linux-kernel - Re: [PATCH v3] thermal: imx8mm_thermal: validate temperature range

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Date:   Mon, 17 Oct 2022 16:06:17 +0800
From:   Peng Fan <peng.fan@....nxp.com>
To:     Marcus Folkesson <marcus.folkesson@...il.com>,
        "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>,
        NXP Linux Team <linux-imx@....com>,
        Anson Huang <Anson.Huang@....com>
Cc:     linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] thermal: imx8mm_thermal: validate temperature range



On 10/14/2022 3:35 PM, Marcus Folkesson wrote:
> Check against the upper temperature limit (125 degrees C) before
> consider the temperature valid.
> 
> Fixes: 5eed800a6811 ("thermal: imx8mm: Add support for i.MX8MM thermal monitoring unit")
> Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
> ---
> 
> Notes:
>      v2: Also invalidate if temperature > max (125 degrees C)
>      v3: Only check temperature range as the valid bit is invalid.
> 
>   drivers/thermal/imx8mm_thermal.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/imx8mm_thermal.c b/drivers/thermal/imx8mm_thermal.c
> index af666bd9e8d4..c5cd873c6e01 100644
> --- a/drivers/thermal/imx8mm_thermal.c
> +++ b/drivers/thermal/imx8mm_thermal.c
> @@ -65,8 +65,14 @@ static int imx8mm_tmu_get_temp(void *data, int *temp)
>   	u32 val;
>   
>   	val = readl_relaxed(tmu->base + TRITSR) & TRITSR_TEMP0_VAL_MASK;
> +
> +	/*
> +	 * Do not validate against the V bit (bit 31) due to errata
> +	 * ERR051272: TMU: Bit 31 of registers TMU_TSCR/TMU_TRITSR/TMU_TRATSR invalid
> +	 */
> +
>   	*temp = val * 1000;
> -	if (*temp < VER1_TEMP_LOW_LIMIT)
> +	if (*temp < VER1_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_LIMIT)
>   		return -EAGAIN;
>   
>   	return 0;

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