom/tsens-v2.c     | 10 +++++++
>  drivers/thermal/qcom/tsens.h        | 14 ++++++++++
>  3 files changed, 67 insertions(+)
> 
> diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c
> index 9d1594d2f1ed..ee2414f33606 100644
> --- a/drivers/thermal/qcom/tsens-common.c
> +++ b/drivers/thermal/qcom/tsens-common.c
> @@ -377,6 +377,26 @@ irqreturn_t tsens_critical_irq_thread(int irq, void *data)
>  	struct tsens_irq_data d;
>  	unsigned long flags;
>  	int temp, ret, i;
> +	u32 wdog_status, wdog_count;
> +
> +	if (priv->feat->has_watchdog) {
> +		ret = regmap_field_read(priv->rf[WDOG_BARK_STATUS], &wdog_status);
> +		if (ret)
> +			return ret;
> +
> +		if (wdog_status) {
> +			/* Clear WDOG interrupt */
> +			regmap_field_write(priv->rf[WDOG_BARK_CLEAR], 1);
> +			regmap_field_write(priv->rf[WDOG_BARK_CLEAR], 0);
> +			ret = regmap_field_read(priv->rf[WDOG_BARK_COUNT], &wdog_count);
> +			if (ret)
> +				return ret;
> +			if (wdog_count)
> +				dev_dbg(priv->dev, "%s: watchdog count: %d\n", __func__, wdog_count);
> +
> +			return IRQ_HANDLED;

Patch looks good, but would is make sense to fall through and handle
critical interrupts as well (both in positive and error cases of this
hunk)?


Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Regards,
Bjorn