linux-kernel - Re: [PATCH v2] thermal: imx8mm_thermal: wait for a valid measurement

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Message-ID: <Y0kPpAYYnSvV/HWR@gmail.com>
Date:   Fri, 14 Oct 2022 09:28:36 +0200
From:   Marcus Folkesson <marcus.folkesson@...il.com>
To:     Peng Fan <peng.fan@....nxp.com>
Cc:     "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>, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] thermal: imx8mm_thermal: wait for a valid measurement

Hi Peng,

On Fri, Oct 14, 2022 at 09:20:21AM +0800, Peng Fan wrote:
> 
> 
> On 10/7/2022 3:30 PM, Marcus Folkesson wrote:
> > Check if first measurement is still pending or if temperature is out of
> > range.
> > Return and try again later if that is the case.
> > 
> > Fixes: 5eed800a6811 ("thermal: imx8mm: Add support for i.MX8MM thermal monitoring unit")
> > Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
> 
> NAK:
> Please refer: https://www.nxp.com/docs/en/errata/IMX8MM_0N87W.pdf
> ERR051272: TMU: Bit 31 of registers TMU_TSCR/TMU_TRITSR/TMU_TRATSR invalid

I see, thank you.

I think it is still worth to check the upper limit though, so I will
send a patch for that.

> 
> Thanks,
> Peng.

Best regards,
Marcus Folkesson

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