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Date:   Wed, 8 Jul 2020 12:03:01 +0100
From:   Russell King - ARM Linux admin <linux@armlinux.org.uk>
To:     Ondrej Jirman <megous@megous.com>
Cc:     linux-sunxi@googlegroups.com,
        Amit Kucheria <amit.kucheria@verdurent.com>,
        "open list:ALLWINNER THERMAL DRIVER" <linux-pm@vger.kernel.org>,
        Yangtao Li <tiny.windzz@gmail.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        open list <linux-kernel@vger.kernel.org>,
        Maxime Ripard <mripard@kernel.org>,
        Vasily Khoruzhick <anarsoul@gmail.com>,
        Chen-Yu Tsai <wens@csie.org>, Zhang Rui <rui.zhang@intel.com>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] thermal: sun8i: Be loud when probe fails
Message-ID: <20200708110301.GB1551@shell.armlinux.org.uk>
References: <20200708105527.868987-1-megous@megous.com>
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On Wed, Jul 08, 2020 at 12:55:27PM +0200, Ondrej Jirman wrote:
> I noticed several mobile Linux distributions failing to enable the
> thermal regulation correctly, because the kernel is silent
> when thermal driver fails to probe. Add enough error reporting
> to debug issues and warn users in case thermal sensor is failing
> to probe.
> 
> Failing to notify users means, that SoC can easily overheat under
> load.
> 
> Signed-off-by: Ondrej Jirman <megous@megous.com>
> ---
>  drivers/thermal/sun8i_thermal.c | 55 ++++++++++++++++++++++++++-------
>  1 file changed, 43 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
> index 74d73be16496..9065e79ae743 100644
> --- a/drivers/thermal/sun8i_thermal.c
> +++ b/drivers/thermal/sun8i_thermal.c
> @@ -287,8 +287,12 @@ static int sun8i_ths_calibrate(struct ths_device *tmdev)
>  
>  	calcell = devm_nvmem_cell_get(dev, "calibration");
>  	if (IS_ERR(calcell)) {
> +		dev_err(dev, "Failed to get calibration nvmem cell (%ld)\n",
> +			PTR_ERR(calcell));

Consider using:

		dev_err(dev, "Failed to get calibration nvmem cell (%pe)\n",
			calcell);

which means the kernel can print the symbolic errno value.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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