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Date: Wed, 21 Nov 2018 05:28:26 +0000
From: Anson Huang <anson.huang@....com>
To: Viresh Kumar <viresh.kumar@...aro.org>
CC: "rui.zhang@...el.com" <rui.zhang@...el.com>,
"edubezval@...il.com" <edubezval@...il.com>,
"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"l.stach@...gutronix.de" <l.stach@...gutronix.de>,
dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V4] thermal: imx: fix for dependency on cpu-freq
Best Regards!
Anson Huang
> -----Original Message-----
> From: Viresh Kumar [mailto:viresh.kumar@...aro.org]
> Sent: 2018年11月21日 13:21
> To: Anson Huang <anson.huang@....com>
> Cc: rui.zhang@...el.com; edubezval@...il.com; daniel.lezcano@...aro.org;
> linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org;
> l.stach@...gutronix.de; dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH V4] thermal: imx: fix for dependency on cpu-freq
>
> On 21-11-18, 05:08, Anson Huang wrote:
> > The thermal driver is a standalone driver for monitoring SoC
> > temperature by enabling thermal sensor, so it can be enabled even when
> > CONFIG_CPU_FREQ is NOT set. So remove the dependency with
> CPU_THERMAL.
> >
> > Introduce dummy function of legacy cooling register/unregister to make
> > thermal driver probe successfully when CONFIG_CPU_FREQ is NOT set.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > ---
> > changes since V3:
> > rename the label of "cpufreq_put" with "legacy_cleanup".
> > drivers/thermal/Kconfig | 2 +-
> > drivers/thermal/imx_thermal.c | 44
> > +++++++++++++++++++++++++++++++------------
> > 2 files changed, 33 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index
> > 5422523..93bd3bb 100644
> > --- a/drivers/thermal/Kconfig
> > +++ b/drivers/thermal/Kconfig
> > @@ -212,7 +212,7 @@ config HISI_THERMAL
> >
> > config IMX_THERMAL
> > tristate "Temperature sensor driver for Freescale i.MX SoCs"
> > - depends on (ARCH_MXC && CPU_THERMAL) || COMPILE_TEST
> > + depends on ARCH_MXC || COMPILE_TEST
> > depends on NVMEM || !NVMEM
> > depends on MFD_SYSCON
> > depends on OF
> > diff --git a/drivers/thermal/imx_thermal.c
> > b/drivers/thermal/imx_thermal.c index 1566154..328ee05 100644
> > --- a/drivers/thermal/imx_thermal.c
> > +++ b/drivers/thermal/imx_thermal.c
> > @@ -648,15 +648,24 @@ static const struct of_device_id
> > of_imx_thermal_match[] = { }; MODULE_DEVICE_TABLE(of,
> > of_imx_thermal_match);
> >
> > +#ifdef CONFIG_CPU_FREQ
> > /*
> > * Create cooling device in case no #cooling-cells property is available in
> > * CPU node
> > */
> > static int imx_thermal_register_legacy_cooling(struct
> > imx_thermal_data *data) {
> > - struct device_node *np = of_get_cpu_node(data->policy->cpu, NULL);
> > + struct device_node *np;
> > int ret;
> >
> > + data->policy = cpufreq_cpu_get(0);
> > + if (!data->policy) {
> > + pr_debug("%s: CPUFreq policy not found\n", __func__);
> > + return -EPROBE_DEFER;
> > + }
> > +
> > + np = of_get_cpu_node(data->policy->cpu, NULL);
> > +
> > if (!np || !of_find_property(np, "#cooling-cells", NULL)) {
> > data->cdev = cpufreq_cooling_register(data->policy);
> > if (IS_ERR(data->cdev)) {
> > @@ -669,6 +678,22 @@ static int
> imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
> > return 0;
> > }
> >
> > +static void imx_thermal_unregister_legacy_cooling(struct
> > +imx_thermal_data *data) {
> > + cpufreq_cooling_unregister(data->cdev);
> > + cpufreq_cpu_put(data->policy);
> > +}
> > +#else
> > +static inline int imx_thermal_register_legacy_cooling(struct
> > +imx_thermal_data *data) {
> > + return 0;
> > +}
> > +
> > +static inline void imx_thermal_unregister_legacy_cooling(struct
> > +imx_thermal_data *data) { } #endif
> > +
> > static int imx_thermal_probe(struct platform_device *pdev) {
> > struct imx_thermal_data *data;
> > @@ -743,13 +768,9 @@ static int imx_thermal_probe(struct
> platform_device *pdev)
> > regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
> > data->socdata->power_down_mask);
> >
> > - data->policy = cpufreq_cpu_get(0);
> > - if (!data->policy) {
> > - pr_debug("%s: CPUFreq policy not found\n", __func__);
> > - return -EPROBE_DEFER;
> > - }
> > -
> > ret = imx_thermal_register_legacy_cooling(data);
> > + if (ret == -EPROBE_DEFER)
> > + return ret;
> > if (ret) {
>
> Sorry for not noticing earlier, but wouldn't it be better to move the
> EPROBE_DEFER check inside of this if block ? Otherwise we will have two
> conditional blocks in the success (normal) case.
Since there is similar case of DEFER PROBE for the case of imx_init_from_nvmem_cells
check, should I create another patch of same fix for it in V5 patch set?
Anson.
>
> Something like this:
>
> if (ret) {
> if (ret == -EPROBE_DEFER)
> return ret;
>
> dev_err(..);
> ...
> }
>
> > dev_err(&pdev->dev,
> > "failed to register cpufreq cooling device: %d\n", ret); @@
> -762,7
> > +783,7 @@ static int imx_thermal_probe(struct platform_device *pdev)
> > if (ret != -EPROBE_DEFER)
> > dev_err(&pdev->dev,
> > "failed to get thermal clk: %d\n", ret);
> > - goto cpufreq_put;
> > + goto legacy_cleanup;
> > }
> >
> > /*
> > @@ -775,7 +796,7 @@ static int imx_thermal_probe(struct platform_device
> *pdev)
> > ret = clk_prepare_enable(data->thermal_clk);
> > if (ret) {
> > dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
> > - goto cpufreq_put;
> > + goto legacy_cleanup;
> > }
> >
> > data->tz = thermal_zone_device_register("imx_thermal_zone",
> > @@ -829,9 +850,8 @@ static int imx_thermal_probe(struct platform_device
> *pdev)
> > thermal_zone_device_unregister(data->tz);
> > clk_disable:
> > clk_disable_unprepare(data->thermal_clk);
> > -cpufreq_put:
> > - cpufreq_cooling_unregister(data->cdev);
> > - cpufreq_cpu_put(data->policy);
> > +legacy_cleanup:
> > + imx_thermal_unregister_legacy_cooling(data);
> >
> > return ret;
> > }
> > --
> > 2.7.4
>
> --
> viresh
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