* [PATCH] cpufreq: imx6q: add CPU as cooling device
@ 2017-11-14 13:51 Bastian Stender
2017-11-15 4:59 ` Viresh Kumar
0 siblings, 1 reply; 5+ messages in thread
From: Bastian Stender @ 2017-11-14 13:51 UTC (permalink / raw)
To: Rafael J . Wysocki, Viresh Kumar
Cc: linux-pm, Zhang Rui, Eduardo Valentin, kernel, Bastian Stender
The cooling device should be part of the i.MX cpufreq driver. So move
it there.
Use of_cpufreq_power_cooling_register to link the cooling device to the
device tree node provided.
This makes it possible to bind the cpufreq cooling device to a custom
thermal zone via a cooling-maps entry like:
cooling-maps {
map0 {
trip = <&board_alert>;
cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
};
};
Assuming a cpu node exists with label "cpu0" and #cooling-cells
property.
Signed-off-by: Bastian Stender <bst@pengutronix.de>
---
This is part of a rework of "thermal: imx: use cpufreq cooling of
registration method" (id:20171103164203.5805-1-bst@pengutronix.de).
The cooling device gets removed from imx_thermal code by "thermal: imx:
remove cooling device" (id:20171114134829.1354-1-bst@pengutronix.de)
---
drivers/cpufreq/imx6q-cpufreq.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index 14466a9b01c0..66833840236e 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -9,6 +9,7 @@
#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
+#include <linux/cpu_cooling.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
@@ -35,6 +36,7 @@ static struct clk *pll2_bus_clk;
static struct clk *secondary_sel_clk;
static struct device *cpu_dev;
+static struct thermal_cooling_device *cdev;
static bool free_opp;
static struct cpufreq_frequency_table *freq_table;
static unsigned int transition_latency;
@@ -169,6 +171,32 @@ static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
return 0;
}
+static void imx6q_cpufreq_ready(struct cpufreq_policy *policy)
+{
+ struct device_node *np = of_node_get(cpu_dev->of_node);
+ u32 capacitance = 0;
+
+ if (WARN_ON(!np))
+ return;
+
+ if (of_find_property(np, "#cooling-cells", NULL)) {
+ of_property_read_u32(np, "dynamic-power-coefficient", &capacitance);
+
+ cdev = of_cpufreq_power_cooling_register(np,
+ policy, capacitance, NULL);
+
+ if (IS_ERR(cdev)) {
+ dev_err(cpu_dev,
+ "running cpufreq without cooling device: %ld\n",
+ PTR_ERR(cdev));
+
+ cdev = NULL;
+ }
+ }
+
+ of_node_put(np);
+}
+
static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
{
int ret;
@@ -180,13 +208,23 @@ static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
return ret;
}
+static int imx6q_cpufreq_exit(struct cpufreq_policy *policy)
+{
+ cpufreq_cooling_unregister(cdev);
+ dev_pm_opp_free_cpufreq_table(cpu_dev, &policy->freq_table);
+
+ return 0;
+}
+
static struct cpufreq_driver imx6q_cpufreq_driver = {
.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
.verify = cpufreq_generic_frequency_table_verify,
.target_index = imx6q_set_target,
.get = cpufreq_generic_get,
.init = imx6q_cpufreq_init,
+ .exit = imx6q_cpufreq_exit,
.name = "imx6q-cpufreq",
+ .ready = imx6q_cpufreq_ready,
.attr = cpufreq_generic_attr,
.suspend = cpufreq_generic_suspend,
};
--
2.11.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] cpufreq: imx6q: add CPU as cooling device
2017-11-14 13:51 [PATCH] cpufreq: imx6q: add CPU as cooling device Bastian Stender
@ 2017-11-15 4:59 ` Viresh Kumar
2017-11-15 9:04 ` Bastian Stender
0 siblings, 1 reply; 5+ messages in thread
From: Viresh Kumar @ 2017-11-15 4:59 UTC (permalink / raw)
To: Bastian Stender, shawnguo
Cc: Rafael J . Wysocki, linux-pm, Zhang Rui, Eduardo Valentin, kernel
+Shawn
On 14-11-17, 14:51, Bastian Stender wrote:
> The cooling device should be part of the i.MX cpufreq driver. So move
> it there.
>
> Use of_cpufreq_power_cooling_register to link the cooling device to the
> device tree node provided.
>
> This makes it possible to bind the cpufreq cooling device to a custom
> thermal zone via a cooling-maps entry like:
>
> cooling-maps {
> map0 {
> trip = <&board_alert>;
> cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> };
> };
>
> Assuming a cpu node exists with label "cpu0" and #cooling-cells
> property.
>
> Signed-off-by: Bastian Stender <bst@pengutronix.de>
> ---
> This is part of a rework of "thermal: imx: use cpufreq cooling of
> registration method" (id:20171103164203.5805-1-bst@pengutronix.de).
