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Thu, 29 Nov 2018 09:01:48 -0800 (PST) Date: Thu, 29 Nov 2018 09:01:46 -0800 From: Eduardo Valentin To: Wei Ni Cc: Thierry Reding , daniel.lezcano@linaro.org, linux-tegra@vger.kernel.org, rui.zhang@intel.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH] thermal: tegra: add get_trend ops Message-ID: <20181129170145.GG2688@localhost.localdomain> References: <1542705077-29697-1-git-send-email-wni@nvidia.com> <20181120153833.GB28796@ulmo> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 21, 2018 at 02:36:10PM +0800, Wei Ni wrote: > > > On 20/11/2018 11:38 PM, Thierry Reding wrote: > > On Tue, Nov 20, 2018 at 05:11:17PM +0800, Wei Ni wrote: > >> Add support for get_trend ops that allows soctherm > >> sensors to be used with the step-wise governor. > >> > >> Signed-off-by: Wei Ni > >> --- > >> drivers/thermal/tegra/soctherm.c | 34 ++++++++++++++++++++++++++++++++++ > >> 1 file changed, 34 insertions(+) > >> > >> diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c > >> index ed28110a3535..d2951fbe2b7c 100644 > >> --- a/drivers/thermal/tegra/soctherm.c > >> +++ b/drivers/thermal/tegra/soctherm.c > >> @@ -488,9 +488,43 @@ static int tegra_thermctl_set_trip_temp(void *data, int trip, int temp) > >> return 0; > >> } > >> > >> +static int tegra_thermctl_get_trend(void *data, int trip, > >> + enum thermal_trend *trend) > >> +{ > >> + struct tegra_thermctl_zone *zone = data; > >> + struct thermal_zone_device *tz = zone->tz; > >> + int trip_temp, temp, last_temp, ret; > >> + > >> + if (!tz) > >> + return -EINVAL; > >> + > >> + ret = tz->ops->get_trip_temp(zone->tz, trip, &trip_temp); > >> + if (ret) > >> + return ret; > >> + > >> + mutex_lock(&tz->lock); > >> + temp = tz->temperature; > >> + last_temp = tz->last_temperature; > >> + mutex_unlock(&tz->lock); > >> + > >> + if (temp > trip_temp) { > >> + if (temp >= last_temp) > >> + *trend = THERMAL_TREND_RAISING; > >> + else > >> + *trend = THERMAL_TREND_STABLE; > >> + } else if (temp < trip_temp) { > >> + *trend = THERMAL_TREND_DROPPING; > >> + } else { > >> + *trend = THERMAL_TREND_STABLE; > >> + } > >> + > >> + return 0; > >> +} > > > > This looks like a reimplementation of the get_tz_trend() helper. Is > > seems like that helper already has everything we need. Perhaps this > > isn't working because of-thermal installs of_thermal_get_trend(), a > > function that returns -EINVAL if the driver doesn't implement the > > ->get_trend() callback. > > 1. The get_tz_trend() helper can work, because it has: > if (tz->emul_temperature || !tz->ops->get_trend || > tz->ops->get_trend(tz, trip, &trend)) { > ... > } > the tz->ops->get_trend is of_thermal_get_trend(). If without special > get_trend(), it will return -EINVAL, so it will implement the if block > to get the "trend". If we have the special get_trend(), then the > of_thermal_get_trend() will return 0, so this helper will not implement > the if block, it will get the "trend" from the special get_trend(). The idea of the helper is to provide a trend in case drivers dont have a specific way of doing so. > > 2. There has a little difference between the helper and our special > callback. The tegra_thermctl_get_trend() consider the trip_temp, but the > get_tz_trend() helper didn't. > Yeah, if you are computing trend towards a trip, then yes, that is different and this patch is needed. > > > > Perhaps a better way would be to do something like this in > > thermal_zone_of_add_sensor(): > > > > if (ops->get_trend) > > tzd->ops->get_trend = of_thermal_get_trend; > > > > That's similar to how ->set_trips() and ->set_emul_temp() are set up > > and should make sure that get_tz_trend() will do the right thing for > > all drivers that don't implement a special ->get_trend(). > > As above description, I think the of_thermal_get_trend() already can > handle this case, doesn't need to change. > > Wei. > > > > > Thierry > >