linux-kernel - RE: [PATCH 2/3] thermal: qoriq_thermal: only enable supported sensors

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <DU0PR04MB9417D9020578083527FC16C888489@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date:   Wed, 31 May 2023 13:00:26 +0000
From:   Peng Fan <peng.fan@....com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     "amitk@...nel.org" <amitk@...nel.org>,
        "rui.zhang@...el.com" <rui.zhang@...el.com>,
        "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Alice Guo <alice.guo@....com>
Subject: RE: [PATCH 2/3] thermal: qoriq_thermal: only enable supported sensors

> Subject: Re: [PATCH 2/3] thermal: qoriq_thermal: only enable supported
> sensors
> 
> On 31/05/2023 14:05, Peng Fan wrote:
> >> Subject: Re: [PATCH 2/3] thermal: qoriq_thermal: only enable
> >> supported sensors
> >>
> >> On 16/05/2023 10:37, Peng Fan (OSS) wrote:
> >>> From: Peng Fan <peng.fan@....com>
> >>>
> >>> There are MAX 16 sensors, but not all of them supported. Such as
> >>> i.MX8MQ, there are only 3 sensors. Enabling all 16 sensors will
> >>> touch reserved bits from i.MX8MQ reference mannual, and TMU will
> >>> stuck, temperature will not update anymore.
> >>>
> >>> Fixes: 45038e03d633 ("thermal: qoriq: Enable all sensors before
> >>> registering them")
> >>> Signed-off-by: Peng Fan <peng.fan@....com>
> >>> ---
> >>>    drivers/thermal/qoriq_thermal.c | 30 +++++++++++++++++++-----------
> >>>    1 file changed, 19 insertions(+), 11 deletions(-)
> >>>
> >>> diff --git a/drivers/thermal/qoriq_thermal.c
> >>> b/drivers/thermal/qoriq_thermal.c index b806a0929459..53748c4a5be1
> >>> 100644
> >>> --- a/drivers/thermal/qoriq_thermal.c
> >>> +++ b/drivers/thermal/qoriq_thermal.c
> >>> @@ -31,7 +31,6 @@
> >>>    #define TMR_DISABLE	0x0
> >>>    #define TMR_ME		0x80000000
> >>>    #define TMR_ALPF	0x0c000000
> >>> -#define TMR_MSITE_ALL	GENMASK(15, 0)
> >>>
> >>>    #define REGS_TMTMIR	0x008	/* Temperature measurement
> >> interval Register */
> >>>    #define TMTMIR_DEFAULT	0x0000000f
> >>> @@ -105,6 +104,11 @@ static int tmu_get_temp(struct
> >> thermal_zone_device *tz, int *temp)
> >>>    	 * within sensor range. TEMP is an 9 bit value representing
> >>>    	 * temperature in KelVin.
> >>>    	 */
> >>> +
> >>> +	regmap_read(qdata->regmap, REGS_TMR, &val);
> >>> +	if (!(val & TMR_ME))
> >>> +		return -EAGAIN;
> >>
> >> How is this change related to what is described in the changelog?
> >
> > devm_thermal_zone_of_sensor_register will invoke get temp, since we
> > reverted the 45038e03d633 did, we need to check TMR_ME to avoid
> return
> > invalid temperature.
> 
> 
>  From a higher perspective if the sensor won't be enabled, then the thermal
> zone should not be registered, the get_temp won't happen on a disabled
> sensor and this test won't be necessary, no ?

Agree, let me move the temp sensor enabling before register thermal zone.

Thanks,
Peng.

> 
> --
> <https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fww
> w.linaro.org%2F&data=05%7C01%7Cpeng.fan%40nxp.com%7C2a5070b5049
> 14957160008db61d37861%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7
> C0%7C638211333111330055%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4
> wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%
> 7C%7C%7C&sdata=aJBF2UEqaCAqcAbHcKzbGReVv6pbYlyQ25riVxEdG08%3D
> &reserved=0> Linaro.org │ Open source software for ARM SoCs
> 
> Follow Linaro:
> <https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fww
> w.facebook.com%2Fpages%2FLinaro&data=05%7C01%7Cpeng.fan%40nxp.c
> om%7C2a5070b504914957160008db61d37861%7C686ea1d3bc2b4c6fa92cd
> 99c5c301635%7C0%7C0%7C638211333111330055%7CUnknown%7CTWFpb
> GZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI
> 6Mn0%3D%7C3000%7C%7C%7C&sdata=9l627puhL7hQgMlPWaKkCIDkQKGX
> TH49rEM0NFipvDs%3D&reserved=0> Facebook |
> <https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Ftwitt
> er.com%2F%23!%2Flinaroorg&data=05%7C01%7Cpeng.fan%40nxp.com%7C
> 2a5070b504914957160008db61d37861%7C686ea1d3bc2b4c6fa92cd99c5c30
> 1635%7C0%7C0%7C638211333111330055%7CUnknown%7CTWFpbGZsb3d8
> eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3
> D%7C3000%7C%7C%7C&sdata=%2B0Oa%2BrxHmGPga0%2BGQjOOX6Dxaiuj
> oPJhzwqBjjO%2B2Qo%3D&reserved=0> Twitter |
> <https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fww
> w.linaro.org%2Flinaro-
> blog%2F&data=05%7C01%7Cpeng.fan%40nxp.com%7C2a5070b5049149571
> 60008db61d37861%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C
> 638211333111330055%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw
> MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C
> %7C&sdata=2lfwzPj3p%2BjowtVDc03plo1Ds%2BnT%2B2eSwdTQ9yQosfo%3
> D&reserved=0> Blog