linux-kernel - Re: [PATCH v5 0/3] Thermal ACPI APIs for generic trip points

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Message-ID: <c7abcce47df0aaa55f1e6c65f501bc691d35eae8.camel@linux.intel.com>
Date:   Wed, 18 Jan 2023 11:16:41 -0800
From:   srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     "Zhang, Rui" <rui.zhang@...el.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>
Cc:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "christophe.jaillet@...adoo.fr" <christophe.jaillet@...adoo.fr>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v5 0/3] Thermal ACPI APIs for generic trip points

On Wed, 2023-01-18 at 11:01 -0800, srinivas pandruvada wrote:
> On Wed, 2023-01-18 at 13:48 +0000, Zhang, Rui wrote:
> > On Wed, 2023-01-18 at 10:53 +0100, Daniel Lezcano wrote:
> > > Hi,
> > > 
> > > On 13/01/2023 19:02, Daniel Lezcano wrote:
> > > > Recently sent as a RFC, the thermal ACPI for generic trip
> > > > points
> > > > is
> > > > a set of
> > > > functions to fill the generic trip points structure which will
> > > > become the
> > > > standard structure for the thermal framework and its users.
> > > > 
> > > > Different Intel drivers and the ACPI thermal driver are using
> > > > the
> > > > ACPI tables to
> > > > get the thermal zone information. As those are getting the same
> > > > information,
> > > > providing this set of ACPI function with the generic trip
> > > > points
> > > > will
> > > > consolidate the code.
> > > > 
> > > > Also, the Intel PCH and the Intel 34xx drivers are converted to
> > > > use
> > > > the generic
> > > > trip points relying on the ACPI generic trip point parsing
> > > > functions.
> > > > 
> > > > These changes have been tested on a Thinkpad Lenovo x280 with
> > > > the
> > > > PCH and
> > > > INT34xx drivers. No regression have been observed, the trip
> > > > points
> > > > remain the
> > > > same for what is described on this system.
> > > 
> > > Are we ok with this series ?
> > > 
> > > Sorry for insisting but I would like to go forward with the
> > > generic
> > > thermal trip work. There are more patches pending depending on
> > > this
> > > series.
> > 
> > The whole series looks good to me.
> > 
> > Reviwed-by: Zhang Rui <rui.zhang@...el.com>
> > 
> > But we'd better wait for the thermald test result from Srinvias.
> 
> A quick test show that things still work with thermald and these
> changes.

But I have a question. In some devices trip point temperature is not
static. When hardware changes, we get notification. For example
INT3403_PERF_TRIP_POINT_CHANGED for INT3403 drivers.
Currently get_trip can get the latest changed value. But if we
preregister, we need some mechanism to update them.

Thanks,
Srinivas



> Thanks,
> Srinivas
> 
> > 
> > thanks,
> > rui
> > > 
> > > Thanks
> > >    -- Daniel
> > > 
> > > > Changelog:
> > > >   - V5:
> > > >     - Fixed GTSH unit conversion, deciK -> milli C
> > > > 
> > > >   - V4:
> > > >     - Fixed Kconfig option dependency, select THERMAL_ACPI if
> > > > ACPI
> > > > is set
> > > >       only for the PCH driver
> > > > 
> > > >   - V3:
> > > >     - Took into account Rafael's comments
> > > >     - Used a silence option THERMAL_ACPI in order to stay
> > > > consistent
> > > >       with THERMAL_OF. It is up to the API user to select the
> > > > option.
> > > > 
> > > >   - V2:
> > > >     - Fix the thermal ACPI patch where the thermal_acpi.c was
> > > > not
> > > > included in
> > > >       the series
> > > >     - Provide a couple of users of this API which could have
> > > > been
> > > > tested on a
> > > >       real system
> > > > 
> > > > Daniel Lezcano (3):
> > > >    thermal/acpi: Add ACPI trip point routines
> > > >    thermal/drivers/intel: Use generic trip points for intel_pch
> > > >    thermal/drivers/intel: Use generic trip points int340x
> > > > 
> > > >   drivers/thermal/Kconfig                       |   4 +
> > > >   drivers/thermal/Makefile                      |   1 +
> > > >   drivers/thermal/intel/Kconfig                 |   1 +
> > > >   drivers/thermal/intel/int340x_thermal/Kconfig |   1 +
> > > >   .../int340x_thermal/int340x_thermal_zone.c    | 177 ++++-----
> > > > --
> > > > --
> > > > --
> > > >   .../int340x_thermal/int340x_thermal_zone.h    |  10 +-
> > > >   drivers/thermal/intel/intel_pch_thermal.c     |  88 ++------
> > > >   drivers/thermal/thermal_acpi.c                | 210
> > > > ++++++++++++++++++
> > > >   include/linux/thermal.h                       |   8 +
> > > >   9 files changed, 286 insertions(+), 214 deletions(-)
> > > >   create mode 100644 drivers/thermal/thermal_acpi.c
> > > > 
>