>
> The cooling device gets removed from imx_thermal code by "thermal: imx:
> remove cooling device" (id:20171114134829.1354-1-bst@pengutronix.de)
> ---
> drivers/cpufreq/imx6q-cpufreq.c | 38 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 38 insertions(+)
>
> diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
> index 14466a9b01c0..66833840236e 100644
> --- a/drivers/cpufreq/imx6q-cpufreq.c
> +++ b/drivers/cpufreq/imx6q-cpufreq.c
> @@ -9,6 +9,7 @@
> #include <linux/clk.h>
> #include <linux/cpu.h>
> #include <linux/cpufreq.h>
> +#include <linux/cpu_cooling.h>
> #include <linux/err.h>
> #include <linux/module.h>
> #include <linux/of.h>
> @@ -35,6 +36,7 @@ static struct clk *pll2_bus_clk;
> static struct clk *secondary_sel_clk;
>
> static struct device *cpu_dev;
> +static struct thermal_cooling_device *cdev;
> static bool free_opp;
> static struct cpufreq_frequency_table *freq_table;
> static unsigned int transition_latency;
> @@ -169,6 +171,32 @@ static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
> return 0;
> }
>
> +static void imx6q_cpufreq_ready(struct cpufreq_policy *policy)
> +{
> + struct device_node *np = of_node_get(cpu_dev->of_node);
> + u32 capacitance = 0;
> +
> + if (WARN_ON(!np))
> + return;
> +
> + if (of_find_property(np, "#cooling-cells", NULL)) {
> + of_property_read_u32(np, "dynamic-power-coefficient", &capacitance);
> +
> + cdev = of_cpufreq_power_cooling_register(np,
> + policy, capacitance, NULL);
> +
> + if (IS_ERR(cdev)) {
> + dev_err(cpu_dev,
> + "running cpufreq without cooling device: %ld\n",
> + PTR_ERR(cdev));
> +
> + cdev = NULL;
> + }
> + }
> +
> + of_node_put(np);
> +}
> +
> static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
> {
> int ret;
> @@ -180,13 +208,23 @@ static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
> return ret;
> }
>
> +static int imx6q_cpufreq_exit(struct cpufreq_policy *policy)
> +{
> + cpufreq_cooling_unregister(cdev);
> + dev_pm_opp_free_cpufreq_table(cpu_dev, &policy->freq_table);
You incorrectly copied this routine (and so above line) from somewhere else ? :)
--
viresh
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] cpufreq: imx6q: add CPU as cooling device
2017-11-15 4:59 ` Viresh Kumar
@ 2017-11-15 9:04 ` Bastian Stender
2017-11-15 9:06 ` Viresh Kumar
0 siblings, 1 reply; 5+ messages in thread
From: Bastian Stender @ 2017-11-15 9:04 UTC (permalink / raw)
To: Viresh Kumar
Cc: shawnguo, Eduardo Valentin, Zhang Rui, Rafael J . Wysocki,
kernel, linux-pm
On 11/15/2017 05:59 AM, Viresh Kumar wrote:
> On 14-11-17, 14:51, Bastian Stender wrote:
>> The cooling device should be part of the i.MX cpufreq driver. So move
>> it there.
>>
>> Use of_cpufreq_power_cooling_register to link the cooling device to the
>> device tree node provided.
>>
>> This makes it possible to bind the cpufreq cooling device to a custom
>> thermal zone via a cooling-maps entry like:
>>
>> cooling-maps {
>> map0 {
>> trip = <&board_alert>;
>> cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
>> };
>> };
>>
>> Assuming a cpu node exists with label "cpu0" and #cooling-cells
>> property.
>>
>> Signed-off-by: Bastian Stender <bst@pengutronix.de>
>> ---
>> This is part of a rework of "thermal: imx: use cpufreq cooling of
>> registration method" (id:20171103164203.5805-1-bst@pengutronix.de).
