linux-kernel - RE: [PATCH] thermal: imx8mm: suppress log message on probe deferral

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Message-ID: <DU0PR04MB9417FF2B84CC1B43665FD2698833A@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date:   Sun, 9 Jul 2023 22:19:14 +0000
From:   Peng Fan <peng.fan@....com>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>, Marek Vasut <marex@...x.de>
CC:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] thermal: imx8mm: suppress log message on probe deferral


> Subject: [PATCH] thermal: imx8mm: suppress log message on probe deferral
> 
> nvmem_cell_read_u32() may return -EPROBE_DEFER if NVMEM supplier has
> not yet been probed. Future reprobe may succeed, so printing:
> 
>   i.mx8mm_thermal 30260000.tmu: Failed to read OCOTP nvmem cell (-517).
> 
> to the log is confusing. Fix this by using dev_err_probe. This also elevates
> the message from warning to error, which is more correct: The log message
> is only ever printed in probe error path and probe aborts afterwards, so it
> really warrants an error-level message.
> 
> Fixes: 403291648823 ("thermal/drivers/imx: Add support for loading
> calibration data from OCOTP")
> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
[Peng Fan] 

Reviewed-by: Peng Fan <peng.fan@....com>

> ---
>  drivers/thermal/imx8mm_thermal.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/thermal/imx8mm_thermal.c
> b/drivers/thermal/imx8mm_thermal.c
> index d8005e9ec992..1f780c4a1c89 100644
> --- a/drivers/thermal/imx8mm_thermal.c
> +++ b/drivers/thermal/imx8mm_thermal.c
> @@ -179,10 +179,8 @@ static int imx8mm_tmu_probe_set_calib_v1(struct
> platform_device *pdev,
>  	int ret;
> 
>  	ret = nvmem_cell_read_u32(&pdev->dev, "calib", &ana0);
> -	if (ret) {
> -		dev_warn(dev, "Failed to read OCOTP nvmem cell (%d).\n",
> ret);
> -		return ret;
> -	}
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to read OCOTP
> nvmem cell\n");
> 
>  	writel(FIELD_PREP(TASR_BUF_VREF_MASK,
>  			  FIELD_GET(ANA0_BUF_VREF_MASK, ana0)) |
> --
> 2.39.2