>>
>> The cooling device gets removed from imx_thermal code by "thermal: imx:
>> remove cooling device" (id:20171114134829.1354-1-bst@pengutronix.de)
>> ---
>> drivers/cpufreq/imx6q-cpufreq.c | 38 ++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 38 insertions(+)
>>
>> diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
>> index 14466a9b01c0..66833840236e 100644
>> --- a/drivers/cpufreq/imx6q-cpufreq.c
>> +++ b/drivers/cpufreq/imx6q-cpufreq.c
>> @@ -9,6 +9,7 @@
>> #include <linux/clk.h>
>> #include <linux/cpu.h>
>> #include <linux/cpufreq.h>
>> +#include <linux/cpu_cooling.h>
>> #include <linux/err.h>
>> #include <linux/module.h>
>> #include <linux/of.h>
>> @@ -35,6 +36,7 @@ static struct clk *pll2_bus_clk;
>> static struct clk *secondary_sel_clk;
>>
>> static struct device *cpu_dev;
>> +static struct thermal_cooling_device *cdev;
>> static bool free_opp;
>> static struct cpufreq_frequency_table *freq_table;
>> static unsigned int transition_latency;
>> @@ -169,6 +171,32 @@ static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
>> return 0;
>> }
>>
>> +static void imx6q_cpufreq_ready(struct cpufreq_policy *policy)
>> +{
>> + struct device_node *np = of_node_get(cpu_dev->of_node);
>> + u32 capacitance = 0;
>> +
>> + if (WARN_ON(!np))
>> + return;
>> +
>> + if (of_find_property(np, "#cooling-cells", NULL)) {
>> + of_property_read_u32(np, "dynamic-power-coefficient", &capacitance);
>> +
>> + cdev = of_cpufreq_power_cooling_register(np,
>> + policy, capacitance, NULL);
>> +
>> + if (IS_ERR(cdev)) {
>> + dev_err(cpu_dev,
>> + "running cpufreq without cooling device: %ld\n",
>> + PTR_ERR(cdev));
>> +
>> + cdev = NULL;
>> + }
>> + }
>> +
>> + of_node_put(np);
>> +}
>> +
>> static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
>> {
>> int ret;
>> @@ -180,13 +208,23 @@ static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
>> return ret;
>> }
>>
>> +static int imx6q_cpufreq_exit(struct cpufreq_policy *policy)
>> +{
>> + cpufreq_cooling_unregister(cdev);
>> + dev_pm_opp_free_cpufreq_table(cpu_dev, &policy->freq_table);
>
> You incorrectly copied this routine (and so above line) from somewhere else ? :)
Yes, I looked how drivers/cpufreq/mediatek-cpufreq.c handles the cooling
device. So dev_pm_opp_free_cpufreq_table is obviously not needed, but
why do we need no cpufreq_cooling_unregister call here?
Regards,
Bastian
--
Pengutronix e.K.
Industrial Linux Solutions
http://www.pengutronix.de/
Peiner Str. 6-8, 31137 Hildesheim, Germany
Amtsgericht Hildesheim, HRA 2686
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] cpufreq: imx6q: add CPU as cooling device
2017-11-15 9:04 ` Bastian Stender
@ 2017-11-15 9:06 ` Viresh Kumar
2017-11-15 9:09 ` Bastian Stender
0 siblings, 1 reply; 5+ messages in thread
From: Viresh Kumar @ 2017-11-15 9:06 UTC (permalink / raw)
To: Bastian Stender
Cc: shawnguo, Eduardo Valentin, Zhang Rui, Rafael J . Wysocki,
kernel, linux-pm
On 15-11-17, 10:04, Bastian Stender wrote:
> Yes, I looked how drivers/cpufreq/mediatek-cpufreq.c handles the cooling
> device. So dev_pm_opp_free_cpufreq_table is obviously not needed, but why do
> we need no cpufreq_cooling_unregister call here?
My comment was only for the last line, i.e. dev_pm_opp_free_cpufreq_table(). Of
course we need to use cpufreq_cooling_unregister() as you pointed out.
--
viresh
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] cpufreq: imx6q: add CPU as cooling device
2017-11-15 9:06 ` Viresh Kumar
@ 2017-11-15 9:09 ` Bastian Stender
0 siblings, 0 replies; 5+ messages in thread
From: Bastian Stender @ 2017-11-15 9:09 UTC (permalink / raw)
To: Viresh Kumar
Cc: linux-pm, Rafael J . Wysocki, Eduardo Valentin, kernel,
Zhang Rui, shawnguo
On 11/15/2017 10:06 AM, Viresh Kumar wrote:
> On 15-11-17, 10:04, Bastian Stender wrote:
>> Yes, I looked how drivers/cpufreq/mediatek-cpufreq.c handles the cooling
>> device. So dev_pm_opp_free_cpufreq_table is obviously not needed, but why do
>> we need no cpufreq_cooling_unregister call here?
>
> My comment was only for the last line, i.e. dev_pm_opp_free_cpufreq_table(). Of
> course we need to use cpufreq_cooling_unregister() as you pointed out.
Alright.
Regards,
Bastian
--
Pengutronix e.K.
Industrial Linux Solutions
http://www.pengutronix.de/
Peiner Str. 6-8, 31137 Hildesheim, Germany
Amtsgericht Hildesheim, HRA 2686
^ permalink raw reply [flat|nested] 5+ messages in thread
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2017-11-14 13:51 [PATCH] cpufreq: imx6q: add CPU as cooling device Bastian Stender
2017-11-15 4:59 ` Viresh Kumar
2017-11-15 9:04 ` Bastian Stender
2017-11-15 9:06 ` Viresh Kumar
2017-11-15 9:09 ` Bastian Stender
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